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Development and performance mapping of a multi-ejector expansion work recovery pack for R744 vapour compression units.

Author(s) : BANASIAK K., HAFNER A., KRIEZI E. E., et al.

Type of article: Article, IJR article

Summary

A multi-ejector expansion pack, intended as a substitute for a standard high-pressure electronic expansion valve (HPV), was designed, manufactured and experimentally investigated. Four different ejector cartridges were sized to enable a discrete opening characteristic with a binary profile for a parallel-compression R744 system. The system is rated for 70 kW at a 35°C gas cooler outlet temperature and a -3°C evaporation temperature. High values of ejector efficiency, exceeding 0.3 over a broad operation range, were recorded for all four of the cartridges tested under vapour compression conditions. The applicability of the multi-ejector pack as a main flashing device was verified experimentally. Similar profiles of the discharge pressure control error were recorded for both alternative options: expansion purely in the HPV vs. HPV-assisted expansion in the multi-ejector pack.

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Pages: 265-276

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Details

  • Original title: Development and performance mapping of a multi-ejector expansion work recovery pack for R744 vapour compression units.
  • Record ID : 30015237
  • Languages: English
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 57
  • Publication date: 2015/09

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