新型筒状即热式热变换器研究与设计

发布时间：2018-03-19 15:12

本文选题：智能温水便座　切入点：即热式热交换器　出处：《浙江大学》2014年硕士论文　论文类型：学位论文

【摘要】：智能温水座便器在中国的出现,使国内人们日常生活的品质进一步得到提高。即热式热交换器是智能温水便座中的核心部件之一,它能够快速加热冷水使变为舒适温度的温水,并能长时间供给。因此即热式热交换器的性能优劣影响智能温水座便器的使用舒适性。目前市场上在售的即热式智能温水便座普遍存在以下问题：换热效率不高,加热器表面温度高影响到使用寿命；出水温度波动较大,洗净时给人体忽冷忽热的不舒服的洗净感；同时加热冷水直到舒适温度的温水所需要的等待时间较长等问题。论文针对现有某型号电热陶瓷即热式热交换器的换热效率不高、出水温度波动大、加热时间长等问题,进行产品改进设计,提出一种新型即热式热交换器结构,并对其结构参数进行了优化设计。本论文分析了现有量产的大功率热交换器的技术现状,利用传热学方面的知识,针对现有某型号热交换器技术上的不足点进行改善设计。论文设计了一种新型即热式热交换器,选择旋回流路流路截面高度、直线流路流路截面高度、旋回流路流路截面长度为设计参数；利用FLUENT软件对这种即热式热交换器的液体流动、传热过程及加热器表面温度分布进行数值模拟计算,研究设计参数对即热式热交换器换热性能的影响；利用CNC加工出即热式换热器实物样品,对实物样品进行换热性能试验,通过实物试验结果和模拟分析结果的对比,验证论文所建立的换热器换热性能数值模拟分析模型的准确度；最后以旋回流路流路截面高度、直线流路流路截面高度、旋回流路流路截面长度为设计参数并制作参数组合表,并利用FLUENT软件对正交表计算分析得出的参数进行模拟分析出加热器的表面温度。以加热器表面温度最低为优化目标,从而得到即热式热交换器的优化设计最佳参数。本论文工作的特点在于：针对现有产品的不足,通过改进热交换器结构,将原先的自然对流传热方式转变为强制对流传热方式,并且增强不同温度水流的互相混合作用,利用数值模拟分析方法对热交换器设计参数进行了分析和优化,从而使得热交换器换热效率大幅提升；在确定设计参数优化取值范围的时候就考虑现有的约束条件,以免将参数优化完成后,用于正式量产时才发现之前的优化参数不能使用,需要重新数值分析；用CNC加工实物进行实物试验,以验证换热器换热性能数值模拟分析模型的准确可信度。这种产品改进和优化设计方法能有效地节省改进设计成本,对企业将来不同款式的热交换器的优化设计具有重要的指导意义。
[Abstract]:The appearance of intelligent warm water seat toilet in China has further improved the quality of people's daily life. That is, heat exchanger is one of the core components of intelligent warm water stool. It can quickly heat cold water to make it comfortable. And it can be supplied for a long time. Therefore, the performance of the heat exchanger affects the comfort of the use of the intelligent warm water seat toilet. At present, there are the following problems in the market: the heat transfer efficiency is not high, The high surface temperature of the heater affects the service life, the temperature of the effluent fluctuates greatly, and the uncomfortable feeling of washing the human body is caused by the washing. At the same time, the waiting time of heating cold water to warm water at comfortable temperature is longer. In this paper, the heat transfer efficiency of a certain type of electrothermal ceramics, that is, heat exchanger, is not high, the temperature of outlet water fluctuates greatly, the heating time is long, and so on. A new type of heat exchanger structure is put forward and its structural parameters are optimized. This paper analyzes the present technical situation of high-power heat exchangers with mass production, and makes use of the knowledge of heat transfer. A new type of heat exchanger is designed to select the cross section height of the flow path and the height of the flow path of the linear flow path, aiming at the technical shortcomings of a certain type of heat exchanger, and a new type of heat exchanger is designed in this paper, which is a new type of heat exchanger, and a new type of heat exchanger is designed. The cross section length of the flow path is the design parameter, and the liquid flow, heat transfer process and surface temperature distribution of the heater are numerically simulated by FLUENT software. The effect of design parameters on the heat transfer performance of heat exchanger is studied, and the heat transfer performance of the real heat exchanger is tested by CNC, and the results are compared with the results of simulation analysis. The accuracy of the numerical simulation analysis model of heat transfer performance of heat exchangers established in this paper is verified. Finally, the cross section height of the flow path, the height of the flow path in the straight line, the length of the section of the flow path in the cycle flow path are taken as the design parameters and the parameter combination table is made. The surface temperature of the heater is simulated and analyzed by using the FLUENT software. The minimum surface temperature of the heater is considered as the optimization objective. The characteristics of this paper are as follows: to improve the structure of heat exchanger, the original natural convection heat transfer mode can be changed into forced convection heat transfer mode. The heat exchanger design parameters are analyzed and optimized by using numerical simulation analysis method, so that the heat transfer efficiency of the heat exchanger is greatly improved. When determining the range of optimization values of design parameters, the existing constraints should be considered so as not to find that the parameters before the optimization can not be used when the parameters are used in mass production, so that the numerical analysis is needed again. In order to verify the accuracy of the numerical simulation analysis model of heat transfer performance of heat exchangers, the physical test is carried out with CNC. This method of product improvement and optimization design can effectively save the cost of improved design. It has important guiding significance for the optimization design of heat exchangers of different styles in the future.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM925.39

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