Thermal Performance of Insulated Constructions—Experimental Studies
Buildings that are designed to meet high-energy performance requirements, e.g., passive houses, require well-insulated building envelopes, with increased insulation thicknesses for roof, wall and floor structures. We investigate whether there are differences in the efficiency of thermal insulation m...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2019-02-01
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| Series: | Buildings |
| Subjects: | |
| Online Access: | https://www.mdpi.com/2075-5309/9/2/49 |
| _version_ | 1818683712302219264 |
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| author | Lars Gullbrekken Steinar Grynning Jørn Emil Gaarder |
| author_facet | Lars Gullbrekken Steinar Grynning Jørn Emil Gaarder |
| author_sort | Lars Gullbrekken |
| collection | DOAJ |
| description | Buildings that are designed to meet high-energy performance requirements, e.g., passive houses, require well-insulated building envelopes, with increased insulation thicknesses for roof, wall and floor structures. We investigate whether there are differences in the efficiency of thermal insulation materials at different moisture levels in the insulation and if there is a larger or smaller risk of natural convection in wood-fibre based insulation than in mineral wool. The work has mainly been performed by use of laboratory measurements included permeability properties and full-scale measurements of thermal transmittance of mineral wool and wood-fibre insulated constructions. In addition, calculations have been used to calculate resulting effects on the thermal performance of constructions. Results showed that the thermal conductivity was unaffected by moisture in the hygroscopic range. The air permeability was found to be approximately 50% higher for the wood-fibre insulation compared to mineral wool insulation. Measurements showed that the largest U-values and Nusselt numbers were found for the wall configuration. Calculation of the U-value of walls showed that in order to achieve the same U-value for the wood-fibre insulated wall as the mineral wool, it is necessary to add 20 mm insulation to the 250 mm wall and approximately 30 mm for the 400 mm wall. |
| first_indexed | 2024-12-17T10:39:06Z |
| format | Article |
| id | doaj.art-9465beae3a82446e9d879890d36d6a6b |
| institution | Directory Open Access Journal |
| issn | 2075-5309 |
| language | English |
| last_indexed | 2024-12-17T10:39:06Z |
| publishDate | 2019-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Buildings |
| spelling | doaj.art-9465beae3a82446e9d879890d36d6a6b2022-12-21T21:52:18ZengMDPI AGBuildings2075-53092019-02-01924910.3390/buildings9020049buildings9020049Thermal Performance of Insulated Constructions—Experimental StudiesLars Gullbrekken0Steinar Grynning1Jørn Emil Gaarder2SNTEF Building and Infrastructure, P.O. Box 4760 Torgarden, NO-7465 Trondheim, NorwaySNTEF Building and Infrastructure, P.O. Box 4760 Torgarden, NO-7465 Trondheim, NorwaySNTEF Building and Infrastructure, P.O. Box 4760 Torgarden, NO-7465 Trondheim, NorwayBuildings that are designed to meet high-energy performance requirements, e.g., passive houses, require well-insulated building envelopes, with increased insulation thicknesses for roof, wall and floor structures. We investigate whether there are differences in the efficiency of thermal insulation materials at different moisture levels in the insulation and if there is a larger or smaller risk of natural convection in wood-fibre based insulation than in mineral wool. The work has mainly been performed by use of laboratory measurements included permeability properties and full-scale measurements of thermal transmittance of mineral wool and wood-fibre insulated constructions. In addition, calculations have been used to calculate resulting effects on the thermal performance of constructions. Results showed that the thermal conductivity was unaffected by moisture in the hygroscopic range. The air permeability was found to be approximately 50% higher for the wood-fibre insulation compared to mineral wool insulation. Measurements showed that the largest U-values and Nusselt numbers were found for the wall configuration. Calculation of the U-value of walls showed that in order to achieve the same U-value for the wood-fibre insulated wall as the mineral wool, it is necessary to add 20 mm insulation to the 250 mm wall and approximately 30 mm for the 400 mm wall.https://www.mdpi.com/2075-5309/9/2/49U-valuelaboratory measurementsmineral wool insulationwood-fibre insulation |
| spellingShingle | Lars Gullbrekken Steinar Grynning Jørn Emil Gaarder Thermal Performance of Insulated Constructions—Experimental Studies Buildings U-value laboratory measurements mineral wool insulation wood-fibre insulation |
| title | Thermal Performance of Insulated Constructions—Experimental Studies |
| title_full | Thermal Performance of Insulated Constructions—Experimental Studies |
| title_fullStr | Thermal Performance of Insulated Constructions—Experimental Studies |
| title_full_unstemmed | Thermal Performance of Insulated Constructions—Experimental Studies |
| title_short | Thermal Performance of Insulated Constructions—Experimental Studies |
| title_sort | thermal performance of insulated constructions experimental studies |
| topic | U-value laboratory measurements mineral wool insulation wood-fibre insulation |
| url | https://www.mdpi.com/2075-5309/9/2/49 |
| work_keys_str_mv | AT larsgullbrekken thermalperformanceofinsulatedconstructionsexperimentalstudies AT steinargrynning thermalperformanceofinsulatedconstructionsexperimentalstudies AT jørnemilgaarder thermalperformanceofinsulatedconstructionsexperimentalstudies |