Abstract
Based on the mixing mechanism in the TSHST (Temperature Selective Heat Storage Tank), which was obtained in previous paper, two ways of refinements on the sub-tank were made in order to improve the performance of the TSHST. The first way of refinements is to decrease the damper resistance by decreasing damper thickness and increasing outflow directions from the sub-tank to the main tank. The second way is to install the FG (Flow Guide), which restricts outflows from the sub-tank in order to control inducing surrounding low temperature waters. Under the conditions of the supplying temperatures constant and variable, experiments were conducted on the conditions corresponding to the initial stage of heat storage processes as previous paper. The heat mixed in the main-tank was calculated from the differences between temperature distributions measured and that of ideal. η was defined as a ratio of the heat mixed to that supplied. The method to evaluate the mixing conditions in the main-tank was shown by means of η. The way of decreasing damper resistance improves the temperature distributions in the sub-tank, but it does not affect η obviously. The potential of the FG for controlling mixing in the main-tank under the constant supplying temperature is considerably high. The FG increase mixing under some conditions of variable supplying temperatures, but it is effective as a whole because of its high potential for controlling mixing in the main-tank at initial stage.
