Describe the use of CFC’s as refrigerants and aerosol repellents- can you help me??

Question

I need to know how the CFC's work to cool things such as fridges and how they work in aerosols. Can anyone help me??

Answer 1

Propellents, not repellents.
They are pretty inert, and therefore can be pressurized in a spray can to force liquid out without reacting with it.
They are the "working fluid" (or were, due to ozone harm in the atmosphere they are phased out) that transports heat in an air conditioner or refrigerator.
It is a closed cycle, repeating.
The cool fluid is pumped through coils over which air to be cooled is blown, picking up heat from the air and cooling it. The now hot fluid goes into a compressor and is compressed, and into another coil where air or water cools it, taking heat with it (outside). You now have compressed cooled fluid.
It goes through a pressure reduction valve (regulator), further cooling it, and the cycle begins again.
Chlorofluorocarbons.

Answer 2

Helixerburger has given some good information. The particular CFCs used as refrigerants or aerosol propellants are gases which are liquid when compressed to moderate pressures. They are inert, non flammable and non toxic.

In aerosols the great increase in volume as the liquid CFC turns to vapour propells the product out of the aerosol can.

In refrigeration circuits evaporation of a refrigerant at a 'low' pressure takes in heat and condensation of the refrigerant at a higher pressure gives out heat. The refrigerant vapour from the evaporator is compressed and flows into the condenser where heat is given out as the refrigerant condenses, it then passes through a valve where the pressure is reduced and at lower pressure evaporates at a much lower temperature and produces the cooling effect.

The chlorine in chlorofluorocarbons damages the ozone and they are also strong greenhouse gases. There are alternatives, such as propane but this is flammable.