A Flexible Top-Down Numerical Modeling of an Air-Cooled Finned-Tube CO<sub>2</sub> Trans-Critical Gas Cooler

Carbon dioxide trans-critical refrigeration systems have been deeply investigated over the last years, with the aim to improve their performance by using several possible technical solutions. However, most of them lead to a more complex and expensive system, and therefore a trade-off is always neede...

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Autores principales:	Angelo Maiorino, Ciro Aprea, Manuel Gesù Del Duca
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	CO<sub>2</sub> refrigeration heat exchanger modeling finned-tube design decomposition Technology T
Acceso en línea:	https://doaj.org/article/c32011b996db4231ade38e9b28fbe9b8
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id	oai:doaj.org-article:c32011b996db4231ade38e9b28fbe9b8
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spelling	oai:doaj.org-article:c32011b996db4231ade38e9b28fbe9b82021-11-25T17:27:11ZA Flexible Top-Down Numerical Modeling of an Air-Cooled Finned-Tube CO<sub>2</sub> Trans-Critical Gas Cooler10.3390/en142276071996-1073https://doaj.org/article/c32011b996db4231ade38e9b28fbe9b82021-11-01T00:00:00Zhttps://www.mdpi.com/1996-1073/14/22/7607https://doaj.org/toc/1996-1073Carbon dioxide trans-critical refrigeration systems have been deeply investigated over the last years, with the aim to improve their performance by using several possible technical solutions. However, most of them lead to a more complex and expensive system, and therefore a trade-off is always needed to identify the best viable solution. Therefore, many efforts have also been focused on the study of a critical component of the basic carbon dioxide trans-critical cycle, which is the gas cooler, especially by numerical simulations. This work shows a new flexible approach to numerically model an air-cooled finned-tube CO<sub>2</sub> trans-critical gas cooler integrating a Top-Down methodology with a Finite Difference Method to solve the governing equation of the thermodynamic processes involved. The model was developed to reproduce the behavior of an experimental CO<sub>2</sub> refrigeration system, which provided the experimental data used for its validation. In detail, the model showed a good agreement with the experimental data, with average deviations of 1 K (0.3%), 0.9 bar (1%) and 0.15 kW (2.8%) regarding the refrigerant outlet temperature, the refrigerant outlet pressure and the rejected heat, respectively. The Top-Down numerical approach slightly outperformed the performance of previous numerical models available in the literature. Furthermore, the analysis of the refrigerant temperature and pressure along the tubes and rows also shows that the model can reproduce their behavior consistently and accordingly to data reported in the literature. The proposed approach can be used for detailed thermo-economic analysis of the whole refrigeration system, with the aim to optimize the design of the gas cooler.Angelo MaiorinoCiro ApreaManuel Gesù Del DucaMDPI AGarticleCO<sub>2</sub> refrigerationheat exchangermodelingfinned-tubedesigndecompositionTechnologyTENEnergies, Vol 14, Iss 7607, p 7607 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	CO<sub>2</sub> refrigeration heat exchanger modeling finned-tube design decomposition Technology T
spellingShingle	CO<sub>2</sub> refrigeration heat exchanger modeling finned-tube design decomposition Technology T Angelo Maiorino Ciro Aprea Manuel Gesù Del Duca A Flexible Top-Down Numerical Modeling of an Air-Cooled Finned-Tube CO<sub>2</sub> Trans-Critical Gas Cooler
description	Carbon dioxide trans-critical refrigeration systems have been deeply investigated over the last years, with the aim to improve their performance by using several possible technical solutions. However, most of them lead to a more complex and expensive system, and therefore a trade-off is always needed to identify the best viable solution. Therefore, many efforts have also been focused on the study of a critical component of the basic carbon dioxide trans-critical cycle, which is the gas cooler, especially by numerical simulations. This work shows a new flexible approach to numerically model an air-cooled finned-tube CO<sub>2</sub> trans-critical gas cooler integrating a Top-Down methodology with a Finite Difference Method to solve the governing equation of the thermodynamic processes involved. The model was developed to reproduce the behavior of an experimental CO<sub>2</sub> refrigeration system, which provided the experimental data used for its validation. In detail, the model showed a good agreement with the experimental data, with average deviations of 1 K (0.3%), 0.9 bar (1%) and 0.15 kW (2.8%) regarding the refrigerant outlet temperature, the refrigerant outlet pressure and the rejected heat, respectively. The Top-Down numerical approach slightly outperformed the performance of previous numerical models available in the literature. Furthermore, the analysis of the refrigerant temperature and pressure along the tubes and rows also shows that the model can reproduce their behavior consistently and accordingly to data reported in the literature. The proposed approach can be used for detailed thermo-economic analysis of the whole refrigeration system, with the aim to optimize the design of the gas cooler.
format	article
author	Angelo Maiorino Ciro Aprea Manuel Gesù Del Duca
author_facet	Angelo Maiorino Ciro Aprea Manuel Gesù Del Duca
author_sort	Angelo Maiorino
title	A Flexible Top-Down Numerical Modeling of an Air-Cooled Finned-Tube CO<sub>2</sub> Trans-Critical Gas Cooler
title_short	A Flexible Top-Down Numerical Modeling of an Air-Cooled Finned-Tube CO<sub>2</sub> Trans-Critical Gas Cooler
title_full	A Flexible Top-Down Numerical Modeling of an Air-Cooled Finned-Tube CO<sub>2</sub> Trans-Critical Gas Cooler
title_fullStr	A Flexible Top-Down Numerical Modeling of an Air-Cooled Finned-Tube CO<sub>2</sub> Trans-Critical Gas Cooler
title_full_unstemmed	A Flexible Top-Down Numerical Modeling of an Air-Cooled Finned-Tube CO<sub>2</sub> Trans-Critical Gas Cooler
title_sort	flexible top-down numerical modeling of an air-cooled finned-tube co<sub>2</sub> trans-critical gas cooler
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/c32011b996db4231ade38e9b28fbe9b8
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A Flexible Top-Down Numerical Modeling of an Air-Cooled Finned-Tube CO<sub>2</sub> Trans-Critical Gas Cooler

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