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TRG-TRC010-EN 41
period five
Application Considerations
notes
Short water loops may be unavoidable in close-coupled or very small
applications, particularly in systems where the load consists of only a few air
handlers or processes.
To prevent the effect of a short water loop, a storage tank or large header pipe
can be added to the system to increase the volume of water in the loop and
ensure a slowly changing return water temperature.
A second solution is to reduce the water flow rate in the chilled water loop
while using the same size pipes. This also increases the loop time—the time it
takes a particle of water to travel through the chilled water loop—and ensures
that the return water temperature changes slowly. This solution has the added
benefit of reduced pumping energy requirements.
Short Evaporator-Water Loops
load
load
chilled
chilled
water
water
pump
pump
evaporator
evaporator
tank
tank
Figure 57
trgtrc010_book.book Page 41 Wednesday, September 1, 1999 10:42 AM