| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 6478823 | Applied Energy | 2016 | 12 Pages |
•A novel hybrid concentrating photovoltaic thermal (PV/T) collector is developed.•Thermal component achieves 60× concentration using nonimaging optics.•GaAs solar cells used as spectrally selective mirrors for low energy photons.•Thermal efficiencies of 37% at 365 °C and electrical efficiencies of 8% achieved.•Combined electric efficiency reaches 25% of DNI for system cost of $283.10/m2.
A novel double stage high-concentration hybrid solar photovoltaic thermal (PV/T) collector using nonimaging optics and world record thin film single-junction gallium arsenide (GaAs) solar cells has been developed. We present a detailed design and simulation of the system, experimental setup, prototype, system performance, and economic analysis. The system uses a parabolic trough (primary concentrator) to focus sunlight towards a secondary nonimaging compound parabolic concentrator (CPC) to simultaneously generate electricity from single junction GaAs solar cells, as well as high temperature dispatchable heat. This study is novel in that (a) the solar cells inside the vacuum tube act as spectrally selective mirrors for lower energy photons to maximize the system exergy, and (b) secondary concentrator allows the thermal component to reach a concentration ratio ∼60×, which is significantly higher than conventional PV/T concentration ratios. The maximum outlet temperature reached was 365 °C, and on average the thermal efficiency of the experiment was around 37%. The maximum electrical efficiency was around 8%. The total system electricity generation is around 25% of incoming DNI, by assuming the high temperature stream is used to power a steam turbine. The installed system cost per unit of parabolic trough aperture area is $283.10 per m2.
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