a two-stage cascade refrigeration system uses ammonia as the refrigerant. The mass flow rate in the high-pressure loop is 0.2 kg/s. The condenser saturated temperature is 38 C and the evaporator temperature is – 30 C. The cascade condenser is a direct-contact type with a pressure of 355.71 kPa. Sketch the schematic diagram of the cascade system and determine (a) the refrigerating effect in tons, (b) the power required in each compressor in kW and (c) the COP.

a two-stage cascade refrigeration system uses ammonia as the refrigerant. The mass flow rate in the high-pressure loop is 0.2 kg/s. The condenser saturated temperature is 38 C and the evaporator temperature is – 30 C. The cascade condenser is a direct-contact type with a pressure of 355.71 kPa. Sketch the schematic diagram of the cascade system and determine (a) the refrigerating effect in tons, (b) the power required in each compressor in kW and (c) the COP.

Refrigeration and Air Conditioning Technology (MindTap Course List)

8th Edition

ISBN:9781305578296

Author:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Publisher:John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson

Chapter22: Condensers

Section: Chapter Questions

Problem 7RQ: When a standard-efficiency air-cooled condenser is used, the condensing refrigerant will normally be...

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Question

a two-stage cascade refrigeration system uses ammonia as the refrigerant. The mass flow
rate in the high-pressure loop is 0.2 kg/s. The condenser saturated temperature is 38 C and
the evaporator temperature is – 30 C. The cascade condenser is a direct-contact type with a
pressure of 355.71 kPa. Sketch the schematic diagram of the cascade system and determine
(a) the refrigerating effect in tons, (b) the power required in each compressor in kW and (c)
the COP.

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