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Energy efficiency of combined compressor-ejector refrigeration/heat pump systems.

Energetska efikasnost kombiniranih kompresorsko-ejektorskih rashladnih sistema i toplinskih pumpi.

Number: 35

Author(s) : SAREVSKI M., SAREVSKI V.

Summary

A compression enhanced ejector system with utilization of low temperature heat, waste heat, solar energy or geothermal energy is proposed in this paper, as a mechanically efficient way for improvement of the ejector cycle. A combination of mechanical and thermal energies provides a wide range of design alternatives which should yield a competitive refrigeration system. Performance characteristics of the first compressor stage and the second ejector stage are analyzed and optimization of the inter-stage pressure and temperature can be realized according to criteria for maximum mechanical coefficient of performance (COPmech ) and maximum thermal coefficient of performance (COPth ). The influence of the operating conditions: evaporating, condensing, generating and inter-stage temperatures on the combined compressor - ejector refrigeration cycle performances is investigated. High coefficients of performance, thermal COPth from (0.6 – 0.8) up to (1.2 – 1.7) and mechanical COPmech from 8 up to 21, can be obtained with combined compressor – ejector refrigeration system, as an optimal refrigeration system for air conditioning application, suitable for utilization of low temperature heat and competitive with absorption systems.

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Pages: 8 p.

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Details

  • Original title: Energetska efikasnost kombiniranih kompresorsko-ejektorskih rashladnih sistema i toplinskih pumpi.
  • Record ID : 30013437
  • Languages: English
  • Source: Zbornik radova. 45. Medunarodnikongres i izložba o grejanju hladenju i klimatizaciji./ Proceedings. 45th International congress and exhibition on heating, refrigeration and air conditioning (HVAC&R).
  • Publication date: 2014/12/03

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