Abstract
Over the past several years, much interest has been devoted to the development of pulse tube refrigerators. But, the applicability of pulse tube refrigerators for the high cooling temperature region has not been studied until now, because basically the expansion work of pulse tube refrigerators can not be recovered. In this paper, we suggest the new type of the pulse tube refrigerator. It is the series type pulse tube refrigerator that has some pulse tubes to be connected in series. We attempt to make clear the characteristics of the series type refrigerator by employing the numerical cycle simulation based on a nodal analysis. The results prove that the series type pulse tube refrigerator has a high potential for the high cooling temperature use of the refrigerators.
