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

Namhyuck Ahn and Sanghoon Park
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Namhyuck Ahn: LG Hausys, Science Park, Seoul 07796, Korea
Sanghoon Park: Division of Architecture, College of Engineering, Sun Moon University, Chungnam 31460, Korea

Energies, 2020, vol. 13, issue 22, 1-15

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.

Keywords: timber windows; hybrid timber windows; wood physics; wood anatomy; thermal conductivity; heat transmittance; condensation resistance; hygrothermal performance; heat transfer analysis (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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