Heat pumps - Glossary

COP: Coefficient of Performance is the efficiency ratio of the amount of heating or cooling provided by a heating or cooling unit compared to the energy consumed by the system. A higher COP means that there is very little difference between the heat captured and the heat given back. Before you purchase your system, make sure to check the COP. It should be at least 3.3 to ensure good energy efficiency. Tax credits may also depend on the COP. Refrigerant: Heat transfer fluid. It’s best to chose a system that operates with environmentally-friendly refrigerants such as R407C, R134A, R410A and R417A. Evaporator: This is a heat exchanger in which the refrigerant is heated to the boiling point by the heat absorbed from the cold source. Compressor: This is a motor that takes in gas at low pressure and low temperature in the evaporator and compresses it to raise the temperature. Condenser: This is a heat exchanger where the gaseous refrigerant is liquefied under high pressure to give off heat. Expansion valve: This lowers the pressure of the condensed liquid (calibrated orifice), thereby lowering the temperature.



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