Mitsubishi Heavy Industries SCM71ZM-S1 Technical Manual page 138

6. SELECTION CHARTS
6. SELECTION CHARTS
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.
Piping length [m]
Cooling
Heating
(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.
Air inlet temperature of
outdoor unit in ℃WB
Adjustment coefficient
How to obtain the cooling and heating capacity
Example : The net cooling capacity of the model SCM80ZM-S1 (SRK25ZSX-S : 4 units) with the piping length of 10m, indoor
wet-bulb temperature at 19.0℃ and outdoor dry-bulb temperature 35℃ is
Net cooling capacity =
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6
43
40
35
30
25
20
0
-5
-10
-15
Indoor air WB temperature℃WB
30
25
20
15
10
-15 -10 -5
Outdoor air WB temperature℃WB
7 10 15 20
1.0 0.99 0.975 0.965
1.0 1.0 1.0 1.0
-15 -10
0.95 0.95
( 1.98 × 4 ) × 0.99
Table of indoor unit combnation (Refer to pege 130)
Outdoor unit SCM80ZM-S1
Indoor unit SRK25ZSX-S × 4 units
Cooling
Heating
Applicable range
Depends on installed situation
14 16 18 20
ISO-T1 Standard Condition
0 5
ISO-T1 Standard Condition
25
0.95
1.0
-9 -7 -5 -3
0.94 0.93 0.91 0.88
× 1.0 ≒ 7.84kW
Factor by air
temperatures
Length 10m
137
- -
'17 • SCM-T-225
26
24
22
10 15
-1 1 3
or more
0.86 0.87 0.92 1.00
5