Modeling on Parabolic Trough Solar Thermal Power Collection System with Solid-filling Heat Storage System

As an important way of utilizing solar energy, concentrating solar power technology has received extensive attention, while thermal storage system can remedy the randomness and intermittency of the concentrating solar power generation system. Hence, there is the significance to model and simulate the trough solar collection system and heat storage system. First, the dynamic models of the solar system, the mirror field heat collection system and the pipe heat transferring system are built using the mechanism modeling method. The effects of different flow rate and light intensity on system parameters like pipe wall temperature and fluid temperature are analyzed and compared. The verification result shows that the model can effectively reflect the practical dynamic characteristics of the heat collection system. Second, a one-dimensional model of the single-tank heat storage system with solid filling materials is established according to the energy and mass conservation laws, and compared with the zero dimensional model. The effects of porosity, filling materials and other key factors on the single-tank thermocline are analyzed and compared, showing that the model can predict the temperature change, thermal stratification and other properties of the thermocline with sufficient accuracy. The model provides a theoretical basis for the optimal design of concentrating solar power generation system.