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4.4 - exhibit Le (cont.)
4.4.4 - Cooling water temperature control
Fig. 19 - example for cooling water entering temperature of 29.4°C
1
8
2
3
Legend
1
From chiller/heater
2
to chiller/heater
3
Cooling water pump
4
Constant flow blow-down valve
5
Cooling tower
6
bypass valve
7
Water supply
8
Cooling water thermostat
Case A
Absorption chillers are designed to operate with a cooling
water entering temperature above 18°C. In typical applications
the chiller is selected on the basis of the cooling water
temperature available at full load. This is 29.4°C.
During operation of the chiller/heater keep the cooling water
entering temperature between 29.4°C and 18°C.
During start-up however, a lower temperature is allowable until
the operating conditions are reached.
NOTES
1.
Be sure to start and stop the fan by means of the cooling
water thermostat.
2.
Provide a bypass valve in order to control the cooling
water entering temperature properly.
0
A
4
5
7
14
6
9
10
15
MV
1
11
2
13
9
Dosing pump
10 Chemical tank
11 Cooling water pump
12 Cooling water thermostat for cooling tower fan
13 Cooling water thermostat for three-way control valve
14 blow-down
15 Automatic three-way control valve
Case B
If the chiller operates during an intermediate season or in
winter, provide an automatic three-way control valve shown as
above.
B
4
5
14
7
9
12
10
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