Before expansion valve
In evaporator
Between evaporator and condenser
Between compressor and condenser
After passing through the expansion valv
After passing through the condenser
Before passing through the condenser
Before entering through the compressor
sum of the partial pressures of all divided by average molecular weight
sum of the partial pressure of all
greater of the partial pressure of all
average of the partial pressure of all
to produce cooling effect
to control the temperature refrigerated space
to convert refrigerant from liquid to vapour state
to control the flow of refrigerant
it has low latent heat
it is non-toxic
it is relatively cheap
it has low working pressure