Dynamic Simulation And Experimental Study On Direct Evaporative Small Ice Thermal Storage System

As an effective measure to balance peak and valley load of electrical net andadjust the consumption of running cost of refrigeration system, ice thermal storage andwater thermal storage air conditioning has been developed in recent years. Comparingwith mature large-scale ice thermal storage and water thermal storage air conditioningtechnology, the domestic R&D for the direct evaporative small ice thermal storage airconditioning which has a wide range of potential users is still relatively little, and norecognized results. Based on analysis of existing research results, a comprehensivestudy on the direct evaporative small ice thermal storage air conditioning system ismade for the ultimate goal of analyzing the operation mechanism of the small icethermal storage air conditioning system and creating proved experimental dynamicsimulative equations to promote the rapid development of direct evaporative small icethermal storage air conditioning.Considering the reality that the main service target of the direct evaporative smallice thermal storage air conditioning are the tertiary industry and urban and ruralresidents, regarding the vertical coil as the core component of the storage tank, deeplystudying the characteristics of the mobile carrier inside and outside the tube based onheat and mass exchange mechanism of vertical coil two-phase flow are the biggestdifference between this study and other ones.For the refrigerant in pipe, closed and solvable mathematical model is built basedon dynamic change parameters (temperature, pressure, liquid rate, gas rate, porosityfrom the point of view of mass, momentum, energy conservation), using the forwarddifference, upwind difference mathematical methods to get the dynamic curve of thetube based on the above-mentioned parameters; for the refrigerant outside the tube,according to the principle of conservation of energy, carrying out the appropriatemathematical modeling and solving to the dynamic freezing process, getting thechange curve(evaporation temperature, ice thickness).Experimental study on the actual running of the direct evaporative small icethermal storage air conditioning on a special experimental platform based on the actualworking environment of the direct evaporative small ice thermal storage airconditioning, the curve got based on the evaporation temperature, ice thickness,ice-melting temperature, the actual use of power and other parameters through certain technical means. The comparison between dynamic simulation curve based on relativeparameters and the curve based on experimental collection of relevant parameters, theentry point to improve the direct evaporative small ice thermal storage air-conditioningsystems is found on the basis of distinguishing the rationality, correctness of dynamicmodel, analyzing direct evaporative small ice thermal storage air-conditioning’srunning mechanism. According to the performance curve got in the experiments, thestudy analyze the economy of the direct evaporative small ice thermal storage airconditioning based on theoretical and practical data, find the suitable operative mode.Dynamic parameters model of the direct evaporative small ice thermal storage airconditioning system established in this study (including calculations) and collectedcurve based on the specific experimental platform have a certain practical significance,lay the foundation for producing and popularization of the direct evaporative small icethermal storage air-conditioning.