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See Figure 3-9) This type of design is termed a cascade system, and allows the use of different refriger- 3-10 © 1968 Emerson Climate Technologies, Inc. All rights reserved. © 1968 Emerson Climate Technologies, Inc. All rights reserved. © 1968 Emerson Climate Technologies, Inc. All rights reserved. Form No. AE 101 R2 (10/06) Emerson®, Emerson. Consider It Solved™, Emerson Climate Technologies™ and the Emerson Climate Technologies™ logo are the trademarks and service marks of Emerson Electric Co.
These are the maximum allowable that can be tolerated to prevent flashing of the refrigerant in the liquid line. EFFECT OF SUPERHEATING THE VAPOR LEAVING THE EVAPORATOR It is essential that the temperature of the vapor returning to the compressor be superheated to avoid carrying liquid refrigerant back to the compressor. It is generally recommended that the minimum superheat value be 20°F when the system is at low load. If this heat is added to the vapor inside the refrigerated space, the heat absorbed increases the refrigeration capacity, while the increase in specific volume of the gas decreases the compressor capacity.
All rights reserved. Evaporator Condenser-Receiver Assembly Externally Compound System Figure 3-8 © 1968 Emerson Climate Technologies, Inc. All rights reserved. 3-9 Low Stage Comp. High Stage Evap . Low Stage Cond . High Stage Cond . High Stage Comp. Low Stage Evap . Cascade System Figure 3-9 CASCADE SYSTEMS ants in the separate systems. Refrigerants with characteristics and pressures suitable for ultra-low temperature refrigeration can be used in the low stage system. Cascade systems in multiples of two, three, or even more separate stages make possible refrigeration at almost any desired evaporating temperature.