海水太阳池的实验和数值模拟研究-工程热物理专业论文.docxVIP

摘 摘 要 盐梯度太阳池(SGSP)作为兼集热和长期蓄热为一体的能量利用装置，是当 前新能源应用领域一个活跃的课题。本文所提出的海水太阳池模型是对盐梯度 太阳池的发展和创新，具有造价低廉、运行简便、实用性强的优点。 本文主要针对海水非对流型盐梯度太阳池，进行如下主要工作： 1．建立了海水太阳池的物理模型，重点进行可用太阳辐射能近似计算、太 阳池内温度分布和盐梯度分布的理论计算、以及太阳池的热稳定性和能量平衡 及效率的分析等； 2．完成了海水太阳池的建造、池水灌注、盐梯度保持等一系列实验工作， 对太阳池进行了持续、简便的测量，得到了大量有关温度分布和盐浓度分布的 数据； 3．应用有限差分法对太阳池内的瞬态行为进行模拟，研究各层厚度及取热 速率等因素对温度场的影响，研究温度场的演变情况等； 4．讨论了盐水的辐射透射率对太阳池性能的影响，比较了三种典型的太阳 池辐射透射模型，并且分析辐射透射率对温度场分布的影响。 本文得到的主要结论包括理论模型、实验和数值模拟三个方面，对于温度 场和浓度场的分布、各典型参数的影响、辐射透射率的影响等重要问题均有相 应结论。 关键词： 太阳池 海水太阳池 盐梯度 温度场 有限差分法 辐射透射率 浊度 AbStractA AbStract A salt—gradient solar pond(SGSP)is an excellent design for energy collection as well as for long—term energy storage，and it is also an active topic in the new energy source application domain．The seawater solar pond model is a development and innovation from the traditional SGSP,with the character of lower cost，simpler operation and more practical． This thesis has carried out the following working according tO the seawater non—convection solar pond： 1 Building up the model of seawater solar pond，then the approximate calculation about available solar radiation，the theory calculation of temperature and salt gradient distribution in the solar pond，and the analysis of the thermal stability，energy balance and efficiency have been emphasized． 2 Completing the construction，filling and salt gradient maintenance of the pond，With the chronic and simple measurements，quantity of data about temperature and salt concentration distribution has been acquired 3 Using finite difference approach to simulate the transient performance of the solar pond，and study the effect of each layer’S thickness and heat extraction on the temperature distribution，and the evolvement of the temperature profile． 4．Discussing the effect of brine 7s radiation transmission on the thermal performance of the solar pond．Comparisons were made among three typical models for radiation transmission，and a numerical simulation was performed to study the effect of the radiatio