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18 TRG-TRC016-EN
notes
period one
Types of Water Chillers
Equipment Rating Standards
The Air-Conditioning & Refrigeration Institute (ARI) establishes rating standards
for packaged HVAC equipment. ARI also certifies and labels equipment through
programs that involve random testing of a manufacturer’s equipment to verify
published performance. These equipment rating standards have been
developed to aid engineers in comparing similar equipment from different
manufacturers. Chiller full-load efficiency is described in terms of kW/ton and
coefficient of performance (COP). Additionally, two efficiency values developed
by ARI that are receiving increased attention are the Integrated Part-Load
Value (IPLV) and Non-Standard Part-Load Value (NPLV).
ARI’s part-load efficiency rating system establishes a single number to estimate
both the full- and part-load performance of a stand-alone chiller. As part of ARI
Standard 550/590–1998, Water-Chilling Packages Using the Vapor-Compression
Refrigeration Cycle, and ARI Standard 560–1992, Absorption Water Chilling-
Heating Packages, chiller manufacturers may now certify their chiller part-load
performance using the IPLV and NPLV methods. This gives the engineering
community an easy and certified method to evaluate individual chillers.
Understanding the scope and application limits of IPLV and NPLV is, however,
crucial to their validity as system performance indicators.
Equipment Rating Standards
▲ Air-Conditioning &
Refrigeration Institute (ARI)
◆ Standard 550/590–1998:
centrifugal and helical-rotary
water chillers
◆ Standard 560–1992:
absorption water chillers
Figure 21