
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
Outdoor DB, °C
35
Indoor DB
°C
Indoor WB
°C
TC (kW) SC (kW)
15 x
1
y
1
16 5.238 3.695
24
17 5.421 3.503
Total capacity,
TC
⇒
1
x
= 5.055kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 35°C Outdoor WB)*
Sensible capacity, SC
Extrapolation Method:
⇒
3.695kWkW503.3
ykW503.3
C16C17
C15C17
1
−
−
=
−°
−
°
°°
⇒
1
y
= 3.887kW
(b) Indoor Condition: 24°C DB, 15°C WB
Outdoor Condition: 40°C DB
Outdoor DB, °C
40
Indoor DB
°C
Indoor WB
°C
TC (kW) SC (kW)
15 x
2
y
2
16 4. 741 3. 273
24
17 4.907 3.099
Total capacity,
TC
⇒
2
x = 4.575kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 40°C Outdoor WB)*
Sensible capacity, SC
Extrapolation Method:
⇒
3.273kW3.099kW
ykW099.3
C16C17
C15C17
2
−
−
=
−°
−
°
°°
⇒
2
y
= 3.447kW
* 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
91
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