Answered: A compression refrigeration system…

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Problem A compression refrigeration system operating with refrigerant R-134a has two stages. The maximum system pressure is 1.4 MPa while the minimum system pressure is 0.10MPa. After leaving the condenser as a saturated liquid, the working fluid is throttled to a flash chamber operating at 0.4 MPa. The vapor from the flash chamber is mixed with the refrigerant leaving the low pressure compressor before entering the high pressure compressor. The liquid leaving the flash chamber is throttled to the evaporator pressure. Assume the refrigerant leaves the evaporator as a saturated vapor and the compressors are isentropic. First, draw the T-s diagram of the system. Then find (i) the fraction of refrigerant that leaves the flash chamber as a vapor, (in) the rate of heat removal from the refrigerated space if the mass flow rate through the condenser is 0.25 kg/s, and (ili) the coefficient of performance.

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