Freon-11

Freon-22

C02

ammonia.

reduce compressor overheating

reduce compressor discharge temperature

increase cooling effect

ensure that only liquid and not the vapour enters the expansion (throttling) valve

always less than unity

always more than unity

equal to unity

any one of the above

more

less

same

more for small capacity and less for high capacity

of cooling medium

of freezing zone

of evaporator

at which refrigerant gas becomes liquid