McQuay MWM009J

36
MWM-J-2009 Performance Data
Calculation Steps
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
Indoor DB˚C Indoor WB˚C
Outdoor DB, ˚C
35
TC (kW) SC (kW)
........ ........
24
15
...........................................
x
1
y
1
16 2.401 1.727
17 2.434 1.640
Total capacity, TC
⇒ x
1
= 2.368kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 35°C Outdoor WB)*
Sensible capacity, SC
Extrapolation Method:
⇒
17º C – 15º C
=
1.640kW – y
1
17º C – 16º C 1.640kW – 1.727kW
⇒ y
1
= 1.814kW
(b) Indoor Condition: 24°C DB, 15°C WB
Outdoor Condition: 40°C DB
Indoor DB˚C Indoor WB˚C
Outdoor DB, ˚C
40
TC (kW) SC (kW)
........ ........
24
15
...........................................
x
2
y
2
16 2.174 1.538
17 2.218 1.479
Total capacity, TC
⇒ x
2
= 2.131kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 40°C Outdoor WB)*
Sensible capacity, SC
Extrapolation Method:
⇒
17º C – 15º C
=
1.479kW – y
2
17º C – 16º C 1.479kW – 1.538kW
⇒ y
2
= 1.597kW
* 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
08_Performance Data.indd 3608_Performance Data.indd 36 3/4/2009 11:29:34 AM3/4/2009 11:29:34 AM