Measurement of the steady-state performance of electrically operated systems, including ground-source heat pumps. It is the ratio of useful-energy output to purchased-energy input. Can also refer to gas-fired systems.

A ratio of the work or useful energy output of a system versus the amount of work or energy inputted into the system as determined by using the same energy equivalents for energy in and out. Is used as a measure of the steady state performance or energy efficiency of heating, cooling, and refrigeration appliances. The COP is equal to the Energy Efficiency Ratio (EER) divided by 3.41(2) The higher the COP, the more efficient the device.

The ratio of total useful work output by a machine to the net energy input. Units must be consistent.

ratio of the heat extracted from a cold reservoir to the work done to extract the heat (see equation 13.5a)

Heating capacity divided by electrical energy consumed. ( e.g.15 kW output / 4.5 kW input = COP of 3.3) The coefficient of performance of a heating system is the electrical ratio of the heat we get out divided by the heat we put in.

A measure of the performance of a heat pump. It is defined as the amount of heat the pump moves, divided by the energy it took to run the pump. COP's can range from 1 to 10 or higher.

The ratio of usable output energy divided by input energy.

The ratio of the rate of heat removal to the rate of energy input, in consistent units, for a complete refrigeration system or some specific portion of that system under designated operating conditions.

a measure of the efficiency of a heating appliance, calculated by dividing the heat output by the energy input.

a measure of the efficiency of an air-conditioning appliance, calculated by dividing the cooling output by the energy input.

COP): Used to rate the performance of a heat pump, the COP is the ratio of the rate of useful heat output delivered by the complete heat pump unit (exclusive of supplementary heating) to the corresponding rate of energy input, in consistent units and under specific conditions.

The ratio of work or energy applied as compared to the energy used.

The coefficient of performance, or COP (sometimes CP), of a heat pump is the ratio of the output heat to the supplied work or