15
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
Total capacity, TC
⇒
x
1
= 7.657kW
(Same as Total capacity at 20
°C
Indoor DB / 15
°C
Indoor WB & 35
°C
Outdoor DB)*
Sensible capacity, SC
Extrapolation Method:
⇒
⇒
y
1
= 5.915kW
(b) Indoor Condition:
24°C DB,
15°C WB
Outdoor Condition:
40°C DB
Total capacity, TC
⇒
x
2
= 6.832kW
(Same as Total capacity at 20
°C
Indoor DB / 15
°C
Indoor WB & 40
°C
Outdoor DB)*
Sensible capacity, SC
Extrapolation Method:
⇒
⇒
y
2
= 5.154kW
*
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
17
°C - 15°C
=
5.213kW - y
1
17°C - 16°C 5.213kW - 5.564kW
17
°C - 15°C
=
4.614kW - y
2
17°C - 16°C 4.614kW - 4.884kW
Indoor DB
Indoor WB
° C
° C
TC (kW)
SC (kW
15
x
1
y
1
16
7.739
5.564
17
7.822
5.213
Outdoor DB ° C
35
24
Indoor DB
Indoor WB
° C
° C
TC (kW)
SC (kW)
15
x
2
y
2
16
6.939
4.884
17
7.045
4.614
Outdoor DB ° C
40
24