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Novel experimental approaches to investigate distribution of solar insolation around the tubes in evacuated tube solar collectors

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  • Jowzi, Mohammad
  • Veysi, Farzad
  • Sadeghi, Gholamabbas

Abstract

In this study, the exact amount of the rate of irradiance within the ambit of a tube in the evacuated tube solar collector (ETSC) has been measured in various hours of the day by means of a solar meter. Some novel correlations for determining the distribution of insolation intensity around the tube have been proposed by the analysis of experimental data. A correlation is offered by using the results of previous studies and mathematical analysis. The offered correlation is utilized to calculate the direction and the amount of the maximized insolation intensity in cross section area of the tube concerning geographical circumstances, hour angle, and the slope of the collector by denoting the solar radiation distribution function around the section of the tube. Moreover, by integrating around the tube, a correlation for calculation of the whole amount of the absorbed radiation through the absorber has been presented. In the end, the error analysis is conducted and the maximum amount of error for the proposed model is estimated to be 8% before 5 p.m., and at solar noon the amount of error is reported less than 1%. Furthermore, the energy efficiency of the constructed water heater is obtained as 65%.

Suggested Citation

  • Jowzi, Mohammad & Veysi, Farzad & Sadeghi, Gholamabbas, 2018. "Novel experimental approaches to investigate distribution of solar insolation around the tubes in evacuated tube solar collectors," Renewable Energy, Elsevier, vol. 127(C), pages 724-732.
    • Handle: RePEc:eee:renene:v:127:y:2018:i:c:p:724-732
    DOI: 10.1016/j.renene.2018.04.089
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    References listed on IDEAS

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    1. Cabanillas, R.E. & Estrada, C.A. & Avila, F., 1995. "A device for measuring the angular distribution of incident radiation on tubular solar collectors," Renewable Energy, Elsevier, vol. 6(7), pages 843-847.
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    Cited by:

    1. Sarafraz, M.M. & Tlili, I. & Tian, Zhe & Bakouri, Mohsen & Safaei, Mohammad Reza, 2019. "Smart optimization of a thermosyphon heat pipe for an evacuated tube solar collector using response surface methodology (RSM)," Physica A: Statistical Mechanics and its Applications, Elsevier, vol. 534(C).
    2. Sadeghi, Gholamabbas & Safarzadeh, Habibollah & Bahiraei, Mehdi & Ameri, Mehran & Raziani, Mohsen, 2019. "Comparative study of air and argon gases between cover and absorber coil in a cylindrical solar water heater: An experimental study," Renewable Energy, Elsevier, vol. 135(C), pages 426-436.
    3. Gholipour, Shayan & Afrand, Masoud & Kalbasi, Rasool, 2020. "Improving the efficiency of vacuum tube collectors using new absorbent tubes arrangement: Introducing helical coil and spiral tube adsorbent tubes," Renewable Energy, Elsevier, vol. 151(C), pages 772-781.
    4. Sadeghi, Gholamabbas & Pisello, Anna Laura & Safarzadeh, Habibollah & Poorhossein, Miad & Jowzi, Mohammad, 2020. "On the effect of storage tank type on the performance of evacuated tube solar collectors: Solar radiation prediction analysis and case study," Energy, Elsevier, vol. 198(C).
    5. Gong, Jing-hu & Zhang, Zhi-peng & Sun, Zhi-hao & Wang, Yu-guang & Wang, Jun & Lund, Peter D., 2023. "Thermal and thermo-mechanical analysis of a novel pass-through all-glass evacuated collector tube by combining experiment with numerical simulation," Energy, Elsevier, vol. 277(C).
    6. Nokhosteen, Arman & Sobhansarbandi, Sarvenaz, 2021. "Numerical modeling and experimental cross-validation of a solar thermal collector through an innovative hybrid CFD model," Renewable Energy, Elsevier, vol. 172(C), pages 918-928.
    7. Sarafraz, M.M. & Safaei, M.R., 2019. "Diurnal thermal evaluation of an evacuated tube solar collector (ETSC) charged with graphene nanoplatelets-methanol nano-suspension," Renewable Energy, Elsevier, vol. 142(C), pages 364-372.

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