Experimental parametric investigation of vapor ejector for refrigeration applications

Michel Poirier, Daniel Giguère and Hristo Sapoundjiev

Energy, 2018, vol. 162, issue C, 1287-1300

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.

Keywords: Prototype; Ejector; Area ratio; Entrainment ratio; Temperature lift; Prototype; éjecteur; Rapport de surface; Taux d’entraînement; Saut de température (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (4)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:162:y:2018:i:c:p:1287-1300

DOI: 10.1016/j.energy.2018.08.034

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