潜热太阳池初探

MODELLING THE SOLAR POND WITH LATENT HEAT STORAGE

本文报道了太阳池中物理热过程及池底相变材料相变热过程的数学模型,并利用计算机对长期运行的潜热太阳池池底温度变化情况进行了模拟,探讨了将水合盐类相变材料应用于太阳池中以提高太阳池蓄热能力的可能性。计算结果表明,在现有的技术经济条件下,利用水合盐类相变材料来提高太阳池的蓄热能力效果不大。

In this paper, mathematical model of solar pond with latent heat storage is developed to simulate the heat up process and analyse the possible improvement of the performance of solar pond. Phase change materials (PCMs) might be placed at the bottom of the pond for storaging more solar radiation absorbed at the bottom with the aid of phase change function, which can lower down the peak value of temperature profile and decrease the heat loss through the bottom and surrounding to the environment, thus the increase of thermal storage capacity of the pond would be expected.A finite difference implicit model is designed to compute the variation of bottom temperature of solar pond with PCMs as a function of time. The effect of increasing the thermal storage capacity of solar pond with PCMs input is investigated. The results show that only a PCM with high product of density and latent heat can flatten the fluctuation of the bottom temperature significantly and increase the thermal storage capacity to a large extent.