Abstract
SYNOPSIS The influence of irreversibilities of the finite-rate heat transfer between the working substance and the external heat reservoirs and the regenerative loss in the regenerative processes, on the performance of a magnetic Stirling refrigerator, is considered. Based on a general expression of the magnetisation intensity of a ferromagnetic material and a class of heat-transfer laws, the fundamental optimum relations between the cooling rate and the coefficient of performance and between the power input and the coefficient of performance are derived. The general characteristic curves of the cycle are presented. The influence of heat-transfer laws on the performance of the cycle is discussed in detail. These results obtained here are very general. They include the optimal performance of not only a magnetic Stirling refrigeration cycle but also a magnetic Carnot refrigeration cycle.
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