Thermal stratification in a hot water tank established by heat loss from the tank

Jianhua Fan (Author), Simon Furbo (Author)

    Research output: Non-textual formSound/Visual production (digital)Research

    Abstract

    Results of experimental and numerical investigations of thermal stratification and natural convection in a vertical cylindrical hot water tank during standby periods are presented. The transient fluid flow and heat transfer in the tank during cooling caused by heat loss are investigated by computational fluid dynamics (CFD) calculations and by thermal measurements. A tank with uniform temperatures and thermal stratification is studied. The distribution of the heat loss coefficient for the different parts of the tank is measured by tests and used as input to the CFD model. The investigations focus on the natural buoyancy resulting in downward flow along the tank side walls due to heat loss of the tank and the influence on thermal stratification of the tank by the downward flow and the corresponding upward flow in the central parts of the tank. Water temperatures at different levels of the tank are measured and compared to CFD calculated temperatures. The investigations will gain insight into the natural buoyancy driven flow in the tank. It is elucidated how thermal stratification in the tank is influenced by the natural convection and how the heat loss from the tank sides will be distributed at different levels of the tank for different thermal conditions.
    Original languageEnglish
    Publication date2009
    Publication statusPublished - 2009
    Event29th Biennial Solar World Congress of the International Solar Energy Society - Johannesburg, South Africa
    Duration: 11 Oct 200914 Oct 2009
    https://www.ises.org/ISES.nsf/5c990687ba31ff01c12568b3004ef917/923deb7994fe1394c1257124004330ed?OpenDocument

    Conference

    Conference29th Biennial Solar World Congress of the International Solar Energy Society
    Country/TerritorySouth Africa
    CityJohannesburg
    Period11/10/200914/10/2009
    Internet address

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