ClimaCool IOM FLEX SERIES - Manual (Page 16)

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14
CONDENSER WATER
TEMPERATURE REQUIREMENTS
Requirements
As a general rule the efficiency of the chiller increases as
the condenser water temperature is lowered. The expansion
valve, however, relies on the pressure difference across the
valve to drive the liquid refrigerant through. It is necessary
to maintain a minimum pressure differential across the
thermal expansion valve (equivalent to a 30°F difference
between saturated liquid temperature in the condenser and
saturated vapor temperature in the evaporator). This pressure
differential is most commonly ensured by cycling the fans on
the cooling tower to maintain the entering condenser water
temperature above the minimum temperature of 65°F. An alternate method to maintain the minimum entering
condenser water temperature above 65°F is to employ a
bypass arrangement as show in Fig. 1 below. This valve is an
automatic 3-way bypass valve, which senses the temperature
of the mixed water entering the condenser. If this mixed
water temperate falls below 65°F the valve will recirculate
the leaving condenser water and mix it into the entering
condenser water stream (bypassing the cooling tower).
Condenser Water Temp. Requirements
Fig. 1 - Condenser Water System