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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 low heat transfer coefficient and high latent heat.
  • c)
    The refrigerant should have 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?
Verified Answer
Pick up the correct statement -a)The refrigerant should have high ther...
Required Properties of Ideal Refrigerant:
1) The refrigerant should have low boiling point and 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 low specific volume to reduce the size of the compressor.
6) It must have high thermal conductivity and high heat transfer coefficient to reduce the area of heat transfer in 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 have reacting 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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Most Upvoted Answer
Pick up the correct statement -a)The refrigerant should have high ther...
Statement analysis:
The statement is related to the selection criteria for a refrigerant and a refrigerator. It provides four options, and we need to select the correct one.

Explanation:
a) The refrigerant should have high thermal conductivity and low freezing temperature:
This statement is correct. A refrigerant should have high thermal conductivity to efficiently transfer heat from the refrigerated space to the condenser. It should also have a low freezing temperature to prevent the refrigerant from freezing at low temperatures.

b) The refrigerator should have low heat transfer coefficient and high latent heat:
This statement is incorrect. A refrigerator should have a high heat transfer coefficient to enhance the heat transfer process. It should also have a low latent heat to ensure quick cooling and condensation of the refrigerant.

c) The refrigerant should have high specific volume and high latent heat:
This statement is incorrect. The refrigerant should have a high latent heat to absorb heat during the evaporation process. However, a high specific volume may lead to increased size and cost of the refrigeration system.

d) The refrigerator should have high specific volume and low latent heat:
This statement is incorrect. A high specific volume in the refrigerator may result in a bulky and inefficient system. A low latent heat would limit the cooling capacity of the refrigerator.

Conclusion:
Among the given options, option 'A' is the correct statement. A refrigerant should have high thermal conductivity and low freezing temperature to ensure efficient heat transfer and prevent freezing.
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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 low heat transfer coefficient and high latent heat.c)The refrigerant should have 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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