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Experimental, numerical and analytical investigation of a U-type evacuated tube collectors' array

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  • Korres, Dimitrios N.
  • Tzivanidis, Christos
  • Koronaki, Irene P.
  • Nitsas, Michael T.

Abstract

In this study an array of four commercial U-type evacuated tube collectors with mini-CPC reflectors was analyzed both experimentally and numerically. The operation of the array was examined in a range of 35–80 °C inlet temperature in Athens/Greece from 11:00 to 16:30 local hour at 2nd May using water as working medium. The data acquisition regarding the solar irradiation intensity, the inlet, the outlet and the ambient temperature was conducted every 10 min Α time-dependent computational fluid dynamic model was developed in Solidworks for validating the results while an analytical solution was, also, proposed. It was found that the simulation and the analytical results diverge 3.7% and 9.3% on average from the experimental regarding the thermal efficiency of the array while the mean divergence between them was 6.1%. The specific simulation gave us the opportunity to predict the receiver temperature as well as the thermal efficiency of each module something that the experimental process could not provide. The receiver temperature was also predicted through the analytical solution for further validation. The experiments were conducted in the National Technical University of Athens at the Applied Thermodynamics laboratory of Mechanical Engineering Department while the design of the simulated model was conducted in Solidworks.

Suggested Citation

  • Korres, Dimitrios N. & Tzivanidis, Christos & Koronaki, Irene P. & Nitsas, Michael T., 2019. "Experimental, numerical and analytical investigation of a U-type evacuated tube collectors' array," Renewable Energy, Elsevier, vol. 135(C), pages 218-231.
    • Handle: RePEc:eee:renene:v:135:y:2019:i:c:p:218-231
    DOI: 10.1016/j.renene.2018.12.003
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    References listed on IDEAS

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    1. Kaya, Hüseyin & Arslan, Kamil & Eltugral, Nurettin, 2018. "Experimental investigation of thermal performance of an evacuated U-Tube solar collector with ZnO/Etylene glycol-pure water nanofluids," Renewable Energy, Elsevier, vol. 122(C), pages 329-338.
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    4. Korres, Dimitrios & Tzivanidis, Christos, 2018. "A new mini-CPC with a U-type evacuated tube under thermal and optical investigation," Renewable Energy, Elsevier, vol. 128(PB), pages 529-540.
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    Citations

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    Cited by:

    1. Dimitrios N. Korres & Evangelos Bellos & Christos Tzivanidis, 2022. "Integration of a Linear Cavity Receiver in an Asymmetric Compound Parabolic Collector," Energies, MDPI, vol. 15(22), pages 1-19, November.
    2. Korres, Dimitrios N. & Tzivanidis, Christos, 2022. "A novel asymmetric compound parabolic collector under experimental and numerical investigation," Renewable Energy, Elsevier, vol. 199(C), pages 1580-1592.
    3. Korres, D.N. & Tzivanidis, C., 2019. "Numerical investigation and optimization of an experimentally analyzed solar CPC," Energy, Elsevier, vol. 172(C), pages 57-67.
    4. Yıldırım, Erdal & Yurddaş, Ali, 2021. "Assessments of thermal performance of hybrid and mono nanofluid U-tube solar collector system," Renewable Energy, Elsevier, vol. 171(C), pages 1079-1096.
    5. Fan, Leilei & Sun, Zhilin & Wan, Wuyi & Zhang, Boran, 2024. "Improved model for thermal transmission in evacuated tubes: Effect of non-uniform heat flux and circumferential conduction," Energy, Elsevier, vol. 297(C).
    6. Fathabadi, Hassan, 2020. "Novel solar collector: Evaluating the impact of nanoparticles added to the collector’s working fluid, heat transfer fluid temperature and flow rate," Renewable Energy, Elsevier, vol. 148(C), pages 1165-1173.
    7. Bhowmik, Mrinal & Muthukumar, P. & Anandalakshmi, R., 2019. "Experimental based multilayer perceptron approach for prediction of evacuated solar collector performance in humid subtropical regions," Renewable Energy, Elsevier, vol. 143(C), pages 1566-1580.
    8. Essa, Mohamed A. & Asal, Manar & Saleh, Mohamed A. & Shaltout, R.E., 2021. "A comparative study of the performance of a novel helical direct flow U-Tube evacuated tube collector," Renewable Energy, Elsevier, vol. 163(C), pages 2068-2080.

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