McQuay M5CK010C, Technical Manual

Page: 31 / 144

2 nd Step:
To obtain the Total capacity and Sensible capacity for
(a) Indoor Condition: 23°C DB , 15°C WB
Outdoor Condition: 35°C DB
Outdoor DB, ˚C
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Indoor DB
˚C
Indoor WB
˚C
TC (kW) SC (kW)
20 15 5.433 2.72
23 15
x
3
y
3
24 15
5.433 4.143
Total capacity, TC
=> = 5.433kW (Same as Total capacity at 20 °C Indoor DB / 15 °C Indoor WB & 35 °C Outdoor WB)*
3
x
Sensible capacity, SC
Interpolation Method:
24°C - 20°C 4.143kW - 2.72kW
=> =
24°C
- 23°C 4.143kW - y
3
=> y
3
= 3.787kW
(b) Indoor Condition: 23°C DB , 15°C WB
Outdoor Condition: 40°C DB
Outdoor DB, ˚C
40 Indoor DB
˚C
Indoor WB
˚C
TC (kW) SC (kW)
20 15 4.918 2.235
23 15 x
4
y
4
24 15 4.918 3.658
Total capacity, TC
=> = 4.918kW (Same as Total capacity at 20 °C Indoor DB / 15 °C Indoor WB & 40 °C Outdoor WB)*
4
x
Sensible capacity, SC
Interpolation Method:
24°C - 20°C 3.685kW - 2.235kW
=> =
24°C
- 23°C 3.685kW - y
1
=> y
4
= 3.302kW
* 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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