Thermal transfer

Getting the basics right ...

Energy cannot be destroyed - it just changes form. This is the essence of the first law of thermodynamics, and central to the existence of matter.

Refrigeration, freezing and chilling are basically all about making the most of such thermal transfers, and the exploitation of temperature differences is central to the operation of heat pumps and heat exchangers.

In industry, commercial success and competitive advantage stem from how well you can exploit such energy transfers to produce a particular desired result - rather than just letting them go to waste, seeping away while your costs rise and your payoffs dwindle.

It's all a question of flow. Thermal energy is removed from an area by refrigerant passing through an evaporator in which the energy is absorbed by the refrigerant so that it vaporises.

When the refrigerant is compressed, heat is given off - and can be put to work in lots of different ways.