蒸发式冷凝器设计与数值实验研究

发布时间：2018-04-20 09:15

本文选题：蒸发式冷凝器 + 参数设计　；参考：《哈尔滨商业大学》2017年硕士论文

【摘要】：制冷行业的能耗在我国全年能耗中占很大的比例。在制冷行业中,设备的节能与否直接关系水力和电力的资源浪费问题,因此制冷系统的节能问题迫在眉睫。蒸发式冷凝器是制冷系统中换热效率较高的换热器,具有高效节能、结构紧凑等优点,在制冷行业中备受关注,近几年对蒸发式冷凝器的研究越来越深入。本文依据节能减排的基本要求,对蒸发式冷凝器进行分析计算,结合实际工程应用,对其优化改进,为蒸发式冷凝器改进和节能优化提供理论依据。主要工作内容如下:(1)根据蒸发式冷凝器内部流体之间的传热过程,以工程应用为例,设计出所需设备结构型式,确定主要设备的选型,并对蒸发式冷凝器相关参数进行计算;(2)通过数值模拟,得出换热盘管管壁的温度变化,进而求出管壁平均温度,为下一步计算打下基础;(3)采用数值实验研究的方法研究了蒸发式冷凝器换热情况。重点研究了叉排和顺排两种管束结构形式以及相对位置关系对蒸发器内部流动和换热的影响。数值实验研究的结果表明,叉排管束形式更有利于蒸发式冷凝器内管外流体与制冷剂之间的换热,降低制冷剂温度。同时,获得最佳管束间距;(4)分析了影响蒸发式冷凝器的工作性能的因素。提出在蒸发式冷凝器内增加预热结构降低水垢形成的改进方案。预热部分采用翅片管形式,根据所设计蒸发式冷凝器的结构、用水量等参数,计算了预热部分翅片管长度等参数。
[Abstract]:The energy consumption of refrigeration industry accounts for a large proportion of the annual energy consumption in China. In the refrigeration industry, the energy saving of the equipment is directly related to the waste of water and electricity resources, so the energy saving problem of the refrigeration system is urgent. Evaporative condenser is a heat exchanger with high heat transfer efficiency in refrigeration system, which has the advantages of high efficiency and energy saving, compact structure and so on. It has attracted much attention in refrigeration industry. In recent years, the research on evaporative condenser has been more and more in-depth. According to the basic requirements of energy saving and emission reduction, the evaporative condenser is analyzed and calculated in this paper. Combined with the practical engineering application, the evaporative condenser is optimized and improved, which provides a theoretical basis for the improvement of evaporative condenser and the optimization of energy saving. The main work is as follows: (1) according to the heat transfer process between the internal fluids of the evaporative condenser, taking the engineering application as an example, the structure type of the required equipment is designed and the type selection of the main equipment is determined. The relevant parameters of evaporative condenser are calculated. By numerical simulation, the temperature change of the tube wall of the heat transfer coil tube is obtained, and the average temperature of the tube wall is obtained. The heat transfer of evaporative condenser is studied by numerical experiment. The influence of two kinds of bundles structure and relative position on the internal flow and heat transfer of evaporator was studied. The results of numerical experiments show that the cross-row tube bundles are more favorable to the heat transfer between the internal and external fluid and the refrigerant in the evaporative condenser and reduce the refrigerant temperature. At the same time, the optimal bundle spacing is obtained. The factors affecting the working performance of evaporative condenser are analyzed. An improved scheme of adding preheating structure to evaporative condenser to reduce the formation of scale is put forward. The preheating part is in the form of finned tube. According to the structure and water consumption of the evaporative condenser, the parameters such as the length of the preheated partial fin tube are calculated.
【学位授予单位】：哈尔滨商业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TB657;TK172

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