Chapter 4 - Optical performance analysis
In Chart 4.16 the repar33on of the incident radiant flux in total transmi4ance (τ) total reflectance (ρ) together with the rela3ve absorptance of the glassblock (αgb) and the rela3ve absorptance of the DSC (αdsc) are shown in respect of the energy conserva3on law and in dependance of the wavelength. 1,00
ďƐŽƌƉƚĂŶĐĞ͕ ZĞŇĞĐƚĂŶĐĞ͕ dƌĂŶƐŵŝƩĂŶĐĞ
0,90
ʏ
0,80 0,70 0,60
ʌ
0,50 0,40
ɲ dsc
0,30 0,20
ɲ gb
0,10 0,00
400
490
550
670
760
850
940
1030
1120
1210
1300
1400
ǁĂǀĞůĞŶŐƚŚ ;ŶŵͿ Chart 4.16 Hyp. 1a: spectral data
The device behaves as an almost opaque body (with very low transmi4ance in the visible range) showing maximum transmi4ance (about 55%) at 760 nm ca. This result is very much influenced by the DSC type selected. In fact the selected DSC is more designed for high conversion efficiency to the detriment of total transmi4ance: the cell absorbs the most within the visible range, which is also the most energe3c, leading by consequence to a very low transmi4ance in the same range. We want to remember that in this simula3on an improvement in transmi4ance of about 10% can be considered in order to take in account the area not covered by the ac3ve surface in a module, which is not included in the simula3on. 157