A Novel Generator Design Utilised for Conventional Ejector Refrigeration Systems

Ejector refrigeration systems are rapidly evolving and are poised to become one of the most preferred cooling systems in the near future. CO<sub>2</sub> transcritical refrigeration systems have inherently high working pressures and discharge temperatures, providing a large volumetric hea...

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Autores principales:	Anas F. A. Elbarghthi, Mohammad Yousef Hdaib, Václav Dvořák
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	ejector CO<sub>2</sub> plate heat exchanger refrigeration system pressure drop Technology T
Acceso en línea:	https://doaj.org/article/41a07e0afd834a228cffca2bad796be6
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spelling	oai:doaj.org-article:41a07e0afd834a228cffca2bad796be62021-11-25T17:28:06ZA Novel Generator Design Utilised for Conventional Ejector Refrigeration Systems10.3390/en142277051996-1073https://doaj.org/article/41a07e0afd834a228cffca2bad796be62021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7705https://doaj.org/toc/1996-1073Ejector refrigeration systems are rapidly evolving and are poised to become one of the most preferred cooling systems in the near future. CO<sub>2</sub> transcritical refrigeration systems have inherently high working pressures and discharge temperatures, providing a large volumetric heating capacity. In the current research, the heat ejected from the CO<sub>2</sub> gas cooler was proposed as a driving heating source for the compression ejector system, representing the energy supply for the generator in a combined cycle. The local design approach was investigated for the combined plate-type heat exchanger (PHE) via Matlab code integrated with the NIST real gas database. HFO refrigerants (1234ze(E) and 1234yf) were selected to serve as the cold fluid on the generator flowing through three different phases: subcooled liquid, a two-phase mixture, and superheated vapour. The study examines the following: the effectiveness, the heat transfer coefficients, and the pressure drop of the PHE working fluids under variable hot stream pressures, cold stream flow fluxes, and superheated temperatures. The integration revealed that the cold fluid mixture phase dominates the heat transfer coefficients and the pressure drop of the heat exchanger. By increasing the hot stream inlet pressure from 9 MPa to 12 MPa, the cold stream two-phase convection coefficient can be enhanced by 50% and 200% for R1234yf and R1234ze(E), respectively. Conversely, the cold stream two-phase convection coefficient dropped by 17% and 37% for R1234yf and R1234ze(E), respectively. The overall result supports utilising the ejected heat from the CO<sub>2</sub> transcritical system, especially at high CO<sub>2</sub> inlet pressures and low cold channel flow fluxes. Moreover, R1234ze(E) could be a more suitable working fluid because it possesses a lower pressure drop and bond number.Anas F. A. ElbarghthiMohammad Yousef HdaibVáclav DvořákMDPI AGarticleejectorCO<sub>2</sub>plate heat exchangerrefrigeration systempressure dropTechnologyTENEnergies, Vol 14, Iss 7705, p 7705 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	ejector CO<sub>2</sub> plate heat exchanger refrigeration system pressure drop Technology T
spellingShingle	ejector CO<sub>2</sub> plate heat exchanger refrigeration system pressure drop Technology T Anas F. A. Elbarghthi Mohammad Yousef Hdaib Václav Dvořák A Novel Generator Design Utilised for Conventional Ejector Refrigeration Systems
description	Ejector refrigeration systems are rapidly evolving and are poised to become one of the most preferred cooling systems in the near future. CO<sub>2</sub> transcritical refrigeration systems have inherently high working pressures and discharge temperatures, providing a large volumetric heating capacity. In the current research, the heat ejected from the CO<sub>2</sub> gas cooler was proposed as a driving heating source for the compression ejector system, representing the energy supply for the generator in a combined cycle. The local design approach was investigated for the combined plate-type heat exchanger (PHE) via Matlab code integrated with the NIST real gas database. HFO refrigerants (1234ze(E) and 1234yf) were selected to serve as the cold fluid on the generator flowing through three different phases: subcooled liquid, a two-phase mixture, and superheated vapour. The study examines the following: the effectiveness, the heat transfer coefficients, and the pressure drop of the PHE working fluids under variable hot stream pressures, cold stream flow fluxes, and superheated temperatures. The integration revealed that the cold fluid mixture phase dominates the heat transfer coefficients and the pressure drop of the heat exchanger. By increasing the hot stream inlet pressure from 9 MPa to 12 MPa, the cold stream two-phase convection coefficient can be enhanced by 50% and 200% for R1234yf and R1234ze(E), respectively. Conversely, the cold stream two-phase convection coefficient dropped by 17% and 37% for R1234yf and R1234ze(E), respectively. The overall result supports utilising the ejected heat from the CO<sub>2</sub> transcritical system, especially at high CO<sub>2</sub> inlet pressures and low cold channel flow fluxes. Moreover, R1234ze(E) could be a more suitable working fluid because it possesses a lower pressure drop and bond number.
format	article
author	Anas F. A. Elbarghthi Mohammad Yousef Hdaib Václav Dvořák
author_facet	Anas F. A. Elbarghthi Mohammad Yousef Hdaib Václav Dvořák
author_sort	Anas F. A. Elbarghthi
title	A Novel Generator Design Utilised for Conventional Ejector Refrigeration Systems
title_short	A Novel Generator Design Utilised for Conventional Ejector Refrigeration Systems
title_full	A Novel Generator Design Utilised for Conventional Ejector Refrigeration Systems
title_fullStr	A Novel Generator Design Utilised for Conventional Ejector Refrigeration Systems
title_full_unstemmed	A Novel Generator Design Utilised for Conventional Ejector Refrigeration Systems
title_sort	novel generator design utilised for conventional ejector refrigeration systems
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/41a07e0afd834a228cffca2bad796be6
work_keys_str_mv	AT anasfaelbarghthi anovelgeneratordesignutilisedforconventionalejectorrefrigerationsystems AT mohammadyousefhdaib anovelgeneratordesignutilisedforconventionalejectorrefrigerationsystems AT vaclavdvorak anovelgeneratordesignutilisedforconventionalejectorrefrigerationsystems AT anasfaelbarghthi novelgeneratordesignutilisedforconventionalejectorrefrigerationsystems AT mohammadyousefhdaib novelgeneratordesignutilisedforconventionalejectorrefrigerationsystems AT vaclavdvorak novelgeneratordesignutilisedforconventionalejectorrefrigerationsystems
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A Novel Generator Design Utilised for Conventional Ejector Refrigeration Systems

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