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Practical Design Procedure of a Rotary Vane Expander for a Conventional Refrigeration System.

Number: pap. 1121

Author(s) : HUANG P. X., YONKERS S., GROLL E. A.

Summary

In recent years, expanders have been proposed to improve the energy efficiency of systems that are based on vapor compression refrigeration principles. In this study, a rotary vane expander is developed to improve the energy efficiency of an existing R22 heat pump system. One of the main advantages of rotary vane expanders is it requires no valve to control the fluid flow. The expander is developed by converting a commercially available automotive air conditioning 4-vane rotary compressor. A step-by-step procedure of this conversion is presented here. A mathematical model of the rotary vane machine is formulated to provide the required design parameters. It was found that the machine has a maximum volume ratio of 8.3. The expander is to be installed in series with an expansion valve into an existing R-22 heat pump system. The arrangement is expected to allow some degree of self-adjustment in the expansion process during operation, which can be a problem for an expander-only system. A simulation model of an existing R-22 heat pump system is developed to compute the expected performance of the concept. It was found that the expander-valve-in-series arrangement can improve the coefficients of performance (COPs) of the system by 4.3% and 3.5% on the cooling and heating sides, respectively. In comparison, with an expander-only arrangement, the improvements were 6.8% and 5.4% on the cooling and heating sides, respectively. From the parametric study, COP improvements of between 4-8% and 3-7% in cooling and heating, respectively, are expected at various evaporating and condensing temperatures studied. COP improvements are higher with increasing evaporating and condensing temperatures.

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Pages: 9

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Details

  • Original title: Practical Design Procedure of a Rotary Vane Expander for a Conventional Refrigeration System.
  • Record ID : 30024219
  • Languages: English
  • Source: 2018 Purdue Conferences. 24th International Compressor Engineering Conference at Purdue.
  • Publication date: 2018/07/09

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