1.
F Giovannetti; M Kirchner; M Albert
Design Options for Uncovered Photovoltaic-Thermal Glass-Glass Panels Proceedings Article
In: ISES, (Hrsg.): Conference Proceedings EuroSun 2016, Palma de Mallorca, Spain, 2016.
@inproceedings{Giovannetti2016bb,
title = {Design Options for Uncovered Photovoltaic-Thermal Glass-Glass Panels},
author = {F Giovannetti and M Kirchner and M Albert},
editor = {ISES},
doi = {10.18086/eurosun.2016.08.11},
year = {2016},
date = {2016-10-14},
booktitle = {Conference Proceedings EuroSun 2016},
address = {Palma de Mallorca, Spain},
abstract = {The use of glass-glass photovoltaic modules in uncovered photovoltaic-thermal (PVT) panels can provide for a longer durability of the solar cells and for higher design flexibility compared to other encapsulating technologies, thus representing an attractive solution for building integration. After giving an overview of available design options and of their impact on the efficiency of the PVT, the paper presents and analyzes the thermal performance of different prototypes by means of measurements in open circuit (OC) mode according to ISO 9806. The customized panels are assembled from commercially available components and intended for the integration into ventilated glass façades. As cell technology, wafer-based crystalline silicon (c-Si) and thin film copper indium diselenide (CIS) are implemented. For the front cover, clear glass with high and low iron content as well as special low emissivity and colored glass with high solar transmittance developed for solar applications are considered. In combination with c-Si solar cells, we additionally compare the use of black enameled rear glass and multilayer black encapsulant as a solution to mask the heat exchanger. The results show the significant impact of the design on the thermal performance of the PVT panels: we report zero-loss efficiency values between 0.61 and 0.78 and heat loss coefficients b1.5m/s, evaluated at a wind speed of 1.5 m/s, between 10.2 and 17.8 W/m K. Concerning both performance and aesthetics, the best results are achieved with CIS photovoltaic modules and low-emissivity front glass panes.},
keywords = {},
pubstate = {published},
tppubtype = {inproceedings}
}
The use of glass-glass photovoltaic modules in uncovered photovoltaic-thermal (PVT) panels can provide for a longer durability of the solar cells and for higher design flexibility compared to other encapsulating technologies, thus representing an attractive solution for building integration. After giving an overview of available design options and of their impact on the efficiency of the PVT, the paper presents and analyzes the thermal performance of different prototypes by means of measurements in open circuit (OC) mode according to ISO 9806. The customized panels are assembled from commercially available components and intended for the integration into ventilated glass façades. As cell technology, wafer-based crystalline silicon (c-Si) and thin film copper indium diselenide (CIS) are implemented. For the front cover, clear glass with high and low iron content as well as special low emissivity and colored glass with high solar transmittance developed for solar applications are considered. In combination with c-Si solar cells, we additionally compare the use of black enameled rear glass and multilayer black encapsulant as a solution to mask the heat exchanger. The results show the significant impact of the design on the thermal performance of the PVT panels: we report zero-loss efficiency values between 0.61 and 0.78 and heat loss coefficients b1.5m/s, evaluated at a wind speed of 1.5 m/s, between 10.2 and 17.8 W/m K. Concerning both performance and aesthetics, the best results are achieved with CIS photovoltaic modules and low-emissivity front glass panes.