2103-454 Ventilation and Air Conditioning Cooling Load...
Transcript of 2103-454 Ventilation and Air Conditioning Cooling Load...
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21032103--454 Ventilation and Air Conditioning454 Ventilation and Air Conditioning
Cooling LoadCooling Load CalculationsCalculations
byby
Assist. Prof. Dr. Tul Assist. Prof. Dr. Tul ManewattanaManewattana.. ChulalongkornChulalongkorn UniversityUniversity
Bangkok, THAILANDBangkok, THAILAND
November 2010November 2010
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Principles of Cooling LoadPrinciples of Cooling Load
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Principles of Cooling LoadPrinciples of Cooling Load
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Principles of Cooling LoadPrinciples of Cooling Load
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Principles of Cooling LoadPrinciples of Cooling Load
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Principles of Cooling LoadPrinciples of Cooling Load
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Principles of Cooling LoadPrinciples of Cooling Load
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Outdoor Design ConditionOutdoor Design Condition
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Outdoor Design ConditionOutdoor Design Condition
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1010
Outdoor Design ConditionOutdoor Design Condition
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1111
Outdoor Design ConditionsOutdoor Design Conditions
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1212
Indoor Design ConditionIndoor Design Condition
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1313
Indoor Design ConditionIndoor Design Condition
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1414
Components of Cooling LoadComponents of Cooling Load
1) External Load
2) Internal Load
3) Outdoor Air Load
1.1) Roofs
1.2) Wall
1.3) Glass (Windows)
1.4) Ceiling
1.5) Floor
1.6) Partition
2.1) People
2.2) Lights
2.3) Power
2.4) Appliances
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1515
Lighting Heat GainLighting Heat Gain
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1616
LightingLighting
Radiant-CL
41% Conv.59% Radiant
Heat Gain
Conv-CL
Total-CL
Sum
NS-RTS
Watt & Usage
Profile
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1717
Cooling Load from LightsCooling Load from Lights
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1818
Convective/Radiant SplitConvective/Radiant Split
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1919
NonsolarNonsolar RTS ValuesRTS Values
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2020
NonsolarNonsolar RTSRTS
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2121
Cooling Load from LightsCooling Load from Lights
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2222
Calculation ExampleCalculation Example
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Example of CalculationsExample of Calculations
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2424
Plenum Heat BalancePlenum Heat Balance
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2525
Approximate Watt/Approximate Watt/Sq.mSq.m
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2626
Lighting Efficiency CompareLighting Efficiency Compare
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2727
Wall Heat GainWall Heat Gain
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2828
WallWallLocation &
Outside Design Conditions
Radiant-CL
37% Conv.63% Radiant
Heat GainHeat InputSol-air Temp
Conv-CL
Total-CL
Sum
Wall CTS
NS-RTS
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2929
Solar Irradiance on WSolar Irradiance on W--WallWall
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3030
Solar AngleSolar Angle
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3131
Solar EquationsSolar Equations
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3232
Solar Irradiance DataSolar Irradiance Data
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3333
Earth OrbitEarth Orbit
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3434
DeclinationDeclination
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3535
WW--Wall Cooling LoadWall Cooling Load
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3636
WW--Wall TimeWall Time--delay Effectdelay Effect
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3737
SolSol--Air TemperatureAir Temperature
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3838
SolSol--Air TemperatureAir Temperature
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3939
SolSol--air Temperatureair Temperature
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4040
Wall CTSWall CTS
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4141
Wall CTSWall CTS
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4242
UU--ValueValue
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4343
Film Coefficient of AirFilm Coefficient of Air
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4444
Air GapAir Gap
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4545
KK--ValueValue
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4646
UU--ValueValue
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4747
UU--ValueValue
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4848
UU--ValueValue
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4949
Energy Efficient WallEnergy Efficient Wall
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5050
Roof Heat GainRoof Heat Gain
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5151
RoofRoofLocation &
Outside Design Conditions
Radiant-CL
16% Conv.84% Radiant
Heat GainHeat InputSol-air Temp
Conv-CL
Total-CL
Sum
Roof CTS
NS-RTS
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5252
Roof CTSRoof CTS
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5353
UU--ValueValue
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5454
UU--ValueValue
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5555
RR--Value of AtticsValue of Attics
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5656
Partition/Floor/Ceiling Heat GainPartition/Floor/Ceiling Heat Gain
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5757
Ceiling/Floor/PartitionCeiling/Floor/Partition
Radiant-CL
37% Conv.63% Radiant
Heat Gain
Conv-CL
Total-CL
Sum
NS-RTS
Heat Input CTS
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5858
Partition/Ceiling/FloorPartition/Ceiling/Floor
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5959
UU--ValueValue
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6060
Temperature for Temperature for Adjacent Adjacent UncondUncond--RoomRoom
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6161
Temperature forTemperature for Adjacent Adjacent UncondUncond--RoomRoom
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6262
WINDOW HEAT GAINWINDOW HEAT GAIN
1) Window Conduction Heat Gain1) Window Conduction Heat Gain
2) Window Solar Heat Gain2) Window Solar Heat Gain
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6363
WindowWindow--Solar #1Solar #1Location &
Outside Design Conditions
Radiant-CL
37% Conv.63% Radiant
Beam Heat Gain
Conv-CL
Total-CL
Sum
NS-RTS
Diffuse Heat Gain
100% Radiant
Heat Input - Solar Irradiance
(Direct, Diffuse, Reflect)
S-RTS
No Blinds or
Overhang
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6464
WindowWindow--ConductionConductionOutside Design Conditions
Radiant-CL
37% Conv.63% Radiant
Heat GainOutside Air Temp
Conv-CL
Total-CL
Sum
NS-RTS
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6565
WW--Window Heat GainWindow Heat Gain
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6666
WW--Window CLWindow CL
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6767
Beam Solar TimeBeam Solar Time--delay Effectdelay Effect
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6868
Diff. Solar TimeDiff. Solar Time--delay Effectdelay Effect
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6969
WW--Window CL ComponentsWindow CL Components
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7070
Solar RTS ValuesSolar RTS Values
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7171
SHGCSHGC
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7272
UU--Factors for GlassFactors for Glass
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7373
Insulating Glass Unit (IGU)Insulating Glass Unit (IGU)
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7474
WindowWindow--Solar #2Solar #2Location &
Outside Design Conditions
Radiant-CL
37% Conv.63% Radiant
Beam Heat Gain x IAC
Conv-CL
Total-CL
Sum
NS-RTS
Diffuse Heat Gain x IAC
Heat Input - Solar Irradiance
(Direct, Diffuse, Reflect)
With Blinds No
Overhang
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7575
WindowWindow--Solar #3Solar #3Location &
Outside Design Conditions
Radiant-CL
37% Conv.63% Radiant
Beam Heat Gain x IAC
Conv-CL
Total-CL
Sum
NS-RTS
Diffuse Heat Gain x IAC
Heat Input - Solar Irradiance
(Direct, Diffuse, Reflect)
With Blinds and
Overhang
Shading Fraction & EAC
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7676
Venetian Blinds Venetian Blinds Shading Coefficients (IAC)Shading Coefficients (IAC)
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7777
Venetian BlindsVenetian Blinds
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7878
Draperies IACDraperies IAC
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7979
DraperiesDraperies
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8080
External ShadingExternal Shading
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8181
External ShadingExternal Shading
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8282
External ShadingExternal Shading
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8383
People Heat GainPeople Heat Gain
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8484
PeoplePeople
Radiant-CL
40-63% Conv.60-27% Radiant
Sensible
Heat Gain
Conv-CL
Total-CL
Sum
NS-RTS
Latent Heat Gain
Heat Gain Per Person &
Usage Profile
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8585
People Heat GainPeople Heat Gain
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8686
Occupant Density (PTT Bld.)Occupant Density (PTT Bld.)
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8787
Motor Heat GainMotor Heat Gain (Power)(Power)
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8888
Motor Heat GainMotor Heat Gain
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8989
Appliances Heat GainAppliances Heat Gain
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9090
EquipmentsEquipments
Radiant-CL
80-20% Conv.20-80% Radiant
Sensible
Heat Gain
Conv-CL
Total-CL
Sum
NS-RTS
Latent Heat Gain
Heat Gain Per Equipment & Usage Profile
Exhaust
Hood
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9191
Heat Gain from EquipmentsHeat Gain from Equipments
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9292
Hood Load FactorHood Load Factor
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9393
Office Equipment Load FactorOffice Equipment Load Factor
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9494
Actual Load FactorActual Load Factor
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9595
Ventilation/Infiltration Heat GainVentilation/Infiltration Heat Gain
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9696
Outside AirOutside Air
Sensible
Heat Gain
Total-CL
Sum
Latent Heat Gain
CFM, Design Conditions & Usage Profile
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9797
Outdoor Air LoadOutdoor Air Load
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9898
Ventilation CFM: Ventilation CFM: ASHRAE Standard 62ASHRAE Standard 62--20072007
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9999
Example: Calculation of Ventilation Example: Calculation of Ventilation RateRate
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100100
MiscellaneousMiscellaneous
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101101
Duct Heat GainDuct Heat Gain
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102102
Duct Leak LossDuct Leak Loss
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103103
Duct Leakage ClassDuct Leakage Class
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104104
Duct Heat Gain & Leak LossDuct Heat Gain & Leak Loss
Duct Heat Gain in % of RSHDuct Heat Gain in % of RSH --Supply Duct 1.5% (Typical Value)Supply Duct 1.5% (Typical Value) --Return Duct 1.5% (Typical Value)Return Duct 1.5% (Typical Value)
Duct Leakage in % of Total Air SupplyDuct Leakage in % of Total Air Supply --Supply Duct 3% (Typical Value)Supply Duct 3% (Typical Value) --Return Duct 0% (Typical Value)Return Duct 0% (Typical Value)
Note that these value are only approximated.Note that these value are only approximated.
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105105
Effect of Internal MassEffect of Internal Mass
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106106
Room Temperature VariationRoom Temperature Variation
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107107
Diversity Factor & Block LoadDiversity Factor & Block Load