Q1:- A refrigeration unit using R-134a as a refrigerant operating with two evaporators at -4 °C and-20 °C and have the cooling loads of 20 TR and 40 TR, respectively. The unit employs compound compression with flash intercooling at the evaporator pressure operating at higher temperature. The condenser temperature is 40 °C. It is assumed that the vapour leaving the evaporator is in dry saturated condition. Draw the cycle on a p-h diagram, and determine the following: (a) the mass flow rate of refrigerant in each evaporator. (b) the power required by the compressors in kW. (c ) the coefficient of performance.

Q1:- A refrigeration unit using R-134a as a refrigerant operating with two evaporators at -4 °C and-20 °C and have the cooling loads of 20 TR and 40 TR, respectively. The unit employs compound compression with flash intercooling at the evaporator pressure operating at higher temperature. The condenser temperature is 40 °C. It is assumed that the vapour leaving the evaporator is in dry saturated condition. Draw the cycle on a p-h diagram, and determine the following: (a) the mass flow rate of refrigerant in each evaporator. (b) the power required by the compressors in kW. (c ) the coefficient of performance.

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

Chapter3: Refrigeration And Refrigerants

Section: Chapter Questions

Problem 10RQ: If the evaporating pressure was 76 psig for R-22 and the compressor inlet temperature was 65F, what...

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