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Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results in
- a)Increase in condensation pressure
- b)Decrease in pressure ratio
- c)Increase in pressure ratio
- d)Increase in condensation temperature
Correct answer is option 'D'. Can you explain this answer?
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Replacing a water-cooled condenser with an air-cooled one in a vapour ...
Heat transfer co-efficient of gas very small compared to water hwater >> hair. So for same heat transfer temperature difference will be high
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Replacing a water-cooled condenser with an air-cooled one in a vapour ...
Explanation:
Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results in an increase in condensation temperature. This can be explained as follows:
• Water-cooled condenser: In a water-cooled condenser, the refrigerant transfers heat to the cooling water, which is then discharged to the environment. The temperature of the cooling water is usually lower than the temperature of the ambient air. Therefore, the refrigerant can be condensed at a lower temperature in a water-cooled condenser.
• Air-cooled condenser: In an air-cooled condenser, the refrigerant transfers heat to the ambient air, which is then discharged to the environment. The temperature of the ambient air is usually higher than the temperature of the cooling water used in a water-cooled condenser. Therefore, the refrigerant can only be condensed at a higher temperature in an air-cooled condenser.
• Constant evaporator pressure: The evaporator pressure in a vapour compression refrigeration system is usually kept constant by adjusting the expansion valve. When the evaporator pressure is constant, the saturation temperature of the refrigerant at the evaporator outlet is also constant.
• Increase in condensation temperature: When a water-cooled condenser is replaced with an air-cooled one, the condensation temperature of the refrigerant increases. This is because the refrigerant can only be condensed at a higher temperature in an air-cooled condenser due to the higher temperature of the ambient air. Since the evaporator pressure is constant, the saturation temperature of the refrigerant at the evaporator outlet remains the same. Therefore, the temperature difference between the evaporator outlet and the condenser outlet increases, which reduces the refrigeration effect.
Conclusion:
Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results in an increase in condensation temperature, which reduces the refrigeration effect.
Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results in an increase in condensation temperature. This can be explained as follows:
• Water-cooled condenser: In a water-cooled condenser, the refrigerant transfers heat to the cooling water, which is then discharged to the environment. The temperature of the cooling water is usually lower than the temperature of the ambient air. Therefore, the refrigerant can be condensed at a lower temperature in a water-cooled condenser.
• Air-cooled condenser: In an air-cooled condenser, the refrigerant transfers heat to the ambient air, which is then discharged to the environment. The temperature of the ambient air is usually higher than the temperature of the cooling water used in a water-cooled condenser. Therefore, the refrigerant can only be condensed at a higher temperature in an air-cooled condenser.
• Constant evaporator pressure: The evaporator pressure in a vapour compression refrigeration system is usually kept constant by adjusting the expansion valve. When the evaporator pressure is constant, the saturation temperature of the refrigerant at the evaporator outlet is also constant.
• Increase in condensation temperature: When a water-cooled condenser is replaced with an air-cooled one, the condensation temperature of the refrigerant increases. This is because the refrigerant can only be condensed at a higher temperature in an air-cooled condenser due to the higher temperature of the ambient air. Since the evaporator pressure is constant, the saturation temperature of the refrigerant at the evaporator outlet remains the same. Therefore, the temperature difference between the evaporator outlet and the condenser outlet increases, which reduces the refrigeration effect.
Conclusion:
Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results in an increase in condensation temperature, which reduces the refrigeration effect.
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Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results ina)Increase in condensation pressure b)Decrease in pressure ratio c)Increase in pressure ratio d)Increase in condensation temperatureCorrect answer is option 'D'. Can you explain this answer?
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Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results ina)Increase in condensation pressure b)Decrease in pressure ratio c)Increase in pressure ratio d)Increase in condensation temperatureCorrect 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 Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results ina)Increase in condensation pressure b)Decrease in pressure ratio c)Increase in pressure ratio d)Increase in condensation temperatureCorrect 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 Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results ina)Increase in condensation pressure b)Decrease in pressure ratio c)Increase in pressure ratio d)Increase in condensation temperatureCorrect answer is option 'D'. Can you explain this answer?.
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Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results ina)Increase in condensation pressure b)Decrease in pressure ratio c)Increase in pressure ratio d)Increase in condensation temperatureCorrect answer is option 'D'. Can you explain this answer?, a detailed solution for Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results ina)Increase in condensation pressure b)Decrease in pressure ratio c)Increase in pressure ratio d)Increase in condensation temperatureCorrect answer is option 'D'. Can you explain this answer? has been provided alongside types of Replacing a water-cooled condenser with an air-cooled one in a vapour compression refrigeration system with constant evaporator pressure results ina)Increase in condensation pressure b)Decrease in pressure ratio c)Increase in pressure ratio d)Increase in condensation temperatureCorrect answer is option 'D'. Can you explain this answer? theory, EduRev gives you an
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