【作者】 马剑龙；

【导师】 李炳熙；

【作者基本信息】 哈尔滨工业大学 ， 动力工程及工程热物理， 2007， 硕士

【摘要】 随着世界能源危机的深化,冰蓄冷空调系统以其简单的结构和显著的社会经济效益得到了日益广泛地应用。特别是在我国电力极度紧张的局面下,冰蓄冷空调系统具有显著的调峰作用,对于缓解我国目前的电力紧张局面有着十分重要的重用,同时也对我国经济的科学发展有着积极的意义。在目前应用的多种蓄冰系统中,内融冰式蓄冰系统具有可靠性高,结冰融冰比较迅速等优点,从而得到了广泛的应用。因此,对蓄冰管的蓄冰、融冰特性进行深入的研究有现实的理论意义与实际的工程价值。本文出于这一目的,对内融冰式蓄冰管的传热性能展开理论研究。本文应用焓法,建立了内融冰式蓄冰管单管蓄冰过程的物理数学模型,理论分析了该过程的传热特性,同时也分析了低温冷媒的流速、入口温度、蓄冰管管径、蓄冰管外水的初始温度四个蓄冰前的初始因素对蓄冰性能的影响,为正确合理的设计蓄冰系统提供理论指导。同时,应用焓法,分别在考虑自然对流和忽略自然对流两种情况下,建立了内融冰式蓄冰管融冰时的物理数学模型,理论分析了对应过程的传热特性,同时也分析了高温热媒的流速、入口温度、蓄冰管管径、蓄冰管外冰的初始温度四个融冰前的初始因素对自然对流强度和融冰性能的影响,为正确进行系统优化、参数匹配等提供了理论指导。更多还原

【Abstract】 Along with the world energy crisis turning deeply, the ice storage system is applied more and more widely because of its simple design and obviously economy. Especially under the extreme nervous situation of the electric power in our country , the ice storage system has the special and important function of alleviating the nervous situation of the current electric power, and also has the aggressive meaning to the scientific development of the economy of our country.Among all the ice storage systems, internal-melt ice-on-tube has been widely used because of its high reliability and relatively high charging and discharging rate. Therefore, it is important to investigate the mechanism of freezing and meting about ice-on-tube. For this purpose a research of the performance of heat transfer of internal-melt ice-on-tube is carried out theoretically.Through enthalpy method, a three-dimension heat transfer mathematical model for the ice-on-tube with freezing is established. Based on the model the influences of the velocity in the tube, the inlet temperature of flow, the diameter of tube and the initial temperature of the water on the heat transfer characteristics of freezing are analyzed. It provides theoretical instruction of designing ice-on-tube.Besides, under the two circumstances with nature convection and without nature convection, a three-dimension heat transfer mathematical model for the ice-on-tube with melting is established. Based on the model the influences of the velocity in the tube, the inlet temperature of flow, the diameter of tube and the initial temperature of the ice on the natural convection of the melted water and the heat transfer characteristics of melting are analyzed. It provides theoretical instruction of optimizing system and matching parameters.更多还原