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Petela, R. (2021) Exergy of Solar Radiation. Solar Co-Generation of Electricity and Water, Large Scale Photovoltaic Systems. In: UNESCO-EOLSS Joint Committee, Eds., Encyclopedia of Life Support Systems (EOLSS), EOLSS Publishers, 28 p.
https://www.eolss.net

has been cited by the following article:

• TITLE: New Insight to the Surface Temperature of the Sun

  AUTHORS: Ryszard Petela

  KEYWORDS: Thermal Radiation, Radiation Temperature, Surface Temperature, Surface Emissivity, Sun Radiation Spectrum, Plank Law, Exergy of Radiation, Photosphere

  JOURNAL NAME: Energy and Power Engineering, Vol.16 No.8, August 21, 2024

  ABSTRACT: Information is given on thermal radiation from the Sun, considered in practical engineering calculations of heat exchange. It was found that although the surface temperature of the Sun is assumed to be about 5800 K, the solar spectrum data measured by Kondratyev lead to a value of at least 7134 K. Such a higher value can be obtained by interpreting the Planck formula for the black radiation spectrum for the Kondratyev data. In addition, using the Stefan-Boltzmann law, the energetic emissivity of the Sun’s surface was determined to be 0.431. Furthermore, based on Petela’s formulae for exergy of thermal radiation, the exergetic emissivity of the Sun’s surface was also calculated at the level of 0.426.