Design Of Solar Energy Thermoelectric Power Generation System

With the progress of science and technology,economic development,fossil energy is increasingly scarce,the protection of the environment is imminent,the world's countries are actively developing new energy,which solar energy because of its clean and adequate reserves by all walks of life favored.With the advancement of science and technology,there will be a lot of equipment in the agricultural greenhouse,which will increase the consumption of many energy.So we designed efficient thermoelectric power generation system to provide electricity for small-scale electricity in the greenhouse.Because of the deep penetration of thermoelectric power generation technology,the efficiency of thermoelectric power generation devices developed in China is not very high.This paper designs a parabolic concentrating thermoelectric power generation system(including thermal switch automatic control system)to improve power generation efficiency.The main part of the system is parabolic concentrator,collector plate,thermoelectric power generation module,hot switch automatic control system,cooling part.This paper mainly from the following four aspects of research work:(1)First,the overall structure of the concentrating solar thermal power generation system is designed.The condenser has a parabolic mirror and has a good convergence effect on the sunlight.The parabolic concentrator concentrates the sunlight and gathers a large amount of sunlight above the concentrator centerline.above the centerline,place hot plate and thermoelectric power generation module.The collector is kept at a certain distance from the hot end of the thermoelectric power generation module,and the contact and separation of the heat collector and the hot end of the thermoelectric power generation module are automatically controlled by the thermal switch.The control system also monitors the temperature and light of the temperature difference device in real time.Finally,install a flat heat pipe cooling system at the cold end to achieve heat dissipation of the device.(2)The principle and structure of the hot switch control system in the solar thermal power generation system are introduced,and the hardware and software of the thermal switch control system are designed.This system includes monitoring of temperature and light,and through the ARM chip to determine the real-time temperature to control the motor's intelligent rotation.The upper surface of the generator system collector and the hot surface of the thermoelectric module are effectively controlled by the rotation of the stepping motor to solve the problem that the output power of the thermoelectric power generation system is unstable.(3)Heat transfer analysis of thermoelectric power generation module by thermodynamic analysis software ANSYS.Firstly,the ANSYS simulation model of single P-N unit is established,and the thermal coupling analysis of single P-N unit is carried out.The simulation results can obtain the temperature field distribution and potential field distribution of single P-N unit.The accuracy of ANSYS simulation analysis is proved by comparing the theoretical analysis results and simulation results of single P-N unit.In order to verify the effect of temperature difference on the power generation performance of the thermoelectric power generation module,the P-N unit is simulated by different temperature difference.The results show that increasing the temperature difference can effectively improve the module output voltage.Then the temperature distribution of 8 pairs of P-N junction series module and collector surface is simulated and analyzed to reveal the distribution of heat in the parts.(4)The performance test platform of the solar thermal power generation system is set up.The solar radiation intensity of the test environment is monitored by the monitoring device,measuring the surface of the collector,the temperature between the hot and the cold side of the thermoelectric power generation module.The output power of the conventional solar thermal power generation system is measured and the thermoelectric power generation device is designed with the thermal switch control system and the regulator output module to optimize the output power of the system.By comparing the output power of the conventional system and the optimization system,It is proved that the output voltage and output power of the optimized system are more stable.