McQuay M5WM 007G, Manual

Page: 18 / 118

16
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
Total capacity, TC
⇒
1
x = 2.560kW (Same as Total capacity at 20 °C Indoor DB / 15 °C Indoor WB & 35 °C Outdoor WB)*
Sensible capacity, SC
Extrapolation Method:
⇒
⇒
y
1
= 1.985kW
(b) Indoor Condition: 24°C DB, 15°C WB
Outdoor Condition: 40°C DB
Total capacity, TC
⇒
2
x = 2.356kW (Same as Total capacity at 20 °C Indoor DB / 15 °C Indoor WB & 40 °C Outdoor WB)*
Sensible capacity, SC
Extrapolation Method:
⇒
⇒
y
2
= 1.797kW
* 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
17°C - 15°C
=
1.790kW - y
1
17°C - 16°C 1.790kW - 1.888kW
17°C - 15°C
=
1.649kW - y
2
17°C - 16°C 1.649kW - 1.723kW
Indoor DB Indoor WB
° C ° C TC (kW) SC (kW)
15
x
1
y
1
16 2.624 1.888
17 2.688 1.790
Outdoor DB ° C
35
24
Indoor DB Indoor WB
° C ° C TC (kW) SC (kW)
15
x
2
y
2
16 2.429 1.723
17
2.503 1.649
40
24
Outdoor DB ° C