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(5) Selection chart
Correct the cooling and heating capacity in accordance with the conditions as follows. The net cooling and heating capacity can be
obtained in the following way.
Net capacity = Capacity shown on specification ✕ Correction factors as follows.
(a) Coefficient of cooling and heating capacity in relation to temperatures
(b) Correction of cooling and heating capacity in relation to one way length of refrigerant piping
It is necessary to correct the cooling and heating capacity in relation to the one way piping length between the indoor and outdoor
units.
Piping length [m]
Cooling
Heating
(c) Correction relative to frosting on outdoor heat exchanger during heating
In additions to the foregoing corrections (a), (b) the heating capacity needs to be adjusted also with respect to the frosting on the
outdoor heat exchanger.
Air inlet temperature of
outdoor unit in ˚C WB
Adjustment coefficient
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model SRK20ZD-S1 with the piping length of 15m, indoor wet-bulb temperature at 19.0˚C
and outdoor dry-bulb temperature 35˚C is Net cooling capacity =
1.3
1.2
Cooling
1.1
1.0
0.9
0.8
0.7
0.6
43
40
35
30
25
21
Indoor air W.B. temperature ˚C W.B.
27
25
20
15
-5
Outdoor air W.B. temperature ˚C W.B.
7
10
1.0
0.99
1.0
1.0
-5
-3
0.91
0.88
Heating
Applicable range
16
18
20
ISO-T1 Standard Condition
0
5
10
ISO-T1 Standard Condition
15
20
25
0.975
0.965
0.95
1.0
1.0
1.0
-1
1
3
5
0.86
0.87
0.92
1.00
✕
2000
SRK20ZD-S1
Length 15m
11
-
-
22
24
20
15
✕
0.975
1.0
=
Factor by air
temperatures
1950 W
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