Experimental And Theoretical Study On The Performance Of A Novel Vertical Capsulated Plate Ice Storage Equipment

As one of the successful measures of shifting on-peak loads to off-peak periods and strategies of electricity load management, the ice thermal storage has been widely used in many countries of the world. 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 at home and abroad, a novel vertical capsulated plate ice storage equipment was developed by our research group.Based on the phase change heat transfer theory, the two-dimensional phase change heat transfer mathematical model was developed, improving the hypothesis on temperature field of the ice storage solid only with the respective radius or radial dimension from the traditional model. The finite element heat capacity method, for the first time, was applied to finding the solutions of mathematical model on phase change temperature field in the ice plate. The functional of the heat transfer problem with phase change and its variational principle have been established. The finite element solution method and the approaches to deal with problems of latent heat and phase change boundary have been proposed. The finite element analysis software was applied to phase change simulation of the ice storage plate, which realized their real time image and animation emulations.The mathematics model of coolant temperature field in the ice storage tank, including coolant temperature distribution model and its heat transfer capability with ice storage plate model, was established by thermal resistance method, which provided theoretical reference for design, optimization and appraisal of ice storage equipment.This thesis quantitatively analyzed the influence of different factors on the performance of ice storage equipment and influences changes with different factor levels by orthogonal design method. Capabilities of the cylindrical ice storage equipment were compared with those of the rectangular ice storage equipment before to find their advantages and disadvantages. The experimental plans were drawn by the 3-factor-2-time regression orthogonal design and the quantitative expression was established between running time and factors.This thesis, for the first time, applies the fuzzy modeling and controlling theory of adaptive fuzzy inference system to the ice storage equipment's phase change heat transfer simulation. Based on the experiment results and hard computing oriented from differential equations, the soft computing theory was developed to make the neural-fuzzy computing as the main part. The ANFIS fuzzy modeling method for analyzing initialization of the ice storage quantity and real time dynamic control of the ice storage rate was introduced to gain the fuzzy inference system (FIS) structure which meets the experimental results very well. Based on the neuro-fuzzy controller or ANIFS controller in the ice storage equipment's mutli-variance adaptive controlling system, the true fuzzy modeling and controlling of the ice storage equipment were achieved and optimum controlling strategy was established.This thesis, for the first time, ice freezing and ice thaw process of the vertical capsulated plate ice storage equipment were investigated by three research methods, namely experimental research, numerical analyses method and ANFIS fuzzy modeling and controlling. Compared with the three theoretical research methods, a powerful realization method is provided for further research on the phase change heat transfer mechanism, selection of the ice plate, structural optimization of ice storage equipment, analysis of ice freezing and ice thaw capabilities. Furthermore, new ideas and new approaches are grown for development of novel ice storage equipments.