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When the lower temperature is fixed, COP of a refrigerating machine can be improved by:
- a)Operating the machine at higher speeds
- b)Operating the machine at lower speeds
- c)Raising the higher temperature
- d)Lowering the higher temperature
Correct answer is option 'D'. Can you explain this answer?
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Verified Answer
When the lower temperature is fixed, COP of a refrigerating machine ca...
In heat engines higher efficiency can be achieved when (T1 – T2) is higher. In refrigerating machines it is the reverse, i.e. (T1 – T2) should be lower.
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When the lower temperature is fixed, COP of a refrigerating machine ca...
The correct answer is option 'D' - Lowering the higher temperature. Let's break down why this is the correct choice:
- Understanding COP:
Coefficient of Performance (COP) is a key parameter in refrigeration systems that represents the efficiency of the system in transferring heat. It is defined as the ratio of cooling effect (Qc) to the work input (W) required to achieve that cooling effect, COP = Qc/W.
- Relationship between temperature and COP:
COP is influenced by the temperatures at which the refrigeration cycle operates. Lowering the higher temperature in the cycle can lead to an improvement in COP.
- Explanation:
When the higher temperature in the refrigeration cycle is lowered, the temperature difference between the hot and cold reservoirs decreases. This results in a more efficient heat transfer process, as the refrigeration machine has to do less work to achieve the same cooling effect.
- Impact on efficiency:
By lowering the higher temperature, the COP of the refrigeration machine increases, indicating that the system is operating more efficiently. This means that for the same amount of work input, the machine can provide a greater cooling effect.
- Conclusion:
In conclusion, to improve the COP of a refrigerating machine when the lower temperature is fixed, lowering the higher temperature in the cycle is the most effective method. This adjustment can lead to a more efficient operation of the refrigeration system, resulting in energy savings and better performance.
- Understanding COP:
Coefficient of Performance (COP) is a key parameter in refrigeration systems that represents the efficiency of the system in transferring heat. It is defined as the ratio of cooling effect (Qc) to the work input (W) required to achieve that cooling effect, COP = Qc/W.
- Relationship between temperature and COP:
COP is influenced by the temperatures at which the refrigeration cycle operates. Lowering the higher temperature in the cycle can lead to an improvement in COP.
- Explanation:
When the higher temperature in the refrigeration cycle is lowered, the temperature difference between the hot and cold reservoirs decreases. This results in a more efficient heat transfer process, as the refrigeration machine has to do less work to achieve the same cooling effect.
- Impact on efficiency:
By lowering the higher temperature, the COP of the refrigeration machine increases, indicating that the system is operating more efficiently. This means that for the same amount of work input, the machine can provide a greater cooling effect.
- Conclusion:
In conclusion, to improve the COP of a refrigerating machine when the lower temperature is fixed, lowering the higher temperature in the cycle is the most effective method. This adjustment can lead to a more efficient operation of the refrigeration system, resulting in energy savings and better performance.
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When the lower temperature is fixed, COP of a refrigerating machine can be improved by:a)Operating the machine at higher speeds b)Operating the machine at lower speeds c)Raising the higher temperature d)Lowering the higher temperatureCorrect answer is option 'D'. Can you explain this answer?
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