Research On Dynamic Performance Simulation Of The Trough Solar Collector

The sophisticated technology of the solar technologies is the solar parabolic trough power.As the core components of trough solar collector system,it's necessary to analysis the heat-absorbing tube,not only the optimization but also improving the efficiency of the collector.In this chapter,the main content was below.First,based on the Monte Carlo simulation,the main work was simulation of the beat flux distribution and heat flux density using the FLUENT.Writing programs,the UDF,were used as boundary condition in the FLUENT.The simulation results were in excellent agreement with the experimental results and the validity of model was verified.It concluded that the temperature difference between ambient temperature and working substance temperature and the solar radiation energy are the determining factors effected the thermal performances.The greatly temperature difference,the better heat transfer property.And the more solar radiation energy,the better heat transfer property.They would be embodied that velocity,DNI,the geometric concentrating ratio and edge angle were the factors effected on the thermal characteristic.The greater the flow rate,the greater thermal properties decreased,as well as the geometric concentrating ratio.The more DNI,the greater performance increased,as well as the edge angle.There were the optimal velocity,DNI,the geometric concentrating ratio and edge angle when operated the collector system.Second,it was also study the thermal effects of the heat-absorbing tubes though the ANSYS.It builded the thermal stresses model.And it was also analysis the numerical simulation the different conditions in the geometric concentrating ratios and edge angles.It summarized the match rule of the temperature gradients and Z=6m displacement laws.It also concluded the determining factors was temperature gradient effected the displacement.Third,under the first law and the second law of the thermodynamics,the heat transfer efficiency was the important factors effected the exergy efficiency.It was focused on the relationship between the exergy efficiency and heatloss in the different of velocity,DNI and the geometric concentrating ratios.The better the heat transfer efficiency,the better the exergy efficiency.So was the working substance temperature.It concluded that the greatly the flow rate,the more the exergy efficiency;the more the DNI,the more the exergy efficiency,and so was the geometric concentrating ratios.This chapter provided the theoretical base in the optimization collector design.