Generalized Performance Characteristics of Refrigeration and Heat Pump Systems

Figure 1

Cooling rate versus coefficient of performance for the endoreversible heat pump model where finite heat transfer rate is the sole source of losses (dashed curve) and for real refrigeration systems (solid curve). There are four distinct limiting operation points for real systems: The open circuit limit (heat leak dominated); maximum 𝑤 (coefficient of performance); maximum 𝑟 (cooling rate); the short circuit limit (friction dominated).