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Introducing internal light source into direct absorption solar collector for enhancing photothermal conversion performance of nanofluids.

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Title: Introducing internal light source into direct absorption solar collector for enhancing photothermal conversion performance of nanofluids.
Authors: Yang, Qianru1 (AUTHOR), Zhang, Chenghu1 (AUTHOR) chenghu.zhang@163.com, Liu, Yan1 (AUTHOR), Lin, Zichen1 (AUTHOR), Zhao, Yibo1 (AUTHOR)
Source: Renewable Energy: An International Journal. Jan2026:Part E, Vol. 256, pN.PAG-N.PAG. 1p.
Subject Terms: *Solar collectors, *Solar thermal energy, *Spectrum analysis, Photothermal conversion, Nanofluids, Light sources
Abstract: Direct absorption solar collectors (DASCs), by virtue of simplicity, environmental benefits, and cost-effectiveness, hold significant potential for solar thermal utilization. However, widespread applications face inherent limitations in photothermal conversion (PTC) efficiency due to their passive reliance on external solar irradiation. This study pioneers a novel internally radiated DASC (IR-DASC) featuring a controllable internal light source integrated within nanofluid (NF) layer. This innovative design effectively addresses the constraints of fluctuating light intensity, spectral mismatch, and optical penetration depth, thereby enhancing the PTC process using TiN-deionized water (DW)/ethylene glycol (EG) NFs. Systematic characterization under controlled flow (3-13 L/min) demonstrated a significant outlet temperature elevation of 10.52 °C and a PTC efficiency of 0.65 at optimal conditions (100 ppm, 3 L/min). As the concentration of TiN-DW/EG NF was increased from 0 ppm to 100 ppm, the heat gain efficiency was improved by at least 0.26. Spectral validation using AM1.5-matched xenon irradiation conclusively demonstrates technological viability under real-world operating conditions. Notably, the implementation of internal radiation architecture demonstrates superior thermal uniformity. Therefore, the IR-DASC provides a new paradigm, overcoming fundamental limitations of passive solar DASCs through structural innovation for enhanced efficiency and practical value. • Pioneering integration of an internal light source within the DASC structure. • PTC was actively enhanced by overcoming passive solar limitations. • TiN-DW/EG NFs achieved a 10.52 °C temperature rise at 100 ppm, 3 L/min. • A new paradigm for solar thermal conversion via structural innovation was established. [ABSTRACT FROM AUTHOR]
Copyright of Renewable Energy: An International Journal is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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Items – Name: Title
  Label: Title
  Group: Ti
  Data: Introducing internal light source into direct absorption solar collector for enhancing photothermal conversion performance of nanofluids.
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  Data: <searchLink fieldCode="AR" term="%22Yang%2C+Qianru%22">Yang, Qianru</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhang%2C+Chenghu%22">Zhang, Chenghu</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> chenghu.zhang@163.com</i><br /><searchLink fieldCode="AR" term="%22Liu%2C+Yan%22">Liu, Yan</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Lin%2C+Zichen%22">Lin, Zichen</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Zhao%2C+Yibo%22">Zhao, Yibo</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Renewable+Energy%3A+An+International+Journal%22">Renewable Energy: An International Journal</searchLink>. Jan2026:Part E, Vol. 256, pN.PAG-N.PAG. 1p.
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  Data: *<searchLink fieldCode="DE" term="%22Solar+collectors%22">Solar collectors</searchLink><br />*<searchLink fieldCode="DE" term="%22Solar+thermal+energy%22">Solar thermal energy</searchLink><br />*<searchLink fieldCode="DE" term="%22Spectrum+analysis%22">Spectrum analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Photothermal+conversion%22">Photothermal conversion</searchLink><br /><searchLink fieldCode="DE" term="%22Nanofluids%22">Nanofluids</searchLink><br /><searchLink fieldCode="DE" term="%22Light+sources%22">Light sources</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Direct absorption solar collectors (DASCs), by virtue of simplicity, environmental benefits, and cost-effectiveness, hold significant potential for solar thermal utilization. However, widespread applications face inherent limitations in photothermal conversion (PTC) efficiency due to their passive reliance on external solar irradiation. This study pioneers a novel internally radiated DASC (IR-DASC) featuring a controllable internal light source integrated within nanofluid (NF) layer. This innovative design effectively addresses the constraints of fluctuating light intensity, spectral mismatch, and optical penetration depth, thereby enhancing the PTC process using TiN-deionized water (DW)/ethylene glycol (EG) NFs. Systematic characterization under controlled flow (3-13 L/min) demonstrated a significant outlet temperature elevation of 10.52 °C and a PTC efficiency of 0.65 at optimal conditions (100 ppm, 3 L/min). As the concentration of TiN-DW/EG NF was increased from 0 ppm to 100 ppm, the heat gain efficiency was improved by at least 0.26. Spectral validation using AM1.5-matched xenon irradiation conclusively demonstrates technological viability under real-world operating conditions. Notably, the implementation of internal radiation architecture demonstrates superior thermal uniformity. Therefore, the IR-DASC provides a new paradigm, overcoming fundamental limitations of passive solar DASCs through structural innovation for enhanced efficiency and practical value. • Pioneering integration of an internal light source within the DASC structure. • PTC was actively enhanced by overcoming passive solar limitations. • TiN-DW/EG NFs achieved a 10.52 °C temperature rise at 100 ppm, 3 L/min. • A new paradigm for solar thermal conversion via structural innovation was established. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Renewable Energy: An International Journal is the property of Pergamon Press - An Imprint of Elsevier Science and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.renene.2025.124276
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      – Code: eng
        Text: English
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      – SubjectFull: Solar collectors
        Type: general
      – SubjectFull: Solar thermal energy
        Type: general
      – SubjectFull: Spectrum analysis
        Type: general
      – SubjectFull: Photothermal conversion
        Type: general
      – SubjectFull: Nanofluids
        Type: general
      – SubjectFull: Light sources
        Type: general
    Titles:
      – TitleFull: Introducing internal light source into direct absorption solar collector for enhancing photothermal conversion performance of nanofluids.
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            NameFull: Yang, Qianru
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            NameFull: Zhang, Chenghu
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            NameFull: Liu, Yan
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            NameFull: Lin, Zichen
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            NameFull: Zhao, Yibo
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            – D: 08
              M: 01
              Text: Jan2026:Part E
              Type: published
              Y: 2026
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              Value: 256
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            – TitleFull: Renewable Energy: An International Journal
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