76
ACK-E-2009
Performance Data
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
Indoor DB
˚
C
Indoor WB
˚
C
Outdoor DB,
˚
C
35
TC (kW)
SC (kW)
........
........
20
15
...........................................
5.343
2.925
23
15
x
3
y
3
24
15
5.343
4.17
Total capacity, TC
⇒
x
3
= 3.295kW
(Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 35°C Outdoor WB)
*
Sensible capacity, SC
Interpolation Method:
⇒
24º C – 20º C
=
4.17kW – 2.925kW
24º C – 23º C
4.17kW – y
3
⇒
y
1
= 3.859kW
(b) Indoor Condition:
23°C DB, 15°C WB
Outdoor Condition:
40°C DB
Indoor DB
˚
C
Indoor WB
˚
C
Outdoor DB,
˚
C
40
TC (kW)
SC (kW)
........
........
20
15
...........................................
4.828
2.477
23
15
x
4
y
4
24
15
4.828
3.721
Total capacity, TC
⇒
x
4
= 4.828kW
(Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 40°C Outdoor WB)
*
Sensible capacity, SC
Interpolation Method:
⇒
24º C – 20º C
=
3.721kW – 2.477kW
24º C – 23º C
3.721kW – y
4
⇒
y
2
= 3.41kW
*
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_A.indd 76
08_Performance Data_A.indd 76
4/6/2009 11:14:02 AM
4/6/2009 11:14:02 AM