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Performance of scroll expander for CO2 refrigeration cycle.

Author(s) : FUKUTA M., YANAGISAWA T., KOSUDA O., et al.

Summary

Since transcritical carbon dioxide refrigeration cycles have a large throttling loss, recovering the throttling loss by an expander is effective for improvement of the cycle performance. There are many types of expanders such as turbo, rotary vane, screw and scroll. Among them, the scroll machine is one of the expanders having a good performance. In this study, in order to examine the feasibility of the scroll expander for the carbon dioxide refrigeration cycle, the performance of the carbon dioxide scroll expander was investigated both theoretically and experimentally. Since leakage in the expander influences its performance greatly and is a transcritical flow from a supercritical to a two-phase region in the expander for the transcritical carbon dioxide refrigeration cycle, a calculation method of the transcritical leakage flow rate in the expander is discussed at first in the theoretical study. The calculation results showed that the total efficiency of the scroll expander becomes about 60% when the leakage gap size is 10 micro-m and the rotational speed is 3600 rpm. On the other hand, a prototype of scroll expander was made using a mechanical element of a scroll compressor for a water heater and its performance was measured. The volumetric efficiency of 80% was obtained and the total efficiency reached about 55%, even though the scroll element of the compressor was used without any major modifications.

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Details

  • Original title: Performance of scroll expander for CO2 refrigeration cycle.
  • Record ID : 2007-1941
  • Languages: English
  • Source: 2006 Purdue Conferences. 18th International Compressor Engineering Conference at Purdue & 11th International Refrigeration and Air-Conditioning Conference at Purdue [CD-ROM].
  • Publication date: 2006/07/17

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