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Heating or air-conditioning system
Variable air volume (VAV) is a type of heating, ventilating, and/or air-conditioning (HVAC) system. Unlike constant air volume (CAV) systems, which supply
Variable_air_volume
Air conditioning system that allows for individual control of spaces
installed with an air conditioner inverter which adds a DC inverter to the compressor in order to support variable motor speed and thus variable refrigerant
Variable_refrigerant_flow
HVAC system
auto-oscillation. An alternative to a constant air volume system is a variable air volume (VAV) system. Variable air volume systems are generally more complex than
Forced-air
Type of heating, ventilating, and air-conditioning (HVAC) system
systems are somewhat rare. Due to fan energy savings potential, variable air volume (VAV) systems are more common. However, in small buildings and residences
Constant_air_volume
Type of local ventilation device
since the early 2000s, resulting in technical advances, such as variable air volume, high-performance and occupancy sensor-enabled fume hoods, as well
Fume_hood
Registered trade name for halocarbon products
(VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components Air conditioner inverter Air door Air filter
Freon
Conduit used in heating, ventilation, and air conditioning
Zone dampers provide automatic control in simple systems while variable air volume (VAV) allows control in sophisticated systems. Smoke dampers and
Duct_(flow)
Technology of indoor and vehicular environmental comfort
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
Heating, ventilation, and air conditioning
Heating,_ventilation,_and_air_conditioning
Communication protocol used for building automation
line for HVAC controls, from the operator's workstation to small variable air volume (VAV) controllers. Automated Logic Corporation and Delta Controls
BACnet
Cooling of air in an enclosed space
Japan. Variable refrigerant flow systems when compared with central plant cooling from an air handler, eliminate the need for large cool air ducts, air handlers
Air_conditioning
Device that removes contaminants from the air in a room
An air purifier or air cleaner is a device which removes contaminants from the air in a room to improve indoor air quality. These devices are commonly
Air_purifier
Type of heating, ventilation and air-conditioning system
through the building enclosure. Traditional HVAC systems, such as variable air volume (VAV) systems serving multiple zones, have potential problems in
Dedicated_outdoor_air_system
Engineering discipline
common. Other techniques such as finite difference method (FDM) and finite-volume method (FVM) are employed to solve problems relating heat and mass transfer
Mechanical_engineering
Heat transfer due to the movement of fluid
sinks. Thus, the hotter volume transfers heat towards the cooler volume of that fluid. Familiar examples are the upward flow of air due to a fire or hot
Convection_(heat_transfer)
Physics of heat, work, and temperature
temperature, pressure, or volume, etc., are held fixed; Furthermore, it is useful to group these processes into pairs, in which each variable held constant is
Thermodynamics
Component of air conditioning and refrigeration systems
TXV, or TX valve), is a component in vapor-compression refrigeration and air conditioning systems that controls the amount of refrigerant released into
Thermal_expansion_valve
Electrical device to ionise air molecules
An air ioniser (or negative ion generator or Chizhevsky's chandelier) is a device that uses high voltage to ionise (electrically charge) air molecules
Air_ioniser
Range of indoor air temperatures preferred by most people
Room temperature, colloquially, denotes the range of air temperatures most people find comfortable indoors while dressed in typical clothing. Comfortable
Room_temperature
Absorption refrigerator invented in 1930
(VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components Air conditioner inverter Air door Air filter
Einstein_refrigerator
Device that changes direct current (DC) to alternating current (AC)
control the speed of the compressor motor to drive variable refrigerant flow in a refrigeration or air conditioning system to regulate system performance
Power_inverter
Home automation software
(VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components Air conditioner inverter Air door Air filter
Home_Assistant
Device used to regulate and circulate air as part of an HVAC system
residential air handlers in the USA (central "furnaces" or "air conditioners") use a brushless DC electric motor that has variable speed capabilities. Air handlers
Air_handler
Liquid additive
engine coolant, such as −34 °F (−37 °C) to +265 °F (129 °C) for 50% (by volume) propylene glycol diluted with distilled water and a 15 psi pressurized
Antifreeze
Device which removes solid particulates from the air
A particulate air filter is a device composed of fibrous or porous materials which removes particulates such as smoke, dust, pollen, mold, viruses, and
Air_filter
Efficiency standard of air filters
measured in m/s and can be calculated as the volume flow rate (m3/s) divided by the face area (m2). The air space between HEPA filter fibers is typically
HEPA
Measure of energy in a thermodynamic system
is the increase of the volume of the system). Cases of long-range electromagnetic interaction require further state variables in their formulation and
Enthalpy
Heating of air in buildings or vehicles
thermal energy. It is a fundamental component of heating, ventilation, and air conditioning (HVAC) systems, providing warmth to residential, commercial
Heating_system
Measure of the air volume added to or removed from a space
Air changes per hour, abbreviated ACPH or ACH, or air change rate is the number of times that the total air volume in a room or space is completely removed
Air_changes_per_hour
Honeywell T87, its classic "Round" thermostat Variable Air Volume (VAV) Controller, Wall Module and Box Variable Frequency Drive (VFD) Warehouse Automation
List of Honeywell products and services
List_of_Honeywell_products_and_services
System to cool the air in a vehicle
Automotive air conditioning systems use air conditioning to cool the air in a vehicle. A company in New York City in the United States first offered the
Automotive_air_conditioning
Interior fungal growth
spores are like seeds—but invisible to the naked eye—that float through the air and deposit on surfaces. When the temperature, moisture, and available nutrient
Indoor_mold
Device for firing solid fuels in buildings
area to be heated. There are also air quality control issues due to the amount of moisture they release into the room air, and an oxygen sensor and a carbon
Fireplace
Tendency of a fluid jet to stay attached to a surface of any form
free air, without the neighbouring ceiling. Lower discharge velocity means lower noise levels and, in the case of variable air volume (VAV) air conditioning
Coandă_effect
System that transfers heat from one space to another
temperatures and were better suited for warm climates, newer models with variable-speed compressors remain highly efficient in freezing conditions allowing
Heat_pump
Valve or plate for regulating airflow
resetting in the event of closure. Zone valve Variable air volume (VAV) Testing, adjusting, balancing Air-mixing plenum "Louvres and Dampers - HVC". www
Damper_(flow)
Substance used to reduce or regulate the temperature of a system
reservoir captures overflow of coolant in a cooling system. Air is a common form of a coolant. Air cooling uses either convective airflow (passive cooling)
Coolant
Standards organization
(VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components Air conditioner inverter Air door Air filter
ASTM_International
Aspects of fluid mechanics involving fluid flow
of state that gives the pressure as a function of other thermodynamic variables is required to completely describe the problem. An example of this would
Fluid_dynamics
Minimization of heat transfer
cork. Trapping air is also the principle in all highly insulating clothing materials such as wool, down feathers and fleece. The air-trapping property
Thermal_insulation
Thermodynamic phase transition energy
such as of volume and pressure, when the thermodynamic system was held at constant temperature in a thermal bath. It was known that when the air temperature
Latent_heat
Treatment of air from kitchens
ventilation is the branch of ventilation specialising in the treatment of air from kitchens. It addresses the problems of grease, smoke and odours not
Kitchen_ventilation
Process for digital management of built assets
has been replaced with reference to the Asset Information Requirements (AIR) and an Asset Information Model (AIM) as specified in BS EN ISO 19650-3:2020
Building_information_modeling
Release of a gas that was inside of some material
Outgassing (sometimes called offgassing, particularly when in reference to indoor air quality) is the release of a gas that was dissolved, trapped, frozen, or
Outgassing
Closed vessel in which fluid is heated
generators are heated by the heat produced by nuclear fission. Where a large volume of hot gas is available from some process, a heat recovery steam generator
Boiler
Heat exchanged by a body or thermodynamic system
macroscopic variables of the body or system, but leaves unchanged certain other macroscopic variables of the body or system, such as volume or pressure
Sensible_heat
Air quality within and around buildings and structures
Indoor air quality (IAQ) is the air quality within buildings and structures. Poor indoor air quality due to indoor air pollution is known to affect the
Indoor_air_quality
Concentration of water vapour in the air
relative, and specific. Absolute humidity is the mass of water vapor per volume of air (in grams per cubic meter). Relative humidity, often expressed as a
Humidity
Method of heat exchange in which convection drives pumpless circulation
water heaters, boilers and furnaces. Thermosiphoning also occurs across air temperature gradients such as those occurring in a wood-fire chimney or solar
Thermosiphon
Refrigeration process
of the many refrigeration cycles and is the most widely used method for air conditioning of buildings and automobiles. It is also used in domestic and
Vapor-compression refrigeration
Vapor-compression_refrigeration
Concept in architectural and engineering practice
and unconditioned environment of a building, including the resistance to air, water, heat, light, and noise transfer. The building envelope or enclosure
Building_envelope
Ventilation grill with moving parts
of being opened and closed and the air flow directed, which is part of a building's heating, ventilation, and air conditioning (HVAC) system. The placement
Register_(air_and_heating)
Device that cools air through the evaporation of water
performance is variable due to changes in external temperature and humidity level. A residential cooler should be able to decrease the temperature of air to within
Evaporative_cooler
Mathematical models of heat pumps and refrigeration
yifei (2024-10-21). "Heat Pump Vs Air Conditioner". NEWNTIDE. Retrieved 2024-08-30. The Systems and Equipment volume of the ASHRAE Handbook, ASHRAE, Incorporated
Heat pump and refrigeration cycle
Heat_pump_and_refrigeration_cycle
Thermal engineering discipline concerning transfer of heat in physical systems
conductivities of mercury, water, moist air, "common air" (dry air at normal atmospheric pressure), dry air of various rarefication, and a "Torricellian
Heat_transfer
Window protection with horizontal angled slats
slats (also sometimes called louvers/louvres) are angled to admit light and air, as well as to keep out rain and direct sunshine. The angle of the slats
Louver
Technique for ventilation of a building
Underfloor air distribution (UFAD) is an air distribution strategy for providing ventilation and space conditioning in buildings as part of the design
Underfloor_air_distribution
Machine to increase pressure of gas by reducing its volume
mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor. Many compressors can
Compressor
Subfields of building design and construction
supply, oxygen distribution, vacuum or compressed air, and solids handling. Plumbing systems also service air distribution/control, and therefore contribute
Mechanical, electrical, and plumbing
Mechanical,_electrical,_and_plumbing
Device used for heating buildings
Ahmed, Rifat (2020-06-01). "Handbook on Single, Multi & Variable Speed Furnaces" (PDF). Green Leaf Air. Archived (PDF) from the original on 2020-07-05. Retrieved
Furnace_(central_heating)
Heat-transfer device that employs phase transition
without the influence of gravity. That cooling system was the first to use variable-conductance heat pipes to actively regulate heat flow or evaporator temperature
Heat_pipe
Machine that removes heat from a liquid coolant
through a heat exchanger to cool equipment, or another process stream (such as air or process water). As a necessary by-product, refrigeration creates waste
Chiller
Intentional introduction of outside air into a space
total outdoor air intake of the ventilation system (in multiple-zone variable air volume (VAV) systems) might therefore be similar to the airflow required
Ventilation_(architecture)
Thermometer which infers temperature by measuring infrared energy emission
(VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components Air conditioner inverter Air door Air filter
Infrared_thermometer
Household appliance that heats a single room or other small area
flow. Forced-convection heaters utilize a device like a fan to generate air flow and spread heat at a fast pace. Sometimes called fan heaters, these
Space_heater
Type of heating system
The heat is circulated through the building either by fans forcing heated air through ducts, circulation of low-pressure steam to radiators in each heated
Central_heating
Device designed to create radiative heat
spaces without proper air exchange. Fuel efficiency and radiant output are strongly influenced by nozzle spray angle and flow rate, air-to-fuel ratio, and
Infrared_heater
Building automation network
International, and each standard parameter is known as Standard Network Variable Type (SNVT, pronounced "sniv-it.") For example, a thermostat might report
LonWorks
Chemistry concept
The equation can only be applied when the purged volume of vapor or gas is replaced with "clean" air or gas. For example, the equation can be used to
Dilution_(equation)
Symptoms of illness attributed to a building
variables, the investigators obtained results that compare with past studies of SBS and gender. The study team found that across most test variables,
Sick_building_syndrome
Method of reusing thermal energy in a building
the fresh air introduced into the air conditioning system is preheated (or pre-cooled) before it enters the room, or the air cooler of the air conditioning
Heat_recovery_ventilation
American HVAC professional association
dedicated outdoor air supply (DOAS) system with energy recovery and humidity control; a ground-source heat pump system; and variable refrigerant flow systems
ASHRAE
Filtration efficacy measurement
high efficiency filter that is filtering a small amount of air, or by a high volume of air that is not being filtered very well. The CADR ratings were
Clean_air_delivery_rate
Wall-mounted air conditioning system
A packaged terminal air conditioner (PTAC) is a type of self-contained heating and air conditioning system intended to be mounted through a wall. The first
Packaged terminal air conditioner
Packaged_terminal_air_conditioner
Concept in physics
temperature of the air within the building relative to the outdoor ambient air. It also decreases the specific volume of the air contained within the
Stack_effect
Temperature control system
for more cost-effective compressors compared to ones with continuously variable capacity.[clarification needed] Another consideration is the time delay
Thermostat
Refrigerator that uses a heat source
mains-powered electric heater. Absorption refrigerators can also be used to air-condition buildings using the waste heat from a gas turbine or water heater
Absorption_refrigerator
Branch of automation
Washington's SR 520 and Japan's Mega-Float. Analog inputs are used to read a variable measurement. Examples are temperature, humidity and pressure sensors which
Building_automation
Consumer space heater
aluminium fins, thereby heating the fins. A fan blows air across the fins, cooling the fins as they heat the air. Electric heating elements made of resistance
Ceramic_heater
Mechanical fan that forces fluid to move radially outward
axial fans, constant-volume devices, meaning that, at a constant fan speed, a centrifugal fan moves a relatively constant volume of air rather than a constant
Centrifugal_fan
Air conditioning technology
speed. Variable speed technology can be implemented in HVAC, close control and process cooling applications and as diverse as packaged or split air-conditioning
Inverter_compressor
Type of convection heater
convection, through the walls via conduction, and then to the surroundings via air convection and thermal radiation. The columns of oil heaters are typically
Oil_heater
Skyscraper in Riyadh, Saudi Arabia
unique programs. Systems used to cool these spaces include variable air volume, constant volume, and fan coils. Saudi Arabia portal List of tourist attractions
Kingdom_Centre
Typically a portable, unvented, kerosene-fueled, space-heating device
it turns into a gas (gasification) and this gas is then burnt which heats air via convection or nearby objects via radiation. The burner is designed to
Kerosene_heater
Type of stove
chimney. Keeping the air flowing correctly through a wood-burning stove is essential for safe and efficient operation of the stove. Fresh air needs to enter
Wood-burning_stove
High-performance energy-efficiency building standard
complextiy of the wall assembly in particular, and particular attention to air, water, and vapour barriers, including at all penetrations. They also include
Passive_house
Most common type of heat pump
vs. Variable Speed For Heat Pump/Air Conditioner". How to Choose Best HVAC Systems. 4 April 2018. Retrieved 19 February 2024. "Cold climate air source
Air_source_heat_pump
Tank used in hot water systems
water from the air pocket. This now-obsolete style would gradually transfer air from the tank to the highest point in the system, due to air dissolving in
Expansion_tank
Seal around openings in a fire-resistance-rated wall or floor
(VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components Air conditioner inverter Air door Air filter
Firestop
Total energy consumption of single household
(VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components Air conditioner inverter Air door Air filter
Domestic_energy_consumption
Valve that reverses flow direction in part of a circuit
(VCRS) Variable air volume (VAV) Variable refrigerant flow (VRF) Ventilation Water heat recycling Components Air conditioner inverter Air door Air filter
Reversing_valve
Part of a building hosting air circulation for heating and air conditioning systems
plenum space is a part of a building that can facilitate air circulation for heating and air conditioning systems, by providing pathways for either heated/conditioned
Plenum_space
Process in which electrical energy is converted to heat
versions are also made, as well as versions with 4 heat settings or a variable heat setting. An electric water boiler, also called a thermo pot, is a
Electric_heating
Architectural element for creating a draft
climates, where high-volume air flow is more important compared to evaporative cooling. In hotter climates, they are narrower, and air is cooled on its way
Windcatcher
Space in a building dedicated to the mechanical equipment
rooms in residential houses typically house technical equipment such as air handling units, central heating, electric panels or water heaters, or gives
Mechanical_room
Damp proofing material in sheet form
migration of air. This is the function of air barriers. Air is mixed with water vapor. When air moves from location to location due to an air pressure difference
Vapor_barrier
Self-regulating valve to control hot water flow
set for each room. As the valve works by sensing the temperature of the air surrounding it, it is important to ensure that it is not covered by material
Thermostatic_radiator_valve
Measurement scale for the effectiveness of air filters
American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) to report the effectiveness of air filters in more detail than other ratings
Minimum efficiency reporting value
Minimum_efficiency_reporting_value
Control system for heating, ventilation, and air conditioning equipment
(Heating, Ventilation and Air Conditioning) equipment needs a control system to regulate the operation of a heating and/or air conditioning system. Usually
HVAC_control_system
Equipment used to transfer heat between fluids
coolant flows through radiator coils and air flows past the coils, which cools the coolant and heats the incoming air. Another example is the heat sink, which
Heat_exchanger
System for condensing gas into liquid by cooling
design variables including the working fluid, the secondary fluid, the geometry, and the material. Common secondary fluids include water, air, refrigerants
Condenser_(heat_transfer)
VARIABLE AIR-VOLUME
VARIABLE AIR-VOLUME
Surname or Lastname
Scottish spelling of Irish Hare.English
Scottish spelling of Irish Hare.English : nickname for someone with some peculiarity of the hair, from Middle English here ‘hair’.
Female
Welsh
Welsh form of Greek Maria, MAIR means "obstinacy, rebelliousness" or "their rebellion."
Male
Icelandic
Icelandic form of Old Norse VÃðarr, VIÃAR means "forest warrior."
Surname or Lastname
English
English : from the feminine personal name Mirabel, equated in medieval records with Latin mirabilis ‘marvellous’, ‘wonderful’ (in the sense ‘extraordinary’).
Male
Finnish
 Pet form of Finnish Aaroni, ARI means "light-bringer." Compare with other forms of Ari.
Girl/Female
Tamil
Valuable
Girl/Female
Armenian
Valuable.
Male
Irish
Irish name LIR means "the sea." In mythology, this is the name of a god of the sea. He is identified with Welsh LlÅ·r.
Male
Russian
(КиÌÑ€) Russian name KIR means "master, ruler."
Male
Hebrew
(×™Ö¸×ִיר) Variant spelling of Hebrew Yaiyr, YAIR means "whom God enlightens."Â
Male
Hebrew
(עַטִיר) Hebrew name ATIR means "crown, wreath."
Girl/Female
Gujarati, Hindu, Indian
Valuable
Female
Norse
Old Norse name derived from the word eir, EIR means "help, mercy." In mythology, this is the name of a goddess of healing and medicine.
Boy/Male
Hindi
Valuable.
Male
Icelandic
Icelandic form of Old Norse Hróarr, HRÓAR means "famous spear."
Female
Hebrew
(× Ö´×™×¨) Hebrew unisex name NIR means "to cultivate a field."
Boy/Male
Vietnamese
Valuable.
Boy/Male
Anglo, British, English
Variable
Male
English
Variant spelling of English Gare, GAIR means "spear."
Boy/Male
Hawaiian
Valuable.
VARIABLE AIR-VOLUME
VARIABLE AIR-VOLUME
Girl/Female
Tamil
Wife of bharat in ramayana (Bharat's wife & King Janak's daughter)
Boy/Male
Indian, Punjabi, Sikh
Doing Service
Female
English
Feminine diminutive form of English unisex Page, PAGET means "little patrician; little servant."
Boy/Male
Muslim
Unfettered camel
Boy/Male
Hindu, Indian, Tamil
Base; Brilliant Like the Sun
Girl/Female
Biblical
Ascent of scorpions.
Biblical
hidden
Boy/Male
British, English
From the Sandy Ford
Boy/Male
English Latin American French
Brotherly.. Singer Jermaine Jackson.
Female
Hawaiian
 Hawaiian form of Latin Laura, LALA means "laurel." Compare with another form of Lala.
VARIABLE AIR-VOLUME
VARIABLE AIR-VOLUME
VARIABLE AIR-VOLUME
VARIABLE AIR-VOLUME
VARIABLE AIR-VOLUME
n.
Odoriferous or contaminated air.
a.
Having value or worth; possessing qualities which are useful and esteemed; precious; costly; as, a valuable horse; valuable land; a valuable cargo.
a.
Friendly; kindly; sweet; gracious; as, an amiable temper or mood; amiable ideas.
a.
Invariable.
n.
To expose to the air for the purpose of cooling, refreshing, or purifying; to ventilate; as, to air a room.
n.
To expose to heat, for the purpose of expelling dampness, or of warming; as, to air linen; to air liquors.
a.
Arable; tillable.
a.
Worthy; estimable; deserving esteem; as, a valuable friend; a valuable companion.
a.
Open to a free current of air; exposed to the air; breezy; as, an airy situation.
n.
A particular state of the atmosphere, as respects heat, cold, moisture, etc., or as affecting the sensations; as, a smoky air, a damp air, the morning air, etc.
n.
An invariable quantity; a constant.
a.
Consisting of air; as, an airy substance; the airy parts of bodies.
adv.
In a variable manner.
a.
Having the capacity of varying or changing; capable of alternation in any manner; changeable; as, variable winds or seasons; a variable quantity.
a.
Liable to vary; too susceptible of change; mutable; fickle; unsteady; inconstant; as, the affections of men are variable; passions are variable.
n.
That which is variable; that which varies, or is subject to change.
v. t.
To represent by parable.
n.
A quantity which may increase or decrease; a quantity which admits of an infinite number of values in the same expression; a variable quantity; as, in the equation x2 - y2 = R2, x and y are variables.
n.
The peculiar look, appearance, and bearing of a person; mien; demeanor; as, the air of a youth; a heavy air; a lofty air.
a.
Relating or belonging to air; high in air; aerial; as, an airy flight.