The higher the number, the more efficient a heat pump is.
The efficiency of a heat pump is expressed as a coefficient of performance (COP), or seasonal coefficient of performance (SCOP). Large-scale heat pumps are also used in district heating systems. It has delivered some of its thermal energy, so returns colder than the environment, and can again take up energy from the air or the ground in the warm space, and repeat the cycle.Īir source heat pumps are the most common models, while other types include ground source heat pumps, water source heat pumps and exhaust air heat pumps. After being returned to the warmer space the refrigerant is decompressed - evaporated. Its thermal energy can be transferred to the cooler space. When in heating mode, a refrigerant at the warmer temperature is compressed, becoming hot.
As they transfer heat rather than generating heat, they are more energy-efficient than other ways of heating a home. In cold weather a heat pump can move heat from the cool outdoors to warm a house the pump may also be designed to move heat from the house to the warmer outdoors in warm weather. A heat pump is a device that uses work to transfer heat from a cool space to a warm space by transferring thermal energy using a refrigeration cycle, cooling the cool space and warming the warm space.
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