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CFD and experimental evaluation of R744 transcritical gas cooler used in solar assisted heat pump system

In this paper, a helical coil tube in tube heat exchanger was designed and used in carbon dioxide solar assisted heat pump system (SAHP) to provide hot water for domestic applications and to operate an air gap membrane desalination (AGMD) unit. Both theoretical and experimental studies to investigat...

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Main Authors: Baradey, Yehya, Hawlader, Mohammad Nurul Alam, Hrairi, Meftah, Hafner, A, Gomes, Joao, Sider, Ishaq
格式: Article
語言:English
出版: Elixir 2020
主題:
TJ807 Renewable energy sources
在線閱讀:http://irep.iium.edu.my/99657/1/99657_CFD%20and%20experimental%20evaluation.pdf
http://irep.iium.edu.my/99657/
https://www.elixirpublishers.com/articles/1598433748_ELIXIR2020066673B.pdf
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spelling my.iium.irep.996572022-08-28T07:53:42Z http://irep.iium.edu.my/99657/ CFD and experimental evaluation of R744 transcritical gas cooler used in solar assisted heat pump system Baradey, Yehya Hawlader, Mohammad Nurul Alam Hrairi, Meftah Hafner, A Gomes, Joao Sider, Ishaq TJ807 Renewable energy sources In this paper, a helical coil tube in tube heat exchanger was designed and used in carbon dioxide solar assisted heat pump system (SAHP) to provide hot water for domestic applications and to operate an air gap membrane desalination (AGMD) unit. Both theoretical and experimental studies to investigate the performance of the gas cooler with Glycol Ethylene 50% and water as coolants were performed. The experimental part to study the behavior of the carbon dioxide in the supercritical region was conducted on the R744 heat pump test rig located at Department of Energy and Process Engineering –NTNU. On the other hand, FEA using ANSYS Fluent 18.1 was used to conduct the theoretical analysis. The study includes effect of inlet temperature of both coolants, effect of discharge pressure, effect of mass flow rate of water, and logarithmic mean temperature difference (LMTD). Good agreements between Experimental and simulation results were achieved. Results showed that the outlet temperature of the refrigerant from the gas cooler decreased from 81 °C to 40 °C, with 0.085 bar average pressure drop due to the heat rejection process. The outlet temperature of the refrigerant from the gas cooler in case of water is 8 °C lower than with ethylene glycol 50%. The outlet temperature of water reached 57 °C which is enough for domestic applications and to operate the AGMD unit to produce fresh water. It is observed that the pressure drop in the refrigerant by using water as coolant is higher by 0.2 bar than when ethylene glycol 50% used. Results also revealed that the value of LMTD of the gas cooler using ethylene glycol 50% is 24.3 % higher than the LMTD value when using water. Elixir 2020 Article PeerReviewed application/pdf en http://irep.iium.edu.my/99657/1/99657_CFD%20and%20experimental%20evaluation.pdf Baradey, Yehya and Hawlader, Mohammad Nurul Alam and Hrairi, Meftah and Hafner, A and Gomes, Joao and Sider, Ishaq (2020) CFD and experimental evaluation of R744 transcritical gas cooler used in solar assisted heat pump system. Elixir Mechanical Engineering, 145. pp. 54726-54733. ISSN 2229-712L https://www.elixirpublishers.com/articles/1598433748_ELIXIR2020066673B.pdf
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
topic TJ807 Renewable energy sources
spellingShingle TJ807 Renewable energy sources
Baradey, Yehya
Hawlader, Mohammad Nurul Alam
Hrairi, Meftah
Hafner, A
Gomes, Joao
Sider, Ishaq
CFD and experimental evaluation of R744 transcritical gas cooler used in solar assisted heat pump system
description In this paper, a helical coil tube in tube heat exchanger was designed and used in carbon dioxide solar assisted heat pump system (SAHP) to provide hot water for domestic applications and to operate an air gap membrane desalination (AGMD) unit. Both theoretical and experimental studies to investigate the performance of the gas cooler with Glycol Ethylene 50% and water as coolants were performed. The experimental part to study the behavior of the carbon dioxide in the supercritical region was conducted on the R744 heat pump test rig located at Department of Energy and Process Engineering –NTNU. On the other hand, FEA using ANSYS Fluent 18.1 was used to conduct the theoretical analysis. The study includes effect of inlet temperature of both coolants, effect of discharge pressure, effect of mass flow rate of water, and logarithmic mean temperature difference (LMTD). Good agreements between Experimental and simulation results were achieved. Results showed that the outlet temperature of the refrigerant from the gas cooler decreased from 81 °C to 40 °C, with 0.085 bar average pressure drop due to the heat rejection process. The outlet temperature of the refrigerant from the gas cooler in case of water is 8 °C lower than with ethylene glycol 50%. The outlet temperature of water reached 57 °C which is enough for domestic applications and to operate the AGMD unit to produce fresh water. It is observed that the pressure drop in the refrigerant by using water as coolant is higher by 0.2 bar than when ethylene glycol 50% used. Results also revealed that the value of LMTD of the gas cooler using ethylene glycol 50% is 24.3 % higher than the LMTD value when using water.
format Article
author Baradey, Yehya
Hawlader, Mohammad Nurul Alam
Hrairi, Meftah
Hafner, A
Gomes, Joao
Sider, Ishaq
author_facet Baradey, Yehya
Hawlader, Mohammad Nurul Alam
Hrairi, Meftah
Hafner, A
Gomes, Joao
Sider, Ishaq
author_sort Baradey, Yehya
title CFD and experimental evaluation of R744 transcritical gas cooler used in solar assisted heat pump system
title_short CFD and experimental evaluation of R744 transcritical gas cooler used in solar assisted heat pump system
title_full CFD and experimental evaluation of R744 transcritical gas cooler used in solar assisted heat pump system
title_fullStr CFD and experimental evaluation of R744 transcritical gas cooler used in solar assisted heat pump system
title_full_unstemmed CFD and experimental evaluation of R744 transcritical gas cooler used in solar assisted heat pump system
title_sort cfd and experimental evaluation of r744 transcritical gas cooler used in solar assisted heat pump system
publisher Elixir
publishDate 2020
url http://irep.iium.edu.my/99657/1/99657_CFD%20and%20experimental%20evaluation.pdf
http://irep.iium.edu.my/99657/
https://www.elixirpublishers.com/articles/1598433748_ELIXIR2020066673B.pdf
_version_ 1743106846010376192
score 13.2509575

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