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Thermodynamic modelling and parameter determination of ejector for ejection refrigeration systems Modélisation thermodynamique et détermination des paramètres de l'éjecteur pour des systèmes frigorifiques à éjection

Lookup NU author(s): Dr Zhiwei Ma, Dr Huashan Bao, Professor Tony Roskilly

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).

Abstract

© 2016 The Authors This paper presents a detailed thermodynamic modelling method of an ejector for ejection refrigeration system. In this model, the primary flow in the ejector was assumed to fan out from the nozzle without mixing with the secondary flow in a certain downstream distance, so that a hypothetical throat was formed where the secondary flow reached the sound speed. However, the area of this hypothetical throat remained unknown. Therefore, based on several sets of experimental results, the present study developed empirical correlations of the hypothetical throat area to aid further modelling. The ratio of the hypothetical throat area to the mixing area was correlated with two dimensionless variables: one was the ratio of nozzle throat area to the mixing area, and the other one was the primary and secondary flow pressure ratio. The model has been validated by the measured primary mass flow rates and the critical back pressures.

Publication metadata

Author(s): Ma Z, Bao H, Roskilly AP

Publication type: Article

Publication status: Published

Journal: International Journal of Refrigeration

Year: 2017

Volume: 75

Pages: 117-128

Print publication date: 01/03/2017

Online publication date: 13/12/2016

Acceptance date: 07/12/2016

Date deposited: 15/05/2017

ISSN (print): 0140-7007

Publisher: Elsevier Ltd

URL: http://doi.org/10.1016/j.ijrefrig.2016.12.005

DOI: 10.1016/j.ijrefrig.2016.12.005

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