Abstract
The nondimensional rate of refrigeration 〈 H ̇ 〉 of pulse tubes is shown to have a maximum attainable value of 1/4. The analysis is based on a linearized model in which the regenerator is thermally perfect and has negligible dead volume. The temporal variations are taken to be sinusoidal. At maximum 〈 H ̇ 〉 , the coefficient of performance (COP) equals one-half the temperature ratio T c / T h across the regenerator. In general, COP is a fraction between 0 and 1 of T c / T h . The difference between the actual power provided at the driver side and the ideal power corresponding to COP= T c / T h is dissipated in the regenerator. The resulting heat is transported to the warm end of the regenerator, where it is removed as part of the total heat flow rate.
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