| The ice thermal storage technology, as a technology of shifting on-peak electricity loads to off-peak periods and adapting the on-peak and off-peak demand charges management, is more and more popular and attached importance by all the countries. In order to solve the problem of short-circuited of the coolant and disadvantageous effect on heat transfer from the inside air and moreover enrich the type of ice thermal storage products home and abroad, a novel vertical capsulated plate ice storage equipment was developed by our research group. In this kind of ice storage equipment, the ice board was laid vertically, and the air in it was gathered in the top small space, which can decrease the heat resistance and improve the heat transfer. To solve the problems found in the process of equipment development and research, the experiment system was improved and then it was simulated using the mathematical model and solution method based on the experimental simulation study before. The research works in this paper focus mainly on the following aspects:(1) PLC auto control system was used to solve the problem that the inlet and outlet coolant temperature cannot keep steady and have a fluctuate range;(2) Based on the mathematical model of ice freezing and ice thaw process of the vertical capsulated plate ice storage equipment set up before, it was calculated with Thomas calculation method, considering the conduction of the water along length direction of the plate;(3) The experiment stand of ice storage was rebuilt and the ice freezing and ice thaw characteristics of this improved vertical capsulated plate ice storage equipment were tested. The experiment result and simulation result were compared and analyzed; the ice freezing and ice thaw characteristics corresponding to different inlet coolant temperatures and different inlet coolant velocity of the vertical capsulated plate ice storage equipment were analyzed by simulation.(4) The data from the test of cylindrical ice storage equipment was analyzed to determine its main technical criteria, nominal storage capacity, storage volume, heat transfer area, ice freezing rate, ice thaw rate included, which are compared with those of rectangular ice storage equipment used by our research group before to find their advantages and disadvantages. It is obvious that the column ice storage equipment can undertake higher pressure and is available for larger system.The research results indicated that this vertical capsulated plate ice storage equipment has a smaller heat transfer area of 0.53m2/kWh and a smaller storage tank volume of 0.022m3/kWh and a flow resistance of about 0.015～0.017MPa and a ice freezing temperature of about -6℃; and a thaw temperature of about 4℃～8℃and a mean ice freezing rate of about 121.5kW and a mean ice thaw rate of about 194.4kW and it can reduce the consumption of material and save building space. The results are also of great referenced value for the application of this novel vertical capsulated plate ice storage equipment. |
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