Basic Characteristics of Small Radial Piston Type Expander

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  • FUKUTA Mitsuhiro
    Department of Mechanical Engineering, Faculty of Engineering, Shizuoka University
  • ANZAI Fumiya
    Graduate school of engineering, Shizuoka University
  • MOTOZAWA Masaaki
    Department of Mechanical Engineering, Faculty of Engineering, Shizuoka University
  • YANAGISAWA Tadashi
    Department of Mechanical Engineering, Faculty of Engineering, Shizuoka University

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Other Title
  • 小型ラジアルピストン型膨張機の基本特性
  • コガタ ラジアルピストンガタ ボウチョウキ ノ キホン トクセイ

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Since a throttling loss of CO2 refrigeration cycle is relatively large, various types of expanders have been investigated to recover the throttling loss. However, the capacity of the expander developed so far is so large that it is unadaptable to a small cycle such as a vending machine. In this paper, a small radial piston type expander is designed to be operated with flow rate less than 5 kg/h and its performance is examined. In addition, leakage and friction at a piston seal which has large influence on the performance are also discussed. The developed expander can be operated with a small flow rate less than 5 kg/h and the total efficiency attains to 0.45 – 0.5. It is found that to reduce the leakage at the piston seal is more important than reducing the friction of the seal to get good performance.

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