Solar PV vacuum glazing (SVG) insulated building facades: Thermal and electrical performances

被引:3
|
作者
Zhou, Hao [1 ]
Yang, Hongxing [1 ]
Peng, Jinqing [2 ]
机构
[1] Hong Kong Polytech Univ, Dept Bldg Environm & Energy Engn, Renewable Energy Res Grp RERG, Hong Kong, Peoples R China
[2] Hunan Univ, Coll Civil Engn, Changsha 410082, Peoples R China
关键词
Building-integrated photovoltaic (BIPV); facades; Insulation layers; Thermal transmittance (U value); Secondary heat transfer factor (SHTF); Parametric analysis; Vacuum glazing; ENERGY PERFORMANCE; HEAT-TRANSFER; GLASS UNITS; LIFE-CYCLE; PHOTOVOLTAICS; WINDOW; BIPV; INTEGRATION; SYSTEM; SIMULATION;
D O I
10.1016/j.apenergy.2024.124323
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
As fire emergencies and energy saving demand of buildings have grown around the globe, concerns have been raised about the flammability of conventional external insulation materials in cold weather areas. In this paper, solar PV vacuum glazing (SVG) was proposed as a promising alternative to traditional external insulation layers of buildings due to its incombustible nature and superior thermal insulation performance. To assess the thermal and electrical performances of SVG-insulated facades, a heat transfer model and an effective absorptance calculation model for SVG-insulated fa & ccedil;ades were developed and validated against experimental data. Results showed that SVG-insulated facades exhibited significantly lower U values, ranging from 44.1% to 47.5% less than those of traditional concrete walls (without insulation layer). Additionally, the application of Low-emissivity (Low-e) coatings on the glazing could further reduce the U value from 2.05 W/(m2 center dot K) 2 center dot K) to 0.647 W/(m2 center dot K), 2 center dot K), making SVG-insulated facades competitive with traditional insulation walls. The secondary heat transfer factor (SHTF), defined as the ratio of indoor heat gain from solar radiation absorbed by building facades to incident solar radiation, was also reported for SVG-insulated facades with different solar cells (C-si, A-si, and CdTe), along with their respective efficiencies. Parametric analyses of eight parameters subsequently highlighted that their influence on the thermal performance of SVG-insulated fa & ccedil;ades was much greater than on the solar cell efficiency. Furthermore, considering the combined effect of optimal value of key influencing parameters, the lowest U value of 0.153 W/(m2 center dot K) 2 center dot K) could be achieved, which represents approximately 24.6% of the U value of traditional insulation walls. This study provides compelling evidence for the adoption of SVG-insulated facades as replacements for traditional insulation walls and offers insights into optimizing their thermal performance.
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页数:18
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