CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf)
The field of computational fluid dynamics has been rekindled by recent researchers to unleash this powerful tool to predict the ejector design, as well as to analyse and improve its performance. In this paper, CFD simulation was conducted to model a 2-D axisymmetric supersonic ejector using NIST rea...
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doaj-42658d041ad24b2a85716f18742d05cc2020-11-25T02:38:46ZengMDPI AGEnergies1996-10732020-03-01136140810.3390/en13061408en13061408CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf)Anas F A Elbarghthi0Saleh Mohamed1Van Vu Nguyen2Vaclav Dvorak3Department of Applied Mechanics, Faculty of Mechanical Engineering, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech RepublicDepartment of Mechanical and Materials Engineering, Masdar Institute, Khalifa University of Science and Technology, Abu Dhabi, UAEDepartment of Applied Mechanics, Faculty of Mechanical Engineering, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech RepublicDepartment of Applied Mechanics, Faculty of Mechanical Engineering, Technical University of Liberec, Studentská 1402/2, 46117 Liberec, Czech RepublicThe field of computational fluid dynamics has been rekindled by recent researchers to unleash this powerful tool to predict the ejector design, as well as to analyse and improve its performance. In this paper, CFD simulation was conducted to model a 2-D axisymmetric supersonic ejector using NIST real gas model integrated in ANSYS Fluent to probe the physical insight and consistent with accurate solutions. HFOs (1234ze(E) and 1234yf) were used as working fluids for their promising alternatives, low global warming potential (GWP), and adhering to EU Council regulations. The impact of different operating conditions, performance maps, and the Pareto frontier performance approach were investigated. The expansion ratio of both refrigerants has been accomplished in linear relationship using their critical compression ratio within ±0.30% accuracy. The results show that R1234yf achieved reasonably better overall performance than R1234ze(E). Generally, by increasing the primary flow inlet saturation temperature and pressure, the entrainment ratio will be lower, and this allows for a higher critical operating back pressure. Moreover, it was found out that increasing the degree of superheat for inlet primary flow by 25 K improved the entrainment ratio by almost 20.70% for R1234yf. Conversely, increasing the degree of superheat to the inlet secondary flow has a relativity negative impact on the performance. The maximum overall ejector efficiency reached was 0.372 and 0.364 for R1234yf and R1234ze(E) respectively. Comparing the results using ideal gas model, the ejector entrainment ratio was overestimated up to 50.26% for R1234yf and 25.66% for R1234ze(E) higher than using real gas model.https://www.mdpi.com/1996-1073/13/6/1408cfdr1234yfr1234ze(e)ejector cooling systemejector efficiencyreal gas model |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Anas F A Elbarghthi Saleh Mohamed Van Vu Nguyen Vaclav Dvorak |
spellingShingle |
Anas F A Elbarghthi Saleh Mohamed Van Vu Nguyen Vaclav Dvorak CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf) Energies cfd r1234yf r1234ze(e) ejector cooling system ejector efficiency real gas model |
author_facet |
Anas F A Elbarghthi Saleh Mohamed Van Vu Nguyen Vaclav Dvorak |
author_sort |
Anas F A Elbarghthi |
title |
CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf) |
title_short |
CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf) |
title_full |
CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf) |
title_fullStr |
CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf) |
title_full_unstemmed |
CFD Based Design for Ejector Cooling System Using HFOS (1234ze(E) and 1234yf) |
title_sort |
cfd based design for ejector cooling system using hfos (1234ze(e) and 1234yf) |
publisher |
MDPI AG |
series |
Energies |
issn |
1996-1073 |
publishDate |
2020-03-01 |
description |
The field of computational fluid dynamics has been rekindled by recent researchers to unleash this powerful tool to predict the ejector design, as well as to analyse and improve its performance. In this paper, CFD simulation was conducted to model a 2-D axisymmetric supersonic ejector using NIST real gas model integrated in ANSYS Fluent to probe the physical insight and consistent with accurate solutions. HFOs (1234ze(E) and 1234yf) were used as working fluids for their promising alternatives, low global warming potential (GWP), and adhering to EU Council regulations. The impact of different operating conditions, performance maps, and the Pareto frontier performance approach were investigated. The expansion ratio of both refrigerants has been accomplished in linear relationship using their critical compression ratio within ±0.30% accuracy. The results show that R1234yf achieved reasonably better overall performance than R1234ze(E). Generally, by increasing the primary flow inlet saturation temperature and pressure, the entrainment ratio will be lower, and this allows for a higher critical operating back pressure. Moreover, it was found out that increasing the degree of superheat for inlet primary flow by 25 K improved the entrainment ratio by almost 20.70% for R1234yf. Conversely, increasing the degree of superheat to the inlet secondary flow has a relativity negative impact on the performance. The maximum overall ejector efficiency reached was 0.372 and 0.364 for R1234yf and R1234ze(E) respectively. Comparing the results using ideal gas model, the ejector entrainment ratio was overestimated up to 50.26% for R1234yf and 25.66% for R1234ze(E) higher than using real gas model. |
topic |
cfd r1234yf r1234ze(e) ejector cooling system ejector efficiency real gas model |
url |
https://www.mdpi.com/1996-1073/13/6/1408 |
work_keys_str_mv |
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