Single Stage vs. Two Stage Ammonia Refrigeration Systems
Single Stage vs. Two Stage Ammonia Refrigeration Systems (2000)-The design of any refrigeration system should be driven by economic factors. Open drive systems almost always have a lower life cycle cost than unitary systems for moderately sized and larger applications. Ammonia systems generally have a lower life cycle cost than do R-22 or other alternate refrigerants within a reasonable regulatory environment. The selection of a single stage economized system or a two stage system should likewise be driven by economic factors. Generally speaking, the single stage economized system works best for just about all applications at -25°F SST or higher and on smaller systems even down to -40°F SST. Conversely, two stage systems will work best on larger systems at suction temperatures below -25°F.
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