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The influence of exterior surface solar absorptivity on thermal characteristics and optimum insulation thickness

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  • Ozel, Meral

Abstract

In this study, the influence of exterior surface solar absorptivity on the thermal characteristics and optimum insulation thickness is investigated under dynamic thermal conditions. Numerical model based on an implicit finite difference method under steady periodic conditions is used to determine thermal characteristics such as yearly cooling and heating transmission loads, yearly averaged time lag and decrement factor. Later, these loads are used as inputs to an economic model for the determination of the optimum insulation thickness. The investigation is carried out for a south-facing wall in the climatic conditions of Elazığ, Turkey. Solar absorptance of external surface is assumed to be varying from 0 to 1 with an increment of 0.2. Extruded polystyrene as insulation material is selected. As the absorptance increases, heating and total transmission loads decrease while cooling transmission load increase. It is seen that the increase rate in the cooling load ranges from 66.26% to 331.28% while reduction rates in the heating and total loads range from 6.72% to 33.65% and from 2.57% to 12.90%, respectively. The results show that for uninsulated and insulated walls, solar absorptivity has a great effect on the yearly transmission loads while it has a small effect on the yearly averaged time lag. On the other hand, decrement factor is almost unaffected by solar absorptance. The results also show that solar absorptivity has a very small effect on the optimum insulation thickness and payback period, but a more significant effect on energy savings.

Suggested Citation

  • Ozel, Meral, 2012. "The influence of exterior surface solar absorptivity on thermal characteristics and optimum insulation thickness," Renewable Energy, Elsevier, vol. 39(1), pages 347-355.
    • Handle: RePEc:eee:renene:v:39:y:2012:i:1:p:347-355
    DOI: 10.1016/j.renene.2011.08.039
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    References listed on IDEAS

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    Cited by:

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    3. Jung Ho Kim & Young Il Kim, 2021. "Optimal Combination of External Wall Insulation Thickness and Surface Solar Reflectivity of Non-Residential Buildings in the Korean Peninsula," Sustainability, MDPI, vol. 13(6), pages 1-24, March.
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    5. Daouas, Naouel, 2016. "Impact of external longwave radiation on optimum insulation thickness in Tunisian building roofs based on a dynamic analytical model," Applied Energy, Elsevier, vol. 177(C), pages 136-148.
    6. Zingre, Kishor T. & Wan, Man Pun & Wong, Swee Khian & Toh, Winston Boo Thian & Lee, Irene Yen Leng, 2015. "Modelling of cool roof performance for double-skin roofs in tropical climate," Energy, Elsevier, vol. 82(C), pages 813-826.
    7. Kontoleon, Karolos J. & Saboor, Shaik & Mazzeo, Domenico & Ahmad, Jawad & Cuce, Erdem, 2023. "Thermal sensitivity and potential cooling-related energy saving of masonry walls through the lens of solar heat-rejecting paints at varying orientations," Applied Energy, Elsevier, vol. 329(C).
    8. Mazzeo, D. & Oliveti, G. & Arcuri, N., 2016. "Influence of internal and external boundary conditions on the decrement factor and time lag heat flux of building walls in steady periodic regime," Applied Energy, Elsevier, vol. 164(C), pages 509-531.
    9. Zingre, Kishor T. & Wan, Man Pun & Tong, Shanshan & Li, Hua & Chang, Victor W.-C. & Wong, Swee Khian & Thian Toh, Winston Boo & Leng Lee, Irene Yen, 2015. "Modeling of cool roof heat transfer in tropical climate," Renewable Energy, Elsevier, vol. 75(C), pages 210-223.
    10. Luis M. López-Ochoa & Jesús Las-Heras-Casas & Luis M. López-González & César García-Lozano, 2020. "Energy Renovation of Residential Buildings in Cold Mediterranean Zones Using Optimized Thermal Envelope Insulation Thicknesses: The Case of Spain," Sustainability, MDPI, vol. 12(6), pages 1-34, March.
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