A mathematical model of the transient temperature and fluid flow fields in the multiphase domain at a water thermal energy storage tank is composed. The model is applied for an analysis of the transport phenomena at the heat storage accumulator, charged by waste heat flows of a cogeneration unit and discharged by thermal energy supply to the heating installation of a conservatory. Numerical investigations of the transient 3D temperature and fluid flow fields in the accumulator at different charging and discharging regimes have been performed in order to estimate the temperature variations of the outflows, situated at different levels. Recommendations for the improvements of the design and the operation of the accumulator are formulated to ensure higher temperature stratification in the water domain and subsequent continuous and smooth work of the CHP and heating installations.
Mathematical model for numerical simulation of the transient heat transfer and fluid flows in water thermal energy storage tanks is developed. The model allows analysis of the thermal fields in the accumulators at different schemes and modes of charging and discharging. It was verified and validated based on experimentally obtained information about the temperature stratification at charging of a thermal accumulator at a laboratory solar system. The proposed approach for numerical study of the thermal energy storage is convenient for parametrical estimation and improvement of the efficiency of the thermal systems.
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