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Switchable photovoltaic window for on-demand shading and electricity generation

Götz-Köhler, Maximilian and Banik, Udayan and Meddeb, Hosni and Neugebohrn, Nils and Berends, Dennis and Gehrke, Kai and Vehse, Martin and Agert, Carsten (2022) Switchable photovoltaic window for on-demand shading and electricity generation. Solar Energy, 232, pp. 433-443. Elsevier. doi: 10.1016/j.solener.2021.12.071. ISSN 0038-092X.

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Official URL: https://doi.org/10.1016/j.solener.2021.12.071

Abstract

A next step in the development of transparent photovoltaic windows would be to introduce a switching mechanism that allows the user to switch the window between a transparent and an opaque state as desired to generate electricity and shade the building interior. In this work, we investigate a switchable photovoltaic window consisting of the combination of a semitransparent germanium solar cell and a gasochromic switchable magnesium mirror in a double glazing. We analyze the average visible transmittance (AVT) and spectral emissivity (e) of the device in the transparent (AVT = 18%, e = 0.27) and light harvesting states (AVT = 1%, e = 0.06). The thermal and electrical performance of the switchable solar cell is studied under varied solar irradiance. The experimental results are used to model the annual electricity generation of a switchable photovoltaic window in different climate regions under different switching scenarios, based on datasets from the Photovoltaic Geographical Information System (PV-GIS). The model suggests that especially in Mediterranean regions, switchable transparent photovoltaic windows with an efficiency of 2% can be a promising step to combine on-demand shading with electricity generation. Moreover, it shows that to generate more than 20 kWh/m2 of electricity per year with this technology, the switching must be additionally coupled to the occupancy of the indoor spaces. Our model is applicable to other switchable PV technologies for evaluation purposes and to estimate ideal use cases.

Item URL in elib:https://elib.dlr.de/148281/
Document Type:Article
Title:Switchable photovoltaic window for on-demand shading and electricity generation
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Götz-Köhler, MaximilianMaximilian.Goetz (at) dlr.dehttps://orcid.org/0000-0002-6078-4359
Banik, UdayanUdayan.Banik (at) dlr.dehttps://orcid.org/0000-0003-2605-2215
Meddeb, Hosnihosni.meddeb (at) dlr.dehttps://orcid.org/0000-0001-8939-7910
Neugebohrn, NilsNils.Neugebohrn (at) dlr.dehttps://orcid.org/0000-0002-3335-7861
Berends, DennisDennis.Berends (at) dlr.dehttps://orcid.org/0000-0001-9064-0914
Gehrke, KaiKai.Gehrke (at) dlr.dehttps://orcid.org/0000-0002-0591-8289
Vehse, Martinmartin.vehse (at) dlr.dehttps://orcid.org/0000-0003-0578-6121
Agert, CarstenCarsten.Agert (at) dlr.dehttps://orcid.org/0000-0003-4733-5257
Date:15 January 2022
Journal or Publication Title:Solar Energy
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:232
DOI :10.1016/j.solener.2021.12.071
Page Range:pp. 433-443
Publisher:Elsevier
ISSN:0038-092X
Status:Published
Keywords:Switchable solar cell, PV potential, Solar windows, Semi-transparent solar cell, Smart shading, PV-GIS
HGF - Research field:Energy
HGF - Program:Energy System Design
HGF - Program Themes:Digitalization and System Technology
DLR - Research area:Energy
DLR - Program:E SY - Energy System Technology and Analysis
DLR - Research theme (Project):E - Energy System Technology
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems > Urban and Residential Technologies
Deposited By: Götz, Maximilian
Deposited On:13 Jan 2022 12:29
Last Modified:24 May 2022 23:48

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