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Experimental parametric investigation of vapor ejector for refrigeration applications

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  • Poirier, Michel
  • Giguère, Daniel
  • Sapoundjiev, Hristo

Abstract

A prototype ejector system having a nominal cooling capacity of 30 kW was used to study the influence of ejector geometry and operating conditions on the ejector performance. Experiments were realized over a wide parameter range: primary inlet pressure from 1700 to 2900 kPa; secondary inlet pressure from 170 to 550 kPa; outlet pressure from 350 to 1000 kPa. The performance was evaluated in terms of the entrainment ratio and the temperature lift. The experimental results led to the following observations: (a) A simple calculation of the primary mass flow rate can be used for the design of ejector systems; (b) A given ejector operated at fixed primary inlet pressure shows a range of outlet pressures where the entrainment ratio is maximum. A correlation of the optimal entrainment ratio versus the primary pressure is proposed; (c) There is an inverse relationship between the temperature lift and the entrainment ratio; (d) For a fixed primary inlet pressure, the optimal outlet pressure can be set at a given value by the appropriate geometry of the ejector. Finally, a two-plateau behavior of entrainment ratio as a function of outlet pressure was observed, which might be related to an improper nozzle exit position.

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  • Poirier, Michel & Giguère, Daniel & Sapoundjiev, Hristo, 2018. "Experimental parametric investigation of vapor ejector for refrigeration applications," Energy, Elsevier, vol. 162(C), pages 1287-1300.
    • Handle: RePEc:eee:energy:v:162:y:2018:i:c:p:1287-1300
    DOI: 10.1016/j.energy.2018.08.034
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    References listed on IDEAS

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    1. Reddick, Christopher & Sorin, Mikhail & Rheault, Fernand, 2014. "Energy savings in CO2 (carbon dioxide) capture using ejectors for waste heat upgrading," Energy, Elsevier, vol. 65(C), pages 200-208.
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    Cited by:

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    4. Al-Nimr, Moh’d Ahmad & Tashtoush, Bourhan & Hasan, Alabas, 2020. "A novel hybrid solar ejector cooling system with thermoelectric generators," Energy, Elsevier, vol. 198(C).

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