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BIPV-Powered Smart Windows Utilizing Photovoltaic and Electrochromic Devices
Department of Mechanical Engineering, ROC Military Academy, Kaohsiung 830, Taiwan
Institute of Materials Engineering, National Pingtung University of Science and Technology, Pingtung 912, Taiwan
* Author to whom correspondence should be addressed.
Received: 22 November 2011; in revised form: 24 December 2011 / Accepted: 29 December 2011 / Published: 30 December 2011
Abstract: A BIPV-powered smart window comprising a building-integrated photovoltaic (BIPV) panel and an all-solid-state electrochromic (EC) stack is proposed. In the proposed device, the output voltage of the BIPV panel varies in accordance with the intensity of the incident light and is modulated in such a way as to generate the EC stack voltage required to maintain the indoor illuminance within a specified range. Two different EC stacks are fabricated and characterized, namely one stack comprising ITO/WO3/Ta2O5/ITO and one stack comprising ITO/WO3/lithium-polymer electrolyte/ITO. It is shown that of the two stacks, the ITO/WO3/lithium-polymer electrolyte/ITO stack has a larger absorptance (i.e., approximately 99% at a driving voltage of 3.5 V). The experimental results show that the smart window incorporating an ITO/WO3/lithium-polymer electrolyte/ITO stack with an electrolyte thickness of 1.0 μm provides an indoor illuminance range of 750–1,500 Lux under typical summertime conditions in Taiwan.
Keywords: absorptance; BIPV; electrochromic; tungsten oxide (WO3)
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MDPI and ACS Style
Ma, R.-H.; Chen, Y.-C. BIPV-Powered Smart Windows Utilizing Photovoltaic and Electrochromic Devices. Sensors 2012, 12, 359-372.
Ma R-H, Chen Y-C. BIPV-Powered Smart Windows Utilizing Photovoltaic and Electrochromic Devices. Sensors. 2012; 12(1):359-372.
Ma, Rong-Hua; Chen, Yu-Chia. 2012. "BIPV-Powered Smart Windows Utilizing Photovoltaic and Electrochromic Devices." Sensors 12, no. 1: 359-372.