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54 TRG-TRC011-EN
notes
period five
Application Considerations
Cooling-Water Temperature Limitations
The temperature of the cooling water significantly impacts the operation of an
absorption chiller. As the temperature of the entering-cooling-water decreases,
chiller capacity increases.
Some absorption chiller designs can experience operational problems if the
cooling-water temperature changes too rapidly or becomes too low. If the
temperature of the cooling water changes too rapidly, there is potential for the
absorbent solution to carry over from the generator into the condenser. This
increases the risk of corrosion in the condenser and evaporator sections of the
chiller, and reduces the cooling capacity of the chiller. Additionally, low cooling-
water temperatures increase the risk of crystallization. When applying these
chillers, a cooling tower bypass is typically recommended for stable control of
the cooling-water temperature.
In some new chiller and control designs, variable-speed drives are used to vary
the flow of solution through the chiller, allowing the chiller to maintain tight
control in situations where the cooling-water temperature may be highly
variable. In many cases, this means that a cooling tower bypass may not be
required, although this should be verified by the system designer. In
applications that require tight control of the leaving-chilled-water temperature,
however, it is still generally recommended to design the system to minimize the
rate at which the cooling-water temperature varies.
In all cases, the chiller manufacturer should be consulted for specific cooling-
water temperature limitations and control requirements.
condenser
condenser
bypass
bypass
cooling tower
cooling tower
diverting
diverting
valve
valve
Figure 62