The Influence of Nusselt Correlation on Exergy Efficiency of a Plate Heat Exchanger Operating with TiO<sub>2</sub>:SiO<sub>2</sub>/EG:DI Hybrid Nanofluid
This paper studies how the correlation with the Nusselt number affects the final result of the efficiency, <i>ε</i>, and exergy efficiency, <i>η</i><sub>ex</sub>, of a chevron-type gasketed plate heat exchanger, which is installed in a typical small solar installa...
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| Format: | Article |
| Language: | English |
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MDPI AG
2024-01-01
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| Series: | Inventions |
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| Online Access: | https://www.mdpi.com/2411-5134/9/1/11 |
| _version_ | 1827343445982707712 |
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| author | Sylwia Wciślik |
| author_facet | Sylwia Wciślik |
| author_sort | Sylwia Wciślik |
| collection | DOAJ |
| description | This paper studies how the correlation with the Nusselt number affects the final result of the efficiency, <i>ε</i>, and exergy efficiency, <i>η</i><sub>ex</sub>, of a chevron-type gasketed plate heat exchanger, which is installed in a typical small solar installation dedicated to single-family housing; the solar fluid is a TiO<sub>2</sub>:SiO<sub>2</sub>/EG:DI hybrid nanofluid with concentrations from 0% to 1.5% vol. The experimental model assumes constant flow of the solar fluid and varies on the domestic hot water side—from 3 lpm to 6 lpm. The inlet temperatures are 30 °C and 60 °C on the cold and hot sides of the heat exchanger, respectively. Of the six analysed correlations that showed similar trends, it is concluded that for the assumed flow conditions, geometry, and chevron angle of the plate heat exchanger, one model is the most accurate. The largest difference between the <i>η</i><sub>ex</sub> values for a given concentration is 3.4%, so the exergy efficiency is not affected by the chosen Nusselt model by very much. However, the choice of correlation with the Nusselt number significantly affects the efficiency, <i>ε</i>; the difference between the values obtained within a given concentration is more than 40% and depends on the Reynolds number and flow. Most research discusses the scenario with the nanofluid as a coolant. This paper considers the opposite situation in which the solar fluid is a hotter working medium that transfers heat to domestic hot water installation. |
| first_indexed | 2024-03-07T22:27:21Z |
| format | Article |
| id | doaj.art-1f06d8d0bad64452b3b3f8fd65abe175 |
| institution | Directory Open Access Journal |
| issn | 2411-5134 |
| language | English |
| last_indexed | 2024-03-07T22:27:21Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Inventions |
| spelling | doaj.art-1f06d8d0bad64452b3b3f8fd65abe1752024-02-23T15:21:38ZengMDPI AGInventions2411-51342024-01-01911110.3390/inventions9010011The Influence of Nusselt Correlation on Exergy Efficiency of a Plate Heat Exchanger Operating with TiO<sub>2</sub>:SiO<sub>2</sub>/EG:DI Hybrid NanofluidSylwia Wciślik0Department of Building Physics and Renewable Energy, Faculty of Environmental Engineering, Geodesy and Renewable Energy, Kielce University of Technology, Aleja Tysiaclecia Panstwa Polskiego 7, 25-314 Kielce, PolandThis paper studies how the correlation with the Nusselt number affects the final result of the efficiency, <i>ε</i>, and exergy efficiency, <i>η</i><sub>ex</sub>, of a chevron-type gasketed plate heat exchanger, which is installed in a typical small solar installation dedicated to single-family housing; the solar fluid is a TiO<sub>2</sub>:SiO<sub>2</sub>/EG:DI hybrid nanofluid with concentrations from 0% to 1.5% vol. The experimental model assumes constant flow of the solar fluid and varies on the domestic hot water side—from 3 lpm to 6 lpm. The inlet temperatures are 30 °C and 60 °C on the cold and hot sides of the heat exchanger, respectively. Of the six analysed correlations that showed similar trends, it is concluded that for the assumed flow conditions, geometry, and chevron angle of the plate heat exchanger, one model is the most accurate. The largest difference between the <i>η</i><sub>ex</sub> values for a given concentration is 3.4%, so the exergy efficiency is not affected by the chosen Nusselt model by very much. However, the choice of correlation with the Nusselt number significantly affects the efficiency, <i>ε</i>; the difference between the values obtained within a given concentration is more than 40% and depends on the Reynolds number and flow. Most research discusses the scenario with the nanofluid as a coolant. This paper considers the opposite situation in which the solar fluid is a hotter working medium that transfers heat to domestic hot water installation.https://www.mdpi.com/2411-5134/9/1/11nanofluidsheat exchanger modellingNusselt number correlationheat transfer enhancement |
| spellingShingle | Sylwia Wciślik The Influence of Nusselt Correlation on Exergy Efficiency of a Plate Heat Exchanger Operating with TiO<sub>2</sub>:SiO<sub>2</sub>/EG:DI Hybrid Nanofluid Inventions nanofluids heat exchanger modelling Nusselt number correlation heat transfer enhancement |
| title | The Influence of Nusselt Correlation on Exergy Efficiency of a Plate Heat Exchanger Operating with TiO<sub>2</sub>:SiO<sub>2</sub>/EG:DI Hybrid Nanofluid |
| title_full | The Influence of Nusselt Correlation on Exergy Efficiency of a Plate Heat Exchanger Operating with TiO<sub>2</sub>:SiO<sub>2</sub>/EG:DI Hybrid Nanofluid |
| title_fullStr | The Influence of Nusselt Correlation on Exergy Efficiency of a Plate Heat Exchanger Operating with TiO<sub>2</sub>:SiO<sub>2</sub>/EG:DI Hybrid Nanofluid |
| title_full_unstemmed | The Influence of Nusselt Correlation on Exergy Efficiency of a Plate Heat Exchanger Operating with TiO<sub>2</sub>:SiO<sub>2</sub>/EG:DI Hybrid Nanofluid |
| title_short | The Influence of Nusselt Correlation on Exergy Efficiency of a Plate Heat Exchanger Operating with TiO<sub>2</sub>:SiO<sub>2</sub>/EG:DI Hybrid Nanofluid |
| title_sort | influence of nusselt correlation on exergy efficiency of a plate heat exchanger operating with tio sub 2 sub sio sub 2 sub eg di hybrid nanofluid |
| topic | nanofluids heat exchanger modelling Nusselt number correlation heat transfer enhancement |
| url | https://www.mdpi.com/2411-5134/9/1/11 |
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