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Lowering the evaporator pressure in a vapour compression cycle
- a)Decreases the required work and COP
- b)Increases the required work and COP
- c)Increases the required work and decreases the COP
- d)Decreases the required work and increases the COP
Correct answer is option 'C'. Can you explain this answer?
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Lowering the evaporator pressure in a vapour compression cyclea)Decre...
Decrease evaporator pressure.
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C.O.P decreases as work input increases. C.O.P = 
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Lowering the evaporator pressure in a vapour compression cyclea)Decre...
Lowering the evaporator pressure in a vapour compression cycle has a significant impact on the performance of the system. It affects the required work and COP (Coefficient of Performance) of the cycle. Let's understand how:
Impact on Required Work:
Lowering the evaporator pressure in a vapour compression cycle increases the temperature difference between the evaporator and the condenser. This increases the compression ratio, and as a result, the required work also increases. Therefore, option B is incorrect.
Impact on COP:
Lowering the evaporator pressure also decreases the refrigerant's enthalpy at the evaporator inlet, which reduces the cooling capacity of the cycle. As a result, more work is required to maintain the same cooling effect, and the COP decreases. Therefore, option A and D are incorrect.
Therefore, the correct answer is option C, which states that lowering the evaporator pressure in a vapour compression cycle increases the required work and decreases the COP.
In conclusion, it is essential to maintain the optimum evaporator pressure in a vapour compression cycle to achieve maximum efficiency and performance.
Impact on Required Work:
Lowering the evaporator pressure in a vapour compression cycle increases the temperature difference between the evaporator and the condenser. This increases the compression ratio, and as a result, the required work also increases. Therefore, option B is incorrect.
Impact on COP:
Lowering the evaporator pressure also decreases the refrigerant's enthalpy at the evaporator inlet, which reduces the cooling capacity of the cycle. As a result, more work is required to maintain the same cooling effect, and the COP decreases. Therefore, option A and D are incorrect.
Therefore, the correct answer is option C, which states that lowering the evaporator pressure in a vapour compression cycle increases the required work and decreases the COP.
In conclusion, it is essential to maintain the optimum evaporator pressure in a vapour compression cycle to achieve maximum efficiency and performance.
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Lowering the evaporator pressure in a vapour compression cyclea)Decreases the required work and COPb)Increases the required work and COPc)Increases the required work and decreases the COPd)Decreases the required work and increases the COPCorrect answer is option 'C'. Can you explain this answer?
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