Journal
SOLAR ENERGY
Volume 174, Issue -, Pages 386-398Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.solener.2018.09.004
Keywords
Hybrid photovoltaic-thermal; Pvt; Emissivity
Categories
Funding
- Engineering And Physical Science Research Council (EPSRC) grant High Temperature, High Efficiency PV-Thermal Solar System [EP/M025012/1]
- Engineering And Physical Science Research Council (EPSRC) grant Joint UK-India Clean Energy Centre (JUICE) [EP/P003605/1]
- European Commission through Marie Sklodowska Curie International Fellowship [DLV-657359]
- EPSRC [EP/M025012/1] Funding Source: UKRI
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For hybrid photovoltaic-thermal collectors to become competitive with other types of solar energy converters, they must offer high performance at fluid outlet temperatures above 60 degrees C, as is required for space heating and domestic hot water provision, which together account for nearly 50% of heat demand. A roadmap is presented of the technological advances required to achieve this goal. Strategies for reducing convective, radiative and electrical losses at elevated temperature are discussed, and an experimental characterisation of a novel transparent low-emissivity coating for photovoltaic solar cells is presented. An experimentally-validated simulation formalism is used to project the performance of different combinations of loss-reduction strategies implemented together. Finally, a techno-economic analysis is performed to predict the price points at which the hybrid technologies along the roadmap become competitive with non-hybrid photovoltaic and solar thermal technologies. The most advanced hybrid technology along the roadmap employs an evacuated cavity, a transparent low-emissivity coating, and silicon heterojunction photovoltaic cells.
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