Numerical Study on the Effects of Extended Surfaces on the Performance of a Coaxial Geothermal Heat Exchanger
In this study, the effect of expanded surfaces on the performance of a vertical coaxial geothermal heat exchanger has been investigated. The fluid (water) with an initial temperature of 3.5 ºC and a volumetric flow rate of 0.0008 m3/s enters from the annular area and exits from the middle pipe. The...
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Semnan University
2024-04-01
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| Series: | مجله مدل سازی در مهندسی |
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| Online Access: | https://modelling.semnan.ac.ir/article_8085_6e3d257c1d27beb00ac3e5a4b00af3ff.pdf |
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| author | Naser Bakhshi Saman Rashidi Roohollah Rafee |
| author_facet | Naser Bakhshi Saman Rashidi Roohollah Rafee |
| author_sort | Naser Bakhshi |
| collection | DOAJ |
| description | In this study, the effect of expanded surfaces on the performance of a vertical coaxial geothermal heat exchanger has been investigated. The fluid (water) with an initial temperature of 3.5 ºC and a volumetric flow rate of 0.0008 m3/s enters from the annular area and exits from the middle pipe. The simulation is done for the heat absorption mode. The SST k-ω turbulence model is used for simulation of the turbulent flow. The thermal performance of the heat exchanger has been improved by placing ribs and dimples with several different geometries on the surface of the outer tube. Triangular surfaces showed better temperature output than other geometries. The temperature difference between the inlet and outlet of the fluid in the heat exchanger with a dimple and a triangular rib with a dimple depth of 5 mm has increased by 6.5%. The highest pressure drop is related to the heat exchanger with a dimple and a triangular tooth with a dimple depth of 5 mm, the value of which is 10.9 kPa. Different values of the local Nusselt number in the annular region of the heat exchanger have been calculated for different depths. The simple heat exchanger has the highest average Nusselt number in the studied range, and the average Nusselt number for this type of heat exchanger is 57.15. |
| format | Article |
| id | doaj-art-55ce276f32284ad882052518c9826152 |
| institution | Kabale University |
| issn | 2008-4854 2783-2538 |
| language | fas |
| publishDate | 2024-04-01 |
| publisher | Semnan University |
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| series | مجله مدل سازی در مهندسی |
| spelling | doaj-art-55ce276f32284ad882052518c98261522025-01-15T08:14:58ZfasSemnan Universityمجله مدل سازی در مهندسی2008-48542783-25382024-04-01227616717510.22075/jme.2023.30329.24338085Numerical Study on the Effects of Extended Surfaces on the Performance of a Coaxial Geothermal Heat ExchangerNaser Bakhshi0Saman Rashidi1Roohollah Rafee2MSc Student, Department of Energy, Faculty of New Sciences and Technologies, Semnan University, Semnan, IranAssistant Professor, Department of Energy, Faculty of New Sciences and Technologies, Semnan University, Semnan, IranAssociate Professor, Faculty of Mechanical Engineering, Semnan University, Semnan, IranIn this study, the effect of expanded surfaces on the performance of a vertical coaxial geothermal heat exchanger has been investigated. The fluid (water) with an initial temperature of 3.5 ºC and a volumetric flow rate of 0.0008 m3/s enters from the annular area and exits from the middle pipe. The simulation is done for the heat absorption mode. The SST k-ω turbulence model is used for simulation of the turbulent flow. The thermal performance of the heat exchanger has been improved by placing ribs and dimples with several different geometries on the surface of the outer tube. Triangular surfaces showed better temperature output than other geometries. The temperature difference between the inlet and outlet of the fluid in the heat exchanger with a dimple and a triangular rib with a dimple depth of 5 mm has increased by 6.5%. The highest pressure drop is related to the heat exchanger with a dimple and a triangular tooth with a dimple depth of 5 mm, the value of which is 10.9 kPa. Different values of the local Nusselt number in the annular region of the heat exchanger have been calculated for different depths. The simple heat exchanger has the highest average Nusselt number in the studied range, and the average Nusselt number for this type of heat exchanger is 57.15.https://modelling.semnan.ac.ir/article_8085_6e3d257c1d27beb00ac3e5a4b00af3ff.pdfgeothermal heat exchangerconvective heat transfernumerical solutionextended surfacespressure drop |
| spellingShingle | Naser Bakhshi Saman Rashidi Roohollah Rafee Numerical Study on the Effects of Extended Surfaces on the Performance of a Coaxial Geothermal Heat Exchanger مجله مدل سازی در مهندسی geothermal heat exchanger convective heat transfer numerical solution extended surfaces pressure drop |
| title | Numerical Study on the Effects of Extended Surfaces on the Performance of a Coaxial Geothermal Heat Exchanger |
| title_full | Numerical Study on the Effects of Extended Surfaces on the Performance of a Coaxial Geothermal Heat Exchanger |
| title_fullStr | Numerical Study on the Effects of Extended Surfaces on the Performance of a Coaxial Geothermal Heat Exchanger |
| title_full_unstemmed | Numerical Study on the Effects of Extended Surfaces on the Performance of a Coaxial Geothermal Heat Exchanger |
| title_short | Numerical Study on the Effects of Extended Surfaces on the Performance of a Coaxial Geothermal Heat Exchanger |
| title_sort | numerical study on the effects of extended surfaces on the performance of a coaxial geothermal heat exchanger |
| topic | geothermal heat exchanger convective heat transfer numerical solution extended surfaces pressure drop |
| url | https://modelling.semnan.ac.ir/article_8085_6e3d257c1d27beb00ac3e5a4b00af3ff.pdf |
| work_keys_str_mv | AT naserbakhshi numericalstudyontheeffectsofextendedsurfacesontheperformanceofacoaxialgeothermalheatexchanger AT samanrashidi numericalstudyontheeffectsofextendedsurfacesontheperformanceofacoaxialgeothermalheatexchanger AT roohollahrafee numericalstudyontheeffectsofextendedsurfacesontheperformanceofacoaxialgeothermalheatexchanger |