What are the advantages and disadvantages of air refrigeration system?

Advantages:
1. The refrigerant used namely air is cheap and easily available.
2. There is no danger of fire or toxic effects due to leakages.
3. The weight to tonne of refrigeration ratio is less as compared to other systems.
Disadvantages:
1. The quantity of refrigerant used per tonne of refrigeration is high as compared to other system.
2. The COP of the system is very low. Therefore running cost is high.
3. The danger of frosting at the expander valves is more as the air contains moisture content.

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