-
9
-
2.5 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.
(1)
Coefficient of cooling and heating capacity in relation to temperatures
(2)
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.
(3)
Correction relative to frosting on outdoor heat exchanger during heating
In additions to the foregoing corrections (1), (2) the heating capacity needs to be adjusted also with respect to the frosting on the
outdoor heat exchanger.
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model SRK20ZG-S 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 = 2000
✕
0.975
✕
1.0
=
1950 W
Length 15m
Factor by air
temperatures
Piping length [m]
Cooling
Heating
7
1.0
1.0
10
0.99
1.0
15
0.975
1.0
20
0.965
1.0
25
0.95
1.0
SRK20ZG-S
Cooling
Heating
22
20
18
16
14
0.6
0.7
0.8
0.9
1.0
1.2
1.1
1.3
0
-5
-10
-15
Applicable range
Depends on installed situation
24
26
20
25
30
35
40
46
10
15
20
25
27
Outdoor air W.B. temperature ˚C W.B.
-15
-10
-5
0
5
10
15
Indoor air W.B. temperature ˚C W.B. ISO-T1 Standard Condition
Cooling operation
Outdoor air D.B.
temperature
˚CD. B.
Coefficient of cooling
&
Heating capacity in
relation to temperature
Heating operation
Indoor air D.B.
temperature
˚CD. B.
ISO-T1 Standard Condition
Air inlet temperature of
outdoor unit in ˚C WB
Adjustment coefficient
-10
0.95
-9
0.94
-7
0.93
-5
0.91
-3
0.88
-1
0.86
1
0.87
3
0.92
5
1.00
