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Experimental investigation of temperature and flow distribution in a thermosyphon solar water heating system

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  • Chuawittayawuth, K.
  • Kumar, S.

Abstract

Natural circulation solar water heating systems are available in varying collector geometries (and materials), storage tank capacities and specifications of individual components. Though theoretical and experimental studies including the test procedures are available to estimate the performances of these systems, detailed experimental studies showing the temperature profiles of the absorber plate, water temperature in the riser and water flow in the riser are few. This paper presents details of experimental observations of temperature and flow distribution in a natural circulation solar water heating system and its comparison with the theoretical models. The measured profile of the absorber temperature near the riser tubes (near the bottom and top headers) conforms well with the theoretical models. The values at the riser tubes near the collector inlet are found to be generally much higher than those at the other risers on a clear day, while on cloudy days, these temperatures are uniform. The mean absorber plate and mean fluid temperature during a day has been estimated and compared with theoretical models. The temperature of water near the riser outlets was found to be fairly uniform especially in cloudy and partly cloudy days at a given plane during a day. The temperature of water in the riser depends on its flow rate. Measurements of glass temperature were also carried out.

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  • Chuawittayawuth, K. & Kumar, S., 2002. "Experimental investigation of temperature and flow distribution in a thermosyphon solar water heating system," Renewable Energy, Elsevier, vol. 26(3), pages 431-448.
    • Handle: RePEc:eee:renene:v:26:y:2002:i:3:p:431-448
    DOI: 10.1016/S0960-1481(01)00085-4
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    References listed on IDEAS

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    1. Kumar, Subodh & Sharma, V.B. & Kandpal, T.C. & Mullick, S.C., 1997. "Wind induced heat losses from outer cover of solar collectors," Renewable Energy, Elsevier, vol. 10(4), pages 613-616.
    2. Shariah, A.M. & Löf, G.O.G., 1996. "The optimization of tank-volume-to-collector-area ratio for a thermosyphon solar water heater," Renewable Energy, Elsevier, vol. 7(3), pages 289-300.
    3. Helwa, N. H. & Mobarak, A. M. & El-Sallak, M. S. & El-Ghetany, H. H., 1995. "Effect of hot-water consumption on temperature distribution in a horizontal solar water storage tank," Applied Energy, Elsevier, vol. 52(2-3), pages 185-197.
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    2. Kalogirou, S.A. & Agathokleous, R. & Barone, G. & Buonomano, A. & Forzano, C. & Palombo, A., 2019. "Development and validation of a new TRNSYS Type for thermosiphon flat-plate solar thermal collectors: energy and economic optimization for hot water production in different climates," Renewable Energy, Elsevier, vol. 136(C), pages 632-644.
    3. Wojcicki, David James, 2015. "The application of the Typical Day Concept in flat plate solar collector models," Renewable and Sustainable Energy Reviews, Elsevier, vol. 49(C), pages 968-974.
    4. Evangelos I. Sakellariou & Petros J. Axaopoulos & Bill Vaneck Bot & Kosmas A. Kavadias, 2022. "First Law Comparison of a Forced-Circulation Solar Water Heating System with an Identical Thermosyphon," Energies, MDPI, vol. 16(1), pages 1-21, December.
    5. Juanicó, Luis E. & Di Lalla, Nicolás & González, Alejandro D., 2017. "Full thermal-hydraulic and solar modeling to study low-cost solar collectors based on a single long LDPE hose," Renewable and Sustainable Energy Reviews, Elsevier, vol. 73(C), pages 187-195.

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