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20 TRG-TRC016-EN
notes
period one
Types of Water Chillers
The standard rating conditions used for ARI certification represent a particular
set of design temperatures and flow rates for which water-cooled and air-cooled
systems may be designed. They are not suggestions for good design practice
for a given system—they simply define a common rating point to aid
comparisons.
In fact, concerns toward improved humidity control and energy efficiency have
changed some of the design trends for specific applications. More commonly,
chilled-water systems are being designed with lower chilled-water
temperatures and lower flow rates. The water flow rate required through the
system is decreased by allowing a larger temperature difference through the
chiller.
chiller type
evaporator
flow rate
vapor-compression
• reciprocating
•scroll
• helical-rotary
• centrifugal
2.4 gpm/ton
[0.043 L/s/kW]
absorption
• single-effect
• double-effect,
indirect-fired
• double-effect,
direct-fired
Standard Rating Conditions
condenser
flow rate
3.0 gpm/ton
[0.054 L/s/kW]
2.4 gpm/ton
[0.043 L/s/kW]
3.6 gpm/ton
[0.065 L/s/kW]
2.4 gpm/ton
[0.043 L/s/kW]
4.0 gpm/ton
[0.072 L/s/kW]
rating
standard
ARI
550/590–1998
ARI
560–1992
water leaving evaporator = 44°F [6.7°C]
water entering condenser = 85°F [29.4°C]
4.5 gpm/ton
[0.081 L/s/kW]
Figure 23