Thermal-insulation performance of low density polyethylene (LDPE) foams: Comparison between two radiation thermal conductivity models
The loss of energy especially in industrial and residential buildings is one of the main reasons of increased energy consumption. Improving the thermal insulation properties of materials is a fundamental method for reducing the energy losses. Polymeric foams are introduced as materials with excellen...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Iran Polymer and Petrochemical Institute
2019-01-01
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| Series: | Polyolefins Journal |
| Subjects: | |
| Online Access: | http://poj.ippi.ac.ir/article_1572_33ccb04a41f60fc3fbcd4cf3ea1f2372.pdf |
| _version_ | 1811285455484747776 |
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| author | Rezgar Hasanzadeh Taher Azdast Ali Doniavi Richard Eungkee Lee |
| author_facet | Rezgar Hasanzadeh Taher Azdast Ali Doniavi Richard Eungkee Lee |
| author_sort | Rezgar Hasanzadeh |
| collection | DOAJ |
| description | The loss of energy especially in industrial and residential buildings is one of the main reasons of increased energy consumption. Improving the thermal insulation properties of materials is a fundamental method for reducing the energy losses. Polymeric foams are introduced as materials with excellent thermal insulation properties for this purpose. In the present study, a deep theoretical investigation is performed on the overall thermal conductivity of low-density polyethylene (LDPE) foams. The thermal conductivity by radiation is predicted using two different methods. The most appropriate model is selected in comparison with experimental results. The results show that the theoretical model has an appropriate agreement with the experimental results. The effects of foam characteristics including foam density, cell size, and cell wall thickness on the overall thermal conductivity are investigated. The results indicate that by decreasing the cell size and increasing the cell wall thickness, the overall thermal conductivity is decreased significantly. Also, there is an optimum foam density in order to achieve the smallest thermal conductivity. The lowest overall thermal conductivity achieved in the studied ranges is 30 mW/mK at foam density of 37.5 kg.m-3, cell size of 100 μm, and cell wall thickness of 6 μm. |
| first_indexed | 2024-04-13T02:44:21Z |
| format | Article |
| id | doaj.art-ca3e38a143134fafaffec5ff5584c51e |
| institution | Directory Open Access Journal |
| issn | 2322-2212 2345-6868 |
| language | English |
| last_indexed | 2024-04-13T02:44:21Z |
| publishDate | 2019-01-01 |
| publisher | Iran Polymer and Petrochemical Institute |
| record_format | Article |
| series | Polyolefins Journal |
| spelling | doaj.art-ca3e38a143134fafaffec5ff5584c51e2022-12-22T03:06:05ZengIran Polymer and Petrochemical InstitutePolyolefins Journal2322-22122345-68682019-01-0161132110.22063/poj.2018.2185.11131572Thermal-insulation performance of low density polyethylene (LDPE) foams: Comparison between two radiation thermal conductivity modelsRezgar Hasanzadeh0Taher Azdast1Ali Doniavi2Richard Eungkee Lee3Department of Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, IranDepartment of Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, IranDepartment of Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, IranDr. Foam, 33 Silker Street, Vaughan L6A4T4, Ontario, CanadaThe loss of energy especially in industrial and residential buildings is one of the main reasons of increased energy consumption. Improving the thermal insulation properties of materials is a fundamental method for reducing the energy losses. Polymeric foams are introduced as materials with excellent thermal insulation properties for this purpose. In the present study, a deep theoretical investigation is performed on the overall thermal conductivity of low-density polyethylene (LDPE) foams. The thermal conductivity by radiation is predicted using two different methods. The most appropriate model is selected in comparison with experimental results. The results show that the theoretical model has an appropriate agreement with the experimental results. The effects of foam characteristics including foam density, cell size, and cell wall thickness on the overall thermal conductivity are investigated. The results indicate that by decreasing the cell size and increasing the cell wall thickness, the overall thermal conductivity is decreased significantly. Also, there is an optimum foam density in order to achieve the smallest thermal conductivity. The lowest overall thermal conductivity achieved in the studied ranges is 30 mW/mK at foam density of 37.5 kg.m-3, cell size of 100 μm, and cell wall thickness of 6 μm.http://poj.ippi.ac.ir/article_1572_33ccb04a41f60fc3fbcd4cf3ea1f2372.pdfLDPERadiated thermal conductivityThermal-insulationPolymeric foams |
| spellingShingle | Rezgar Hasanzadeh Taher Azdast Ali Doniavi Richard Eungkee Lee Thermal-insulation performance of low density polyethylene (LDPE) foams: Comparison between two radiation thermal conductivity models Polyolefins Journal LDPE Radiated thermal conductivity Thermal-insulation Polymeric foams |
| title | Thermal-insulation performance of low density polyethylene (LDPE) foams: Comparison between two radiation thermal conductivity models |
| title_full | Thermal-insulation performance of low density polyethylene (LDPE) foams: Comparison between two radiation thermal conductivity models |
| title_fullStr | Thermal-insulation performance of low density polyethylene (LDPE) foams: Comparison between two radiation thermal conductivity models |
| title_full_unstemmed | Thermal-insulation performance of low density polyethylene (LDPE) foams: Comparison between two radiation thermal conductivity models |
| title_short | Thermal-insulation performance of low density polyethylene (LDPE) foams: Comparison between two radiation thermal conductivity models |
| title_sort | thermal insulation performance of low density polyethylene ldpe foams comparison between two radiation thermal conductivity models |
| topic | LDPE Radiated thermal conductivity Thermal-insulation Polymeric foams |
| url | http://poj.ippi.ac.ir/article_1572_33ccb04a41f60fc3fbcd4cf3ea1f2372.pdf |
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