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
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
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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