Details
| Original language | English |
|---|---|
| Pages (from-to) | 1577-1592 |
| Number of pages | 16 |
| Journal | International Journal of Thermophysics |
| Volume | 22 |
| Issue number | 5 |
| Publication status | Published - Sept 2001 |
| Externally published | Yes |
Abstract
Photovoltaic solar cells are used for the direct conversion of solar radiation to electric power. To evaluate the efficiency of this energy conversion process, all in- and outgoing fluxes in the thermodynamic balance equations for energy and entropy must be known. The spatial and spectral distribution of radiation energy intensities must be known to calculate the radiation energy fluxes. To calculate the entropy fluxes, additional information on the coherence properties of the radiation field is essential. This information is expressed by the degree of polarization. First results of measurements of the optical properties of a solar cell are presented. The calculation procedure to obtain the outgoing energy and entropy fluxes is described. The experimental apparatus introduced in this paper yields the spectral directional emissivity by comparing the sample radiation with the radiation from an isothermal cavity. The degree of polarization of the emitted radiation is determined by a retarder/polarizer set within the apparatus. Both quantities are measured in the infrared region for wavelengths between 4.0 and 20.0 μm.
Keywords
- Degree of polarization, Emissivity, Radiation entropy, Solar cell
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Condensed Matter Physics
Sustainable Development Goals
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In: International Journal of Thermophysics, Vol. 22, No. 5, 09.2001, p. 1577-1592.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The spectral directional emissivity of photovoltaic surfaces
AU - Labuhn, D.
AU - Kabelac, S.
N1 - Funding Information: This work was supported by the Deutsche Forschungsgemeinschaft (DFG) Grant Ka 1211/4. Copyright: Copyright 2018 Elsevier B.V., All rights reserved.
PY - 2001/9
Y1 - 2001/9
N2 - Photovoltaic solar cells are used for the direct conversion of solar radiation to electric power. To evaluate the efficiency of this energy conversion process, all in- and outgoing fluxes in the thermodynamic balance equations for energy and entropy must be known. The spatial and spectral distribution of radiation energy intensities must be known to calculate the radiation energy fluxes. To calculate the entropy fluxes, additional information on the coherence properties of the radiation field is essential. This information is expressed by the degree of polarization. First results of measurements of the optical properties of a solar cell are presented. The calculation procedure to obtain the outgoing energy and entropy fluxes is described. The experimental apparatus introduced in this paper yields the spectral directional emissivity by comparing the sample radiation with the radiation from an isothermal cavity. The degree of polarization of the emitted radiation is determined by a retarder/polarizer set within the apparatus. Both quantities are measured in the infrared region for wavelengths between 4.0 and 20.0 μm.
AB - Photovoltaic solar cells are used for the direct conversion of solar radiation to electric power. To evaluate the efficiency of this energy conversion process, all in- and outgoing fluxes in the thermodynamic balance equations for energy and entropy must be known. The spatial and spectral distribution of radiation energy intensities must be known to calculate the radiation energy fluxes. To calculate the entropy fluxes, additional information on the coherence properties of the radiation field is essential. This information is expressed by the degree of polarization. First results of measurements of the optical properties of a solar cell are presented. The calculation procedure to obtain the outgoing energy and entropy fluxes is described. The experimental apparatus introduced in this paper yields the spectral directional emissivity by comparing the sample radiation with the radiation from an isothermal cavity. The degree of polarization of the emitted radiation is determined by a retarder/polarizer set within the apparatus. Both quantities are measured in the infrared region for wavelengths between 4.0 and 20.0 μm.
KW - Degree of polarization
KW - Emissivity
KW - Radiation entropy
KW - Solar cell
UR - http://www.scopus.com/inward/record.url?scp=33750675253&partnerID=8YFLogxK
U2 - 10.1023/A:1012817726103
DO - 10.1023/A:1012817726103
M3 - Article
AN - SCOPUS:33750675253
VL - 22
SP - 1577
EP - 1592
JO - International Journal of Thermophysics
JF - International Journal of Thermophysics
SN - 0195-928X
IS - 5
ER -