Research Papers

Analysis of a Hybrid PV/T Concept Based on Wavelength Selective Mirror Films

[+] Author and Article Information
Tejas U. Ulavi

Department of Mechanical Engineering,
University of Minnesota—Twin Cities,
111 Church Street S.E.,
Minneapolis, MN 55414
e-mail: ulavi001@umn.edu

Jane H. Davidson

Department of Mechanical Engineering,
University of Minnesota—Twin Cities,
111 Church Street S.E.,
Minneapolis, MN 55414
e-mail: jhd@me.umn.edu

Tim Hebrink

3M Corporate Research Process Lab,
3M Center 208-01-01,
Maplewood, MN 55144
e-mail: thebrink@mmm.com

1Corresponding author.

Contributed by the Solar Energy Division of ASME for publication in the JOURNAL OF SOLAR ENERGY ENGINEERING. Manuscript received April 23, 2013; final manuscript received January 31, 2014; published online March 04, 2014. Assoc. Editor: Werner Platzer.

J. Sol. Energy Eng 136(3), 031009 (Mar 04, 2014) (9 pages) Paper No: SOL-13-1121; doi: 10.1115/1.4026678 History: Received April 23, 2013; Revised January 31, 2014

The technical performance of a nontracking hybrid PV/T concept that uses a wavelength selective film is modeled. The wavelength selective film is coupled with a compound parabolic concentrator (CPC) to reflect and concentrate the infrared portion of the solar spectrum onto a tubular absorber while transmitting the visible portion of the spectrum to an underlying thin-film photovoltaic module. The optical performance of the CPC/selective film is obtained through Monte Carlo ray tracing (MCRT). The CPC geometry is optimized for maximum total energy generation for a roof-top application. Applied to a roof-top in Phoenix, AZ, the hybrid PV/T provides 20% more energy compared with a system of the same area with independent side-by-side solar thermal and PV modules, but the increase is achieved at the expense of a decrease in the electrical efficiency from 8.8% to 5.8%.

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Fig. 1

Design concept for the hybrid PV/T collector

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Fig. 2

CPC geometry—nominal and truncated parameters

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Fig. 3

Spectral directional reflectance of the wavelength selective film at 0 deg and 60 deg incidence

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Fig. 4

Quantum efficiency (left) for CdTe [26] and spectral reflectance (right) for the selective film at normal incidence

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Fig. 5

Monte Carlo ray trace in the CPC cavity

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Fig. 6

Thermal resistance network for the thermal module

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Fig. 9

Annual thermal (a) and PV (b) efficiency as a function of θc and Ce, D =  0.03 m, m· =  0.015 kg/s m2

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Fig. 8

Annual thermal (left) and PV (right) efficiency, D = 0.03 m, m· = 0.015 kg/s m2

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Fig. 7

Parameters obtained through MCRT as a function of θxy and θyz for a CPC with θc = 45 deg, D = 0.03 m, and Ce = 1.4. (a) gb,r→T, gdT, (b) gb,r→PV, gdPV, and (c) Wλ,b,r→, Wλ,d.

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Fig. 10

Annual thermal (a) and PV (b) efficiency as a function of θc and D, m· = 0.015 kg/s m2

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Fig. 11

A schematic for (a) the hybrid PV/T and (b) the independent system of PV and T collectors

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Fig. 12

Total annual output (kWh) for the hybrid collector and the independent system at (a) θc =  25 deg, (b) 40 deg, and (c) 55 deg, D = 0.02 m, m· = 0.015 kg/s m2

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Fig. 13

Annual yield ratio (Eq. (21)) as a function of θc for D = 0.02 m and m· = 0.015 kg/s m2



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