梯形太阳池热性能与影响因素分析

Analyses of thermal performance and influence factors for trapezoidal solar pond

基于实验数据对梯形太阳池进行了一维数值模拟,建立了热盐双扩散模型,改进了池底反射模型、辐射透射模型和热损失模型,通过模拟与实验结果对比验证了模型有效性.根据模拟结果分析了梯形太阳池温度分布规律、热稳定性及能源效率,讨论了池水浊度对其热性能的影响.结果表明：梯形结构有利于提升太阳池热利用率;太阳池运行初期,各层能源效率在20%~50%,下对流层能源效率最为稳定,维持在25%左右;下分界层稳定性要优于上分界层,温度梯度越大分界层稳定性越差.

One-dimensional numerical simulation of the trapezoidal solar pond was conducted based on the experimental data,which included building thermal and salt double-diffusive model,modifying bottom reflection and radiation transmission model and heat dissipation model.The validity of the model has been proved by comparison between experimental data and simulation results.Based on the results of simulation,the rule of temperature distribution,the heat stability and energy efficiency of the trapezoidal solar pond were analyzed,and the effects of water turbidity on its thermal performance were discussed.The results show that trapezoidal structure is conducive to improving the heat utilization of solar pond.At the beginning of the run,energy efficiency of each layer changes between20% and 50%,the efficiency of lower convection zone is most stable,and it stabilizes at around 25%in the end.The stability of the under interface is superior to the upper interface,and worse steady interface is found for large temperature gradient.