Structural behavior of the PV–ETFE cushion roof

Hu, Jianhui; Chen, Wujun; Cai, Qiyao; Gao, Chengjun; Zhao, Bing; Qiu, Zhenyu; Qu, Yegao

doi:10.1016/j.tws.2015.12.024

Cited by 25 publications

(11 citation statements)

References 18 publications

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“…The mechanical durability is crucial to the AR films of solar panels because of the harsh outdoor environment. Due to the low elastic modulus of ETFE (1.2 GPa at 25 °C), mechanical durability would be a fatal issue especially with textured surface . Pencil scratch tests on four different structures were carried out with the tester hardness of 6B, and the weight of 500 g. The pencil track is in the horizontal direction during all tests, as illustrated by the arrows in Figure a1–d1.…”

Section: Resultsmentioning

confidence: 99%

Scalable Production of Mechanically Robust Antireflection Film for Omnidirectional Enhanced Flexible Thin Film Solar Cells

Wang

Yin

et al. 2017

Advanced Science

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Antireflection (AR) at the interface between the air and incident window material is paramount to boost the performance of photovoltaic devices. 3D nanostructures have attracted tremendous interest to reduce reflection, while the structure is vulnerable to the harsh outdoor environment. Thus the AR film with improved mechanical property is desirable in an industrial application. Herein, a scalable production of flexible AR films is proposed with microsized structures by roll‐to‐roll imprinting process, which possesses hydrophobic property and much improved robustness. The AR films can be potentially used for a wide range of photovoltaic devices whether based on rigid or flexible substrates. As a demonstration, the AR films are integrated with commercial Si‐based triple‐junction thin film solar cells. The AR film works as an effective tool to control the light travel path and utilize the light inward more efficiently by exciting hybrid optical modes, which results in a broadband and omnidirectional enhanced performance.

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Section: Resultsmentioning

confidence: 99%

Scalable Production of Mechanically Robust Antireflection Film for Omnidirectional Enhanced Flexible Thin Film Solar Cells

Wang

Yin

et al. 2017

Advanced Science

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“…Additional studies which include ETFE combined with PVs have been presented by Hu et al [26], Hu et al [27], Lenzmann et al [28] as well as in the frame of the ETFE-MFM project [73]. In Fig.…”

Section: Combination Of Etfe With Pv or Pvtmentioning

confidence: 99%

“…compare ETFE with glass [15,18], 2) present issues about the acoustics of ETFE structures [19,20], 3) examine shading and thermal comfort of ETFE structures [21,22], 4) discuss issues about the inspection of ETFE foils [23]. In terms of ETFE applications, several studies have been presented, including multiple applications such as ETFE façades [24], ETFE roofs [14], ETFE atria [25] as well as configurations which combine ETFE with PV (photovoltaic) technology [26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Ethylene tetrafluoroethylene (ETFE) material: Critical issues and applications with emphasis on buildings

Lamnatou

Moreno

Chemisana

et al. 2018

Renewable and Sustainable Energy Reviews

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The present article is a critical review about ETFE (ethylene tetrafluoroethylene) material, with emphasis on building applications since ETFE is promising for the building sector, offering multiple advantages (elastic and low-weight structures, etc.) from different points of view. Selected references about ETFE properties are presented, revealing that ETFE material presents resistance to temperature/aging, mechanical strength and chemical resistance. In addition, studies about light transmission/insulation of ETFE material for building applications are included, showing that ETFE cushion insulating characteristics can be further improved by utilizing additional layers while some studies refer to ETFE decay in terms of light and solar transmittance performances after some months of exposure. Investigations which compare ETFE with glass are also presented, revealing that ETFE offers many advantages, in comparison with glass, from different points of view. A separate part of the article is about ETFE environmental profile and the literature review demonstrates that most of the investigations (which include LCA (life cycle assessment)/environmental issues about ETFE) evaluate embodied energy (the findings show values from 26.5 to 210 MJ/kg). Concerning 2 ETFE applications, the literature review reveals that ETFE can be used for different applications (roofs, façades, atria, in combination with PV (photovoltaic) technology, etc.). Moreover, additional issues (acoustics, shading, etc.) are presented and critically discussed. Furthermore, a separate part with case studies is included. In this way, the present article offers useful information about ETFE, based on different factors, focusing on ETFE applications for buildings and constructions.

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“…The main principle of the first method is to add micro/nano materials to modify the epoxy resin material to reduce the linear thermal expansion coefficient and minimise interfacial stress [13,14]. The main principle of the second method is to add an elastic cushion layer with a relatively low elastic modulus between the two materials to form a 'sandwich' structure, which decreases the stress to a certain extent [15,16]. The properties of epoxy resin materials are highly complex and their various dynamic parameters are inter-dependent [17].…”

Section: Introductionmentioning

confidence: 99%

Cracking risk analysis and control for high‐voltage dry‐type valve‐side bushings

Chen

Liu

Shao

et al. 2020

IET gener. transm. distrib.

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The temperature gradient and mismatching between the thermal expansion of the core and flange readily lead to cracks and discharges on the core surface of the dry-type valve-side bushing, which severely impact the safety of power systems. It is vital to clarify the cracking risk of bushing cores under temperature gradients and establish corresponding control methods. The mechanical properties of epoxy resin impregnated paper (ERIP) material were measured in this study at different temperatures, and a thermal-mechanical coupling simulation model was established. The thermal and stress distributions of the core were obtained and the cracking risk was defined accordingly. The crack development mode was explored as it relates to the phase-field mode. Various elastic cushion materials affecting the stress distribution of the core were investigated. The results show that the mechanical properties of the ERIP material decrease rapidly as the temperature increases. When under severe working conditions, the maximum first principal stress of the core may be significantly higher than the tensile strength of the ERIP material resulting in significant axial cracks. Adding an elastic cushion layer made of polyurethane rubber can effectively relax the interface stress and reduce the cracking risk.

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Structural behavior of the PV–ETFE cushion roof

Cited by 25 publications

References 18 publications

Scalable Production of Mechanically Robust Antireflection Film for Omnidirectional Enhanced Flexible Thin Film Solar Cells

Scalable Production of Mechanically Robust Antireflection Film for Omnidirectional Enhanced Flexible Thin Film Solar Cells

Ethylene tetrafluoroethylene (ETFE) material: Critical issues and applications with emphasis on buildings

Cracking risk analysis and control for high‐voltage dry‐type valve‐side bushings

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