Abstract
A general cycle model including several major irreversibilities existing usually in real heat transformer systems is established and used to investigate the optimal performance of a heat transformer affected by the irreversibilities of finite-rate heat transfer between the working fluid and the external heat reservoirs, heat leak losses of the heated space, and internal dissipation of the working fluid. The coefficient of performance and the specific heating load of the cycle system are used in turn as objective functions for optimization. The maximum values of these parameters are calculated for a given total heat-transfer area of heat exchangers. The dimensionless specific heating load versus coefficient of performance curves describing the general performance characteristics of heat transformers are presented. The practical operating region of the heat transformer is discussed.
Published Version
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