12
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 2.582 1.835
24
17 2.659 1.739
Total capacity, TC
=>
1
x = 2.506kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 35°C Outdoor WB)*
Sensible capacity, SC
Extrapolation Method:
=>
1.835kWkW739.1
ykW739.1
C16C17
C15C17
1
−
−
=
−°
−
°
°°
=>
1
y = 1.931kW
(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 2.378 1.699
24
17 2.444 1.625
Total capacity, TC
=>
2
x = 2.311kW (Same as Total capacity at 20°C Indoor DB / 15°C Indoor WB & 40°C Outdoor WB)*
Sensible capacity, SC
Extrapolation Method:
=>
1.699kW1.625kW
ykW625.1
C16C17
C15C17
2
−
−
=
−°
−
°
°°
=>
2
y = 1.773kW
* 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
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