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Flow characteristics, modeling and simulation of single-phase and two-phase ejectors.

Strujne karakteristike, modeliranje i simulacija jednofaznih i dvofaznih ejektora.

Number: 15

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

Summary

A review on implementation of the ejector thermo compression in refrigeration systems and heat pumps is presented in this paper. Thermal, flow and performance characteristics of the refrigeration single-phase and two-phase ejectors are analyzed. A calculating procedure for estimation of the main parameters and performance characteristics of the ejectors is presented. The two main sources of thermodynamic irreversibility: the process of momentum transfer in the mixing section and shock waves, or dispersed shock waves, or pseudo-shock waves in the fluid flow field are discussed. The shock waves are feature for gas and dry vapor fluid flow; dispersed shock waves are feature for dominantly vapor two-phase fluid flow; pseudo-shock waves are feature for dominantly liquid two-phase fluid flow. With appropriate choice of refrigerant and with optimal design of the ejector flow field elements the ejector systems can be successfully applied in various refrigeration / heat pump systems, and in combined (hybrid) and polygeneration thermal systems for utilization of low temperature heat, geothermal energy, solar energy and waste heat.

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Pages: 11 p.

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Details

  • Original title: Strujne karakteristike, modeliranje i simulacija jednofaznih i dvofaznih ejektora.
  • Record ID : 30013421
  • 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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