Two-dimensional Numerical Simulation Of Trapezoidal Solar Pond Based On Large Eddy Model

With the acceleration of the transition to low-carbon,green and clean energy in the world,solar energy,as a renewable energy,has been highly valued by countries around the world due to its wide distribution and huge reserves.The salt gradient solar cell is a kind of device that can store solar energy for a long time and large scale.Therefore,the study of salt gradient solar cell has become one of the hot topics in the new utilization of solar energy.In this paper,the salt gradient solar cell is taken as the research object,and CFD numerical simulation of solar cell is carried out based on the basic theory of computational fluid dynamics(CFD).Considering the double diffusion of heat and salt,the solar radiation model,heat loss model and stability model were established based on the existing solar cell experiment system,and the trapezoidal solar cell two-dimensional mathematical model of large eddy simulation was formed.In Fluent 17.2 for computing platform,with Renault average(RANS)and large eddy simulation(LES)turbulence model,simulates the trapezoidal the operation process of the pool,pool from the sun at the center of the comparative study on the multiple perspectives,such as temperature,velocity field distribution of the two kinds of differences in the turbulence model,determined the suitable for sun ChiWei phenomenon of turbulent flow numerical simulation of turbulence model,namely the LES model;Based on the large eddy simulation model,the temperature field,velocity field,vorticity field and salinity characteristics in the trapezoidal solar cell were analyzed.The results showed that as time went on,the overall temperature of the solar cell gradually increased,and the high temperature area transferred from UCZ to LCZ.At the same level,the temperature was high in the middle and low on both sides,and the maximum temperature difference appeared in the lower part of NCZ.The velocity field is mainly distributed in LCZ,showing an obvious vortex structure.Vortices merge and split during the operation of solar pool.Vorticity field is mainly distributed in LCZ,and the high vorticity area corresponds to the region with large velocity gradient.The change trend of salt concentration is the same as that of water density in the pool.In order to improve the solar pool heating temperature,this paper puts forward in the pool surface laid transparent film and the combination of solar collectors auxiliary heating two methods,and based on large eddy simulation method,membrane model is established andthe auxiliary heating model respectively,and through the UDF in Fluent to introduce it to the sun pool model,constructs the mathematical model of enhanced solar pool based on the analysis of simulation results for two kinds of strengthening methods on the thermal performance of solar pond.The results showed that after adding plastic film,the surface heat loss of solar cell decreased and LCZ temperature increased.In the range of temperature drop,the temperature drop rate of thin film solar cell was slightly lower than that of non-film solar cell.After the solar cell is connected in parallel with the auxiliary collector,the overall temperature distribution trend of each layer is not significantly affected,and the temperature of the auxiliary collector solar cell is higher than that of the solar cell without collector.The main purpose of solar cell technology research is to apply solar cell as a low temperature heat source to practical production and life.In this paper,the economic analysis of overwintering aquaculture of Marine products with solar pond as heat source is carried out by an example,and the advantages of solar pond as heat supply for winter mariculture are discussed in order to provide useful reference for practical application of solar pond.