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REFRIGERATION AND AIR CONDITIONING

Refrigeration and Air Conditioning
In vapour compression cycle using NH₃ as refrigerant, initial charge is filled at

Delivery of compressor
High pressure side close to receiver
Low pressure side near receiver
Suction of compressor

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Refrigeration and Air Conditioning
If a heat pump cycle operates between the condenser temperature of +27°C and evaporator temperature of -23°C, then the Carnot COP will be

0.2
5
6
1.2

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Refrigeration and Air Conditioning
Vertical lines on pressure-enthalpy chart show constant

Pressure lines
Total heat lines
Entropy lines
Temperature lines

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Refrigeration and Air Conditioning
A vapour absorption refrigerator uses _________ as a refrigerant.

Freon
Ammonia
Aqua-ammonia
Water

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Refrigeration and Air Conditioning
Which of the following statement is correct for ammonia as a refrigerant?

It requires large displacement per TR compared to fluoro carbons.
It reacts with copper and its alloys.
It is toxic to mucous membranes.
All of these

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