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BTU/hr. 5 psig 22,100 Figures 3-6 and 3-7 illustrate typical two-stage compressors as applied to low temperature systems. Two-stage refrigeration is effective down to evaporator temperatures of -80°F. Below that level, efficiency drops off rapidly. For additional application and service information on internally compound compressors, refer to Application Engineering Bulletin AE 19-1132. R‑507 Evap. Temp. Suction Line Pressure Drop Pressure at Comp. BTU/hr. Capacity -10°F 1 psi 24 psig 40,400 -10°F 2 psi 23 psig 39,400 -10°F 3 psi 22 psig 37,400 -10°F 4 psi 21 psig 35,500 EXTERNALLY COMPOUND SYSTEMS Two stage compression can be accomplished with the use of two compressors.

Table 3-1 Liquid Line Pressure Drop Heat entering the refrigerant through the suction line from the ambient air outside the refrigerated space results in a net loss of system capacity. These losses may be as high as 10% to 15%. Insulation of the suction line is a worthwhile investment, and may be necessary to prevent the return gas temperature from rising too high. This will also prevent the compressors discharge temperature from rising too high. Press Drop (psig) Refrig. Press Drop (psig) Refrig.

The externally compound system can have compressors in parallel in either or both stages of the system. Compressors can have unloaders. Parallel compressors in both stages can be turned on and off to meet the demands of the low temperature and interstage pressures. System With 6-Cylinder Compressor (Without Liquid Sub-Cooler) Figure 3-6 © 1968 Emerson Climate Technologies, Inc. All rights reserved. 3-7 System With 6-Cylinder Compressor (With Sub-Cooler) Figure 3-7 3-8 © 1968 Emerson Climate Technologies, Inc.

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Copeland Refrigeration Manual Part 1: Fundamentals of Refrigeration by copeland

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