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Investigation of the thermal resistance of timber attic spaces with reflective foil and bulk insulation, heat flow up

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  • Belusko, M.
  • Bruno, F.
  • Saman, W.

Abstract

An experimental investigation was undertaken in which the thermal resistance for the heat flow through a typical timber framed pitched roofing system was measured under outdoor conditions for heat flow up. The measured thermal resistance of low resistance systems such as an uninsulated attic space and a reflective attic space compared well with published data. However, with higher thermal resistance systems containing bulk insulation within the timber frame, the measured result for a typical installation was as low as 50% of the thermal resistance determined considering two dimensional thermal bridging using the parallel path method. This result was attributed to three dimensional heat flow and insulation installation defects, resulting from the design and construction method used. Translating these results to a typical house with a 200Â m2 floor area, the overall thermal resistance of the roof was at least 23% lower than the overall calculated thermal resistance including two dimensional thermal bridging. When a continuous layer of bulk insulation was applied to the roofing system, the measured values were in agreement with calculated resistances representing a more reliable solution.

Suggested Citation

  • Belusko, M. & Bruno, F. & Saman, W., 2011. "Investigation of the thermal resistance of timber attic spaces with reflective foil and bulk insulation, heat flow up," Applied Energy, Elsevier, vol. 88(1), pages 127-137, January.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:1:p:127-137
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    References listed on IDEAS

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    2. Samuel Domínguez & Juan J. Sendra & Angel L. León & Paula M. Esquivias, 2012. "Towards Energy Demand Reduction in Social Housing Buildings: Envelope System Optimization Strategies," Energies, MDPI, vol. 5(7), pages 1-25, July.
    3. Ascione, Fabrizio & Bianco, Nicola & Rossi, Filippo de’ & Turni, Gianluca & Vanoli, Giuseppe Peter, 2012. "Different methods for the modelling of thermal bridges into energy simulation programs: Comparisons of accuracy for flat heterogeneous roofs in Italian climates," Applied Energy, Elsevier, vol. 97(C), pages 405-418.
    4. Mavromatidis, Lazaros Elias & Bykalyuk, Anna & Lequay, Hervé, 2013. "Development of polynomial regression models for composite dynamic envelopes’ thermal performance forecasting," Applied Energy, Elsevier, vol. 104(C), pages 379-391.
    5. Al-Sanea, Sami A. & Zedan, M.F., 2012. "Effect of thermal bridges on transmission loads and thermal resistance of building walls under dynamic conditions," Applied Energy, Elsevier, vol. 98(C), pages 584-593.
    6. Roberto Zanetti Freire & Gerson Henrique dos Santos & Leandro dos Santos Coelho, 2017. "Hygrothermal Dynamic and Mould Growth Risk Predictions for Concrete Tiles by Using Least Squares Support Vector Machines," Energies, MDPI, vol. 10(8), pages 1-16, July.
    7. Mavromatidis, Lazaros Elias & EL Mankibi, Mohamed & Michel, Pierre & Santamouris, Mat, 2012. "Numerical estimation of time lags and decrement factors for wall complexes including Multilayer Thermal Insulation, in two different climatic zones," Applied Energy, Elsevier, vol. 92(C), pages 480-491.

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