Interpolation and Extrapolation method can be used to get the total capacity, TC and sensible capacity, SC at
those temperatures which are not stated out in the table.
EXAMPLE:
Model: RCM 20D– ALC 18C
Indoor Condition: 23°C DB, 15°C WB
Outdoor Condition: 37°C DB
Solution:
Overall
Based on the Performance table on Pg.70
1. Refer to the Indoor DB column,
-
23°C is located between 20°C and 24°C (Thus, Interpolation need to be applied)
2. Refer to the Indoor WB column,
-
15°C only available in the case of Indoor DB = 20°C. (Thus, Extrapolation between 16°C WB
and 17°C WB during 24°C indoor DB is required)
3. Refer to the Outdoor DB column,
-
37°C is located between 35°C and 40°C. (Thus, Interpolation need to be applied)
Please follow the steps below in order to get the required capacity.
st
1
Step
Extrapolation of Indoor WB
Find TC, SC for
15°C WB
(a) Indoor: 24°C DB,
Outdoor: 35°C DB
15°C WB
(b) Indoor: 24°C DB,
Outdoor: 40°C DB
6. PERFORMANCE DATA
nd
2
Step
Interpolation of Indoor DB
Find TC, SC for
(a) Indoor:
Outdoor: 35°C DB
(b) Indoor:
Outdoor: 40°C DB
23°C DB
, 15°C WB
23°C DB
, 15°C WB
66
rd
3
Step
Interpolation of Outdoor DB
Find TC, SC for
(a) Indoor: 23°C DB, 15°C WB
37°C DB
Outdoor: