Water Volume And Expansion Vessel Pressure; Selection Of Expansion Vessels - Gree EVO S Series Owner's Manual

Mini Chiller

8.4 Water Volume and Expansion Vessel Pressure

Notes:
(a) The expansion vessel is 10 liter and 1bar pre-pressurized;
(b) Total water volume of 280 liter is default; if total water is changed because of installation condition, the pre-pressure
should be adjusted to secure proper operation;
(c) Minimum total water volume is 20 liter;
(d) To adjust pre-pressure, use nitrogen gas by certificated installer.

8.5 Selection of Expansion Vessels

Formula:
V--- Volume of expansion vessel
C--- Total water volume
P --- Pre-set pressure of expansion vessel
1
P -- The highest pressure during running of the system (that is the action pressure of safety valve.)
2
e---The expansion factor of water (the difference between the expansion factor of the original water temperature
and that of highest water temperature.)
Temperature
2.5
2.0
1.5
1.0
0.5
0.0
0 50 100 150
Maximum total water volume(liter)
Water expansion factor in different temperature
( )
℃
0
4
10
20
30
40
45
50
55
60
65
70
75
80
85
90
95
100
200 250 300 350
Expansion factor e
19
400
0.00013
0
0.00027
0.00177
0.00435
0.00782
0.0099
0.0121
0.0145
0.0171
0.0198
0.0227
0.0258
0.029
0.0324
0.0359
0.0396
0.0434
eries