McQuay MWM 007F

13
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
35
Indoor DB
°C
Indoor WB
°C
TC (kW) SC (kW)
20 15 2.506 1.363
23 15 x
3
y
3
24 15 2.506 1.931
Total capacity, TC
⇒
3
x = 2.506kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 35°C Outdoor WB)*
Sensible capacity, SC
Interpolation Method:
⇒
3
ykW931.1
1.363kWkW931.1
C23C24
C20C24
−
−
=
−°
−
°
°°
⇒
3
y = 1.789kW
(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 2.311 1.205
23 15 x
4
y
4
24 15 2.311 1.773
Total capacity, TC
⇒
4
x = 2.311kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 40°C Outdoor WB)*
Sensible capacity, SC
Interpolation Method:
⇒
4ykW773.1
1.205kWkW773.1
C23C24
C20C24
−
−
=
−°
−
°
°°
⇒
4
y = 1.631kW
* 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