Midea MWSC340A-FB3 - Page 81

Flooded type water cooled screw chiller (PCB Control)
80
Ethylene and Propylene Glycol Factors
A glycol solution is required when the unit with condition as mentioned. The use of glycol will reduce
the performance of the unit depending on concentration.
Ethylene Glycol
Ethylene
glycol
Evaporator side
Quality of
glycol（%）
Cooling
capacity
modification
Power
modification
Water flow
modification
Water
resistance
Freezing
point ℃
30
0.972
0.99
1.013
1.215
-16
35
0.971
0.984
1.04
1.267
40
0.965
0.977
1.074
1.325
-23
45
0.96
0.967
1.121
1.389
50
0.946
0.955
1.178
1.458
-35
Condenser side
30
0.991
1.02
1.013
1.164
-16
35
0.989
1.027
1.04
1.212
40
0.986
1.032
1.074
1.261
-23
45
0.984
1.037
1.121
1.309
50
0.98
1.044
1.178
1.362
-35
Note: the freezing point not shown here, please calculate according to interpolation method.
Propylene Glycol
Propylene
glycol
Evaporator side
Quality of
glycol
（%）
Cooling
capacity
modification
Power
modification
Water flow
modification
Water
resistance
Freezing
point ℃
30
0.968
0.969
1.01
1.16
-13
35
0.964
0.955
1.028
1.287
40
0.955
0.937
1.05
1.4
-21
45
0.945
0.914
1.078
1.502
50
0.929
0.89
1.116
1.604
-33
Condenser side
30
0.969
1.023
1.01
1.227
-13
35
0.959
1.029
1.028
1.276
40
0.944
1.039
1.05
1.329
-21
45
0.923
1.054
1.078
1.388
50
0.896
1.078
1.116
1.453
-33
Note: the freezing point not shown here, please calculate according to interpolation method.
Units operating with glycol solutions are not included in the ARI Certification Program.
Altitude correction factors
Performance tables are based at sea level. Elevations other than sea level affect the performance of
the unit. The decreased air density will reduce condenser capacity and reduce the unit’s
performance. For performance at elevations other than sea level refer to below table Maximum
allowable altitude is 1800 meters.