BOYLES LAW:Â PV/T= Constant
All heat pumps use the principle of Boyles law â that the temperature and vapour pressure of a substance are directly and proportionately related at a constant volume.
Since Volume (V), is almost certainly constant in a sealed heat pump Pressure (P) and Temperature (T) are the main variables and are hence related proportionally. If the Pressure is increased whilst the Volume stays the same the temperature must rise (absorbing the energy which creates the pressurisation in the form of heat = temperature rise).
Let’s look at some practical examples of this working