A R22 refrigeration system is used to operate between 45degC and -30degC. The total coolingcapacity is 350 kW.a. What is the ideal COP of the system?b. What is the heat rejected by the system?c. What is the total power consumed by the system?There are several steps made to improve the performance of the system. What happens to theCOP, heat rejected and power consumed by the system when:d. For the same evaporator and condenser pressure, the temperature at the entrance of thecompressor is -20degC, and the inlet to the expansion valve is subcooled by 5degC.Due to the wide temperature gap, it is decided to use a two-stage refrigeration system using flashgas removal and optimal intercooling operation in a flash chamber. What happens to the COP,heat rejected and power consumed by the system when:e. Having a low pressure and high-pressure compression.f. Two evaporators and two compressors, with the lower temperature evaporator having acooling capacity of 225 kW.Notes:The solution for each described system should start with the proper P-h and schematic diagram.A summary of the enthalpy values should be presented for ease of checking.Manual solution is required for this examination.

Given data: The operating limits of the refrigeration system : 45°C and -30°CTotal cooling capacity…

A R22 refrigeration system is used to operate between 45degC and -30degC. The total cooling capacity is 350 kW. a. What is the ideal COP of the system? b. What is the heat rejected by the system? c. What is the total power consumed by the system?

A R22 refrigeration system is used to operate between 45degC and -30degC. The total cooling capacity is 350 kW. a. What is the ideal COP of the system? b. What is the heat rejected by the system? c. What is the total power consumed by the system?

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

Chapter25: Special Refrigeration System Components

Section: Chapter Questions

Problem 18RQ: Two methods for accomplishing defrost on low-temperature refrigeration systems are ____and___....

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Question

A R22 refrigeration system is used to operate between 45degC and -30degC. The total cooling
capacity is 350 kW.
a. What is the ideal COP of the system?
b. What is the heat rejected by the system?
c. What is the total power consumed by the system?
There are several steps made to improve the performance of the system. What happens to the
COP, heat rejected and power consumed by the system when:
d. For the same evaporator and condenser pressure, the temperature at the entrance of the
compressor is -20degC, and the inlet to the expansion valve is subcooled by 5degC.
Due to the wide temperature gap, it is decided to use a two-stage refrigeration system using flash
gas removal and optimal intercooling operation in a flash chamber. What happens to the COP,
heat rejected and power consumed by the system when:
e. Having a low pressure and high-pressure compression.
f. Two evaporators and two compressors, with the lower temperature evaporator having a
cooling capacity of 225 kW.
Notes:
The solution for each described system should start with the proper P-h and schematic diagram.
A summary of the enthalpy values should be presented for ease of checking.
Manual solution is required for this examination.

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