Abstract
New ice heat storage techniques that dynamically strip off ice on the freezer of an ice-water heat storage apparatus have been studied, to increase the freezing speed. However, it is not clarified what ice shape enhances the heat storage capacity of the ice container. Then, rectangular-type ice, small-stone-type ice and snow-type ice are made to measure experimentally the ice filling-up rate in a container. Through the measurement of the rate, it is proved that the filling-up rate of the small-stone-type ice is about 65 % and the highest of all. That of the snow-type ice is about 34 % and the lowest. In the case of snow-type ice, the ice containing brine is occasionally used to decrease the friction factor in the pipe for transportation. Then, the ice filling-up rate and the heat storage capacity of snow-type ice containing brine are measured. As the results, in spite of the fact that the filling-up rate of the ice increases more remarkably than that of the above-mentioned snow-type ice without brine, the heat storage capacity does not increase much. This is because the solidification latent heat of the ice decreases through mixing of the brine. Therefore, the heat storage capacity of the ice is about 1/2 of that of the above-mentioned small-stone-type ice without brine.
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