Second-law-based performance evaluation of cooling towers and evaporative heat exchangers
Abstract In this paper, we present thermodynamic analysis of counter flow wet cooling towers and evaporative heat exchangers using both the first and second laws of thermodynamics. A parametric study is carried out to determine the variation of second-law efficiency as well as exergy destruction as...
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2020
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| Online Access: | https://eprints.kfupm.edu.sa/id/eprint/525/1/second_law_based.pdf |
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| _version_ | 1864513388826066944 |
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| author | QURESHI, BILAL AHMED |
| author2 | ZUBAIR, SYED M. unknown |
| author2_role | author author |
| author_facet | QURESHI, BILAL AHMED ZUBAIR, SYED M. unknown |
| author_role | author |
| dc.creator.none.fl_str_mv | QURESHI, BILAL AHMED ZUBAIR, SYED M. unknown |
| dc.date.*.fl_str_mv | 2020 |
| dc.format.none.fl_str_mv | application/pdf |
| dc.identifier.none.fl_str_mv | https://eprints.kfupm.edu.sa/id/eprint/525/1/second_law_based.pdf Second-law-based performance evaluation of cooling towers and evaporative heat exchangers. INTERNATIONAL JOURNAL OF THERMAL SCIENCES 46 (2) 2006. |
| dc.language.none.fl_str_mv | en |
| dc.relation.none.fl_str_mv | https://eprints.kfupm.edu.sa/id/eprint/525/ |
| dc.rights.*.fl_str_mv | info:eu-repo/semantics/openAccess |
| dc.subject.none.fl_str_mv | Mechanical |
| dc.title.none.fl_str_mv | Second-law-based performance evaluation of cooling towers and evaporative heat exchangers |
| dc.type.none.fl_str_mv | Article PeerReviewed info:eu-repo/semantics/publishedVersion info:eu-repo/semantics/article |
| description | Abstract In this paper, we present thermodynamic analysis of counter flow wet cooling towers and evaporative heat exchangers using both the first and second laws of thermodynamics. A parametric study is carried out to determine the variation of second-law efficiency as well as exergy destruction as a function of various input parameters such as inlet wet bulb temperature. Irreversible losses are determined by applying an exergy balance on each of the systems investigated. In this regard, an engineering equation solver (EES) program, with built-in functions for most thermodynamic and transport properties, is used. The concept of total exergy as the sum of thermomechanical and chemical parts is employed in calculating the flow exergies for air and water vapor mixtures. For the different input variables investigated, efficiencies were, almost always, seen to increase or decrease monotonically. We notice that an increase in the inlet wet bulb temperature invariably increases the second-law efficiency of all the heat exchangers. Also, it is shown that Bejan’s definition of second-law efficiency is not limited in evaluating performance. Furthermore, it is understood that the variation in the dead state does not significantly affect the overall efficiency of the system. © 2006 Elsevier Masson SAS. All rights reserved. Keywords: Exergy; Evaporative cooler; Evaporative condenser; Dead state |
| eu_rights_str_mv | openAccess |
| format | article |
| id | KFUPM_4c8e429b960b0211c5d51dabd417c686 |
| identifier_str_mv | Second-law-based performance evaluation of cooling towers and evaporative heat exchangers. INTERNATIONAL JOURNAL OF THERMAL SCIENCES 46 (2) 2006. |
| language_invalid_str_mv | en |
| network_acronym_str | KFUPM |
| network_name_str | King Fahd University of Petroleum and Minerals |
| oai_identifier_str | oai::525 |
| publishDate | 2020 |
| repository.mail.fl_str_mv | |
| repository.name.fl_str_mv | |
| repository_id_str | |
| spelling | Second-law-based performance evaluation of cooling towers and evaporative heat exchangersQURESHI, BILAL AHMEDZUBAIR, SYED M.unknownMechanicalAbstract In this paper, we present thermodynamic analysis of counter flow wet cooling towers and evaporative heat exchangers using both the first and second laws of thermodynamics. A parametric study is carried out to determine the variation of second-law efficiency as well as exergy destruction as a function of various input parameters such as inlet wet bulb temperature. Irreversible losses are determined by applying an exergy balance on each of the systems investigated. In this regard, an engineering equation solver (EES) program, with built-in functions for most thermodynamic and transport properties, is used. The concept of total exergy as the sum of thermomechanical and chemical parts is employed in calculating the flow exergies for air and water vapor mixtures. For the different input variables investigated, efficiencies were, almost always, seen to increase or decrease monotonically. We notice that an increase in the inlet wet bulb temperature invariably increases the second-law efficiency of all the heat exchangers. Also, it is shown that Bejan’s definition of second-law efficiency is not limited in evaluating performance. Furthermore, it is understood that the variation in the dead state does not significantly affect the overall efficiency of the system. © 2006 Elsevier Masson SAS. All rights reserved. Keywords: Exergy; Evaporative cooler; Evaporative condenser; Dead stateArticlePeerReviewedinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleapplication/pdfhttps://eprints.kfupm.edu.sa/id/eprint/525/1/second_law_based.pdf Second-law-based performance evaluation of cooling towers and evaporative heat exchangers. INTERNATIONAL JOURNAL OF THERMAL SCIENCES 46 (2) 2006. enhttps://eprints.kfupm.edu.sa/id/eprint/525/2020info:eu-repo/semantics/openAccessoai::5252019-11-01T13:24:15Z |
| spellingShingle | Second-law-based performance evaluation of cooling towers and evaporative heat exchangers QURESHI, BILAL AHMED Mechanical |
| status_str | publishedVersion |
| title | Second-law-based performance evaluation of cooling towers and evaporative heat exchangers |
| title_full | Second-law-based performance evaluation of cooling towers and evaporative heat exchangers |
| title_fullStr | Second-law-based performance evaluation of cooling towers and evaporative heat exchangers |
| title_full_unstemmed | Second-law-based performance evaluation of cooling towers and evaporative heat exchangers |
| title_short | Second-law-based performance evaluation of cooling towers and evaporative heat exchangers |
| title_sort | Second-law-based performance evaluation of cooling towers and evaporative heat exchangers |
| topic | Mechanical |
| url | https://eprints.kfupm.edu.sa/id/eprint/525/1/second_law_based.pdf |