Thermal response of energy foundations installed in unsaturated residual soils
This study focuses on the thermal response of energy foundations with different piping geometries installed in unsaturated soil. Energy foundations are an efficient alternative to traditional space heating and cooling approaches and can reduce energy demand for air conditioning in Brazil, where unsa...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2020-01-01
|
| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/65/e3sconf_icegt2020_05021.pdf |
| _version_ | 1819182442969300992 |
|---|---|
| author | Reiter Michael B. Morais Thaise da S. O. Tsuha Cristina de H.C. Baser Tugce |
| author_facet | Reiter Michael B. Morais Thaise da S. O. Tsuha Cristina de H.C. Baser Tugce |
| author_sort | Reiter Michael B. |
| collection | DOAJ |
| description | This study focuses on the thermal response of energy foundations with different piping geometries installed in unsaturated soil. Energy foundations are an efficient alternative to traditional space heating and cooling approaches and can reduce energy demand for air conditioning in Brazil, where unsaturated residual soil deposits are abundant. A three-dimensional numerical model for heat transfer and subsurface flow is first validated against field data from a thermal response test at the University of São Paulo. The model is then used to compare the performance of triple and quadruple U-tube piping geometries and helical piping geometries of equivalent length. The helical geometries resulted in initial less uniformly heated foundations and lower heat flux at the foundation boundary compared with the U-tubes, but the differences between the U-tube geometries and their equivalent length helices were less than 1°C. All piping geometries exhibited increased heat output as the length of heat exchanger piping increased. The infinite line source solution was compared with the model results. The infinite line source solution underestimated the thermal response of the system during the first 25-30 days and overestimated it afterwards. |
| first_indexed | 2024-12-22T22:46:12Z |
| format | Article |
| id | doaj.art-cb947fbe47cb4e53a814489455f63dee |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-12-22T22:46:12Z |
| publishDate | 2020-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-cb947fbe47cb4e53a814489455f63dee2022-12-21T18:10:06ZengEDP SciencesE3S Web of Conferences2267-12422020-01-012050502110.1051/e3sconf/202020505021e3sconf_icegt2020_05021Thermal response of energy foundations installed in unsaturated residual soilsReiter Michael B.0Morais Thaise da S. O.1Tsuha Cristina de H.C.2Baser Tugce3University of Illinois at Urbana Champaign, Department of Civil and Environmental EngineeringUniversity of São Paulo at São Carlos, Department of Geotechnical EngineeringUniversity of São Paulo at São Carlos, Department of Geotechnical EngineeringUniversity of Illinois at Urbana Champaign, Department of Civil and Environmental EngineeringThis study focuses on the thermal response of energy foundations with different piping geometries installed in unsaturated soil. Energy foundations are an efficient alternative to traditional space heating and cooling approaches and can reduce energy demand for air conditioning in Brazil, where unsaturated residual soil deposits are abundant. A three-dimensional numerical model for heat transfer and subsurface flow is first validated against field data from a thermal response test at the University of São Paulo. The model is then used to compare the performance of triple and quadruple U-tube piping geometries and helical piping geometries of equivalent length. The helical geometries resulted in initial less uniformly heated foundations and lower heat flux at the foundation boundary compared with the U-tubes, but the differences between the U-tube geometries and their equivalent length helices were less than 1°C. All piping geometries exhibited increased heat output as the length of heat exchanger piping increased. The infinite line source solution was compared with the model results. The infinite line source solution underestimated the thermal response of the system during the first 25-30 days and overestimated it afterwards.https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/65/e3sconf_icegt2020_05021.pdf |
| spellingShingle | Reiter Michael B. Morais Thaise da S. O. Tsuha Cristina de H.C. Baser Tugce Thermal response of energy foundations installed in unsaturated residual soils E3S Web of Conferences |
| title | Thermal response of energy foundations installed in unsaturated residual soils |
| title_full | Thermal response of energy foundations installed in unsaturated residual soils |
| title_fullStr | Thermal response of energy foundations installed in unsaturated residual soils |
| title_full_unstemmed | Thermal response of energy foundations installed in unsaturated residual soils |
| title_short | Thermal response of energy foundations installed in unsaturated residual soils |
| title_sort | thermal response of energy foundations installed in unsaturated residual soils |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/65/e3sconf_icegt2020_05021.pdf |
| work_keys_str_mv | AT reitermichaelb thermalresponseofenergyfoundationsinstalledinunsaturatedresidualsoils AT moraisthaisedaso thermalresponseofenergyfoundationsinstalledinunsaturatedresidualsoils AT tsuhacristinadehc thermalresponseofenergyfoundationsinstalledinunsaturatedresidualsoils AT basertugce thermalresponseofenergyfoundationsinstalledinunsaturatedresidualsoils |