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- W572489438 abstract "A simulation programSpiralSolwas developed in previous investigations to calculate thermal performance of a solar domestic hot water (SDHW) system with a hot water tank with a built-in heat exchanger spiral[1]. The simulation program is improved in the paper in term of prediction of thermal stratification in the tank. The transient fluid flow and heat transfer in the hot water tank during cooling caused by standby heat loss are investigated by validated computational fluid dynamics (CFD) calculations. Detailed CFD investigations are carried out to determine the influence of thickness and material property of the tank wall on thermal stratification 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 at different thermal conditions. The existing equation of the heat loss removal factor used in SpiralSol is evaluated by means of the detailed CFD calculations. A generalized new equation for the heat loss removal factor is obtained by regression. The new equation calculates the heat loss removal factor for a given temperature gradient in the tank,taking into account the influences of tank volume, height to diameter ratio, tank insulation, thickness and material property of the tankand initial thermal conditions of the tank. The equation is validated for a tank volume between 150 l and 500 l, a tank height to tank diameter ratio of 1-5,a tank wall thickness of 1.5 mm to 3 mm for a stainless steel tank and a tank wall thickness of between 3 mm to 5 mm for a normal steel tank. Accuracy and reliability of the SpiralSol program with the improved prediction of heat loss removal factor will be examined in future investigations." @default.
- W572489438 created "2016-06-24" @default.
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- W572489438 date "2015-05-01" @default.
- W572489438 modified "2023-10-02" @default.
- W572489438 title "Development of a Hot Water Tank Simulation Program with Improved Prediction of Thermal Stratification in the Tank" @default.
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- W572489438 doi "https://doi.org/10.1016/j.egypro.2015.02.115" @default.
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