
Details:
1
st
Step:
To obtain the Total capacity and Sensible capacity for
(a) Indoor Condition: 24°C DB, 15°C WB
Outdoor Condition: 35°C DB
Outdoor DB, ˚C
35
Indoor DB
˚C
Indoor WB
˚C
TC (kW) SC (kW)
15
x
1
y
1
16
5.597 4.008
24
17
5.761 3.873
Total capacity, TC
=> = 5.433kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 35°C Outdoor WB)*
1
x
Sensible capacity, SC
Extrapolation Method:
17°C - 15°C 3.873kW - y
1
=> =
17°C - 15°C 3.873kW - 4.008kW
=>y
1
= 4.143kW
(b) Indoor Condition: 24°C DB, 15°C WB
Outdoor Condition: 40°C DB
Outdoor DB, ˚C
40
Indoor DB
˚C
Indoor WB
˚C
TC (kW) SC (kW)
15
x
2
y
2
16
5.066 3.536
24
17
5.214 3.414
Total capacity, TC
=> = 4.918kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 40°C Outdoor WB)*
2
x
Sensible capacity, SC
Extrapolation Method:
17°C - 15°C 3.414kW - y
2
=> =
17°C - 16°C 3.414kW - 3.536kW
=> y
2
= 3.658kW
* This is due to 2 different conditions with same WB temperature, will have the same level of enthalpy. For
more details, please refer to psychrometrics chart
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