本文選題：智能溫水便座　切入點(diǎn)：即熱式熱交換器　出處：《浙江大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：智能溫水座便器在中國(guó)的出現(xiàn),使國(guó)內(nèi)人們?nèi)粘Ｉ畹钠焚|(zhì)進(jìn)一步得到提高。即熱式熱交換器是智能溫水便座中的核心部件之一,它能夠快速加熱冷水使變?yōu)槭孢m溫度的溫水,并能長(zhǎng)時(shí)間供給。因此即熱式熱交換器的性能優(yōu)劣影響智能溫水座便器的使用舒適性。目前市場(chǎng)上在售的即熱式智能溫水便座普遍存在以下問(wèn)題：換熱效率不高,加熱器表面溫度高影響到使用壽命；出水溫度波動(dòng)較大,洗凈時(shí)給人體忽冷忽熱的不舒服的洗凈感；同時(shí)加熱冷水直到舒適溫度的溫水所需要的等待時(shí)間較長(zhǎng)等問(wèn)題。論文針對(duì)現(xiàn)有某型號(hào)電熱陶瓷即熱式熱交換器的換熱效率不高、出水溫度波動(dòng)大、加熱時(shí)間長(zhǎng)等問(wèn)題,進(jìn)行產(chǎn)品改進(jìn)設(shè)計(jì),提出一種新型即熱式熱交換器結(jié)構(gòu),并對(duì)其結(jié)構(gòu)參數(shù)進(jìn)行了優(yōu)化設(shè)計(jì)。本論文分析了現(xiàn)有量產(chǎn)的大功率熱交換器的技術(shù)現(xiàn)狀,利用傳熱學(xué)方面的知識(shí),針對(duì)現(xiàn)有某型號(hào)熱交換器技術(shù)上的不足點(diǎn)進(jìn)行改善設(shè)計(jì)。論文設(shè)計(jì)了一種新型即熱式熱交換器,選擇旋回流路流路截面高度、直線流路流路截面高度、旋回流路流路截面長(zhǎng)度為設(shè)計(jì)參數(shù)；利用FLUENT軟件對(duì)這種即熱式熱交換器的液體流動(dòng)、傳熱過(guò)程及加熱器表面溫度分布進(jìn)行數(shù)值模擬計(jì)算,研究設(shè)計(jì)參數(shù)對(duì)即熱式熱交換器換熱性能的影響；利用CNC加工出即熱式換熱器實(shí)物樣品,對(duì)實(shí)物樣品進(jìn)行換熱性能試驗(yàn),通過(guò)實(shí)物試驗(yàn)結(jié)果和模擬分析結(jié)果的對(duì)比,驗(yàn)證論文所建立的換熱器換熱性能數(shù)值模擬分析模型的準(zhǔn)確度；最后以旋回流路流路截面高度、直線流路流路截面高度、旋回流路流路截面長(zhǎng)度為設(shè)計(jì)參數(shù)并制作參數(shù)組合表,并利用FLUENT軟件對(duì)正交表計(jì)算分析得出的參數(shù)進(jìn)行模擬分析出加熱器的表面溫度。以加熱器表面溫度最低為優(yōu)化目標(biāo),從而得到即熱式熱交換器的優(yōu)化設(shè)計(jì)最佳參數(shù)。本論文工作的特點(diǎn)在于：針對(duì)現(xiàn)有產(chǎn)品的不足,通過(guò)改進(jìn)熱交換器結(jié)構(gòu),將原先的自然對(duì)流傳熱方式轉(zhuǎn)變?yōu)閺?qiáng)制對(duì)流傳熱方式,并且增強(qiáng)不同溫度水流的互相混合作用,利用數(shù)值模擬分析方法對(duì)熱交換器設(shè)計(jì)參數(shù)進(jìn)行了分析和優(yōu)化,從而使得熱交換器換熱效率大幅提升；在確定設(shè)計(jì)參數(shù)優(yōu)化取值范圍的時(shí)候就考慮現(xiàn)有的約束條件,以免將參數(shù)優(yōu)化完成后,用于正式量產(chǎn)時(shí)才發(fā)現(xiàn)之前的優(yōu)化參數(shù)不能使用,需要重新數(shù)值分析；用CNC加工實(shí)物進(jìn)行實(shí)物試驗(yàn),以驗(yàn)證換熱器換熱性能數(shù)值模擬分析模型的準(zhǔn)確可信度。這種產(chǎn)品改進(jìn)和優(yōu)化設(shè)計(jì)方法能有效地節(jié)省改進(jìn)設(shè)計(jì)成本,對(duì)企業(yè)將來(lái)不同款式的熱交換器的優(yōu)化設(shè)計(jì)具有重要的指導(dǎo)意義。
[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.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM925.39

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