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Pick up the correct statement -
- a)The refrigerant should have high thermal conductivity and low freezing temperature
- b)The refrigerator should have a low heat transfer coefficient and high latent heat.
- c)The refrigerant should have a high specific volume and high latent heat.
- d)The refrigerator should have high specific volume and low latent heat
Correct answer is option 'A'. Can you explain this answer?
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Pick up the correct statement -a)The refrigerant should have high the...
Required Properties of Ideal Refrigerant:
1) The refrigerant should have a low boiling point and a low freezing point.
2) It must have low specific heat and high latent heat. Because high specific heat decreases the refrigerating effect per kg of refrigerant and high latent heat at low temperature increases the refrigerating effect per kg of refrigerant.
3) It must have high critical pressure and temperature to avoid large power requirements.
4) The pressures required to be maintained in the evaporator and condenser should be low enough to reduce the material cost and must be positive to avoid leakage of air into the system.
5) It should have a low specific volume to reduce the size of the compressor.
6) It must have high thermal conductivity and a high heat transfer coefficient to reduce the area of heat transfer in the evaporator and condenser.
7) It should be non-flammable, non-explosive, non-toxic, and non-corrosive.
8) It should not have any bad effects on the stored material or food when any leak develops in the system.
9) It must have high miscibility with lubricating oil, and it should not react properly with lubricating oil in the temperature range of the system.
10) It should give high COP in the working temperature range. This is necessary to reduce the running cost of the system.
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Pick up the correct statement -a)The refrigerant should have high the...
The correct statement is option 'A': The refrigerant should have high thermal conductivity and low freezing temperature.
Explanation:
1. Importance of refrigerant in a refrigeration system:
- A refrigerant is a substance that is used in a refrigeration system to transfer heat from one place to another.
- It undergoes a phase change from a low-pressure vapor to a high-pressure liquid as it absorbs heat from the surroundings and releases it elsewhere.
2. Criteria for selecting a refrigerant:
- The selection of a refrigerant is crucial as it directly affects the efficiency and performance of the refrigeration system.
- Some of the important criteria for selecting a refrigerant are:
- Thermal conductivity
- Freezing temperature
- Heat transfer coefficient
- Latent heat
- Specific volume
3. High thermal conductivity:
- Thermal conductivity refers to the ability of a substance to conduct heat.
- In a refrigeration system, the refrigerant should have high thermal conductivity to efficiently transfer heat from the surroundings to the refrigerant and vice versa.
- This ensures efficient heat transfer during the cooling process.
4. Low freezing temperature:
- Freezing temperature refers to the temperature at which a substance changes from a liquid state to a solid state.
- In a refrigeration system, the refrigerant should have a low freezing temperature to prevent the formation of ice or frost on the evaporator coils.
- This allows for smooth and uninterrupted operation of the system.
5. Other options:
- Option 'B' states that the refrigerator should have a low heat transfer coefficient and high latent heat. This is incorrect as a low heat transfer coefficient would result in poor heat transfer, while a high latent heat is not a desirable characteristic for a refrigerant.
- Option 'C' states that the refrigerant should have a high specific volume and high latent heat. This is also incorrect as a high specific volume would require larger equipment and higher energy consumption, and a high latent heat is not necessary for efficient heat transfer.
- Option 'D' states that the refrigerator should have high specific volume and low latent heat. This is incorrect as a high specific volume would result in larger equipment and higher energy consumption, and a low latent heat is not desirable for efficient heat transfer.
Conclusion:
- Among the given options, option 'A' is the correct statement as the refrigerant should have high thermal conductivity and low freezing temperature to ensure efficient heat transfer and prevent the formation of ice or frost.
Explanation:
1. Importance of refrigerant in a refrigeration system:
- A refrigerant is a substance that is used in a refrigeration system to transfer heat from one place to another.
- It undergoes a phase change from a low-pressure vapor to a high-pressure liquid as it absorbs heat from the surroundings and releases it elsewhere.
2. Criteria for selecting a refrigerant:
- The selection of a refrigerant is crucial as it directly affects the efficiency and performance of the refrigeration system.
- Some of the important criteria for selecting a refrigerant are:
- Thermal conductivity
- Freezing temperature
- Heat transfer coefficient
- Latent heat
- Specific volume
3. High thermal conductivity:
- Thermal conductivity refers to the ability of a substance to conduct heat.
- In a refrigeration system, the refrigerant should have high thermal conductivity to efficiently transfer heat from the surroundings to the refrigerant and vice versa.
- This ensures efficient heat transfer during the cooling process.
4. Low freezing temperature:
- Freezing temperature refers to the temperature at which a substance changes from a liquid state to a solid state.
- In a refrigeration system, the refrigerant should have a low freezing temperature to prevent the formation of ice or frost on the evaporator coils.
- This allows for smooth and uninterrupted operation of the system.
5. Other options:
- Option 'B' states that the refrigerator should have a low heat transfer coefficient and high latent heat. This is incorrect as a low heat transfer coefficient would result in poor heat transfer, while a high latent heat is not a desirable characteristic for a refrigerant.
- Option 'C' states that the refrigerant should have a high specific volume and high latent heat. This is also incorrect as a high specific volume would require larger equipment and higher energy consumption, and a high latent heat is not necessary for efficient heat transfer.
- Option 'D' states that the refrigerator should have high specific volume and low latent heat. This is incorrect as a high specific volume would result in larger equipment and higher energy consumption, and a low latent heat is not desirable for efficient heat transfer.
Conclusion:
- Among the given options, option 'A' is the correct statement as the refrigerant should have high thermal conductivity and low freezing temperature to ensure efficient heat transfer and prevent the formation of ice or frost.
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Pick up the correct statement -a)The refrigerant should have high thermal conductivity and low freezing temperatureb)The refrigerator should have a low heat transfer coefficient and high latent heat.c)The refrigerant should have a high specific volume and high latent heat.d)The refrigerator should have high specific volume and low latent heatCorrect answer is option 'A'. Can you explain this answer?
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