Efficiency limits of concentrating spectral-splitting hybrid photovoltaic-thermal (PV-T) solar collectors and systems

Gan Huang; Kai Wang; Christos N. Markides

doi:10.1038/s41377-021-00465-1

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Efficiency limits of concentrating spectral-splitting hybrid photovoltaic-thermal (PV-T) solar collectors and systems

Articles

- Efficiency limits of concentrating spectral-splitting hybrid photovoltaic-thermal (PV-T) solar collectors and systems
- Light: Science & Applications Vol. 10, Issue 2, Pages: 264-277(2021)
- Affiliations：
  
  1.Clean Energy Processes (CEP) Laboratory, Department of Chemical Engineering, Imperial College London, London SW7 2AZ, UK
  2.Institute of Refrigeration and Cryogenics, Key Laboratory of Refrigeration and Cryogenic Technology of Zhejiang Province, Zhejiang University, Hangzhou 310027, China
- Author bio：
  
  Christos N. Markides (c.markides@imperial.ac.uk)
- Funds：
- DOI：10.1038/s41377-021-00465-1
  CLC：
- Published：2021，
  
  Published Online：05 February 2021，
  
  Received：12 July 2020，
  
  Revised：06 December 2020，
  
  Accepted：05 January 2021
- Accepted：
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Huang, G., Wang, K. & Markides, C. N. Efficiency limits of concentrating spectral-splitting hybrid photovoltaic-thermal (PV-T) solar collectors and systems. Light: Science & Applications, 10, 264-277 (2021).
DOI：

Huang, G., Wang, K. & Markides, C. N. Efficiency limits of concentrating spectral-splitting hybrid photovoltaic-thermal (PV-T) solar collectors and systems. Light: Science & Applications, 10, 264-277 (2021). DOI： 10.1038/s41377-021-00465-1.

摘要

Abstract

Spectral splitting is an approach to the design of hybrid photovoltaic-thermal (PVT) collectors that promises significant performance benefits. However

the ultimate efficiency limits

optimal PV cell materials and optical filters of spectral-splitting PVT (SSPVT) collectors remain unclear

with a lack of consensus in the literature. We develop an idealized model of SSPVT collectors and use this to determine their electrical and thermal efficiency limits

and to uncover how these limits can be approached through the selection of optimal PV cell materials and spectral-splitting filters. Assuming that thermal losses can be minimized

the efficiency limit

optimal PV material and optimal filter all depend strongly on a coefficient

which quantifies the value of the delivered thermal energy relative to that of the generated electricity. The total (electrical plus thermal) efficiency limit of SSPVT collectors increases at higher

and at higher optical concentrations. The optimal spectral-splitting filter is defined by sharp lower- and upper-bound energies; the former always coincides with the bandgap of the cell

whereas the latter decreases at higher

. The total effective efficiency limit of SSPVT collectors is over 20% higher than those of either standalone PV modules or standalone ST collectors when

is in the range from 0.35 to 0.50 and up to 30% higher at

≈ 0.4. This study provides a method for identifying the efficiency limits of ideal SSPVT collectors and reports these limits

along with guidance for selecting optimal PV materials and spectral-splitting filters under different conditions and in different applications.

关键词

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