首页|Thermal performances and invisible thermal barrier formation mechanism of arc-shaped metal-fin-enhanced thermally activated building envelopes with directional heat charging feature
Thermal performances and invisible thermal barrier formation mechanism of arc-shaped metal-fin-enhanced thermally activated building envelopes with directional heat charging feature
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Thermally activated building envelopes(TABEs)are multifunctional component that combines structural and energy properties.Based on re-examining the heat charging processes,an arc-shaped metal-fin-enhanced TABE(Arc-finTABE)with directional heat charging features is proposed to optimize the thermal barrier formation process.A comprehensive parameterized analysis is conducted based on a validated mathematical model to explore the influence of 5 fin-structure design parameters and the static insulation thickness.Results verified that the directional charging strengthening fins can improve transient thermal performances of Arc-finATBE and enlarge horizontal and vertical sizes of the thermal energy accumulation area surrounding the pipeline,while the maximum growth in extra heat loss is less than 3.17％.From the perspective of promoting heat injection into expected areas,the straight main fin configurations with the angle of main fins of 30°,shank length ratio of 0.4 and no leftward mounted fins are preferred in load-reduction mode,while the angle of main fins of 150°,shank length ratio of 0.8 and multiple fin designs,especially with one of the main fins horizontally toward the indoor side,are more favorable in auxiliary-heating mode.Besides,it is recommended to add one arc-shaped branch fin to each main fin to achieve a balance between performance improvement and material usage.Moreover,branch fins with larger arc angles are preferred in auxiliary-heating mode,while smaller arc angles are conducive to injecting heat into the wall along main fins in load-reduction mode and preventing the heat near the inner surface from being extracted.Under the direct influence of the strengthened invisible thermal barrier,Arc-finTABEs can reduce the amount of static insulation layer by 20％-80％while achieving equivalent thermal performances as conventional high-performance walls.
thermo-activated building envelopethermal barrier formationperformance enhancementarc-shaped metal finsfin parametersCFD model
Yang Yang、Sarula Chen、Jiqiang Zhang、Zhenya Zhang、Shuying Li、Kunyu Chen、Xiuyi Xiao
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College of Architecture and Art,Hefei University of Technology,Hefei 230601,China
Anhui Province Key Laboratory of Intelligent Building & Building Energy Saving,Anhui Jianzhu University,Hefei 230601,China
School of Architecture and Urban Planning,Anhui Jianzhu University,Hefei 230601,China
College of City Construction,Jiangxi Normal University,Nanchang 330022,China
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NSTL
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