【作者】 鲁刚；

【导师】 吴国忠；

【作者基本信息】 大庆石油学院 ， 热能工程， 2003， 硕士

【摘要】 随着人类文明和工业现代化的高速发展，空气调节技术已经应用到生产和生活的各个领域。空调蓄冷技术能够将日间部分高峰用电负荷转移到夜间时段，因而成为我国当前积极推广和利用的一项利国利民的调荷节电措施。固液相变研究是工程热物理学科研究的重要内容，也是评价蓄冷装置性能的主要基础。因此，对之进行深入研究，不仅有利于蓄冷装置强化传热的实用技术的发展，而且也具有重要的理论价值。 本文基于上述背景，以冰球和冰球蓄冷器传热研究为重点，主要作了下述几项工作： 1．用接触传热的理论对冰球内的融化进行了近似分析求解。在所建立的模型中考虑了固相与液相的密度差和自然对流的影响，得出了各个时刻液膜厚度的分布、融化速率和传熟量等计算结果。计算结果与文献分析结果进行了比较，所得结果更符合实验值。 2．用奇异摄动法对冰球的凝固进行了近似分析求解，得到了第三类边界条件下凝固解的表达式。 3．建立了冰球蓄冷器的数学模型，编制了计算程序，对四个工况的蓄冷和释冷进行了模拟。 4．设计并建立了实验装置，对单个冰球的融化和凝固进行了实验，得到实验数据。与近似分析解比较，分析了误差原因。更多还原

【Abstract】 With the progress of humanity civilization and the speedy development of industry modernization, the use of air conditioning technology has become increasingly popular. The cold storage technology of air conditioning has become an important measure used to adjust loads and save electricity as the result of transforming a part of high loads in the day to low loads in the night. The solid-liquid phase change is an important research subject of the engineering thermal physics and main foundation of evaluating the cold storage containers, so to have a deep research is benefit to strengthen the heat transfer of that and to have an important theory meaning.Based of that, the main research contents as follows:1. The approximate analytical solution of melting process within a spherical enclosure is to presented by contacting heat transfer.A numerical model describing the melting process is presented by considering the difference of the solid-liquid density and natural convection. From which we can get the variation of the melt-film thickness, melting rate and heat transferred. These computing results are more reasonable than those literature from the comparison.2. Under certain appropriate assumptions, a mathematical model of water undergoing solidification in the spherical enclosure is established .The perturbation technique is employed to solve this problem. The correlation of the entire solidification time under the third boundary condition.3 . A mathematical model that concerns melting and solidification of the ice storage tank with encapsulated ice is presented .A computer program is developed to solve the model.4. The experimental apparatus has been designed and constructed. By theexperimental investigation of packed capsules with solidification and melting,we get experimental data. By incorporating the experimental results and theorypredictions, the good agreements are gotten.更多还原