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Sub-cooling in a vapour compression cycle
- a)Increases the required work and refrigeration effect
- b)Decreases the required work and refrigeration effect
- c)Does not affect the required work and increases the refrigeration effect
- d)Increases the required work and decreases refrigeration effect
Correct answer is option 'C'. Can you explain this answer?
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Verified Answer
Sub-cooling in a vapour compression cyclea)Increases the required wor...
Subcooling is the process of cooling the liquid refrigerant below the condensing temperature for a given pressure.
The difference between the saturation temperature and the temperature of a sub-cooled liquid at that pressure is called the Degree of subcooling.
Subcooling is beneficial as it increases the refrigeration effect by reducing the throttling loss at no additional specific work input.
Also, subcooling ensures that only liquid enters the throttling device leading to its efficient operation.
Effect of Subcooling:
- Increase the refrigeration effect
- Work input remains the same
- Increase in COP
Most Upvoted Answer
Sub-cooling in a vapour compression cyclea)Increases the required wor...
Sub-cooling in a vapor compression cycle refers to the process of further cooling the refrigerant liquid after it has been condensed. This is typically done by passing the condensed liquid through a sub-cooler before it enters the expansion valve. The sub-cooler transfers heat from the refrigerant to a cooling medium, such as air or water, further decreasing its temperature.
- Sub-cooling increases the refrigeration effect:
One of the main reasons for sub-cooling is to increase the refrigeration effect of the cycle. By further cooling the refrigerant liquid, its enthalpy decreases, which means it can absorb more heat when it evaporates inside the evaporator coil. This leads to a higher cooling capacity and improved performance of the system.
- Sub-cooling does not affect the required work:
The required work in a vapor compression cycle is primarily determined by the temperature difference between the evaporator and condenser. Sub-cooling does not change this temperature difference, as it occurs after the condenser. Therefore, the required work remains the same.
- Sub-cooling in the vapor compression cycle also improves the efficiency of the system. When the refrigerant is sub-cooled, its saturation temperature at the evaporator inlet decreases. This reduces the temperature lift that the compressor has to overcome, resulting in a decrease in the compressor's work requirement. As a result, the overall system efficiency improves.
- Sub-cooling helps to prevent flash gas:
Another important benefit of sub-cooling is that it helps to prevent flash gas formation. Flash gas refers to the sudden vaporization of liquid refrigerant due to a drop in pressure. This can occur in the expansion valve if the refrigerant is not adequately sub-cooled. Flash gas can lead to uneven distribution of refrigerant in the evaporator and reduce the efficiency of the system. By sub-cooling the liquid refrigerant, the likelihood of flash gas formation is minimized.
Overall, sub-cooling in a vapor compression cycle increases the refrigeration effect without affecting the required work. It improves the system efficiency, prevents flash gas formation, and enhances the overall performance of the refrigeration system.
- Sub-cooling increases the refrigeration effect:
One of the main reasons for sub-cooling is to increase the refrigeration effect of the cycle. By further cooling the refrigerant liquid, its enthalpy decreases, which means it can absorb more heat when it evaporates inside the evaporator coil. This leads to a higher cooling capacity and improved performance of the system.
- Sub-cooling does not affect the required work:
The required work in a vapor compression cycle is primarily determined by the temperature difference between the evaporator and condenser. Sub-cooling does not change this temperature difference, as it occurs after the condenser. Therefore, the required work remains the same.
- Sub-cooling in the vapor compression cycle also improves the efficiency of the system. When the refrigerant is sub-cooled, its saturation temperature at the evaporator inlet decreases. This reduces the temperature lift that the compressor has to overcome, resulting in a decrease in the compressor's work requirement. As a result, the overall system efficiency improves.
- Sub-cooling helps to prevent flash gas:
Another important benefit of sub-cooling is that it helps to prevent flash gas formation. Flash gas refers to the sudden vaporization of liquid refrigerant due to a drop in pressure. This can occur in the expansion valve if the refrigerant is not adequately sub-cooled. Flash gas can lead to uneven distribution of refrigerant in the evaporator and reduce the efficiency of the system. By sub-cooling the liquid refrigerant, the likelihood of flash gas formation is minimized.
Overall, sub-cooling in a vapor compression cycle increases the refrigeration effect without affecting the required work. It improves the system efficiency, prevents flash gas formation, and enhances the overall performance of the refrigeration system.
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Sub-cooling in a vapour compression cyclea)Increases the required work and refrigeration effectb)Decreases the required work and refrigeration effectc)Does not affect the required work and increases the refrigeration effectd)Increases the required work and decreases refrigeration effectCorrect answer is option 'C'. Can you explain this answer?
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Sub-cooling in a vapour compression cyclea)Increases the required work and refrigeration effectb)Decreases the required work and refrigeration effectc)Does not affect the required work and increases the refrigeration effectd)Increases the required work and decreases refrigeration effectCorrect answer is option 'C'. Can you explain this answer? for SSC 2024 is part of SSC preparation. The Question and answers have been prepared according to the SSC exam syllabus. Information about Sub-cooling in a vapour compression cyclea)Increases the required work and refrigeration effectb)Decreases the required work and refrigeration effectc)Does not affect the required work and increases the refrigeration effectd)Increases the required work and decreases refrigeration effectCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for SSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Sub-cooling in a vapour compression cyclea)Increases the required work and refrigeration effectb)Decreases the required work and refrigeration effectc)Does not affect the required work and increases the refrigeration effectd)Increases the required work and decreases refrigeration effectCorrect answer is option 'C'. Can you explain this answer?.
Sub-cooling in a vapour compression cyclea)Increases the required work and refrigeration effectb)Decreases the required work and refrigeration effectc)Does not affect the required work and increases the refrigeration effectd)Increases the required work and decreases refrigeration effectCorrect answer is option 'C'. Can you explain this answer? for SSC 2024 is part of SSC preparation. The Question and answers have been prepared according to the SSC exam syllabus. Information about Sub-cooling in a vapour compression cyclea)Increases the required work and refrigeration effectb)Decreases the required work and refrigeration effectc)Does not affect the required work and increases the refrigeration effectd)Increases the required work and decreases refrigeration effectCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for SSC 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Sub-cooling in a vapour compression cyclea)Increases the required work and refrigeration effectb)Decreases the required work and refrigeration effectc)Does not affect the required work and increases the refrigeration effectd)Increases the required work and decreases refrigeration effectCorrect answer is option 'C'. Can you explain this answer?.
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