Thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels: an experimental and computational study
The purpose of this work was to quantify the thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels (PCSPs). Special interest was in cases where the use of rigid insulation (e.g. PIR) would leave air gaps between insulation boards and diagonal ties, thus intens...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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EDP Sciences
2020-01-01
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| Series: | E3S Web of Conferences |
| Online Access: | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/32/e3sconf_nsb2020_08001.pdf |
| _version_ | 1819063644247293952 |
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| author | Klõšeiko Paul Piir Reimo Jeltsov Marti Kalamees Targo |
| author_facet | Klõšeiko Paul Piir Reimo Jeltsov Marti Kalamees Targo |
| author_sort | Klõšeiko Paul |
| collection | DOAJ |
| description | The purpose of this work was to quantify the thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels (PCSPs). Special interest was in cases where the use of rigid insulation (e.g. PIR) would leave air gaps between insulation boards and diagonal ties, thus intensifying the thermal bridge. A climate chamber experiment using 5 different joint types was performed to gather reference data for CFD model validation. In the experiment, natural convection was observed in joints where no additional insulation was used, i.e. in air cavities. Significantly larger heat fluxes were measured in these cavities compared to insulated joints. The thermal bridging effect was evaluated for a typical PCSP (thermal transmittance without thermal bridges U = 0.11 W/(m²·K)) using CFD software taking into account 3D heat conduction and convection. Simulation results indicate that diagonal ties without adjacent air cavities increased the average thermal transmittance (U-value) of the envelope by 8%, diagonal ties with a 6 mm air cavity – 19...33% and diagonal ties with a 10 mm air cavity – 45...56%. In conclusion, it was found that the joints in insulation caused by diagonal ties affect the overall thermal performance of the building envelope significantly when efforts are not made to fill the air cavities around the connectors. |
| first_indexed | 2024-12-21T15:17:57Z |
| format | Article |
| id | doaj.art-c2cb0dd496084dfb8e1aaa63acb63612 |
| institution | Directory Open Access Journal |
| issn | 2267-1242 |
| language | English |
| last_indexed | 2024-12-21T15:17:57Z |
| publishDate | 2020-01-01 |
| publisher | EDP Sciences |
| record_format | Article |
| series | E3S Web of Conferences |
| spelling | doaj.art-c2cb0dd496084dfb8e1aaa63acb636122022-12-21T18:59:07ZengEDP SciencesE3S Web of Conferences2267-12422020-01-011720800110.1051/e3sconf/202017208001e3sconf_nsb2020_08001Thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels: an experimental and computational studyKlõšeiko Paul0Piir Reimo1Jeltsov Marti2Kalamees TargoTallinn University of Technology, Department of Civil Engineering and ArchitectureTallinn University of Technology, Department of Civil Engineering and ArchitectureEstflow Consulting OÜThe purpose of this work was to quantify the thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels (PCSPs). Special interest was in cases where the use of rigid insulation (e.g. PIR) would leave air gaps between insulation boards and diagonal ties, thus intensifying the thermal bridge. A climate chamber experiment using 5 different joint types was performed to gather reference data for CFD model validation. In the experiment, natural convection was observed in joints where no additional insulation was used, i.e. in air cavities. Significantly larger heat fluxes were measured in these cavities compared to insulated joints. The thermal bridging effect was evaluated for a typical PCSP (thermal transmittance without thermal bridges U = 0.11 W/(m²·K)) using CFD software taking into account 3D heat conduction and convection. Simulation results indicate that diagonal ties without adjacent air cavities increased the average thermal transmittance (U-value) of the envelope by 8%, diagonal ties with a 6 mm air cavity – 19...33% and diagonal ties with a 10 mm air cavity – 45...56%. In conclusion, it was found that the joints in insulation caused by diagonal ties affect the overall thermal performance of the building envelope significantly when efforts are not made to fill the air cavities around the connectors.https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/32/e3sconf_nsb2020_08001.pdf |
| spellingShingle | Klõšeiko Paul Piir Reimo Jeltsov Marti Kalamees Targo Thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels: an experimental and computational study E3S Web of Conferences |
| title | Thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels: an experimental and computational study |
| title_full | Thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels: an experimental and computational study |
| title_fullStr | Thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels: an experimental and computational study |
| title_full_unstemmed | Thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels: an experimental and computational study |
| title_short | Thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels: an experimental and computational study |
| title_sort | thermal bridge effect of vertical diagonal tie connectors in precast concrete sandwich panels an experimental and computational study |
| url | https://www.e3s-conferences.org/articles/e3sconf/pdf/2020/32/e3sconf_nsb2020_08001.pdf |
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