This refrigeration cycle uses R-134a as the working fluid and, for now, assume that it operates on an ideal vapour-compression refrigeration cycle between 0.11 and 1.0 MPa. If the mass flow rate of the refrigerant is 0.075 kg/s, determine What is the rate of heat removal from the refrigerated space? What is the power input to the compressor? What is the rate of heat rejection to the environment? What is the COP of this ideal process? Based on this analysis, what is the cost of electricity to operate the cold room for 1 year? Comment on why this differs to the value above Further data was collected which determined that the working fluid: enters the compressor at 0.11 MPa and -22°C leaves the compressor at 1.0 MPa and 60°C is cooled in the condenser to 0.9 MPa and 20°C is throttled to 0.12 MPa Disregarding any heat transfer or pressure losses in the pipes: What is the rate of heat removal from the refrigerated space? What is the power input to the compressor? What is the COP of this process? Based on this analysis, what is the cost of electricity to operate the cold room for 1 year? Explain why this differs to the value in Question 1.2 in terms of the process thermodynamics What is the quality of the refrigerant at the inlet of the evaporator? (throttling valve) What is the isentropic efficiency of the compressor? (compressor) What is the rate of heat rejection to the environment? (condenser) If the evaporator becomes frosted over and decreases QL by 40% what is the new COP of the process (assuming Win stays constant). Prove your answer with calculations.

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

Chapter28: Special Refrigeration Applications

Section: Chapter Questions

Problem 15RQ: Why is two-stage compression popular for extra-low-temperature refrigeration systems?

See similar textbooks

Related questions

Question

This refrigeration cycle uses R-134a as the working fluid and, for now, assume that it operates on an ideal vapour-compression refrigeration cycle between 0.11 and 1.0 MPa. If the mass flow rate of the refrigerant is 0.075 kg/s, determine

What is the rate of heat removal from the refrigerated space?
What is the power input to the compressor?
What is the rate of heat rejection to the environment?
What is the COP of this ideal process?
Based on this analysis, what is the cost of electricity to operate the cold room for 1 year? Comment on why this differs to the value above

Further data was collected which determined that the working fluid:

enters the compressor at 0.11 MPa and -22°C
leaves the compressor at 1.0 MPa and 60°C
is cooled in the condenser to 0.9 MPa and 20°C
is throttled to 0.12 MPa

Disregarding any heat transfer or pressure losses in the pipes:

What is the rate of heat removal from the refrigerated space?
What is the power input to the compressor?
What is the COP of this process?
Based on this analysis, what is the cost of electricity to operate the cold room for 1 year? Explain why this differs to the value in Question 1.2 in terms of the process thermodynamics

What is the quality of the refrigerant at the inlet of the evaporator? (throttling valve)

What is the isentropic efficiency of the compressor? (compressor)

What is the rate of heat rejection to the environment? (condenser)

If the evaporator becomes frosted over and decreases Q_L by 40% what is the new COP of the process (assuming Win stays constant). Prove your answer with calculations.

Expert Solution

Step by step

Solved in 2 steps with 9 images

SEE SOLUTION Check out a sample Q&A here