16
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
Total capacity, TC
⇒
x
3
= 7.657kW
(Same as Total capacity at 20
°C
Indoor DB / 15
°C
Indoor WB & 35
°C
Outdoor WB)*
Sensible capacity, SC
Interpolation Method:
⇒
⇒
y
3
= 5.446kW
(b) Indoor Condition:
23°C DB
, 15°C WB
Outdoor Condition:
40°C DB
Total capacity, TC
⇒
x
4
= 6.832kW
(Same as Total capacity at 20
°C
Indoor DB / 15
°C
Indoor WB & 40
°C
Outdoor WB)*
Sensible capacity, SC
Interpolation Method:
⇒
⇒
y
4
= 4.685kW
*
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
24°C - 20°C
=
5.915kW - 4.039kW
24°C - 23°C 5.915kW - y
3
24°C - 20°C
=
5.154kW - 3.278kW
24°C - 23°C 5.154kW - y
4
Indoor DB
Indoor WB
° C
° C
TC (kW)
SC (kW)
20
15
7.657
4.039
23
15
x
3
y
3
24
15
7.657
5.915
Outdoor DB ° C
35
Indoor DB
Indoor WB
° C
° C
TC (kW)
SC (kW)
20
15
6.832
3.278
23
15
x
4
y
4
24
15
6.832
5.154
Outdoor DB ° C
40