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Heat Transfer Analysis of Timber Windows with Different Wood Species and Anatomical Direction

Author

Listed:
  • Namhyuck Ahn

    (LG Hausys, Science Park, Seoul 07796, Korea)

  • Sanghoon Park

    (Division of Architecture, College of Engineering, Sun Moon University, Chungnam 31460, Korea)

Abstract

When assessing the hygrothermal performance of timber windows, it is important to apply the unique thermal conductivity of wood by each wood species as well as an anatomical direction within the same material as they affect the performance and long-term durability of products. A series of heat transfer analyses of window frames using THERM and WINDOW along with measurements on the thermal conductivity of five hardwoods using laser flash apparatus (LFA) was performed to compare and evaluate heat transmittance (U-value) and condensation resistance (CR) of three types of timber and hybrid timber windows. For each window type, 6.1 to 10.3% of the maximum difference in the heat transmittance among cases was calculated. Besides, a linear correlation was found between the U-value and the CR for most cases; thus, the selection of wood species and anatomical direction would improve the hygrothermal performance of timber windows overall. The results also indicated that there were some cases where the overall CR of windows did not improve because the U-value of the glazing system was not sufficiently low.

Suggested Citation

  • Namhyuck Ahn & Sanghoon Park, 2020. "Heat Transfer Analysis of Timber Windows with Different Wood Species and Anatomical Direction," Energies, MDPI, vol. 13(22), pages 1-15, November.
    • Handle: RePEc:gam:jeners:v:13:y:2020:i:22:p:6050-:d:447578
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    References listed on IDEAS

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    1. Hee, W.J. & Alghoul, M.A. & Bakhtyar, B. & Elayeb, OmKalthum & Shameri, M.A. & Alrubaih, M.S. & Sopian, K., 2015. "The role of window glazing on daylighting and energy saving in buildings," Renewable and Sustainable Energy Reviews, Elsevier, vol. 42(C), pages 323-343.
    2. Mi-Su Shin & Kyu-Nam Rhee & Ji-Yong Yu & Gun-Joo Jung, 2017. "Determination of Equivalent Thermal Conductivity of Window Spacers in Consideration of Condensation Prevention and Energy Saving Performance," Energies, MDPI, vol. 10(5), pages 1-21, May.
    3. Sihyun Park & Seung-Yeong Song, 2019. "Evaluation of Alternatives for Improving the Thermal Resistance of Window Glazing Edges," Energies, MDPI, vol. 12(2), pages 1-18, January.
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