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In a vapour absorption refrigerator, the temperatures of evaporator and ambient air are 10°C and 30°C respectively. For obtaining COP of 2 for this system, the temperature of the generator is to be nearly

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  1. 90 °C
  2. 85 °C
  3. 80 °C
  4. 75 °C

Answer (Detailed Solution Below)

Option 3 : 80 °C
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Detailed Solution

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Concept:

TG is the generator temperature, TE is the evaporator temperature and T0 is the environment temperature

Calculation:

Given: 

TE = 10°C = 283 K, T0 = 30°C = 303 K, COP = 2

Now,

TG = 352.87 K

TG = 79.87°C 

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