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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2401.13095 |
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| _version_ | 1866914662077956096 |
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| author | Echániz, Telmo Setién-Fernández, Iñigo Pérez-Sáez, Raúl Benjamín Prieto, Carlos Galindo, Ramón Escobar Tello, Manuel José |
| author_facet | Echániz, Telmo Setién-Fernández, Iñigo Pérez-Sáez, Raúl Benjamín Prieto, Carlos Galindo, Ramón Escobar Tello, Manuel José |
| contents | The total emissivity of the absorbing surfaces is a critical parameter in the calculation of the radiative thermal losses in solar thermal collectors. This is because the radiative heat losses have a significant economic impact on the final cost of the electricity produced in a solar thermal plant. This paper demonstrates the need to calculate the total emissivity from spectral emissivity measurements at the working temperature of the solar thermal collector, instead of using extrapolated values from spectral emissivities measured at room temperature. Usual uncertainties produced by the estimation of the total emissivity, in which its temperature dependence is only introduced by the Planck function, are analyzed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_13095 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Importance of the spectral emissivity measurements at working temperature to determine the efficiency of a solar selective coating Echániz, Telmo Setién-Fernández, Iñigo Pérez-Sáez, Raúl Benjamín Prieto, Carlos Galindo, Ramón Escobar Tello, Manuel José Applied Physics The total emissivity of the absorbing surfaces is a critical parameter in the calculation of the radiative thermal losses in solar thermal collectors. This is because the radiative heat losses have a significant economic impact on the final cost of the electricity produced in a solar thermal plant. This paper demonstrates the need to calculate the total emissivity from spectral emissivity measurements at the working temperature of the solar thermal collector, instead of using extrapolated values from spectral emissivities measured at room temperature. Usual uncertainties produced by the estimation of the total emissivity, in which its temperature dependence is only introduced by the Planck function, are analyzed. |
| title | Importance of the spectral emissivity measurements at working temperature to determine the efficiency of a solar selective coating |
| topic | Applied Physics |
| url | https://arxiv.org/abs/2401.13095 |