Thermodynamic Analysis Of Hybrid Solar-Hydrogen Energy System

With the constant development of the human civilization and rapid economic growth, energy shortage and environment are getting more and more serious, the human often achieve social progress and development at the expense of environment and energy, but the energy problem is becoming more serious, people had to discover new green clean and renewable new energy to relieve the energy crisis. Solar energy has many advantages just as simple storage, low cost etc, so more and more people pay attention to this, at this moment, solar energy has a brought forward. this So, a series of study for solar thermoelectric generator system is presented in this paper, and several proposals have been brought forward, mainly as follows:This paper established a model of energy efficiency of solar thermal power generation, simulated and analyzed the energy model of the system, based on the steady heat conduction equation, thermodynamic analysis is performed on an essential unit of thermoelectric devices, and a mathematical modeling is set up. A theoretical basis for power generation is provided.This paper established a model of energy efficiency of solar thermal power generation with Matlab/Simulink, an effect analysis for the thermal generating capability on material properties is completed. The law of thermoelectric efficiency and power output changed with the collector's absorption rate, firing rate and the thermal conductivity is found out. The requests for collector's material attributes of a solar thermoelectric plant have been specified. Finally, affecting factors such as the heat convection, cold port temperature and load are investigated, and on the base of this work, the main factors impacting on the thermoelectric generating capability are identified. Measures to improve the performance obtained, and the schemes for enhancement under the current situation are discussed. a model of solar thermoelectric device exergy analysis is setup. On the basis of the efficiency study, the thermal exergy efficiency of the device is analyzed, and the law of exergy efficiency changes coming with the condenser's exergy efficiency ratio, collector material emissivity, and collector's thermal conductivity, heat convection ratio, cold-temperature and load are found out.Finally, based on the exergy efficiency, This paper establishes a dynamic model of solar hybrid system, and develops several subsystem models that can accurately predict the dynamic characteristics of the hybrid system. The model can be used for studying dynamic characteristics, designing the control systems as well. Such complex dynamic systems which compose multiple power sources, the mathematical model and simulation model are necessary foundation for design and development of control strategy. Based on some preliminary studies and experimental data, this paper focus on the hybrid vehicle power system, discussing the mathematical and simulation modeling deeply.With this software of matlab, this paper analyses the thermal and exergy efficiency of the device, Measures to improve the performance obtained, and the schemes for enhancement under the current situation are discussed. Analyze the theoretical basis of the hybrid vehicle power system, provides a reasonable base for optimize the system.