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In this paper a thermally coupled Stirling-type two-stage pulse tube
cryocoolers (TSPTC) is studied using a one-dimensional (1-D) CFD code.
After validating the results of the simulations, effects of synchronous
utilization of multi-mesh regenerator and double-inlet on the performance
of the TSPTC are investigated. Results of simulations show that
non-oscillating friction factors do not possess sufficient accuracy for
calculation of oscillating friction losses in non-porous media. Whereas,
using oscillating friction factor of non-porous media leads to sufficient
accurate results. According to the results, using multi-mesh regenerator
and double-inlet increases the COP and decreases the minimum attainable
temperature of the system. It is observed that a minimum temperature of
18.2K is attainable using optimum multi-mesh regenerator and double-inlet;
whereas, for a simple TSPTC with a uniform mesh regenerator, a minimum
temperature of 26.4K is concluded.
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