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Refrigeration and Air Conditioning

Refrigeration and Air Conditioning
Which of the following refrigerants has lowest freezing point?

Freon-12
Freon-22
CO2
NH3

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Refrigeration and Air Conditioning
Under cooling in a refrigeration cycle

Increases C.O.P
O.P remains unaltered
Other factors decide C.O.P
Decreases C.O.P

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Refrigeration and Air Conditioning
In mechanical refrigeration system, the refrigerant has the maximum temperature

In evaporator
Between compressor and condenser
Before expansion valve
Between condenser and evaporator

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Refrigeration and Air Conditioning
In a vapour compression cycle, the refrigerant immediately after expansion valve is

Wet vapour
Liquid
Sub-cooled liquid
Saturated liquid

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Refrigeration and Air Conditioning
The alignment circle is marked on the psychrometric chart at

26°C DBT and 60% RH
20°C DBT and 50% RH
20°C DBT and 60% RH
26°C DBT and 50% RH

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

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

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