high triiscibility with oil

low boiling point

good electrical conductor

large latent heat

condenser and expansion valve

compressor and evaporator

expansion valve and evaporator

compressor and condenser

strong solution to weak solution

weak solution to strong solution

strong solution to ammonia vapour

ammonia vapour to weak solution

1.25

0.8

0.5

0.25

critical pressure of refrigerant

much below critical pressure

much above critical pressure

near critical pressure