Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Design and performance analysis of a gerotor expander for power generation from waste heat

폐열회수 발전을 위한 지로터 팽창기 설계 및 성능해석

  • Park, Keun-Tae (Department of Mechanical Engineering, Incheon National University) ;
  • Kim, Yong-Hee (Department of Mechanical Engineering, Incheon National University) ;
  • Kim, Hyun-Jin (Department of Mechanical Engineering, Incheon National University)
  • Received : 2015.12.15
  • Accepted : 2016.03.21
  • Published : 2016.04.30
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Abstract

In this paper, the feasibility study on a gerotor type expander as a power converting device in a small scale power generation ORC system was made by performance analysis of the gerotor expander. Design of a 1kW-class gerotor expander was carried out and its performance was numerically simulated. For a R134a Rankine system with about 20 kW solar heat source, the gerotor expander efficiency was calculated to be 35~75% for the operating conditions of $Te=80{\sim}100^{\circ}C$ and $Tc=30{\sim}60^{\circ}C$. Maximum expander efficiency was obtained at an expansion ratio somewhat higher than the design expansion ratio due to pre-expansion during suction process inside the outer and inner rotor mate. If the operating expansion ratio is not far from the design expansion ratio, the gerotor expander performance can be well compared to that of a scroll type.

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References

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