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constant air volume wikipedia jump to content main menu main menu move to sidebar hide navigation main page contents current events random article about wikipedia contact us contribute help learn to edit community portal recent changes upload file special pages search search appearance donate create account log in personal tools donate create account log in contents move to sidebar hide top 1 references toggle the table of contents constant air volume 2 languages العربية தமிழ் edit links article talk english read edit view history tools tools move to sidebar hide actions read edit view history general what links here related changes upload file permanent link page information cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia type of heating ventilating and air conditioning hvac system constant air volume cav is a type of heating ventilating and air conditioning hvac system in a simple cav system the supply air flow rate is constant but the supply air temperature is varied to meet the thermal loads of a space 1 most cav systems are small and serve a single thermal zone however variations such as cav with reheat cav multizone and cav primary secondary systems can serve multiple zones and larger buildings in mid to large size buildings new central cav systems are somewhat rare due to fan energy savings potential variable air volume vav systems are more common however in small buildings and residences cav systems are often the system of choice due to their simplicity low cost and reliability such small cav systems often have on off control rather than supply air temperature modulation to vary their heating or cooling capacities there are two types of cav systems that are commonly in use to modify the supply air temperature the terminal reheat system and the mixed air system 2 the terminal reheat system cools the air in the air handling unit down to the lowest possible needed temperature within its zone of spaces this supplies a comfortable quality to the space but wastes energy the mixed air system has two air streams typically one for the coldest and one for the hottest needed air temperature in the zone the two air streams are strategically combined to offset the space s load the mixed air system option is not as proficient at controlling the humidity yet it does do well at controlling the temperature 3 references edit systems and equipment volume of the ashrae handbook ashrae inc atlanta ga 2004 page needed fire color 2016 09 08 cav vs vav hvac systems the severn group retrieved 2024 01 17 heating piping air conditioning december 1993 p 53 57 v t e heating ventilation and air conditioning fundamental concepts air changes per hour ach bake out building envelope convection dilution domestic energy consumption enthalpy fluid dynamics gas compressor heat pump and refrigeration cycle heat transfer humidity infiltration latent heat noise control outgassing particulates psychrometrics sensible heat stack effect thermal comfort thermal destratification thermal mass thermodynamics vapour pressure of water technology absorption compression heat pump absorption refrigerator air barrier air conditioning antifreeze automobile air conditioning autonomous building building insulation materials central heating central solar heating chilled beam chilled water constant air volume cav coolant cross ventilation dedicated outdoor air system doas deep water source cooling demand controlled ventilation dcv displacement ventilation district cooling district heating electric heating energy recovery ventilation erv firestop forced air forced air gas free cooling heat recovery ventilation hrv hybrid heat hydronics ice storage air conditioning kitchen ventilation mixed mode ventilation microgeneration passive cooling passive daytime radiative cooling passive house passive ventilation radiant heating and cooling radiant cooling radiant heating radon mitigation raised floor refrigeration renewable heat room air distribution solar air heat solar combisystem solar cooling solar heating thermal insulation thermosiphon underfloor air distribution underfloor heating vapor barrier vapor compression refrigeration vcrs variable air volume vav variable refrigerant flow vrf ventilation water heat recycling components air conditioner inverter air door air filter air handler air ionizer air mixing plenum air purifier air source heat pump attic fan automatic balancing valve back boiler barrier pipe blast damper boiler centrifugal fan ceramic heater chiller condensate pump condenser condensing boiler convection heater compressor cooling tower damper dehumidifier duct economizer electrostatic precipitator evaporative cooler evaporator exhaust hood expansion tank fan fan coil unit fan filter unit fan heater fire damper fireplace fireplace insert freeze stat flue freon fume hood furnace gas compressor gas heater gasoline heater grease duct grille ground coupled heat exchanger ground source heat pump heat exchanger heat pipe heat pump heating film heating system hepa high efficiency glandless circulating pump high pressure cut off switch humidifier infrared heater inverter compressor kerosene heater louver mechanical room oil heater packaged terminal air conditioner plenum space pressurisation ductwork process duct work radiator radiator reflector recuperator refrigerant register reversing valve run around coil sail switch scroll compressor solar chimney solar assisted heat pump space heater smoke canopy smoke damper smoke exhaust ductwork thermal expansion valve thermal wheel thermostatic radiator valve trickle vent trombe wall turboswing turning vanes ultra low particulate air ulpa whole house fan windcatcher wood burning stove zone valve measurement and control air flow meter aquastat bacnet blower door building automation carbon dioxide sensor clean air delivery rate cadr control valve gas detector home energy monitor humidistat hvac control system infrared thermometer intelligent buildings lonworks minimum efficiency reporting value merv normal temperature and pressure ntp opentherm programmable communicating thermostat programmable thermostat psychrometrics room temperature smart thermostat standard temperature and pressure stp thermographic camera thermostat thermostatic radiator valve professions trades and services architectural acoustics architectural engineering architectural technologist building services engineering building information modeling bim deep energy retrofit duct cleaning duct leakage testing environmental engineering hydronic balancing kitchen exhaust cleaning mechanical engineering mechanical electrical and plumbing mold growth assessment and remediation refrigerant reclamation testing adjusting balancing industry organizations ahri amca ashrae astm international bre bsria cibse institute of refrigeration iir leed smacna umc health and safety indoor air quality iaq passive smoking sick building syndrome sbs volatile organic compound voc see also ashrae handbook building science fireproofing glossary of hvac terms warm spaces world refrigeration day template fire protection template home automation template plumbing template solar energy this engineering related article is a stub you can help wikipedia by adding missing information v t e retrieved from https en wikipedia org w index php title constant_air_volume oldid 1286394494 categories mechanical engineering heating ventilation and air conditioning engineering stubs hidden categories articles with short description short description matches wikidata wikipedia articles needing page number citations from january 2014 all stub articles this page was last edited on 19 april 2025 at 17 17 utc page was rendered with parsoid text is available under the creative commons attribution sharealike 4 0 license additional terms may apply by using this site you agree 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