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221:. The process may include filtering, heating, cooling, humidification, or dehumidification, all of which consume energy. Since building occupants demand less than 100% fresh air, only a fraction of that amount is admitted to the system, with and equal amount of treated air exhausted to the atmosphere; fresh air is mixed with conditioned air in a plenum.
233:
purposes. In such conditions the mixing damper will be set to close and the system use full fresh air for optimum energy efficiency. Where fresh air is not required, such as early morning pre-heat or pre-conditioning periods, the mixing damper can be automatically set to full recirculation, again for
228:
concentration in order to automatically modulate the air mix for optimum energy efficiency while maintaining desired fresh air requirements. Such systems work very well in buildings where the occupancy rate can vary greatly throughout the day, or seasonally. Additionally, when outside air conditions
193:: one for the fresh air, one for the exhaust air, and a mixing damper between the two air streams. The mix of fresh air and recirculated air can thus be adjusted to suit the needs of the building's occupants. Most systems will use motorized dampers to control the air mixing, and controlled by the
197:(BMS), or controls system. Typically as the fresh air and exhaust air dampers are driven from 0% open to 100% open, the mixing damper will in turn be driven from 100% open to 0% open, so as to always ensure a constant volume of supply and extract air.
173:) with fresh air to provide a supply air mixture for onward distribution to the building or area which the ventilation system is serving. The air transferred from the return air stream to the supply air stream is termed
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used for the heating and cooling air: (1) supply air (2) fan section (3) vibration isolator (4) cooling coil (5) filter (6) mixed air duct
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are such, typically mid-season weather conditions, it may be that ambient temperatures are suitable for
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Montgomery, Ross; McDowall, Robert (2009). "Chapter 4 - Sensors and
Auxiliary Devices".
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The mixing plenum normally combines two air streams, and includes for three sets of
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The most common application for an air-mixing plenum is the mixing of
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Enhanced controls systems may monitor the return air quality or
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Air supply to a building is generally performed by an
177:. All air not mixed is rejected to the atmosphere as
46:. Unsourced material may be challenged and removed.
280:. Elsevier Science & Technology. p. 103.
255:. Elsevier Science & Technology. p. 100.
158:Air streams are mixed to save energy and improve
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162:by partially recirculating conditioned air.
276:Montgomery, Ross; McDowall, Robert (2009).
251:Montgomery, Ross; McDowall, Robert (2009).
146:construction for mixing air from different
1733:Heating, ventilation, and air conditioning
1105:High efficiency glandless circulating pump
354:Heating, ventilation, and air conditioning
345:
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126:in a mixing plenum, complete with mixing
106:Learn how and when to remove this message
1539:Mold growth, assessment, and remediation
204:
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1412:Programmable communicating thermostat
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305:. Elsevier Science & Technology.
1534:Mechanical, electrical, and plumbing
303:Fundamentals of HVAC Control Systems
278:Fundamentals of HVAC Control Systems
253:Fundamentals of HVAC Control Systems
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44:adding citations to reliable sources
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13:
1395:Minimum efficiency reporting value
14:
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1437:Standard temperature and pressure
1150:Packaged terminal air conditioner
686:Passive daytime radiative cooling
415:Heat pump and refrigeration cycle
506:Absorption-compression heat pump
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1401:Normal temperature and pressure
781:Vapor-compression refrigeration
31:needs additional citations for
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1549:Testing, adjusting, balancing
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1488:Building services engineering
1065:Ground-coupled heat exchanger
593:Demand controlled ventilation
541:Building insulation materials
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140:building services engineering
1110:High-pressure cut-off switch
661:Ice storage air conditioning
582:Dedicated outdoor air system
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1255:Thermostatic radiator valve
766:Underfloor air distribution
701:Radiant heating and cooling
619:Energy recovery ventilation
531:Automobile air conditioning
395:Domestic energy consumption
234:optimum energy efficiency.
138:(or mixing box) is used in
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195:building management system
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820:Air conditioner inverter
599:Displacement ventilation
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475:Thermal destratification
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1697:World Refrigeration Day
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1417:Programmable thermostat
1349:Clean air delivery rate
1245:Thermal expansion valve
1160:Pressurisation ductwork
1070:Ground source heat pump
511:Absorption refrigerator
1687:Glossary of HVAC terms
1649:Sick building syndrome
1529:Mechanical engineering
1240:Smoke exhaust ductwork
671:Mixed-mode ventilation
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1385:Intelligent buildings
1344:Carbon dioxide sensor
731:Room air distribution
551:Central solar heating
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1443:Thermographic camera
1380:Infrared thermometer
855:Air source heat pump
804:Water heat recycling
370:Air changes per hour
40:improve this article
1375:HVAC control system
1365:Home energy monitor
1339:Building automation
1125:Inverter compressor
787:Variable air volume
696:Passive ventilation
666:Kitchen ventilation
566:Constant air volume
536:Autonomous building
55:"Air-mixing plenum"
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1582:ASTM International
1519:Hydronic balancing
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960:Evaporative cooler
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756:Thermal insulation
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1210:Scroll compressor
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915:Condensing boiler
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211:air handling unit
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160:energy efficiency
136:air-mixing plenum
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85:
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78:
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71:
67:
64:
60:
57: –
56:
52:
51:Find sources:
45:
41:
35:
34:
29:This article
27:
23:
18:
17:
1682:Fireproofing
1466:and services
1462:Professions,
1360:Gas detector
1260:Trickle vent
1235:Smoke damper
1230:Smoke canopy
1225:Space heater
1155:Plenum space
1090:Heating film
970:Exhaust hood
940:Dehumidifier
880:Blast damper
875:Barrier pipe
850:Air purifier
844:
761:Thermosiphon
640:Free cooling
556:Chilled beam
480:Thermal mass
465:Stack effect
450:Particulates
430:Infiltration
361:Fundamental
302:
296:
277:
271:
252:
246:
231:free cooling
223:
216:
188:
178:
174:
170:
166:
164:
157:
135:
133:
102:
93:
83:
76:
69:
62:
50:
38:Please help
33:verification
30:
1728:Ventilation
1692:Warm Spaces
1334:Blower door
1312:and control
1310:Measurement
1291:Windcatcher
1265:Trombe wall
1205:Sail switch
1185:Refrigerant
1180:Recuperator
1055:Grease duct
1015:Freeze stat
1000:Fire damper
870:Back boiler
840:Air ionizer
835:Air handler
799:Ventilation
651:Hybrid heat
516:Air barrier
435:Latent heat
179:exhaust air
171:extract air
1722:Categories
1448:Thermostat
1370:Humidistat
1301:Zone valve
1270:TurboSwing
1145:Oil heater
1115:Humidifier
1045:Gas heater
995:Fan heater
965:Evaporator
950:Economizer
925:Compressor
830:Air filter
813:Components
630:Forced-air
526:Antifreeze
499:Technology
445:Outgassing
385:Convection
238:References
167:return air
66:newspapers
1558:Industry
1407:OpenTherm
1085:Heat pump
1080:Heat pipe
1030:Fume hood
1005:Fireplace
910:Condenser
860:Attic fan
656:Hydronics
185:Operation
150:systems.
96:July 2014
1665:See also
1390:LonWorks
1324:Aquastat
1190:Register
1170:Radiator
825:Air door
625:Firestop
425:Humidity
400:Enthalpy
390:Dilution
375:Bake-out
363:concepts
148:ductwork
1464:trades,
1035:Furnace
900:Chiller
572:Coolant
191:dampers
128:baffles
124:dampers
80:scholar
1617:SMACNA
1577:ASHRAE
1397:(MERV)
1351:(CADR)
1329:BACnet
1282:(ULPA)
1135:Louver
1060:Grille
935:Damper
885:Boiler
783:(VCRS)
584:(DOAS)
309:
284:
259:
82:
75:
68:
61:
53:
1657:(VOC)
1651:(SBS)
1640:(IAQ)
1597:CIBSE
1592:BSRIA
1495:(BIM)
1439:(STP)
1403:(NTP)
1025:Freon
795:(VRF)
789:(VAV)
647:(HRV)
621:(ERV)
595:(DCV)
568:(CAV)
154:Usage
87:JSTOR
73:books
1612:LEED
1572:AMCA
1567:AHRI
1100:HEPA
1020:Flue
945:Duct
307:ISBN
282:ISBN
257:ISBN
169:(or
144:HVAC
142:and
59:news
1622:UMC
1607:IIR
1587:BRE
980:Fan
209:An
134:An
42:by
1724::
181:.
346:e
339:t
332:v
315:.
290:.
265:.
130:.
109:)
103:(
98:)
94:(
84:·
77:·
70:·
63:·
36:.
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