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Study on the Energy Saving Potential for Semi-Transparent PV Window in Southwest China
摘要： To study Semi-Transparent photovoltaic (STPV) windows, experiments were conducted to test the energy potential of STPV window installed in buildings. Two identical rooms were built up as experimental units; one was fitted with amorphous silicon (a-silicon) photovoltaic (PV) windows, and another was fitted with a conventional window. The interactional influence was analyzed among air conditioning energy consumption, lighting energy consumption, and energy generation. It can be concluded that STPV windows could provide 0.26 kWh/per day and save 29% on comprehensive building load on a typical sunny day. In order to further investigate, buildings installed with STPV windows in four typical cities with different climate environments in southwest China were simulated and analyzed. The cooling load of the buildings were all decreased while the heating energy consumption and lighting energy consumption were lightly increased. The energy generation of STPV windows was highest in Lhasa at 402.1 kWh/year. The energy saving potential of STPV windows was predicted with good values; 54% in Kunming.
关键词： electricity consumption,southwest China,building integrated photovoltaic (BIPV),STPV window,energy generation
更新于2025-09-19 17:15:36
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Storage systems for building-integrated photovoltaic (BIPV) and building-integrated photovoltaic/thermal (BIPVT) installations: Environmental profile and other aspects
摘要： In recent years there has been an increasing interest in Building-Integrated Photovoltaic (BIPV) and Building-Integrated Photovoltaic/Thermal (BIPVT) systems since they produce clean energy and replace conventional building envelope materials. By taking into account that storage is a key factor in the effective use of renewable energy, the present article is an overview about storage systems which are appropriate for BIPV and BIPVT applications. The literature review shows that there are multiple storage solutions, based on different kinds of materials (batteries, Phase Change Material (PCM) components, etc.). In terms of BIPV and BIPVT with batteries or PCMs or water tanks as storage systems, most of the installations are non-concentrating, fa?ade- or roof-integrated, water- or air-based (in the case of BIPVT) and include silicon-based PV cells, lead-acid or lithium-ion batteries, paraffin- or salt-based PCMs. Regarding parameters that affect the environmental profile of storage systems, in the case of batteries critical factors such as material manufacturing, accidental release of electrolytes, inhalation toxicity, flammable elements, degradation and end-of-life management play a pivotal role. Regarding PCMs, there are some materials that are corrosive and present fire-safety issues as well as high toxicity in terms of human health and ecosystems. Concerning water storage tanks, based on certain studies about tanks with volumes of 300 L and 600 L, their impacts range from 5.9 to 11.7 GJprim and from 0.3 to 1.0 t CO2.eq. Finally, it should be noted that additional storage options such as Trombe walls, pebble beds and nanotechnologies are critically discussed. The contribution of the present article to the existing literature is associated with the fact that it presents a critical review about storage devices in the case of BIPV and BIPVT applications, by placing emphasis on the environmental profile of certain storage materials.
关键词： ecotoxicity,Building-Integrated Photovoltaic/Thermal (BIPVT),embodied energy,Human toxicity,Life Cycle Assessment (LCA),CO2 emissions,Building-Integrated Photovoltaic (BIPV),Storage materials
更新于2025-09-19 17:13:59
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Thermal regulation of PV fa?ade integrated with thin-film solar cells through a naturally ventilated open air channel
摘要： Thermal regulation of photovoltaic fa?ade through passive air channel provides a cost effective measure for improving solar to electrical energy conversion efficiency. This study presents a 2D numerical investigation of the fluid flow and heat transfer characteristics of natural convection driven by buoyancy force inside the passive cooling air channel created by two vertical parallel walls. One wall is heated by absorbed heat by photovoltaic (PV) cells from solar radiation. Numerical solutions for open and closed channel are obtained for the channel of 1.05 m in height and 0.16 m in width, respectively. The natural convective cooling effect on the PV cells for different ventilation strategies were examined considering the surface temperature of PV panels. It is found that the maximum surface temperature reaches 57.1 oC for closed channel, 49.1 oC for opened channel. Opened channel behind the PV panel is an economic way of heat releasing for the benefit of PV power generation. However, other issues such as noise control and cleaning difficulty may also be encountered by fa?ade designers. At the same time, understanding the mechanisms involved in the fluid flow and heat transfer in the channel back the PV panel through examining the pressure distribution along the cavity is required and equally important for the design improvements of PV fa?ade especially for the design of the air channel entrance to lower its pressure drop.
关键词： Ventilated and closed PV facade,Building integrated photovoltaic (BIPV),Convective heat transfer
更新于2025-09-12 10:27:22
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[IEEE 2019 International Conference on System Science and Engineering (ICSSE) - Dong Hoi, Vietnam (2019.7.20-2019.7.21)] 2019 International Conference on System Science and Engineering (ICSSE) - Facade Integrated Photovoltaic Systems: Potential Applications for Commercial Building in Vietnam
摘要： In this paper, we investigate the potential applications of facade integrated photovoltaic (PV) systems for commercial buildings in Vietnam. By integrating PV systems into the facade of buildings, we can reduce the energy consumption of the building, including air conditioning and lighting systems. Our study proposes a comprehensive approach to designing suitable PV facade systems for commercial buildings in Vietnam, which includes the selection of appropriate PV panels, facade types, and inverter configurations. We also introduce essential simulation software for planning and designing facade PV systems and for simulating the overall building energy performance. The results of our study demonstrate that facade PV systems can significantly decrease the energy consumption of commercial buildings in Vietnam.
关键词： facade PV,micro inverter configuration,building-integrated photovoltaic (BIPV),facade wall
更新于2025-09-11 14:15:04