Capacity Calculation Due To Capacity Modification Coefficient - Airwell VVFA Series Service Manual

6. Capacity Calculation Due to Capacity Modification Coefficient

(1) Calculation method of refrigerating capacity----cooling capacity to be known=refrigerating
capacity*(A*B*C*D*E)W
A. Capacity compensation value of indoor
air wet-bulb temperature condition
1.2
1.1
1.0
0.9
0.8
15 20
Indoor air wet-bulb temperature (°C )
C. Capacity modification value under airflow variation
rate of indoor unit group (only for duct unit)
1.1
1.0
0.9
80 90 100
Airflow variation rate (%)
E. Capacity compensation value of pipe length, pipe diameter and height drop
Notes for E:
Notes for E:
(1) The main pipe (from outdoor to the first branch pipe) diameter should be enlarged one size
when the single way pipe length is over 90m.
(1) The mian pipe (from outdoor to the first branch pipe) diameter should be enlarged one size
(2) When in cooling mode, outdoor is lower than indoor; or when in heating mode, outdoor is higher than indoor, the
when the single way pipe length is over 90m.
compensation factor should be decreased the below value from figure E.
(2) When in cooling mode, outdoor is lower than indoor; or when in heating mode, outdoor is higher than indoor, the
compensation factor should be decreased the below value from figure E.
Vertical height drop between
indoor and outdoor
Adjustment factor
24
110 120
5m 10m 15m
0.003 0.006 0.009 0.012 0.015 0.018 0.021 0.024 0.027
B. Capacity compensation value of outdoor
air dry-bulb temperature condition
1.2
1.1
1.0
0.9
-5 0 5 10
Outdoor air dry-bulb temperature (°C )
D. Capacity compensation suitable for
total capability of indoor unit group
120
100
80
60
40
20
0 20
Total capacity of indoor unit group (%)
20m 25m 30m 35m
12
15 20 25 30
40 60 80 100 120 130
40m 45m 50m
0.03
35 40 43