Daikin F Series Technical Manual page 27

Details of Calculation:
1 Step:
st
To obtain the TC, SC & PI for
(a) Indoor Condition: 25°C DB, 16°C WB
Outdoor Condition: 35°C DB
EWB EDB
24
16 25
27
(b) Indoor Condition: 25°C DB, 19°C WB
Outdoor Condition: 35°C DB
EWB EDB
24
19 25
27
Repeat the same process for (c) & (d) in 1
(c) x = 1.69 kW; y = 1.63 kW; z
3 3
2 Step:
nd
To obtain the TC, SC & PI for
(a) Indoor Condition: 25°C DB, 17°C WB
Outdoor Condition: 35°C DB
EWB EDB
16
17 25
19
Repeat the same process for (b) in 2
(c) x = 1.74 kW; y = 1.52 kW; z
6 6
Outdoor temperature
35°C
TC SC PI
1.80 1.71 0.63
x y z
1 1 1
1.83 1.83 0.63
Outdoor temperature
35°C
TC SC PI
1.99 1.32 0.64
x y z
2 2 2
1.99 1.53 0.64
Step
st
= 0.68 kW
3
Outdoor temperature
35°C
TC SC PI
1.81 1.75 0.63
x y z
5 5 5
1.99 1.39 0.64
Step
nd
= 0.68 kW
6
By Interpolation Method
25°C – 24°C
⇒
27°C – 24°C
⇒ x = 1.81kW
1
Similarly,
y = 1.75kW
1
z = 0.63kW
1
By Interpolation Method
25°C – 24°C
⇒
27°C – 24°C
⇒ x = 1.99kW
2
Similarly,
y = 1.39kW
2
z = 0.64kW
2
(d) x = 1.83 W; y = 1.30 kW; z
4 4
By Interpolation Method
17°C – 16°C
⇒
19°C – 16°C
⇒ x = 1.87kW
5
Similarly,
y = 1.63kW
5
z =0.63kW
5
Performance Data
x – 1.80kW
1
=
1.83kW – 1.80kW
x – 1.99kW
2
=
1.99kW – 1.99kW
= 0.69 kW
4
x – 1.81kW
5
=
1.99kW – 1.81kW
25