Water Flow - Midea LSBLG MCF Series Technical & Service Manual

Flooded type water cooled screw chiller (MIC)
7.

Water flow

Balance the chilled water flow through the evaporator and the condenser water flow through the
condenser. The flow rates must fall between the minimum and maximum values shown in the table
below. Flow rates below the minimum values shown will result in laminar flow which will reduce
efficiency, cause erratic operation of the electronic expansion valve and cause low temperature cutouts.
On the other hand, flow rates exceeding the maximum values shown can cause erosion on the heat
exchanges water connections and tubes, even piping breaking.
Variable chilled water flow through the heat exchanges while the compressor(s) are operating is not
recommended. The chiller control set points are based upon a constant flow and variable temperature.
Model
LSBLG340/MCF
LSBLG440/MCF
LSBLG540/MCF
LSBLG720/MCF
LSBLG805/MCF
LSBLG890/MCF
LSBLG1055/MCF
LSBLG1200/MCF
LSBLG1300/MCF
LSBLG1410/MCF
LSBLG1620/MCF
LSBLG1780/MCF
Pressure drop
Evaporator
Water pressure drop curve(evaporator)
60
50
40
30
20
10
0
0.0 50.0
Evaporator water flow rate
Rated Minimum
58 29
76 38
93 46
124 62
138 69
153 77
182 91
206 103
224 112
243 122
279 142
306 153
100.0 150.0
3
Water flow(m /h)
3
m /h
Condenser water flow rate
Maximum Rated
64 73
83 95
102 116
138 155
152 173
168 191
200 227
227 258
246 280
267 303
312 348
337 383
200.0 250.0
22
MCAC-CTSM-2018-1
3
m /h
Minimum Maximum
37 80
47 104
58 128
74 173
87 190
96 210
113 250
129 284
140 308
152 333
177 390
191 421
LSBLG340/MCF
LSBLG440/MCF
LSBLG540/MCF
LSBLG720/MCF
LSBLG805/MCF
LSBLG890/MCF
LSBLG1055/MCF