Modeling And Dynamic Analysis Of Tower Solar Collector

In recent years,China's economy has developed rapidly and the energy consumption is increasing.However,traditional energy is always non renewable and excessive utilization of it will cause pollution to the environment,so it is imperative to develop new energy.Solar power generation has been paid more and more attention for its unique advantages.Solar collector is one of the most important parts of solar power system.It is of great significance for solar power generation to study its model structure and dynamic distribution characteristics.This paper takes tower type solar exposed heat collector of Solar Two power station in America as the research object.The model with reasonable assumptions is based by using commercial software MATLAB on mass conservation,momentum conservation and energy conservation principle and molten salt(60%NaNO3 and 40%KNO3)equation of related parameters.In the paper,the heat conduction law of molten salt working pipeline is built considering the heat transfer law which is observed in the endothermic process and the heat loss in the flow process.In order to study the dynamic changes of refrigerant jump under the disturbance of different factors,the paper choose the Lagrange fluid particle tracking method,which can accurately reflect the temperature distribution characteristics of the working fluid in the pipe and the dynamic characteristics of the working fluid temperature in the same location by tracing the fluid particle at different locations in the pipeline.Based on the working fluid pipeline flow model and fluid particle tracing method,the paper designs related algorithm flow,and applies the programming function of MATLAB business software to realize this algorithm.At the same time,the model is verified in the steady state,and the accuracy of the model is ensured.In order to reduce the influence of uncertain factors in the process of model verification,a new method for calculating the efficiency of heat collector is adopted in this paper.This article takes a moment under the collector operating conditions for the initial conditions,and on this basis gives solar radiation intensity,inlet flow rate of molten salt and step disturbance of the entrance temperature of molten salt.As a result,the distribution of working fluid temperature in the pipe and the dynamic change of working fluid temperature in the same location with time are obtained,and the simulation results are analyzed theoretically.In order to explore the influence of step disturbance size on the collector system,the disturbing value of multiple groups of different factors is simulated in the same process,and the results are compared.