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Heating, ventilation, and air conditioning

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From Wikipedia, the free encyclopedia

Rooftop HVAC unit with view of fresh-air intake vent

Ventilation duct with outlet diffuser vent. These are installed throughout a building to move air in or out of rooms. In the middle is a damper to open and close the vent to allow more or less air to enter the space.

The control circuit in a household HVAC installation. The wires connecting to the blue terminal block on the upper-right of the board lead to the thermostat. The fan enclosure is directly behind the board, and the filters can be seen at the top. The safety interlock switch is at the bottom left. In the lower middle is the capacitor.

Heating, ventilation, and air conditioning (HVAC) is the use of various technologies to control the temperature, humidity, and purity of the air in an enclosed space. Its goal is to provide thermal comfort and acceptable indoor air quality. HVAC system design is a subdiscipline of mechanical engineering, based on the principles of thermodynamics, fluid mechanics, and heat transfer. "Refrigeration" is sometimes added to the field's abbreviation as HVAC&R or HVACR, or "ventilation" is dropped, as in HACR (as in the designation of HACR-rated circuit breakers).

HVAC is an important part of residential structures such as single family homes, apartment buildings, hotels, and senior living facilities; medium to large industrial and office buildings such as skyscrapers and hospitals; vehicles such as cars, trains, airplanes, ships and submarines; and in marine environments, where safe and healthy building conditions are regulated with respect to temperature and humidity, using fresh air from outdoors.

Ventilating or ventilation (the "V" in HVAC) is the process of exchanging or replacing air in any space to provide high indoor air quality which involves temperature control, oxygen replenishment, and removal of moisture, odors, smoke, heat, dust, airborne bacteria, carbon dioxide, and other gases. Ventilation removes unpleasant smells and excessive moisture, introduces outside air, keeps interior building air circulating, and prevents stagnation of the interior air. Methods for ventilating a building are divided into mechanical/forced and natural types.^[1]

Overview[edit]

The three major functions of heating, ventilation, and air conditioning are interrelated, especially with the need to provide thermal comfort and acceptable indoor air quality within reasonable installation, operation, and maintenance costs. HVAC systems can be used in both domestic and commercial environments. HVAC systems can provide ventilation, and maintain pressure relationships between spaces. The means of air delivery and removal from spaces is known as room air distribution.^[2]

Individual systems[edit]

See also: HVAC control system

In modern buildings, the design, installation, and control systems of these functions are integrated into one or more HVAC systems. For very small buildings, contractors normally estimate the capacity and type of system needed and then design the system, selecting the appropriate refrigerant and various components needed. For larger buildings, building service designers, mechanical engineers, or building services engineers analyze, design, and specify the HVAC systems. Specialty mechanical contractors and suppliers then fabricate, install and commission the systems. Building permits and code-compliance inspections of the installations are normally required for all sizes of buildings

District networks[edit]

Although HVAC is executed in individual buildings or other enclosed spaces (like NORAD's underground headquarters), the equipment involved is in some cases an extension of a larger district heating (DH) or district cooling (DC) network, or a combined DHC network. In such cases, the operating and maintenance aspects are simplified and metering becomes necessary to bill for the energy that is consumed, and in some cases energy that is returned to the larger system. For example, at a given time one building may be utilizing chilled water for air conditioning and the warm water it returns may be used in another building for heating, or for the overall heating-portion of the DHC network (likely with energy added to boost the temperature).^[3][4][5]

Basing HVAC on a larger network helps provide an economy of scale that is often not possible for individual buildings, for utilizing renewable energy sources such as solar heat,^[6][7][8] winter's cold,^[9][10] the cooling potential in some places of lakes or seawater for free cooling, and the enabling function of seasonal thermal energy storage. By utilizing natural sources that can be used for HVAC systems it can make a huge difference for the environment and help expand the knowledge of using different methods.

History[edit]

See also: Air conditioning § History

HVAC is based on inventions and discoveries made by Nikolay Lvov, Michael Faraday, Rolla C. Carpenter, Willis Carrier, Edwin Ruud, Reuben Trane, James Joule, William Rankine, Sadi Carnot, Alice Parker and many others.^[11]

Multiple inventions within this time frame preceded the beginnings of the first comfort air conditioning system, which was designed in 1902 by Alfred Wolff (Cooper, 2003) for the New York Stock Exchange, while Willis Carrier equipped the Sacketts-Wilhems Printing Company with the process AC unit the same year. Coyne College was the first school to offer HVAC training in 1899.^[12] The first residential AC was installed by 1914, and by the 1950s there was "widespread adoption of residential AC".^[13]

The invention of the components of HVAC systems went hand-in-hand with the Industrial Revolution, and new methods of modernization, higher efficiency, and system control are constantly being introduced by companies and inventors worldwide.

Heating[edit]

"Heater" redirects here. For other uses, see Heater (disambiguation).

Main article: Central heating

Heaters are appliances whose purpose is to generate heat (i.e. warmth) for the building. This can be done via central heating. Such a system contains a boiler, furnace, or heat pump to heat water, steam, or air in a central location such as a furnace room in a home, or a mechanical room in a large building. The heat can be transferred by convection, conduction, or radiation. Space heaters are used to heat single rooms and only consist of a single unit.

Generation[edit]

Central heating unit

Heaters exist for various types of fuel, including solid fuels, liquids, and gases. Another type of heat source is electricity, normally heating ribbons composed of high resistance wire (see Nichrome). This principle is also used for baseboard heaters and portable heaters. Electrical heaters are often used as backup or supplemental heat for heat pump systems.

The heat pump gained popularity in the 1950s in Japan and the United States.^[14] Heat pumps can extract heat from various sources, such as environmental air, exhaust air from a building, or from the ground. Heat pumps transfer heat from outside the structure into the air inside. Initially, heat pump HVAC systems were only used in moderate climates, but with improvements in low temperature operation and reduced loads due to more efficient homes, they are increasing in popularity in cooler climates. They can also operate in reverse to cool an interior.

Distribution[edit]

Water/steam[edit]

In the case of heated water or steam, piping is used to transport the heat to the rooms. Most modern hot water boiler heating systems have a circulator, which is a pump, to move hot water through the distribution system (as opposed to older gravity-fed systems). The heat can be transferred to the surrounding air using radiators, hot water coils (hydro-air), or other heat exchangers. The radiators may be mounted on walls or installed within the floor to produce floor heat.

The use of water as the heat transfer medium is known as hydronics. The heated water can also supply an auxiliary heat exchanger to supply hot water for bathing and washing.

Air[edit]

Main articles: Room air distribution and Underfloor air distribution

Warm air systems distribute the heated air through ductwork systems of supply and return air through metal or fiberglass ducts. Many systems use the same ducts to distribute air cooled by an evaporator coil for air conditioning. The air supply is normally filtered through air filters^{[dubious – discuss]} to remove dust and pollen particles.^[15]

Dangers[edit]

The use of furnaces, space heaters, and boilers as a method of indoor heating could result in incomplete combustion and the emission of carbon monoxide, nitrogen oxides, formaldehyde, volatile organic compounds, and other combustion byproducts. Incomplete combustion occurs when there is insufficient oxygen; the inputs are fuels containing various contaminants and the outputs are harmful byproducts, most dangerously carbon monoxide, which is a tasteless and odorless gas with serious adverse health effects.^[16]

Without proper ventilation, carbon monoxide can be lethal at concentrations of 1000 ppm (0.1%). However, at several hundred ppm, carbon monoxide exposure induces headaches, fatigue, nausea, and vomiting. Carbon monoxide binds with hemoglobin in the blood, forming carboxyhemoglobin, reducing the blood's ability to transport oxygen. The primary health concerns associated with carbon monoxide exposure are its cardiovascular and neurobehavioral effects. Carbon monoxide can cause atherosclerosis (the hardening of arteries) and can also trigger heart attacks. Neurologically, carbon monoxide exposure reduces hand to eye coordination, vigilance, and continuous performance. It can also affect time discrimination.^[17]

Ventilation[edit]

Main article: Ventilation (architecture)

See also: Duct (flow)

Ventilation is the process of changing or replacing air in any space to control the temperature or remove any combination of moisture, odors, smoke, heat, dust, airborne bacteria, or carbon dioxide, and to replenish oxygen. It plays a critical role in maintaining a healthy indoor environment by preventing the buildup of harmful pollutants and ensuring the circulation of fresh air. Different methods, such as natural ventilation through windows and mechanical ventilation systems, can be used depending on the building design and air quality needs. Ventilation often refers to the intentional delivery of the outside air to the building indoor space. It is one of the most important factors for maintaining acceptable indoor air quality in buildings.

Although ventilation is an integral component of maintaining good indoor air quality, it may not be satisfactory alone.^[18] A clear understanding of both indoor and outdoor air quality parameters is needed to improve the performance of ventilation in terms of ...^[19] In scenarios where outdoor pollution would deteriorate indoor air quality, other treatment devices such as filtration may also be necessary.^[20]

Methods for ventilating a building may be divided into mechanical/forced and natural types.^[21]

Mechanical or forced[edit]

Further information: Ventilation (architecture) § Mechanical systems

HVAC ventilation exhaust for a 12-story building

An axial belt-drive exhaust fan serving an underground car park. This exhaust fan's operation is interlocked with the concentration of contaminants emitted by internal combustion engines.

Mechanical, or forced, ventilation is provided by an air handler (AHU) and used to control indoor air quality. Excess humidity, odors, and contaminants can often be controlled via dilution or replacement with outside air. However, in humid climates more energy is required to remove excess moisture from ventilation air.

Kitchens and bathrooms typically have mechanical exhausts to control odors and sometimes humidity. Factors in the design of such systems include the flow rate (which is a function of the fan speed and exhaust vent size) and noise level. Direct drive fans are available for many applications and can reduce maintenance needs.

In summer, ceiling fans and table/floor fans circulate air within a room for the purpose of reducing the perceived temperature by increasing evaporation of perspiration on the skin of the occupants. Because hot air rises, ceiling fans may be used to keep a room warmer in the winter by circulating the warm stratified air from the ceiling to the floor.

Passive[edit]

Main article: Passive ventilation

Ventilation on the downdraught system, by impulsion, or the 'plenum' principle, applied to schoolrooms (1899)

Natural ventilation is the ventilation of a building with outside air without using fans or other mechanical systems. It can be via operable windows, louvers, or trickle vents when spaces are small and the architecture permits. ASHRAE defined Natural ventilation as the flow of air through open windows, doors, grilles, and other planned building envelope penetrations, and as being driven by natural and/or artificially produced pressure differentials.^[1]

Natural ventilation strategies also include cross ventilation, which relies on wind pressure differences on opposite sides of a building. By strategically placing openings, such as windows or vents, on opposing walls, air is channeled through the space to enhance cooling and ventilation. Cross ventilation is most effective when there are clear, unobstructed paths for airflow within the building.

In more complex schemes, warm air is allowed to rise and flow out high building openings to the outside (stack effect), causing cool outside air to be drawn into low building openings. Natural ventilation schemes can use very little energy, but care must be taken to ensure comfort. In warm or humid climates, maintaining thermal comfort solely via natural ventilation might not be possible. Air conditioning systems are used, either as backups or supplements. Air-side economizers also use outside air to condition spaces, but do so using fans, ducts, dampers, and control systems to introduce and distribute cool outdoor air when appropriate.

An important component of natural ventilation is air change rate or air changes per hour: the hourly rate of ventilation divided by the volume of the space. For example, six air changes per hour means an amount of new air, equal to the volume of the space, is added every ten minutes. For human comfort, a minimum of four air changes per hour is typical, though warehouses might have only two. Too high of an air change rate may be uncomfortable, akin to a wind tunnel which has thousands of changes per hour. The highest air change rates are for crowded spaces, bars, night clubs, commercial kitchens at around 30 to 50 air changes per hour.^[22]

Room pressure can be either positive or negative with respect to outside the room. Positive pressure occurs when there is more air being supplied than exhausted, and is common to reduce the infiltration of outside contaminants.^[23]

Airborne diseases[edit]

Natural ventilation ^[24] is a key factor in reducing the spread of airborne illnesses such as tuberculosis, the common cold, influenza, meningitis or COVID-19. Opening doors and windows are good ways to maximize natural ventilation, which would make the risk of airborne contagion much lower than with costly and maintenance-requiring mechanical systems. Old-fashioned clinical areas with high ceilings and large windows provide the greatest protection. Natural ventilation costs little and is maintenance free, and is particularly suited to limited-resource settings and tropical climates, where the burden of TB and institutional TB transmission is highest. In settings where respiratory isolation is difficult and climate permits, windows and doors should be opened to reduce the risk of airborne contagion. Natural ventilation requires little maintenance and is inexpensive.^[25]

Natural ventilation is not practical in much of the infrastructure because of climate. This means that the facilities need to have effective mechanical ventilation systems and or use Ceiling Level UV or FAR UV ventilation systems.

Alpha Black Edition - Sirair Air conditioner with UVC (Ultraviolet Germicidal Irradiation)

Ventilation is measured in terms of Air Changes Per Hour (ACH). As of 2023, the CDC recommends that all spaces have a minimum of 5 ACH.^[26] For hospital rooms with airborne contagions the CDC recommends a minimum of 12 ACH.^[27] The challenges in facility ventilation are public unawareness,^[28][29] ineffective government oversight, poor building codes that are based on comfort levels, poor system operations, poor maintenance, and lack of transparency.^[30]

UVC or Ultraviolet Germicidal Irradiation is a function used in modern air conditioners which reduces airborne viruses, bacteria, and fungi, through the use of a built-in LED UV light that emits a gentle glow across the evaporator. As the cross-flow fan circulates the room air, any viruses are guided through the sterilization module’s irradiation range, rendering them instantly inactive.^[31]

Air conditioning[edit]

Main article: Air conditioning

An air conditioning system, or a standalone air conditioner, provides cooling and/or humidity control for all or part of a building. Air conditioned buildings often have sealed windows, because open windows would work against the system intended to maintain constant indoor air conditions. Outside, fresh air is generally drawn into the system by a vent into a mix air chamber for mixing with the space return air. Then the mixture air enters an indoor or outdoor heat exchanger section where the air is to be cooled down, then be guided to the space creating positive air pressure. The percentage of return air made up of fresh air can usually be manipulated by adjusting the opening of this vent. Typical fresh air intake is about 10% of the total supply air.^{[citation needed]}

Air conditioning and refrigeration are provided through the removal of heat. Heat can be removed through radiation, convection, or conduction. The heat transfer medium is a refrigeration system, such as water, air, ice, and chemicals are referred to as refrigerants. A refrigerant is employed either in a heat pump system in which a compressor is used to drive thermodynamic refrigeration cycle, or in a free cooling system that uses pumps to circulate a cool refrigerant (typically water or a glycol mix).

It is imperative that the air conditioning horsepower is sufficient for the area being cooled. Underpowered air conditioning systems will lead to power wastage and inefficient usage. Adequate horsepower is required for any air conditioner installed.

Refrigeration cycle[edit]

Main article: Heat pump and refrigeration cycle

A simple stylized diagram of the refrigeration cycle: 1) condensing coil, 2) expansion valve, 3) evaporating coil, 4) compressor

The refrigeration cycle uses four essential elements to cool, which are compressor, condenser, metering device, and evaporator.

• At the inlet of a compressor, the refrigerant inside the system is in a low pressure, low temperature, gaseous state. The compressor pumps the refrigerant gas up to high pressure and temperature.
• From there it enters a heat exchanger (sometimes called a condensing coil or condenser) where it loses heat to the outside, cools, and condenses into its liquid phase.
• An expansion valve (also called metering device) regulates the refrigerant liquid to flow at the proper rate.
• The liquid refrigerant is returned to another heat exchanger where it is allowed to evaporate, hence the heat exchanger is often called an evaporating coil or evaporator. As the liquid refrigerant evaporates it absorbs heat from the inside air, returns to the compressor, and repeats the cycle. In the process, heat is absorbed from indoors and transferred outdoors, resulting in cooling of the building.

In variable climates, the system may include a reversing valve that switches from heating in winter to cooling in summer. By reversing the flow of refrigerant, the heat pump refrigeration cycle is changed from cooling to heating or vice versa. This allows a facility to be heated and cooled by a single piece of equipment by the same means, and with the same hardware.

Free cooling[edit]

Main article: Free cooling

Free cooling systems can have very high efficiencies, and are sometimes combined with seasonal thermal energy storage so that the cold of winter can be used for summer air conditioning. Common storage mediums are deep aquifers or a natural underground rock mass accessed via a cluster of small-diameter, heat-exchanger-equipped boreholes. Some systems with small storages are hybrids, using free cooling early in the cooling season, and later employing a heat pump to chill the circulation coming from the storage. The heat pump is added-in because the storage acts as a heat sink when the system is in cooling (as opposed to charging) mode, causing the temperature to gradually increase during the cooling season.

Some systems include an "economizer mode", which is sometimes called a "free-cooling mode". When economizing, the control system will open (fully or partially) the outside air damper and close (fully or partially) the return air damper. This will cause fresh, outside air to be supplied to the system. When the outside air is cooler than the demanded cool air, this will allow the demand to be met without using the mechanical supply of cooling (typically chilled water or a direct expansion "DX" unit), thus saving energy. The control system can compare the temperature of the outside air vs. return air, or it can compare the enthalpy of the air, as is frequently done in climates where humidity is more of an issue. In both cases, the outside air must be less energetic than the return air for the system to enter the economizer mode.

Packaged split system[edit]

Central, "all-air" air-conditioning systems (or package systems) with a combined outdoor condenser/evaporator unit are often installed in North American residences, offices, and public buildings, but are difficult to retrofit (install in a building that was not designed to receive it) because of the bulky air ducts required.^[32] (Minisplit ductless systems are used in these situations.) Outside of North America, packaged systems are only used in limited applications involving large indoor space such as stadiums, theatres or exhibition halls.

An alternative to packaged systems is the use of separate indoor and outdoor coils in split systems. Split systems are preferred and widely used worldwide except in North America. In North America, split systems are most often seen in residential applications, but they are gaining popularity in small commercial buildings. Split systems are used where ductwork is not feasible or where the space conditioning efficiency is of prime concern.^[33] The benefits of ductless air conditioning systems include easy installation, no ductwork, greater zonal control, flexibility of control, and quiet operation.^[34] In space conditioning, the duct losses can account for 30% of energy consumption.^[35] The use of minisplits can result in energy savings in space conditioning as there are no losses associated with ducting.

With the split system, the evaporator coil is connected to a remote condenser unit using refrigerant piping between an indoor and outdoor unit instead of ducting air directly from the outdoor unit. Indoor units with directional vents mount onto walls, suspended from ceilings, or fit into the ceiling. Other indoor units mount inside the ceiling cavity so that short lengths of duct handle air from the indoor unit to vents or diffusers around the rooms.

Split systems are more efficient and the footprint is typically smaller than the package systems. On the other hand, package systems tend to have a slightly lower indoor noise level compared to split systems since the fan motor is located outside.

Dehumidification[edit]

Dehumidification (air drying) in an air conditioning system is provided by the evaporator. Since the evaporator operates at a temperature below the dew point, moisture in the air condenses on the evaporator coil tubes. This moisture is collected at the bottom of the evaporator in a pan and removed by piping to a central drain or onto the ground outside.

A dehumidifier is an air-conditioner-like device that controls the humidity of a room or building. It is often employed in basements that have a higher relative humidity because of their lower temperature (and propensity for damp floors and walls). In food retailing establishments, large open chiller cabinets are highly effective at dehumidifying the internal air. Conversely, a humidifier increases the humidity of a building.

The HVAC components that dehumidify the ventilation air deserve careful attention because outdoor air constitutes most of the annual humidity load for nearly all buildings.^[36]

Humidification[edit]

Main article: Humidifier

Maintenance[edit]

All modern air conditioning systems, even small window package units, are equipped with internal air filters.^{[citation needed]} These are generally of a lightweight gauze-like material, and must be replaced or washed as conditions warrant. For example, a building in a high dust environment, or a home with furry pets, will need to have the filters changed more often than buildings without these dirt loads. Failure to replace these filters as needed will contribute to a lower heat exchange rate, resulting in wasted energy, shortened equipment life, and higher energy bills; low air flow can result in iced-over evaporator coils, which can completely stop airflow. Additionally, very dirty or plugged filters can cause overheating during a heating cycle, which can result in damage to the system or even fire.

Because an air conditioner moves heat between the indoor coil and the outdoor coil, both must be kept clean. This means that, in addition to replacing the air filter at the evaporator coil, it is also necessary to regularly clean the condenser coil. Failure to keep the condenser clean will eventually result in harm to the compressor because the condenser coil is responsible for discharging both the indoor heat (as picked up by the evaporator) and the heat generated by the electric motor driving the compressor.

Energy efficiency[edit]

HVAC is significantly responsible for promoting energy efficiency of buildings as the building sector consumes the largest percentage of global energy.^[37] Since the 1980s, manufacturers of HVAC equipment have been making an effort to make the systems they manufacture more efficient. This was originally driven by rising energy costs, and has more recently been driven by increased awareness of environmental issues. Additionally, improvements to the HVAC system efficiency can also help increase occupant health and productivity.^[38] In the US, the EPA has imposed tighter restrictions over the years. There are several methods for making HVAC systems more efficient.

Heating energy[edit]

In the past, water heating was more efficient for heating buildings and was the standard in the United States. Today, forced air systems can double for air conditioning and are more popular.

Some benefits of forced air systems, which are now widely used in churches, schools, and high-end residences, are

• Better air conditioning effects
• Energy savings of up to 15–20%
• Even conditioning^{[citation needed]}

A drawback is the installation cost, which can be slightly higher than traditional HVAC systems.

Energy efficiency can be improved even more in central heating systems by introducing zoned heating. This allows a more granular application of heat, similar to non-central heating systems. Zones are controlled by multiple thermostats. In water heating systems the thermostats control zone valves, and in forced air systems they control zone dampers inside the vents which selectively block the flow of air. In this case, the control system is very critical to maintaining a proper temperature.

Forecasting is another method of controlling building heating by calculating the demand for heating energy that should be supplied to the building in each time unit.

Ground source heat pump[edit]

Main article: Geothermal heat pump

Ground source, or geothermal, heat pumps are similar to ordinary heat pumps, but instead of transferring heat to or from outside air, they rely on the stable, even temperature of the earth to provide heating and air conditioning. Many regions experience seasonal temperature extremes, which would require large-capacity heating and cooling equipment to heat or cool buildings. For example, a conventional heat pump system used to heat a building in Montana's −57 °C (−70 °F) low temperature or cool a building in the highest temperature ever recorded in the US—57 °C (134 °F) in Death Valley, California, in 1913 would require a large amount of energy due to the extreme difference between inside and outside air temperatures. A metre below the earth's surface, however, the ground remains at a relatively constant temperature. Utilizing this large source of relatively moderate temperature earth, a heating or cooling system's capacity can often be significantly reduced. Although ground temperatures vary according to latitude, at 1.8 metres (6 ft) underground, temperatures generally only range from 7 to 24 °C (45 to 75 °F).

Solar air conditioning[edit]

Main article: Solar air conditioning

Photovoltaic solar panels offer a new way to potentially decrease the operating cost of air conditioning. Traditional air conditioners run using alternating current, and hence, any direct-current solar power needs to be inverted to be compatible with these units. New variable-speed DC-motor units allow solar power to more easily run them since this conversion is unnecessary, and since the motors are tolerant of voltage fluctuations associated with variance in supplied solar power (e.g., due to cloud cover).

Ventilation energy recovery[edit]

Energy recovery systems sometimes utilize heat recovery ventilation or energy recovery ventilation systems that employ heat exchangers or enthalpy wheels to recover sensible or latent heat from exhausted air. This is done by transfer of energy from the stale air inside the home to the incoming fresh air from outside.

Air conditioning energy[edit]

The performance of vapor compression refrigeration cycles is limited by thermodynamics.^[39] These air conditioning and heat pump devices move heat rather than convert it from one form to another, so thermal efficiencies do not appropriately describe the performance of these devices. The Coefficient of performance (COP) measures performance, but this dimensionless measure has not been adopted. Instead, the Energy Efficiency Ratio (EER) has traditionally been used to characterize the performance of many HVAC systems. EER is the Energy Efficiency Ratio based on a 35 °C (95 °F) outdoor temperature. To more accurately describe the performance of air conditioning equipment over a typical cooling season a modified version of the EER, the Seasonal Energy Efficiency Ratio (SEER), or in Europe the ESEER, is used. SEER ratings are based on seasonal temperature averages instead of a constant 35 °C (95 °F) outdoor temperature. The current industry minimum SEER rating is 14 SEER. Engineers have pointed out some areas where efficiency of the existing hardware could be improved. For example, the fan blades used to move the air are usually stamped from sheet metal, an economical method of manufacture, but as a result they are not aerodynamically efficient. A well-designed blade could reduce the electrical power required to move the air by a third.^[40]

Demand-controlled kitchen ventilation[edit]

Main article: Demand controlled ventilation

Demand-controlled kitchen ventilation (DCKV) is a building controls approach to controlling the volume of kitchen exhaust and supply air in response to the actual cooking loads in a commercial kitchen. Traditional commercial kitchen ventilation systems operate at 100% fan speed independent of the volume of cooking activity and DCKV technology changes that to provide significant fan energy and conditioned air savings. By deploying smart sensing technology, both the exhaust and supply fans can be controlled to capitalize on the affinity laws for motor energy savings, reduce makeup air heating and cooling energy, increasing safety, and reducing ambient kitchen noise levels.^[41]

Air filtration and cleaning[edit]

Main article: Air filter

Air handling unit, used for heating, cooling, and filtering the air

Air cleaning and filtration removes particles, contaminants, vapors and gases from the air. The filtered and cleaned air then is used in heating, ventilation, and air conditioning. Air cleaning and filtration should be taken in account when protecting our building environments.^[42] If present, contaminants can come out from the HVAC systems if not removed or filtered properly.

Clean air delivery rate (CADR) is the amount of clean air an air cleaner provides to a room or space. When determining CADR, the amount of airflow in a space is taken into account. For example, an air cleaner with a flow rate of 30 cubic metres (1,000 cu ft) per minute and an efficiency of 50% has a CADR of 15 cubic metres (500 cu ft) per minute. Along with CADR, filtration performance is very important when it comes to the air in our indoor environment. This depends on the size of the particle or fiber, the filter packing density and depth, and the airflow rate.^[42]

Circulation of harmful substances[edit]

Poorly maintained air conditioners/ventilation systems can harbor mold, bacteria, and other contaminants, which are then circulated throughout indoor spaces, contributing to ...^[43]

Industry and standards[edit]

The HVAC industry is a worldwide enterprise, with roles including operation and maintenance, system design and construction, equipment manufacturing and sales, and in education and research. The HVAC industry was historically regulated by the manufacturers of HVAC equipment, but regulating and standards organizations such as HARDI (Heating, Air-conditioning and Refrigeration Distributors International), ASHRAE, SMACNA, ACCA (Air Conditioning Contractors of America), Uniform Mechanical Code, International Mechanical Code, and AMCA have been established to support the industry and encourage high standards and achievement. (UL as an omnibus agency is not specific to the HVAC industry.)

The starting point in carrying out an estimate both for cooling and heating depends on the exterior climate and interior specified conditions. However, before taking up the heat load calculation, it is necessary to find fresh air requirements for each area in detail, as pressurization is an important consideration.

International[edit]

ISO 16813:2006 is one of the ISO building environment standards.^[44] It establishes the general principles of building environment design. It takes into account the need to provide a healthy indoor environment for the occupants as well as the need to protect the environment for future generations and promote collaboration among the various parties involved in building environmental design for sustainability. ISO16813 is applicable to new construction and the retrofit of existing buildings.^[45]

The building environmental design standard aims to:^[45]

• provide the constraints concerning sustainability issues from the initial stage of the design process, with building and plant life cycle to be considered together with owning and operating costs from the beginning of the design process;
• assess the proposed design with rational criteria for indoor air quality, thermal comfort, acoustical comfort, visual comfort, energy efficiency, and HVAC system controls at every stage of the design process;
• iterate decisions and evaluations of the design throughout the design process.

United States[edit]

Licensing[edit]

Main article: Section 608 EPA Certification

In the United States, federal licensure is generally handled by EPA certified (for installation and service of HVAC devices).

Many U.S. states have licensing for boiler operation. Some of these are listed as follows:

• Arkansas^[46]
• Georgia^[47]
• Michigan^[48]
• Minnesota^[49]
• Montana^[50]
• New Jersey^[51]
• North Dakota^[52]
• Ohio^[53]
• Oklahoma^[54]
• Oregon^[55]

Finally, some U.S. cities may have additional labor laws that apply to HVAC professionals.

Societies[edit]

See also: American Society of Heating, Refrigerating and Air-Conditioning Engineers

See also: Air Conditioning, Heating and Refrigeration Institute

Many HVAC engineers are members of the American Society of Heating, Refrigerating, and Air-Conditioning Engineers (ASHRAE). ASHRAE regularly organizes two annual technical committees and publishes recognized standards for HVAC design, which are updated every four years.^[56]

Another popular society is AHRI, which provides regular information on new refrigeration technology, and publishes relevant standards and codes.

Codes[edit]

Codes such as the UMC and IMC do include much detail on installation requirements, however. Other useful reference materials include items from SMACNA, ACGIH, and technical trade journals.

American design standards are legislated in the Uniform Mechanical Code or International Mechanical Code. In certain states, counties, or cities, either of these codes may be adopted and amended via various legislative processes. These codes are updated and published by the International Association of Plumbing and Mechanical Officials (IAPMO) or the International Code Council (ICC) respectively, on a 3-year code development cycle. Typically, local building permit departments are charged with enforcement of these standards on private and certain public properties.

Technicians[edit]

An HVAC technician is a tradesman who specializes in heating, ventilation, air conditioning, and refrigeration. HVAC technicians in the US can receive training through formal training institutions, where most earn associate degrees. Training for HVAC technicians includes classroom lectures and hands-on tasks, and can be followed by an apprenticeship wherein the recent graduate works alongside a professional HVAC technician for a temporary period.^[57] HVAC techs who have been trained can also be certified in areas such as air conditioning, heat pumps, gas heating, and commercial refrigeration.

United Kingdom[edit]

The Chartered Institution of Building Services Engineers is a body that covers the essential Service (systems architecture) that allow buildings to operate. It includes the electrotechnical, heating, ventilating, air conditioning, refrigeration and plumbing industries. To train as a building services engineer, the academic requirements are GCSEs (A-C) / Standard Grades (1-3) in Maths and Science, which are important in measurements, planning and theory. Employers will often want a degree in a branch of engineering, such as building environment engineering, electrical engineering or mechanical engineering. To become a full member of CIBSE, and so also to be registered by the Engineering Council UK as a chartered engineer, engineers must also attain an Honours Degree and a master's degree in a relevant engineering subject.^{[citation needed]} CIBSE publishes several guides to HVAC design relevant to the UK market, and also the Republic of Ireland, Australia, New Zealand and Hong Kong. These guides include various recommended design criteria and standards, some of which are cited within the UK building regulations, and therefore form a legislative requirement for major building services works. The main guides are:

• Guide A: Environmental Design
• Guide B: Heating, Ventilating, Air Conditioning and Refrigeration
• Guide C: Reference Data
• Guide D: Transportation systems in Buildings
• Guide E: Fire Safety Engineering
• Guide F: Energy Efficiency in Buildings
• Guide G: Public Health Engineering
• Guide H: Building Control Systems
• Guide J: Weather, Solar and Illuminance Data
• Guide K: Electricity in Buildings
• Guide L: Sustainability
• Guide M: Maintenance Engineering and Management

Within the construction sector, it is the job of the building services engineer to design and oversee the installation and maintenance of the essential services such as gas, electricity, water, heating and lighting, as well as many others. These all help to make buildings comfortable and healthy places to live and work in. Building Services is part of a sector that has over 51,000 businesses and employs represents 2–3% of the GDP.

Australia[edit]

The Air Conditioning and Mechanical Contractors Association of Australia (AMCA), Australian Institute of Refrigeration, Air Conditioning and Heating (AIRAH), Australian Refrigeration Mechanical Association and CIBSE are responsible.

Asia[edit]

Asian architectural temperature-control have different priorities than European methods. For example, Asian heating traditionally focuses on maintaining temperatures of objects such as the floor or furnishings such as Kotatsu tables and directly warming people, as opposed to the Western focus, in modern periods, on designing air systems.

Philippines[edit]

The Philippine Society of Ventilating, Air Conditioning and Refrigerating Engineers (PSVARE) along with Philippine Society of Mechanical Engineers (PSME) govern on the codes and standards for HVAC / MVAC (MVAC means "mechanical ventilation and air conditioning") in the Philippines.

India[edit]

The Indian Society of Heating, Refrigerating and Air Conditioning Engineers (ISHRAE) was established to promote the HVAC industry in India. ISHRAE is an associate of ASHRAE. ISHRAE was founded at New Delhi^[58] in 1981 and a chapter was started in Bangalore in 1989. Between 1989 & 1993, ISHRAE chapters were formed in all major cities in India.^{[citation needed]}

See also[edit]

• Air speed (HVAC)
• Architectural engineering
• ASHRAE Handbook
• Auxiliary power unit
• Cleanroom
• Electric heating
• Fan coil unit
• Glossary of HVAC terms
• Head-end power
• Hotel electric power
• Mechanical engineering
• Outdoor wood-fired boiler
• Radiant cooling
• Sick building syndrome
• Uniform Codes
• Uniform Mechanical Code
• Ventilation (architecture)
• World Refrigeration Day
• Wrightsoft

Farmers Branch, Texas

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Coordinates: 32°55′38″N 96°51′50″W

From Wikipedia, the free encyclopedia

Farmers Branch, officially the City of Farmers Branch, is a city in Dallas County, Texas, United States. It is an inner-ring suburb of Dallas and is part of the Dallas–Fort Worth metroplex. Its population was 35,991 at the 2020 census.^[8]

History[edit]

Historic railroad depot, built 1877

The community was first settled in the early 1850s. In 1842, Thomas Keenan, Isaac B. Webb, and William Cochran received original land grants in the area. By 1843, a community called Mustang Branch had been established. Mr. Cochran later changed the name to Farmers Branch to reflect the area's rich soil and farmland.^[9] Farmers Branch was the first location of the Texan Land and Emigration Company (or Peters Colony) in 1845. This made the community one of the best-known places in Dallas County during the 1840s because of its advertising throughout Europe and the United States. Baptist minister William Bowles opened a blacksmith shop and gristmill in 1845. On May 5, 1845, Isaac B. Webb donated land for Webb's Chapel Methodist Church, the first formal place of worship in Dallas County.^[9][10] A school was established in the church one year later. Webb became the first postmaster at the Farmers Branch post office, which opened on January 5, 1848. It continued to function until its closure in 1866. The post office reopened in 1875.^[11] To assure that railroads would eventually pass through Farmers Branch, prominent early settler Samuel Gilbert and others sold right-of-way through their land in 1874.^[10] Around three to four years later, the Dallas and Wichita Railway completed a track from Dallas—through Farmers Branch—to Lewisville. It was absorbed by the Missouri–Kansas–Texas Railroad in 1881. The community had a population around 100 by 1890, with several businesses. The population had grown to 300 during the early 1900s.^[9] A brick school building was constructed in 1916. The number of people living in the community remained stable until after World War II.

Farmers Branch was incorporated as a city after an election was held on February 23, 1946.^[10] William F. (Bill) Dodson was elected as the city's first mayor. The implementation of city services began immediately after incorporation. In the 1950 census, Farmers Branch had a population of 915. In 1956, a home-rule charter was approved that adopted a council-manager form of government. The rapid growth of the city during the 1950s was made apparent in the 1960 census, which recorded a total of 13,441 residents, a 1,369% increase over the 1950 figure. Most of the new residents commuted to nearby Dallas for employment.^[11] The population topped 27,000 by 1970. A variety of manufacturers producing items such as steel products, concrete, asphalt, cosmetics, and food products was operating in the city. The number of residents declined to 24,863 in 1980 and 24,250 in 1990. The falling population was offset, however, by the wide variety of businesses located in the city. Farmers Branch is home to a large number of corporations that have attained frontage along Interstate 635, the Dallas North Tollway, and Interstate 35E. Its Dallas North Tollway segment is part of the Platinum Corridor, and its land along Interstate 635 is an extension of the lengthy Irving Prairie office park. By 2000, the city's population had grown to 27,508.^[9] and by 2020 the city's population had grown to 35,991.^[8]

Geography[edit]

According to the United States Census Bureau, the city has a total area of 11.79 sq mi (30.54 km²) with only 0.08% (0.09 sq mi - 0.24 km2) covered by water.^[8]

Demographics[edit]

JP Morgan Chase Bank in Farmers Branch

As of the 2020 United States census, there were 35,991 people, 16,015 households, and 10,119 families residing in the city.

Economy[edit]

According to the city's 2022 Annual Comprehensive Financial Report^[15] the top employers in the city are:

As of 2012, Farmers Branch had 3,500 companies. Celanese Corporation, Eyemart Express, I2 Technologies, OxyChem, and Varsity Brands have their headquarters in Farmers Branch. Maxim Integrated Products has an office in Farmers Branch.^[16] All Smiles Dental Centers formerly had its headquarters in Farmers Branch.^[17][18] Excellence Health Inc. has an office in Farmers Branch that covers the Dallas life sciences cluster.

North Central Texas Council of Governments 2018 estimated total employment for the City of Farmers Branch is 78,393. The report is adjusted by the City of Farmers Branch finance department for businesses closed or moved prior to the reporting year.^[15]

Government[edit]

Politics[edit]

Local government[edit]

According to the city's most recent Comprehensive Annual Financial Report Fund Financial Statements, the city's various funds had $50.0 million in revenues, $64.5 million in expenditures, $33.8 million in total assets, $6.5 million in total liabilities, and $38.2 million in investments.^[20]

The structure of the management and co-ordination of city services is:^[21]

The city has its own police department.

Farmers Branch is a voluntary member of the North Central Texas Council of Governments association, the purpose of which is to co-ordinate individual and collective local governments and facilitate regional solutions, eliminate unnecessary duplication, and enable joint decisions.

Education[edit]

Public school districts[edit]

Residential areas in Farmers Branch are within two school districts.^[37][38]

Most of Farmers Branch is a part of the Carrollton-Farmers Branch Independent School District. Dave Blair Elementary School,^[39] Farmers Branch Elementary School,^[40] Janie Stark Elementary School,^[41] and Nancy H. Strickland Intermediate School (3–5) are in Farmers Branch.^[42] Sections zoned to Strickland for grades 3–5 are zoned to Neil Ray McLaughlin Elementary School (K–2) in Carrollton^[43] Vivian C. Field Middle School is in Farmers Branch and serves almost all of the CFBISD portion.^[44] R. L. Turner High School in Carrollton also serves almost all of CFBISD Farmers Branch.^[45] Residential areas south of Interstate 635 and west of Interstate 35E are zoned to La Villita Elementary School, Barbara Bush Middle School and Ranchview High School in Irving.^[46][47][48] CFBISD's Early College High School, an alternative high school, is on the property of Brookhaven College.^[49]

Dallas Independent School District also serves a small portion of Farmers Branch.^[50] One DISD elementary school, Chapel Hill Preparatory School, known as William L. Cabell Elementary School until its 2018 renaming,^[51] is in Farmers Branch.^[52] Its current name is a reference to the Chapel Hill community; it was renamed since the former namesake, Mayor of Dallas William Lewis Cabell, served in the Confederate States of America.^[53] Other residential portions of DISD Farmers Branch are served by Gooch Elementary.^[54] Residential areas in DISD are zoned to Marsh Middle School and W.T. White High School.^[55][56]

Mayor Tim O'Hare proposed making a new municipal Farmers Branch school district with the portions currently in CFBISD and DISD. In 2011, about 66% of voters decided against the referendum. At the time, the city did not have the 8,000 children required under Texas law as a requirement for forming a new district, so KTVT stated, "Even if the proposal had passed, there would have been little, if anything, the city could have done to move forward".^[57]

Private schools[edit]

Mary Immaculate Catholic School, a part of the Roman Catholic Diocese of Dallas, is in Farmers Branch.^[58] In addition, German International School of Dallas, established in 2009 and serving preschool and elementary school, is in the city limits.^[59]

Colleges and universities[edit]

The Texas Legislature defines all of Dallas County (Farmers Branch included) as in the service area of Dallas College, as well as all of CFBISD.^[60] Brookhaven College of Dallas College is in the Farmers Branch city limits.

Additionally Farmers Branch is home to Dallas Christian College, a four-year Bible college.

Weekend supplementary education[edit]

The Japanese School of Dallas, a supplementary Japanese school, previously had its main office in Farmers Branch.^[50][61] The school conducts its classes at Ted Polk Middle School in Carrollton.^[61] On Monday July 25, 2016 the Japanese Association and the Japanese School offices moved to a new location in Dallas. The classroom location remained the same.^[62]

Transportation[edit]

Farmers Branch was one of fifteen cities to approve services of Dallas Area Rapid Transit in 1983 by levying a 1 cent sales tax. The city currently receives DART bus service, with service to downtown Dallas (by both regular route and express bus), the adjacent suburb of Carrollton, and crosstown routes as well. On December 6, 2010, the city received light rail transit service with a station near the northeast corner of Interstates 635 and 35E on the Green Line, which runs from Pleasant Grove in southeast Dallas through downtown Dallas following I-35E up to Carrollton at Frankford Road.

The city is between Interstate 35E to the west, the Dallas North Tollway on the east, and Interstate 635 to the south.

Sister cities[edit]

Farmers Branch maintains a sister city relationship with Bassetlaw, United Kingdom, and Garbsen, Germany.

Notes[edit]

• ^ Note: the US Census treats Hispanic/Latino as an ethnic category. This table excludes Latinos from the racial categories and assigns them to a separate category. Hispanics/Latinos can be of any race.^[14]

References[edit]

• ^ "City Council". City of Farmers Branch. Retrieved February 18, 2023.
• ^ "City Manager's Office". farmersbranchtx.gov. City of Farmers Branch. Retrieved February 19, 2023.
• ^ "2019 U.S. Gazetteer Files". United States Census Bureau. Retrieved August 7, 2020.
• ^ List of metropolitan statistical areas
• ^ List of United States urban areas
• ^
• Jump up to:
• ^{a b} U.S. Geological Survey Geographic Names Information System: Farmers Branch, Texas
• ^ Combined statistical area
• ^
• Jump up to:
• ^{a b c d e} "US Census Quick Facts for Farmers Branch city, Texas". Census.gov. Retrieved February 18, 2023.
• ^
• Jump up to:
• ^{a b c d} "Farmers Branch, Texas". The Handbook of Texas online. Retrieved September 20, 2009.
• ^
• Jump up to:
• ^{a b c} "History". City Overview. City of Farmers Branch, Texas. Archived from the original on August 21, 2010. Retrieved September 20, 2009.
• ^
• Jump up to:
• ^{a b} "Farmers Branch, Texas". Texas Escapes Online Magazine. Retrieved September 20, 2009.
• ^ "U,S. Census Farmers Branch city, Texas". census.gov. United States Census Bureau. Retrieved February 19, 2023.
• ^ "Explore Census Data". data.census.gov. Retrieved May 22, 2022.
• ^ "About the Hispanic Population and its Origin". www.census.gov. Retrieved May 18, 2022.
• ^
• Jump up to:
• ^{a b} "City of Farmers Branch 2022 ACFR". farmersbranchtx.gov. Retrieved February 4, 2022.
• ^ "Economic Development Archived 2010-02-13 at the Wayback Machine." City of Farmers Branch. Retrieved on September 30, 2012.
• ^ "CORPORATE INTEGRITY AGREEMENT BETWEEN THE OFFICE OF INSPECTOR GENERAL OF THE DEPARTMENT OF HEALTH AND HUMAN SERVICES AND ALL SMILES DENTAL CENTER, INC." (Archive) Office of the Inspector General, United States Department of Health and Human Services. p. 23. Retrieved on September 22, 2012. "All Smiles: Michael S. J. Lozich, Esq. Chief Compliance Officer All Smiles Dental Centers 4901 LBJ Freeway, Suite 300 Dallas, Texas 75244"
• ^ "Sheet No. 23." (Zoning Map) (Archive) City of Farmers Branch. Retrieved on September 23, 2012.
• ^ "Dallas County Election Results".
• ^ City of Farmers Branch 2009 CAFR^{[permanent dead link]} retrieved 2010-11-11
• ^ City of Farmers Branch 2009 CAFR^{[permanent dead link]} retrieved 2010-11-11
• ^
• Jump up to:
• ^{a b c} "City Manager's Office". City of Farmers Branch. Retrieved February 18, 2023.
• ^ "City Secretary". City of Farmers Branch. Retrieved February 18, 2023.
• ^ "Municipal Judge". City of Farmers Branch. Retrieved June 3, 2019.
• ^ "Communications". City of Farmers Branch. Retrieved June 3, 2019.
• ^ "Community Services". City of Farmers Branch. Retrieved June 3, 2019.
• ^ "Planning & Zoning". City of Farmers Branch. Retrieved June 3, 2019.
• ^ "Economic Development & Tourism". City of Farmers Branch. Archived from the original on March 11, 2019. Retrieved June 3, 2019.
• ^ "Finance Department". City of Farmers Branch. Retrieved June 3, 2019.
• ^ "Human Resources". City of Farmers Branch. Retrieved June 3, 2019.
• ^ "Manske Library". City of Farmers Branch. Retrieved June 3, 2019.
• ^ "Fire Department". City of Farmers Branch. Retrieved April 27, 2021.
• ^ "Police Department". City of Farmers Branch. Retrieved June 3, 2019.
• ^ "Parks & Recreation". City of Farmers Branch. Retrieved August 9, 2019.
• ^ "Public Works". City of Farmers Branch. Retrieved June 3, 2019.
• ^ "Fleet & Facilities Management". City of Farmers Branch. Retrieved June 3, 2019.
• ^ "Zoning Map Archived 2014-04-30 at the Wayback Machine." City of Farmers Branch. Updated March 2013. Retrieved on July 14, 2016. The zoning map shows which areas are zoned for residential use, and only residential-zoned areas are considered in regards to which school zones serve the city.
• ^ "Existing Land Use Archived March 26, 2016, at the Wayback Machine." City of Farmers Branch. Retrieved on July 14, 2016.
• ^ "Home Archived 2012-08-10 at the Wayback Machine." Dave Blair Elementary School. Retrieved on May 5, 2014. "14055 Heartside Dr. Farmers Branch, TX 75234"
• ^ "Farmers Branch Elementary Attendance Area^{[permanent dead link]}." Carrollton-Farmers Branch Independent School District. Retrieved on July 14, 2016.
• ^ "Janie Stark Elementary Attendance Area Archived 2017-02-02 at the Wayback Machine." Carrollton-Farmers Branch Independent School District. Retrieved on July 14, 2016.
• ^ "Neil Ray McLaughlin Elementary School Attendance Area." Carrollton-Farmers Branch Independent School District. Retrieved on July 14, 2016.
• ^ "Nancy H. Strickland Intermediate School Attendance Area^{[permanent dead link]}." Carrollton-Farmers Branch Independent School District. Retrieved on July 14, 2016.
• ^ "Vivian Field Middle School Attendance Area." Carrollton-Farmers Branch Independent School District. Retrieved on July 14, 2016.
• ^ "R.L. Turner High School Attendance Area Archived 2017-02-02 at the Wayback Machine." Carrollton-Farmers Branch Independent School District. Retrieved on July 14, 2016.
• ^ "La Villita Elementary School Attendance Area^{[permanent dead link]}." Carrollton-Farmers Branch Independent School District. Retrieved on July 14, 2016.
• ^ "Barbara Bush Middle School Attendance Area Archived 2017-02-02 at the Wayback Machine." Carrollton-Farmers Branch Independent School District. Retrieved on July 14, 2016.
• ^ "Ranchview High School Attendance Area Archived 2017-02-02 at the Wayback Machine." Carrollton-Farmers Branch Independent School District. Retrieved on July 14, 2016.
• ^ "Early College High School". Brookhaven College. Archived from the original on April 19, 2019. Retrieved April 20, 2019.
• ^
• Jump up to:
• ^{a b} "City of Farmers Branch District Zoning Map" (Archive). City of Farmers Branch. Adopted February 24, 1969. Updated March 2013. Retrieved on April 30, 2014.
• ^ Zoga, Diana (December 14, 2017). "Dallas School Board Approves New Names for Three Schools Currently Named After Confederate Generals". KXAS-TV (NBC DFW). Retrieved December 14, 2017.
• ^ "2015-16 William L. Cabell Elementary Attendance Zone Grades PK-5." Dallas Independent School District. Retrieved on June 10, 2016.
• ^ Smith, Corbett (December 16, 2017). "Schools honoring Confederate generals get new names as Dallas ISD pledges to strive for equity". The Dallas Morning News. Retrieved December 17, 2017. William L. Cabell Elementary will become Chapel Hill Preparatory, named after the surrounding community in Farmers Branch.
• ^ "Tom C. Gooch Elementary Attendance Zone Grades PK-5." Dallas Independent School District. Retrieved on May 5, 2014.
• ^ "2013-14 Thomas C. Marsh Middle Attendance Zone Grades 6-8." Dallas Independent School District. Retrieved on May 5, 2014.
• ^ "2013-14 W. T. White High Attendance Zone Grades 9-12." Dallas Independent School District. Retrieved on May 5, 2014.
• ^ "Farmers Branch Voters Say No To Separate ISD". CBS DFW. May 16, 2011. Archived from the original on May 5, 2014. ()
• ^ "Home." Mary Immaculate Catholic School. Retrieved on May 5, 2014. "14032 Dennis Lane, Farmers Branch, TX 75234"
• ^ "Home (Elementary)". German International School of Dallas. Retrieved November 16, 2019. Postal Address 12411 Templeton Trl, Dallas, TX, 75234 - Despite the city name stated as "Dallas, TX", it is physically in the Farmers Branch city limits.
• ^ Texas Education Code: Sec. 130.176. DALLAS COUNTY COMMUNITY COLLEGE DISTRICT SERVICE AREA.
• ^
• Jump up to:
• ^{a b} "学校紹介 Archived March 30, 2014, at the Wayback Machine." Japanese School of Dallas. Retrieved on March 30, 2014. "学校所在地 JAPANESE SCHOOL OF DALLAS C/O TED POLK MIDDLE SCHOOL 2001 KELLY BLVD. CARROLLTON, TEXAS 75006" and "事務局所在地 JAPANESE SCHOOL OF DALLAS 4100 ALPHA RD. SUITE 917 DALLAS, TEXAS 75244"
• ^ Home page. Japanese School of Dallas. Retrieved on July 15, 2016. "ダラス補習校＆ダラス日本人会事務所移転のお知らせ 現在使用しております事務所は、7月25日（月）より下記住所に移転します。 それに伴い７月20日（水）～22日（金）は移転作業を行います。[...]校舎所在地には変更はありません。 事務所新住所：4101 McEwen Suite 245, Dallas, TX 75244"

External links[edit]

Wikimedia Commons has media related to Farmers Branch, Texas.

• City of Farmers Branch official website

Categories:

• Cities in the Dallas–Fort Worth metroplex
• Cities in Texas
• Cities in Dallas County, Texas
• Populated places established in 1843
• 1843 establishments in the Republic of Texas