Stratification definition in thermal storage during charging
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A set of dimensionless parameters for predicting the occurrence and degree of thermal stratification in thermal energy storage tanks was identified. An insulated cylindrical tank filled with 300 litres of water was instrumented to allow measurement of the vertical temperature profile for various values of the Peclet and Richardson numbers. The numbers, determined by input temperature, initial tank temperature, flow rate, and tank configuration, were kept constant while the tank was charged and it was found that the position and sharpness of the thermocline were a function of the Peclet and Richardson numbers. A critical value of the Richardson number was observed, below which stratification does not occur. The difference in performance between stratified and mixed tanks was found to be the rate of heat transfer to the tank.
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Here is your answer........
A set of dimensionless parameters for predicting the occurrence and degree of thermal stratification in thermal energy storage tanks was identified. An insulated cylindrical tank filled with 300 litres of water was instrumented to allow measurement of the vertical temperature profile for various values of the Peclet and Richardson numbers. The numbers, determined by input temperature, initial tank temperature, flow rate, and tank configuration, were kept constant while the tank was charged and it was found that the position and sharpness of the thermocline were a function of the Peclet and Richardson numbers. A critical value of the Richardson number was observed, below which stratification does not occur. The difference in performance between stratified and mixed tanks was found to be the rate of heat transfer to the tank.
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