heating v cooling load calculations
(Qsolar) + (Qint) = U x A x
SOLAR INTERNAL HEAT TRANSFER HEAT TRANSFER AREA
RADIATION HEAT GAIN COEFFICIENT
TOUT = TIN - ( (Qsolar) + (Qint)
U A
QOPAQUE = U x A x CLTD
HEAT OVERALL HEAT TRANSFER COOLING LOAD
TRANSFER HEAT AREA TEMP. DIFF.
THROUGH TRANSFER
OPAQUE
SURFACES
QTRANS = AUNSHADED x SHGFMAX x SC x
HEAT AREA SOLAR HEAT SHADING
TRANSFER EXPOSED TO GAIN FACTOR COEFFICIENT
THROUGH SOLAR
FENESTRATION RADIATION
QS,INF = MO x CP.M x ( TO
HEAT SPECIFIC HEAT TEMPERATURE
TRANSFER DUE OF THE MOIST OUTDOOR
TO INFILTRATED AIR
INFILTRATION
QI,INF = MO x HFG x ( WO
HEAT DUE TO LATENT HEAT OF HUMIDITY
INFILTRATION VAPORIZATION RATIO
OUTDOOR
VO = (ACH) x V / 3600 m³/s
INFILTRATION AIR CHANGE GROSS VOLUME
RATE BY ACH PER HOUR
VO = A x C x ÐP
DIFF. BET. OUTSIDE
AND INSIDE
PRESSURE
EFFECTIVE LEAKAGE OF THE CRACK
( TIN - TOUT )
REQUIRED REQUIRED
INDOOR OUTDOOR
TEMP. TEMPERATURE
) SENSIBLE
CLF
COOLING
LOAD
FACTOR
- TI ) = VO x PO x
TEMPERAT INFILTRATION RATE, m³ DENSITY OF
URE THE MOIST
INDOOR INFILTRATED
AIR
- WI ) = VO x PO x
HUMIDITY INFILTRATION RATE, m³ DENSITY OF
RATIO THE MOIST
INDDOR INFILTRATED
AIR
CP.M x ( TO - TI )
SPECIFIC HEAT OF TEMPERATURE TEMPERATURE
THE MOIST OUTDOOR INDOOR
INFILTRATED AIR
HFG x ( WO - WI )
LATENT HEAT OF HUMIDITY HUMIDITY RATIO
VAPORIZATION RATIO INDDOR
OUTDOOR
PROJECT:
LOCATION:
SUBJECT:
DATE:
GIVEN: 41.1
ROOM DIMENSION = L 10 W 5 FLR TO FLR
WALL AT WEST SIDE
GLASS DIMENSION = L 10 H 1.5
WALL NET AREA = 20 SQM
WALL = 6" THICK CHB PLASTERED
TEMP. INSIDE = 24 +/-2˚C
TEMP. OUTSIDE 35 ˚C db / 28.8°C wb
Outdoor Relative Humi
= 64 %
Outdoor Enthalpy = 22.4 Kcal / Kg -da
INDOOR TEMP. = 25 ±2 ºCdb / 19.6°Cwb
ROOM ENTHALPY = 12.6 Kcal/ Kg - da
ACH = 12 REQUIREMENTS
EXTERNAL LOADS
QWALL = UWALL X AWALL X ETDWALL
1.78 X ((3.5*10)-(1.5*10) X 25
890 W 20
QROOF = UROOF X AROOF X ETDROOF
1.316 5*10 X 0
0W 50
QFLOOR = UFLOOR X AFLOOR X ETDFLOOR
1.2 X 50 X 0
0W
QGLASS = AGLASS X (UGLASS X (TO -
15 X 3.12 X 10 +
4338 W
HEAT TRANFER DUE TO INFILTRATION
MASSINF = DENSITY OFX (ACH X ROOM VOLUME)
1.095 0.5 120
0.01825
QS,INF = MINF X CPM X (TO -
0.01825 X 1021.6 X 35 -
186.442 W
QS,INF = MINF X HFG X (WO -
0.01825 2501000 0.0107 -
36.5146 W
INTERNAL LOAD
LOAD DUE TO OCCUPANTS
QS,OCC = NO OF OC X SHG
5X 90
450 W
QL,OCC = NO OF OC X LHG
5X 40
200 W
LOAD DUE TO LIGHTINGS
QLIGHTS = 33 X FLOOR AREA
33 X 50
1650 W
LOAD DUE TO APPLIANCE
QS,APP = 3000 W
QL,APP 3800 W
QSTOTAL 10514.44 QWALL + QROOF + QFLOOR +
QLTOTAL 4036.515 QS,INF + QL,OCC + QL,APP
QTOTAL = QSTOTAL + QLTOTAL
14550.96
RSHF = QSTOTAL / QTOTAL
0.722595
REQUIRED COOLING CAPACITY
= QTOTAL * 1.25
18188.7 W
18.1887 Kw
5.173122 TR
SQM/TR 7.944913
PREP ROOM 21.8 2.743894 SAY 3 TR 1200 CFM
RECEIVING 10.3 1.296427 SAY 1.3 TR 520 CFM
CLEANROOM 8.75 1.101334 SAY 1.1 TR 440 CFM
40.85
3.5 CH 2.4
TI) + SHGFMAX X SC)
300 X 0.86
/ 3600
3600
TI)
25
WI)
0.0099
QGLASS + QS,INF + QS,OCC + QLIGHTS + QS,APP
2160
3669.309
30.57758
PROJECT:
LOCATION:
SUBJECT:
DATE:
GIVEN: 1.5
ROOM DIMENSION = L 2.08 W 5 FLR TO FLR
WALL AT WEST SIDE
GLASS DIMENSION = L 2.08 H 1.5
WALL NET AREA = 4.16 SQM
WALL = 6" THICK CHB PLASTERED
TEMP. INSIDE = 24 +/-2˚C
TEMP. OUTSIDE 35 ˚C db / 28.8°C wb
Outdoor Relative Humi
= 64 %
Outdoor Enthalpy = 22.4 Kcal / Kg -da
INDOOR TEMP. = 25 ±2 ºCdb / 19.6°Cwb
ROOM ENTHALPY = 12.6 Kcal/ Kg - da
ACH = 12 REQUIREMENTS
EXTERNAL LOADS
QWALL = UWALL X AWALL X ETDWALL
1.78 X ((3.5*10)-(1.5*10) X 25
323.96 W 7.28
QROOF = UROOF X AROOF X ETDROOF
1.316 5*10 X 0
0W 10.4
QFLOOR = UFLOOR X AFLOOR X ETDFLOOR
1.2 X 10.4 X 0
0W
QGLASS = AGLASS X (UGLASS X (TO -
3.12 X 3.12 X 10 +
902.304 W
HEAT TRANFER DUE TO INFILTRATION
MASSINF = DENSITY OFX (ACH X ROOM VOLUME)
1.095 0.5 24.96
0.003796
QS,INF = MINF X CPM X (TO -
0.003796 X 1021.6 X 35 -
38.77994 W
QS,INF = MINF X HFG X (WO -
0.003796 2501000 0.0107 -
7.595037 W
INTERNAL LOAD
LOAD DUE TO OCCUPANTS
QS,OCC = NO OF OC X SHG
1X 90
90 W
QL,OCC = NO OF OC X LHG
1X 40
40 W
LOAD DUE TO LIGHTINGS
QLIGHTS = 33 X FLOOR AREA
33 X 1.5
49.5 W
LOAD DUE TO APPLIANCE
QS,APP = 620 W
QL,APP W
QSTOTAL 2024.544 QWALL + QROOF + QFLOOR +
QLTOTAL 47.59504 QS,INF + QL,OCC + QL,APP
QTOTAL = QSTOTAL + QLTOTAL
2072.139
RSHF = QSTOTAL / QTOTAL
0.977031
REQUIRED COOLING CAPACITY
= QTOTAL * 1.25
2590.174 W
2.590174 Kw
0.736682 TR
SQM/TR 14.11735
RECEIVING 10.3 0.729598 1.25 0.911998080027019 TR 364.7992 CFM
3.5 CH 2.4
TI) + SHGFMAX X SC)
300 X 0.86
/ 3600
3600
TI)
25
WI)
0.0099
QGLASS + QS,INF + QS,OCC + QLIGHTS + QS,APP
619.7042
PROJECT:
LOCATION:
SUBJECT:
DATE:
GIVEN: 21.7884
ROOM DIMENSION = L 8.04 W 2.71 FLR TO FLR
WALL AT WEST SIDE
GLASS DIMENSION = L 8.04 H 2.4
WALL NET AREA = 8.844 SQM
WALL = 6" THICK CHB PLASTERED
TEMP. INSIDE = 24 +/-2˚C
TEMP. OUTSIDE 35 ˚C db / 28.8°C wb
Outdoor Relative Humi
= 64 %
Outdoor Enthalpy = 22.4 Kcal / Kg -da
INDOOR TEMP. = 25 ±2 ºCdb / 19.6°Cwb
ROOM ENTHALPY = 12.6 Kcal/ Kg - da
ACH = 12 REQUIREMENTS
EXTERNAL LOADS
QWALL = UWALL X AWALL X ETDWALL
1.78 X ((3.5*10)-(1.5*10) X 25
393.558 W 8.844
QROOF = UROOF X AROOF X ETDROOF
1.316 5*10 X 0
0W 21.7884
QFLOOR = UFLOOR X AFLOOR X ETDFLOOR
1.2 X 21.7884 X 0
0W
QGLASS = AGLASS X (UGLASS X (TO -
19.296 X 3.12 X 10 +
5580.403 W
HEAT TRANFER DUE TO INFILTRATION
MASSINF = DENSITY OFX (ACH X ROOM VOLUME)
1.095 0.5 52.29216
0.007953
QS,INF = MINF X CPM X (TO -
0.007953 X 1021.6 X 35 -
81.24546 W
QS,INF = MINF X HFG X (WO -
0.007953 2501000 0.0107 -
15.91189 W
INTERNAL LOAD
LOAD DUE TO OCCUPANTS
QS,OCC = NO OF OC X SHG
2X 90
180 W
QL,OCC = NO OF OC X LHG
2X 40
80 W
LOAD DUE TO LIGHTINGS
QLIGHTS = 33 X FLOOR AREA
33 X 21.7884
719.0172 W
LOAD DUE TO APPLIANCE
QS,APP = 2900 W
QL,APP 3000 W
QSTOTAL 9854.224 QWALL + QROOF + QFLOOR +
QLTOTAL 3095.912 QS,INF + QL,OCC + QL,APP
QTOTAL = QSTOTAL + QLTOTAL
12950.14
RSHF = QSTOTAL / QTOTAL
0.760936
REQUIRED COOLING CAPACITY
= QTOTAL * 1.25
16187.67 W
16.18767 Kw
4.604002 TR
SQM/TR 4.732492
PREP ROM 21.7884 4.604002 1.25 5.75500202274815 TR 2302.001 CFM
3.5 CH 2.4
TI) + SHGFMAX X SC)
300 X 0.86
/ 3600
3600
TI)
25
WI)
0.0099
QGLASS + QS,INF + QS,OCC + QLIGHTS + QS,APP
3910.534
PROJECT:
LOCATION:
SUBJECT:
DATE:
GIVEN: 8.4138
ROOM DIMENSION = L 3.79 W 2.22 FLR TO FLR
WALL AT WEST SIDE
GLASS DIMENSION = L 0H 0
WALL NET AREA = 13.265 SQM
WALL = 6" THICK CHB PLASTERED
TEMP. INSIDE = 24 +/-2˚C
TEMP. OUTSIDE 35 ˚C db / 28.8°C wb
Outdoor Relative Humi
= 64 %
Outdoor Enthalpy = 22.4 Kcal / Kg -da
INDOOR TEMP. = 25 ±2 ºCdb / 19.6°Cwb
ROOM ENTHALPY = 12.6 Kcal/ Kg - da
ACH = 12 REQUIREMENTS
EXTERNAL LOADS
QWALL = UWALL X AWALL X ETDWALL
1.78 X ((3.5*10)-(1.5*10) X 25
0 W 0
QROOF = UROOF X AROOF X ETDROOF
1.316 5*10 X 0
0W 8.4138
QFLOOR = UFLOOR X AFLOOR X ETDFLOOR
1.2 X 8.4138 X 0
0W
QGLASS = AGLASS X (UGLASS X (TO -
0X 3.12 X 10 +
0W
HEAT TRANFER DUE TO INFILTRATION
MASSINF = DENSITY OFX (ACH X ROOM VOLUME)
1.095 0.5 20.19312
0.003071
QS,INF = MINF X CPM X (TO -
0.003071 X 1021.6 X 35 -
31.37371 W
QS,INF = MINF X HFG X (WO -
0.003071 2501000 0.0107 -
6.144531 W
INTERNAL LOAD
LOAD DUE TO OCCUPANTS
QS,OCC = NO OF OC X SHG
2X 90
180 W
QL,OCC = NO OF OC X LHG
2X 40
80 W
LOAD DUE TO LIGHTINGS
QLIGHTS = 33 X FLOOR AREA
33 X 8.4138
277.6554 W
LOAD DUE TO APPLIANCE
QS,APP = 620 W
QL,APP 0W
QSTOTAL 1109.029 QWALL + QROOF + QFLOOR +
QLTOTAL 86.14453 QS,INF + QL,OCC + QL,APP
QTOTAL = QSTOTAL + QLTOTAL
1195.174
RSHF = QSTOTAL / QTOTAL
0.927923
REQUIRED COOLING CAPACITY
= QTOTAL * 1.25
1493.967 W
1.493967 Kw
0.424905 TR
SQM/TR 19.80159
PREP ROM 8.4138 0.424905 1.25 0.531131632546573 TR 212.4527 CFM
TOTAL TR 5.765589
3.5 CH 2.4
TI) + SHGFMAX X SC)
300 X 0.86
/ 3600
3600
TI)
25
WI)
0.0099
QGLASS + QS,INF + QS,OCC + QLIGHTS + QS,APP
360.9048
