Analyse Of Thermal Performence And Thermal Stress Of Solar Cavity Heat Receiver

Solar heat receiver is a kind of device that is applied to translate solar energy into thermal energy. Its thermal convection efficiency will directly affect the efficiency and economy of total system. At the same time, because solar energy has the characteristic of intermittent and unevenness of spatial distribution, it will result in huge wall temperature gradient and thermal stress in the wall of device. Seriously, it will result in deformation and fracture, affecting the security of the entire solar system. In this paper, applying Fluent(with UDF interface technology) and Ansys software, numerical simulation is used to analyze heat transfer and stress about cavity heat receiver.The context of this paper is to obtain the relationship between loss and title angle about three structure models, including ladder (TX), trapezoid type (TD) and ball (QX), taking into account radiation and the laminar natural convection. The loss is caused by radiation and convection that occur between cavity and environment. Static thermal performance is obtained in the state of three models. Then it compares heat loss and thermal performance with that of the literature. This will provide theory basis on optimization design about cavity heat receiver, which has excellent heat transfer property.To heat receiver with optical window, a two-dimensional non-steady-state model is build by using Fluent(with UDF). This article takes into the day change in solar radiation intensity of migration over time and focal plane Department uneven distribution of energy flow, and studys the dynamic heat receiver thermal performance over time and different forms of change of heat distribution.This paper's research object is cavity heat receiver made by helical coil. Applying Ansys software, it builds a three-dimensional stead-state model. In the case of giving wall heat flux and constant flux of working medium, it studys heat receiver's temperature field and stress field, analyzes the stress along the lines of the circumferential distribution of heat pipe.Through this research, it provides the necessary knowledge and theory reference for design and optimization of cavity structure, analyze of dynamic response and discussion of method of minishing receiver thermal stress.