Abstract
This chapter proposes a new method for achieving large refrigeration powers for some industrial applications. It proposes a new type of pulse tube refrigerator, termed pulse tube refrigerator with low temperature switching valve. Pulse tube refrigerator has been developing at an amazing speed Its refrigeration performance is now becoming comparable to that of G-M refrigerator or Stirling refrigerator. Therefore pulse tube refrigerator is finding more and more applications. It is suitable for industrial applications that require large refrigeration powers. In this kind of pulse tube refrigerator a recuperative heat exchanger instead of a regenerator is used and a switching valve is installed at the cold end of an orifice pulse tube. The adiabatic expansion efficiency of the orifice pulse tube with low temperature switching valve, which actually works as a new type of expander, has been experimentally investigated. Adiabatic efficiencies higher than 40% have been achieved in the preliminary experiments.
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