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An ideal vapour compression refrigerator operates between a condenser pressure P1 and an evaporator pressure P2. Which of the following changes would increase its COP?
- a)Increasing P1 by Δ P and keeping P2 constant
- b)Decreasing P2 by Δ P and keeping P1 constant
- c)Adopting wet compression
- d)Subcooling the refrigerant
Correct answer is option 'D'. Can you explain this answer?
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An ideal vapour compression refrigerator operates between a condenser ...
COP decreases both with decreasing evaporator and increasing condenser pressures. The COP increases by installing a subcooler between the condenser and the expansion valve. The subcooling reduces flashing of the liquid during expansion and increases refrigerating effect.
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An ideal vapour compression refrigerator operates between a condenser ...
Reducing P2
b)Increasing P2 by reducing P1
c)Increasing both P1 and P2
d)Reducing both P1 and P2
The correct answer is a) Increasing P1 by reducing P2.
The Coefficient of Performance (COP) of a vapour compression refrigerator is given by COP = Qc/W, where Qc is the cooling effect (heat extracted from the refrigerated space) and W is the work done by the compressor.
By increasing P1 and reducing P2, the temperature difference between the condenser and the evaporator will increase. This will result in a larger temperature gradient and therefore a higher cooling effect (Qc). At the same time, the work done by the compressor (W) will remain relatively constant. As a result, the COP will increase.
Increasing P2 by reducing P1 (option b) will have the opposite effect. It will reduce the temperature difference between the condenser and the evaporator, resulting in a lower cooling effect (Qc) and a lower COP.
Increasing both P1 and P2 (option c) will also have a negative effect on the COP. Although it may increase the cooling effect (Qc), it will also increase the work done by the compressor (W), resulting in a relatively constant or lower COP.
Reducing both P1 and P2 (option d) will not significantly affect the temperature difference between the condenser and the evaporator, resulting in little to no change in the COP.
b)Increasing P2 by reducing P1
c)Increasing both P1 and P2
d)Reducing both P1 and P2
The correct answer is a) Increasing P1 by reducing P2.
The Coefficient of Performance (COP) of a vapour compression refrigerator is given by COP = Qc/W, where Qc is the cooling effect (heat extracted from the refrigerated space) and W is the work done by the compressor.
By increasing P1 and reducing P2, the temperature difference between the condenser and the evaporator will increase. This will result in a larger temperature gradient and therefore a higher cooling effect (Qc). At the same time, the work done by the compressor (W) will remain relatively constant. As a result, the COP will increase.
Increasing P2 by reducing P1 (option b) will have the opposite effect. It will reduce the temperature difference between the condenser and the evaporator, resulting in a lower cooling effect (Qc) and a lower COP.
Increasing both P1 and P2 (option c) will also have a negative effect on the COP. Although it may increase the cooling effect (Qc), it will also increase the work done by the compressor (W), resulting in a relatively constant or lower COP.
Reducing both P1 and P2 (option d) will not significantly affect the temperature difference between the condenser and the evaporator, resulting in little to no change in the COP.
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An ideal vapour compression refrigerator operates between a condenser pressure P1 and an evaporator pressure P2. Which of the following changes would increase its COP?a)Increasing P1by Δ P and keeping P2 constantb)Decreasing P2 by Δ P and keeping P1 constantc)Adopting wet compressiond)Subcooling the refrigerantCorrect answer is option 'D'. Can you explain this answer?
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An ideal vapour compression refrigerator operates between a condenser pressure P1 and an evaporator pressure P2. Which of the following changes would increase its COP?a)Increasing P1by Δ P and keeping P2 constantb)Decreasing P2 by Δ P and keeping P1 constantc)Adopting wet compressiond)Subcooling the refrigerantCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about An ideal vapour compression refrigerator operates between a condenser pressure P1 and an evaporator pressure P2. Which of the following changes would increase its COP?a)Increasing P1by Δ P and keeping P2 constantb)Decreasing P2 by Δ P and keeping P1 constantc)Adopting wet compressiond)Subcooling the refrigerantCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An ideal vapour compression refrigerator operates between a condenser pressure P1 and an evaporator pressure P2. Which of the following changes would increase its COP?a)Increasing P1by Δ P and keeping P2 constantb)Decreasing P2 by Δ P and keeping P1 constantc)Adopting wet compressiond)Subcooling the refrigerantCorrect answer is option 'D'. Can you explain this answer?.
An ideal vapour compression refrigerator operates between a condenser pressure P1 and an evaporator pressure P2. Which of the following changes would increase its COP?a)Increasing P1by Δ P and keeping P2 constantb)Decreasing P2 by Δ P and keeping P1 constantc)Adopting wet compressiond)Subcooling the refrigerantCorrect answer is option 'D'. Can you explain this answer? for Mechanical Engineering 2024 is part of Mechanical Engineering preparation. The Question and answers have been prepared according to the Mechanical Engineering exam syllabus. Information about An ideal vapour compression refrigerator operates between a condenser pressure P1 and an evaporator pressure P2. Which of the following changes would increase its COP?a)Increasing P1by Δ P and keeping P2 constantb)Decreasing P2 by Δ P and keeping P1 constantc)Adopting wet compressiond)Subcooling the refrigerantCorrect answer is option 'D'. Can you explain this answer? covers all topics & solutions for Mechanical Engineering 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for An ideal vapour compression refrigerator operates between a condenser pressure P1 and an evaporator pressure P2. Which of the following changes would increase its COP?a)Increasing P1by Δ P and keeping P2 constantb)Decreasing P2 by Δ P and keeping P1 constantc)Adopting wet compressiond)Subcooling the refrigerantCorrect answer is option 'D'. Can you explain this answer?.
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