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<p>It has been demonstrated that titanium nitride (TiN) plasmonic nanofluids enhance the performance of direct absorption collector (DAC) systems. In this work, polyacrylic acid (PAA) as a stabilizing ligand is used for preparing stable TiN nanofluids. Results indicate that the prepared TiN-PAA/ethylene glycol (EG) nanofluid is able to absorb over 99% solar radiation when the concentration is higher than 25&#xa0;mg/L. The stability of the TiN-PAA/EG nanofluid is demonstrated through both a long-term stability test (400 days ambient storage) and continuous heating test. To assess the characteristics of TiN-PAA/EG nanofluid used in a direct absorption parabolic trough collector (DAPTC), a coupled Monte Carlo ray tracing (MCRT) method and finite volume method (FVM) simulation is performed. This approach allows us to systematically investigate the impacts of nanofluid concentration, mass flow rate, and inlet temperature on temperature distribution, thermal efficiency, and exergy efficiency. Results demonstrate that the maximum thermal efficiency of 81.51% is achieved as the nanofluid concentration is 25&#xa0;mg/L, which is about 54% greater than EG. Compared to the base fluid, the TiN-PAA/EG nanofluid presents more than three times enhancement in exergy efficiency. These results underscore the significant potential of TiN-PAA/EG nanofluids for application in DAPTC systems, highlighting their ability to markedly improve system performance.</p>

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Experimental and numerical study of stable TiN plasmonic nanofluids for direct absorption parabolic trough collector

  • 期刊论文

  • 发表日期：

    2025年3月13日

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  • Zhuo Chen,
  • Xinyue Han,
  • Lu Wang,
  • Dengming Zheng

摘要

It has been demonstrated that titanium nitride (TiN) plasmonic nanofluids enhance the performance of direct absorption collector (DAC) systems. In this work, polyacrylic acid (PAA) as a stabilizing ligand is used for preparing stable TiN nanofluids. Results indicate that the prepared TiN-PAA/ethylene glycol (EG) nanofluid is able to absorb over 99% solar radiation when the concentration is higher than 25 mg/L. The stability of the TiN-PAA/EG nanofluid is demonstrated through both a long-term stability test (400 days ambient storage) and continuous heating test. To assess the characteristics of TiN-PAA/EG nanofluid used in a direct absorption parabolic trough collector (DAPTC), a coupled Monte Carlo ray tracing (MCRT) method and finite volume method (FVM) simulation is performed. This approach allows us to systematically investigate the impacts of nanofluid concentration, mass flow rate, and inlet temperature on temperature distribution, thermal efficiency, and exergy efficiency. Results demonstrate that the maximum thermal efficiency of 81.51% is achieved as the nanofluid concentration is 25 mg/L, which is about 54% greater than EG. Compared to the base fluid, the TiN-PAA/EG nanofluid presents more than three times enhancement in exergy efficiency. These results underscore the significant potential of TiN-PAA/EG nanofluids for application in DAPTC systems, highlighting their ability to markedly improve system performance.