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Journal of Enhanced Heat Transfer

Impact factor: 0.400

ISSN Print: 1065-5131
ISSN Online: 1563-5074

Journal of Enhanced Heat Transfer

DOI: 10.1615/JEnhHeatTransf.v18.i3.50
pages 239-247

OPTIMUM OPTICAL PROPERTIES OF THE WORKING FLUID IN A DIRECT ABSORPTION COLLECTOR

Jiafei Zhao
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University; Key Laboratory of Ocean Energy Utilization and Energy Conversion of Ministry of Education, Dalian University of Technology
Mingjiang Ni
State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering, Zhejiang University, Hangzhou 310027
Chunhui Shou
State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering, Zhejiang University, Hangzhou 310027
Yanmei Zhang
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, P.R. China
Wei Wei
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, P.R. China
Jixiang Zhang
State Key Laboratory of Clean Energy Utilization, Institute for Thermal Power Engineering, Zhejiang University, Hangzhou, 310027, P.R. China
Zhongyang Luo
State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering, Zhejiang University, Hangzhou 310027
Kefa Cen
State Key Laboratory of Clean Energy Utilization, Institute of Thermal Power Engineering, Zhejiang University, Hangzhou 310027

ABSTRACT

This paper identifies the optimum optical properties of the working fluid used in a combined photovoltaic/thermal system. The system consists of a thermal unit placed in front of a photovoltaic solar cell module. The working fluid of the thermal unit absorbs the infrared solar radiation while the remaining visible light is transmitted and converted into electricity by the solar cell. This arrangement prevents excessive heating of the solar cell which would otherwise negatively affect its electrical efficiency. The optical properties of the working fluid were modeled based on the damped oscillator Lorentz-Drude model satisfying the Kramers-Kronig relations. The coefficients of the model were retrieved by the inverse method based on genetic algorithm, in order to (i) maximize transmission of solar radiation between 200 and 760 nm and (ii) maximize absorption in the infrared part ofthe spectrum from 760 to 2000 nm. The results indicate that the optimum system can effectively and separately use the visible and infrared parts of solar radiation. The thermal unit absorbs 88% of the infrared radiation for photothermal conversion and transmits 84% of visible light to the solar cell for photoelectric conversion.