Mechanical Engineering - Heat Transfer, Refrigeration and Air Conditioning - Discussion
Discussion Forum : Heat Transfer, Refrigeration and Air Conditioning - Section 8 (Q.No. 5)
5.
The lowest temperature during the cycle in a vapour compression system occurs after
Discussion:
25 comments Page 1 of 3.
Asif ahamed said:
9 years ago
In VCR system if we observed in H-S and T-S diagram lowest temperature point is point 4 i.e. after expansion. So the answer is after expansion because after evaporation the condition of refrigerant is saturated vapor then how will be the lowest temperature after evaporation?
Kuldeep Gupta said:
3 years ago
In actual, at the end of the evaporator, we always get superheated vapor which is obviously greater than the temp of the refrigerant after expansion.
Therefore the temp of the refrigerant is lowest after expansion. So, option B is correct.
Therefore the temp of the refrigerant is lowest after expansion. So, option B is correct.
Ankit Kumar said:
6 years ago
Yes, the temperature is constant during evaporation but within the dome, when constant pressure line crosses the dome then he goes in the superheated region and here temp is not constant, so the most appropriate answer is after expansion.
Venkat sri said:
1 decade ago
In general the lowest temperature in any refrigeration cycle is occur after the EXPANSION process only. But in the answer mentioned that is after evaporation.
In the process of evaporation the refrigerant collect latent heat from bodies.
In the process of evaporation the refrigerant collect latent heat from bodies.
Arun said:
6 years ago
After"Expansion" Low temperature occurs.
After"evaporation " Low temperature to normal temperature because of heat addition occur during evaporation. So, answer is option (A).
After"evaporation " Low temperature to normal temperature because of heat addition occur during evaporation. So, answer is option (A).
Chacoboy said:
8 years ago
Due to sudden drop of pressure at expansion the temperature also drops but after expansion latin heat is received during the evaporation so correct answer is Expansion.
Deepak rathva said:
7 years ago
After expansion is right.
But evaporation is also done at constant temperature in VCR.
So, the Answer is 1. After expansion & 2. During evaporation.
But evaporation is also done at constant temperature in VCR.
So, the Answer is 1. After expansion & 2. During evaporation.
Nikunj Miyani said:
8 years ago
Both B and D answers are right. Because in evaporation, Refrigerant Absorbs latent heat at constant pressure. Only state changes, not temperature.
Pranesh said:
1 decade ago
The temperature after expansion and after evaporation remains same since after expansion, evaporation occurs at constant temperature.
Punit Vyas said:
1 decade ago
@Pranesh.
But during evaporation refrigerant takes latent heat so temp will be raised. So answer will be expansion.
But during evaporation refrigerant takes latent heat so temp will be raised. So answer will be expansion.
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