Selection of a Refrigeration System for a Given Temperature Level and Heat Load
In general, the simplest system is selected for any specific refrigeration requirement, because it should be the least expensive from first cost and operating cost viewpoints. Factors that are weighed in arriving at the process-directed refrigeration system, in addition to the purchase and operating costs:
1. Temperature Level of Evaporating Refrigerant
Refrigerant temperatures greater than 32°F (0°C) suggest the steam jet or lithium bromide absorption system. Between 30°F and −40°F (−1.1°C and −40°C), the ammonia-water absorption or a mechanical compression system is indicated. At less than −40°F (−40°C), mechanical compression is used, except in special desiccant situations. ...