Whether it is for preserving stocks and maintaining the sanitary and nutritional qualities of food, or for our comfort (air conditioning), producing cold has become essential for our society.
How to produce cold?
Whether it's a car refrigerator or air conditioning, the principle is the same: pump calories from the place you want to cool and get them out.
Heat transfer is possible thanks to certain properties of gases:
- the compression of a gas raises its temperature
- the condensation of a gas releases heat
- the expansion of a gas lowers its temperature
- the evaporation of a liquid requires a heat sample.
Thus, the compressor compresses the refrigerant, which increases the temperature of the gas. The compressed refrigerant enters the condenser. The circulation of the fluid in the gaseous state at high temperature in a lower temperature environment causes it to condense.
The holder, then, will allow to lower the fluid pressure, which will cause a drop-in temperature (down to -20 ° C). The cold refrigerant is then sent to the evaporator.