The Maths of Efficiency


Working out how fluids and gases behave


To measure and improve the efficiency of a system we use the principles of Pressure Enthalpy. Enthalpy is the term used to describe the amount of energy a substance holds. It is based on a defined value at a certain pressure and temperature. The key to understanding a typical refrigeration process is mastery of the Pressure Enthalpy Diagram.  The videos and links below help to explain how the diagram works. We have also included some guides to efficiency calculations and a quiz at the end to test your understanding.  (Contains external links).

Getting s uperheat and subcooling

Refrigerant Matters

Games and tests