DescriptionUtilization of solar spectrum of a PVT collector.svg
English: PV cells only convert 15% - 20% of incident solar irradiance.
The largest share of the electromagnetic spectrum are optical and thermalization losses.
PVT collector transfer heat from the PV cells the a fluid and thus utilize the otherwise unused part of the solar spectrum to harness useful heat gains.
Source: own graph.
Reference AM1.5g spectrum based on table data obtained from NREL(https://rredc.nrel.gov/solar//spectra/am1.5/)
Optical losses based on own spectroscopical measurements of the transmittance and reflectance spectrum of a c-Si PV module at Fraunhofer ISE.
Electrical gain spectrum based on the spectral response of a c-Si PV module and scaled to match an efficiency of 15%. Measurements of spectral response at Fraunhofer ISE
Heat gain spectrum based on a thermal efficiency of 60% assuming spectrally constant heat losses
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Captions
Utilization of the electromagnetic solar spectrum by a PVT collector, indicating the solar spectrum AM1.5, optical losses, thermal losses, thermal gains, and electrical gains