
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 5.055 2.775
23 15 x
3
y
3
24 15 5.055 3.887
Total capacity,
TC
⇒
3
x
= 5.055kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 35°C Outdoor WB)*
Sensible capacity, SC
Interpolation Method:
⇒
3
ykW887.3
2.775kWkW887.3
C23C24
C20C24
−
−
=
−°
−
°
°°
⇒
3
y = 3.603kW
(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 4.575 2.334
23 15 x
4
y
4
24 15 4.575 3.447
Total capacity,
TC
⇒
4
x
= 4.575kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 40°C Outdoor WB)*
Sensible capacity, SC
Interpolation Method:
⇒
1
ykW447.3
2.334kWkW447.3
C23C24
C20C24
−
−
=
−°
−
°
°°
⇒
4
y
= 3.169kW
* 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
92
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