McQuay M5WM 007G, Manual

Page: 19 / 118

17
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
Total capacity, TC
⇒
3
x = 2.560kW (Same as Total capacity at 20 °C Indoor DB / 15 °C Indoor WB & 35 °C Outdoor WB)*
Sensible capacity, SC
Interpolation Method:
⇒
⇒
y
3
= 1.839kW
(b) Indoor Condition: 23°C DB , 15°C WB
Outdoor Condition: 40°C DB
Total capacity, TC
⇒
4
x = 2.356kW (Same as Total capacity at 20 °C Indoor DB / 15 °C Indoor WB & 40 °C Outdoor WB)*
Sensible capacity, SC
Interpolation Method:
⇒
⇒
y
4
= 1.651kW
* 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
24°C - 20°C
=
1.985kW - 1.398kW
24°C - 23°C 1.985kW - y
3
24°C - 20°C
=
1.797kW - 1.211kW
24°C - 23°C 1.797kW - y
4
Indoor DB Indoor WB
° C ° C TC (kW) SC (kW)
20 15
2.560 1.398
23 15 x
3
y
3
24 15 2.560 1.985
Outdoor DB ° C
35
Indoor DB Indoor WB
° C ° C TC (kW) SC (kW)
20 15 2.356 1.211
23 15
x
4
y
4
24 15
2.356 1.797
Outdoor DB ° C
40