Influence of Temperature and Moisture Content on Thermal Performance of Green Roof Media
The influence of moisture content on substrate thermal conductivity at different temperatures was investigated for four different commercially available substrates for green roofs. In the unfrozen state, as moisture content increased, thermal conductivity increased linearly. In the phase transition...
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| Format: | Article |
| Language: | English |
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MDPI AG
2021-04-01
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| Series: | Energies |
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| Online Access: | https://www.mdpi.com/1996-1073/14/9/2421 |
| _version_ | 1797536524910198784 |
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| author | Bohan Shao Caterina Valeo Phalguni Mukhopadhyaya Jianxun He |
| author_facet | Bohan Shao Caterina Valeo Phalguni Mukhopadhyaya Jianxun He |
| author_sort | Bohan Shao |
| collection | DOAJ |
| description | The influence of moisture content on substrate thermal conductivity at different temperatures was investigated for four different commercially available substrates for green roofs. In the unfrozen state, as moisture content increased, thermal conductivity increased linearly. In the phase transition zone between +5 and −10 °C, as temperature decreased, thermal conductivity increased sharply during the transition from water to ice. When the substrate was frozen, thermal conductivity varied exponentially with substrate moisture content prior to freezing. Power functions were found between thermal conductivity and temperature. Two equally sized, green roof test cells were constructed and tested to compare various roof configurations including a bare roof, varying media thickness for a green roof, and vegetation. The results show that compared with the bare roof, there is a 75% reduction in the interior temperature’s amplitude for the green roof with 150 mm thick substrate. When a sedum mat was added, there was a 20% reduction in the amplitude of the inner temperature as compared with the cell without a sedum mat. |
| first_indexed | 2024-03-10T12:01:57Z |
| format | Article |
| id | doaj.art-82dd6c365d7f46509db8d9eb41a4d33e |
| institution | Directory Open Access Journal |
| issn | 1996-1073 |
| language | English |
| last_indexed | 2024-03-10T12:01:57Z |
| publishDate | 2021-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Energies |
| spelling | doaj.art-82dd6c365d7f46509db8d9eb41a4d33e2023-11-21T16:54:37ZengMDPI AGEnergies1996-10732021-04-01149242110.3390/en14092421Influence of Temperature and Moisture Content on Thermal Performance of Green Roof MediaBohan Shao0Caterina Valeo1Phalguni Mukhopadhyaya2Jianxun He3Mechanical Engineering, University of Victoria, Victoria, BC V8W 2Y2, CanadaMechanical Engineering, University of Victoria, Victoria, BC V8W 2Y2, CanadaCivil Engineering, University of Victoria, Victoria, BC V8W 2Y2, CanadaCivil Engineering, Schulich School of Engineering, University of Calgary, Calgary, AB T2N 1N4, CanadaThe influence of moisture content on substrate thermal conductivity at different temperatures was investigated for four different commercially available substrates for green roofs. In the unfrozen state, as moisture content increased, thermal conductivity increased linearly. In the phase transition zone between +5 and −10 °C, as temperature decreased, thermal conductivity increased sharply during the transition from water to ice. When the substrate was frozen, thermal conductivity varied exponentially with substrate moisture content prior to freezing. Power functions were found between thermal conductivity and temperature. Two equally sized, green roof test cells were constructed and tested to compare various roof configurations including a bare roof, varying media thickness for a green roof, and vegetation. The results show that compared with the bare roof, there is a 75% reduction in the interior temperature’s amplitude for the green roof with 150 mm thick substrate. When a sedum mat was added, there was a 20% reduction in the amplitude of the inner temperature as compared with the cell without a sedum mat.https://www.mdpi.com/1996-1073/14/9/2421green roofthermal conductivitymoisture contentheat flow meterthermal performancefrozen soils |
| spellingShingle | Bohan Shao Caterina Valeo Phalguni Mukhopadhyaya Jianxun He Influence of Temperature and Moisture Content on Thermal Performance of Green Roof Media Energies green roof thermal conductivity moisture content heat flow meter thermal performance frozen soils |
| title | Influence of Temperature and Moisture Content on Thermal Performance of Green Roof Media |
| title_full | Influence of Temperature and Moisture Content on Thermal Performance of Green Roof Media |
| title_fullStr | Influence of Temperature and Moisture Content on Thermal Performance of Green Roof Media |
| title_full_unstemmed | Influence of Temperature and Moisture Content on Thermal Performance of Green Roof Media |
| title_short | Influence of Temperature and Moisture Content on Thermal Performance of Green Roof Media |
| title_sort | influence of temperature and moisture content on thermal performance of green roof media |
| topic | green roof thermal conductivity moisture content heat flow meter thermal performance frozen soils |
| url | https://www.mdpi.com/1996-1073/14/9/2421 |
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