Performance Analysis And Experimental Research On The Trough Solar Collector

Trough solar thermal power generation system is widely used at home and abroad.As the core component of the whole power generation system,the heat collection performance of collector directly affects the operating efficiency of the whole power generation system.This paper takes the factors influencing the thermal performance of the collector as the breakthrough point to analyze the thermal performance of the collector.The main contents are as follows:The FLUENT simulation was used to study the heat transfer performance of the fluid in the absorber under non-uniform heat flux.The influence of the inlet parameters on the temperature and velocity distribution of the outlet,heat collecting efficiency,friction coefficient and other performance parameters is discussed and analyzed.It lays a foundation for further analysis of temperature distribution of absorber wall.The results show that the friction coefficient decreases with the increasing of the inlet temperature,the non-uniformity of the temperature distribution increases,and the non-uniformity of the velocity distribution decreases;Increasing inlet velocity is beneficial to heat transfer of fluid.The absorber temperature simulated by FLUENT software were imported into the steady-state Thermal and Static Structural of ANSYS to simulate and analyze the distribution of the maximum equivalent stress and deformation of the absorber.The distribution of temperature field and stress field on absorber wall surface under different working conditions is obtained,which provides reference basis for safe operation of collector.The results show that large temperature gradient location also has a larger thermal stress.Increasing the flow rate can reduce the maximum equivalent stress of the absorber but when the fluid flow state is in the turbulent state,the improvement degree is not obvious;The geometric concentrating ratio has a greater influence on the maximum equivalent stress of the absorber.Copper alloy is more beneficial to the heat performance of absorber and reducing the deformation of absorber..An experimental platform for evaluating the performance of parabolic trough solar collector system was designed.The performance of collector was tested experimentally based on the weather in Tianjin and the influence of inlet parameters on the thermal performance of collector is analyzed.The results show that increasing the inlet temperature is helpful to improve the heat collecting efficiency of the collector,but when the temperature is at medium and high temperature,increasing the inlet fluid temperature will reduce the heat collecting efficiency.The pressure loss decreases with the increase of inlet temperature.When the flow rate is less than 2.2m~3/h,the heat collecting efficiency increases from 27%to 50%,and when the flow rate is greater than 2.2m~3/h,the heat collecting efficiency slowly increases from 50%to 60%.With the increase of solar radiation intensity,the heat collecting efficiency increases rapidly and then tends to be stable.