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___....
Related questions
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.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fd8c5408d-ab53-4eb8-ab6c-8b1f3a8c08fe%2Ff6a2e33f-e07a-485d-9293-4ec5318d8f88%2Fbja5fph_processed.png&w=3840&q=75)
Transcribed Image Text: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.
Expert Solution
![](/static/compass_v2/shared-icons/check-mark.png)
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step by step
Solved in 2 steps
![Blurred answer](/static/compass_v2/solution-images/blurred-answer.jpg)
Knowledge Booster
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Recommended textbooks for you
![Refrigeration and Air Conditioning Technology (Mi…](https://www.bartleby.com/isbn_cover_images/9781305578296/9781305578296_smallCoverImage.gif)
Refrigeration and Air Conditioning Technology (Mi…
Mechanical Engineering
ISBN:
9781305578296
Author:
John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:
Cengage Learning
![Refrigeration and Air Conditioning Technology (Mi…](https://www.bartleby.com/isbn_cover_images/9781305578296/9781305578296_smallCoverImage.gif)
Refrigeration and Air Conditioning Technology (Mi…
Mechanical Engineering
ISBN:
9781305578296
Author:
John Tomczyk, Eugene Silberstein, Bill Whitman, Bill Johnson
Publisher:
Cengage Learning