Dynamic and Static Investigation of Ground Heat Exchangers Equipped with Internal and External Fins
Using fins on the inner and outer surfaces of pipes is one method to improve the heat transfer rate of ground heat exchangers (GHEs), thereby reducing the borehole depth and construction and operation costs. Results of 3D numerical studies of simple and finned U-tubes with outer and inner fins are e...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-12-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/23/8689 |
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| author | Atefeh Maleki Zanjani Kobra Gharali Armughan Al-Haq Jatin Nathwani |
| author_facet | Atefeh Maleki Zanjani Kobra Gharali Armughan Al-Haq Jatin Nathwani |
| author_sort | Atefeh Maleki Zanjani |
| collection | DOAJ |
| description | Using fins on the inner and outer surfaces of pipes is one method to improve the heat transfer rate of ground heat exchangers (GHEs), thereby reducing the borehole depth and construction and operation costs. Results of 3D numerical studies of simple and finned U-tubes with outer and inner fins are evaluated for GHEs under similar physical conditions. Dynamic and static simulations show the effects of longitudinal fins on the thermal performance of borehole heat exchangers (BHEs) and heat transfer rate between circulating fluid and soil around pipes, while the dynamic tests include short timescale and frequency response tests. The results indicate that the maximum fluid temperature change is about 2.9% in the external finned pipe and 11.3% in the internal finned pipe compared to the finless pipe. The effects of the inlet velocity on temperature profiles, the patterns of the velocity and temperature contours due to the borehole curvature and the response times of the systems under various frequencies are also investigated in detail. |
| first_indexed | 2024-03-10T14:19:59Z |
| format | Article |
| id | doaj.art-f99a0112d22f40b997143fa2ce5ef886 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T14:19:59Z |
| publishDate | 2020-12-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-f99a0112d22f40b997143fa2ce5ef8862023-11-20T23:31:22ZengMDPI AGApplied Sciences2076-34172020-12-011023868910.3390/app10238689Dynamic and Static Investigation of Ground Heat Exchangers Equipped with Internal and External FinsAtefeh Maleki Zanjani0Kobra Gharali1Armughan Al-Haq2Jatin Nathwani3School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 11155-4563, IranSchool of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 11155-4563, IranWaterloo Institute for Sustainable Energy (WISE), University of Waterloo, Waterloo, ON N2L 3G1, CanadaWaterloo Institute for Sustainable Energy (WISE), University of Waterloo, Waterloo, ON N2L 3G1, CanadaUsing fins on the inner and outer surfaces of pipes is one method to improve the heat transfer rate of ground heat exchangers (GHEs), thereby reducing the borehole depth and construction and operation costs. Results of 3D numerical studies of simple and finned U-tubes with outer and inner fins are evaluated for GHEs under similar physical conditions. Dynamic and static simulations show the effects of longitudinal fins on the thermal performance of borehole heat exchangers (BHEs) and heat transfer rate between circulating fluid and soil around pipes, while the dynamic tests include short timescale and frequency response tests. The results indicate that the maximum fluid temperature change is about 2.9% in the external finned pipe and 11.3% in the internal finned pipe compared to the finless pipe. The effects of the inlet velocity on temperature profiles, the patterns of the velocity and temperature contours due to the borehole curvature and the response times of the systems under various frequencies are also investigated in detail.https://www.mdpi.com/2076-3417/10/23/8689ground heat exchanger3D simulationfinned U-tubeexternal fininternal findynamic simulation |
| spellingShingle | Atefeh Maleki Zanjani Kobra Gharali Armughan Al-Haq Jatin Nathwani Dynamic and Static Investigation of Ground Heat Exchangers Equipped with Internal and External Fins Applied Sciences ground heat exchanger 3D simulation finned U-tube external fin internal fin dynamic simulation |
| title | Dynamic and Static Investigation of Ground Heat Exchangers Equipped with Internal and External Fins |
| title_full | Dynamic and Static Investigation of Ground Heat Exchangers Equipped with Internal and External Fins |
| title_fullStr | Dynamic and Static Investigation of Ground Heat Exchangers Equipped with Internal and External Fins |
| title_full_unstemmed | Dynamic and Static Investigation of Ground Heat Exchangers Equipped with Internal and External Fins |
| title_short | Dynamic and Static Investigation of Ground Heat Exchangers Equipped with Internal and External Fins |
| title_sort | dynamic and static investigation of ground heat exchangers equipped with internal and external fins |
| topic | ground heat exchanger 3D simulation finned U-tube external fin internal fin dynamic simulation |
| url | https://www.mdpi.com/2076-3417/10/23/8689 |
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