The figure shows a heat engine (HE) working between two reservoirs. The amount of heat (Q₂) rejected by the heat engine is drawn by a heat pump (HP). The heat pump receives the entire work output (W) of the heat engine. If temperatures.
T₁ > T₃ > T₂, then the relation between the efficiency (η) of the heat engine and the coefficient of performance (COP) of the heat pump is