All cooling systems are dependent on the five thermal laws:
- Liquids absorb heat when changing from liquid to vapor state. Liquid bring warmth in the process of transition from vapor to liquid
- The temperature at which a change of state occurs is in a constant process of changes, provided the pressure remains constant.
- Heat flows only from the body, that is at a higher temperature to a body that is at a low temperature (hot, cold).
- The metal parts of the boiling and condensing units use metals, which have high thermal conductivity (copper, brass, aluminium).
- Thermal energy and other forms of energy are interchangeable. For example, electricity can be converted into heat, heat to electrical energy; and heat into mechanical energy.