太阳池的热盐双扩散模型及性能分析

A DOUBLE-DIFFUSIVE MODEL AND PERFORMANCE ANALYSIS OF SOLAR PONDS

建立了太阳池热盐双扩散数值模型,模拟结果与实验值对比,吻合较好。讨论了提热过程对太阳池热盐特性的影响规律,在提热速率不破坏NCZ稳定性的前提下,随着提热量的增大,热损失和盐损失都减小。热损降低,太阳池热效率提高;而盐损失降低,则利于NCZ内盐梯度的保持。模拟了太阳池受池底热损影响的热盐扩散规律。Soret通量所占总通量的比值在提热量和池底热损较小的情况下最大超过10%,因此Soret效应引起的盐扩散对总盐扩散起着不可忽视的作用。

A thermal and salt diffusion model of solar pond was set up,and was proved to be correct by comparing with the experimental results.The effect of process of heat extraction on thermal and salt diffusion was discussed.The result show that both heat and salt losses decreased with increasing amount of heat extraction in the range of not disturbing the stability of NCZ.The former could increase the thermal efficiency of solar pond,and the latter benefited to the stability of salt gradient in NCZ.The effect of bottom losses on thermal and salt diffusion was simulatedPercentage of the Soret to the total mass flux was over 10% when either the amount of heat extraction or the amount of bottom losses was small,so the Soret diffusion could not be ignored.