COSP (Coefficient of system performance)

The COSP of a heat pump is based on the total heat extracted (also referred to as Q) in relation to the energy supplied to the heat pump (also referred to as W).

Coefficient of system performance (COSP) is a term used to describe heat pump efficiency. The COSP of a heat pump is based on the total heat extracted (also referred to as Q) in relation to the energy supplied to the heat pump (also referred to as W). In contrast to COP, COSP is a description of the total (electrical) energy used by a heat pump in relation to the total work done (cooling or heating) by the pump.

COSP can therefore be defined as the electrical power in kW used to produce 1 kW of cooling.
COSP can thus be calculated using the formula to the right. COSP is expressed as a ratio.
The values of Q and W must therefore have the same unit in order for COSP to be calculated.





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