本文關(guān)鍵詞：相變儲(chǔ)熱換熱器設(shè)計(jì)及強(qiáng)化換熱機(jī)理研究　出處：《中國(guó)地質(zhì)大學(xué)(北京)》2015年博士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 相變儲(chǔ)熱換熱器 余熱回收 進(jìn)口功率 能量百分?jǐn)?shù) 數(shù)值計(jì)算

【摘要】：板式和管殼式相變儲(chǔ)熱換熱器是相變儲(chǔ)熱換熱器研究的熱點(diǎn)。但是,目前對(duì)這兩種儲(chǔ)能換熱器強(qiáng)化換熱的機(jī)理性研究還不夠；對(duì)儲(chǔ)/釋熱的工況影響研究單一；相變材料組合(m-PCMs)的無(wú)量綱化研究也鮮有報(bào)道；將相變儲(chǔ)熱換熱器真正應(yīng)用到實(shí)際的工程,來(lái)對(duì)工業(yè)余熱進(jìn)行回收利用的事例更是少之又少。本文主要針對(duì)以上問(wèn)題,從換熱器結(jié)構(gòu)、相變材料組合和換熱工況三個(gè)方面對(duì)鋸齒板式和管殼式相變儲(chǔ)熱器的換熱情況進(jìn)行模擬研究,并根據(jù)管殼式換熱器機(jī)械強(qiáng)度高、拆卸方便等特點(diǎn),設(shè)計(jì)了新型的管殼式相變儲(chǔ)熱換熱器,并通過(guò)高低溫?fù)Q熱器串級(jí)回收柴油機(jī)余熱。對(duì)鋸齒板式相變儲(chǔ)能換熱器的相變傳熱問(wèn)題建立數(shù)學(xué)模型和定解條件,并與實(shí)驗(yàn)結(jié)果進(jìn)行對(duì)比,驗(yàn)證了模型的可靠性。分析了鋸齒板的形貌對(duì)鋸齒板相變儲(chǔ)能換熱器儲(chǔ)熱性能的影響,并通過(guò)相變材料組合強(qiáng)化鋸齒板相變儲(chǔ)能換熱器的換熱性能,研究了相變溫度對(duì)換熱的影響。提出能量百分?jǐn)?shù)概念,并對(duì)相變材料組合的儲(chǔ)/釋熱參數(shù)進(jìn)行了無(wú)量綱化。提出進(jìn)口功率邊界條件,系統(tǒng)分析了在一定進(jìn)口功率條件下,進(jìn)口溫度和進(jìn)口速度對(duì)鋸齒板式相變儲(chǔ)能換熱器換熱的影響；并研究了在給定進(jìn)口功率條件下,周期性變化的進(jìn)口速度的周期性大小和振幅大小對(duì)鋸齒板式相變儲(chǔ)能換熱器的影響,得出鋸齒板相變儲(chǔ)能換熱器具有優(yōu)良的“穩(wěn)溫”性能。對(duì)管殼式相變儲(chǔ)能換熱器的相變傳熱問(wèn)題建立了數(shù)學(xué)模型和定解條件,通過(guò)與實(shí)驗(yàn)結(jié)果對(duì)比,驗(yàn)證了選取模型的可靠性。分析了相變材料管的排列方式對(duì)換熱的影響,并用梯級(jí)儲(chǔ)熱的形式來(lái)提高熱量的回收率。研究了在一定進(jìn)口功率的條件下,進(jìn)口溫度和進(jìn)口速度對(duì)梯級(jí)儲(chǔ)熱的管殼式相變儲(chǔ)能換熱器換熱的影響；并研究了周期性變化進(jìn)口速度的周期性大小和振幅大小對(duì)梯級(jí)儲(chǔ)熱的管殼式相變儲(chǔ)熱換熱器的影響,得出管殼式相變儲(chǔ)能換熱器也具有良好的“穩(wěn)溫”性能。搭建了柴油機(jī)余熱回收實(shí)驗(yàn)平臺(tái),設(shè)計(jì)了新式高/低溫管殼式相變儲(chǔ)能換熱器,研究了儲(chǔ)/釋能過(guò)程中換熱器內(nèi)部的溫度變化情況,并通過(guò)熱力學(xué)第一定律和(火積)原理分析了其儲(chǔ)能過(guò)程,發(fā)現(xiàn)管體的儲(chǔ)能效果不能忽略。
[Abstract]:Plate and shell heat storage heat exchangers are the hot spots in the research of phase change heat storage heat exchangers. However, the mechanism of these two heat storage heat exchangers is not enough. Single study on the effect of storage / heat release on the operating conditions; The dimensionless study of phase change material combination (m-PCMs) is also rarely reported. The application of phase change heat storage heat exchanger to the actual engineering, to recover industrial heat is very rare. This paper mainly aims at the above problems, from the structure of the heat exchanger. The heat transfer of sawtooth plate type and tube shell type phase change storage heater is simulated from three aspects of phase change material combination and heat transfer condition, and according to the characteristics of tube and shell heat exchanger, such as high mechanical strength, convenient disassembly and so on. A new type of shell and tube heat storage heat exchanger is designed, and the heat transfer of diesel engine is recovered by cascade heat exchanger at high and low temperature. The mathematical model and solution condition of phase change heat transfer of sawtooth plate type phase change heat storage heat exchanger are established. Compared with the experimental results, the reliability of the model is verified, and the influence of the morphology of the saw tooth plate on the heat storage performance of the phase change heat exchanger is analyzed. The effect of phase transition temperature on heat transfer was studied by strengthening the heat transfer performance of phase change heat exchanger with zigzag plate, and the concept of energy percent was put forward. The storage / heat release parameters of PCMs are dimensionless. The boundary conditions of inlet power are proposed, and the system is analyzed under certain inlet power conditions. The influence of inlet temperature and inlet velocity on heat transfer of sawtooth plate phase change heat storage heat exchanger; The influence of the periodic magnitude and amplitude of the periodically varying inlet velocity on the sawtooth plate phase change heat exchanger is also studied under the condition of the inlet power. It is concluded that the sawtooth plate phase change heat exchanger has excellent "stable temperature" performance. The mathematical model and the solution conditions of the phase change heat transfer problem of the tubular and shell type phase change energy storage heat exchanger are established, and the results are compared with the experimental results. The reliability of the selected model is verified. The influence of the arrangement of phase change material tubes on heat transfer is analyzed, and the heat recovery rate is improved by using the form of cascade heat storage. The influence of inlet temperature and inlet velocity on heat transfer of tubular and shell heat storage heat exchanger with cascade heat storage; The influence of periodic variation of inlet velocity and amplitude on the heat storage heat exchanger with tubular and shell phase change was studied. It is concluded that the tube-shell phase change heat storage heat exchanger also has good "stable temperature" performance. The experimental platform of diesel engine waste heat recovery is built, and a new high / low temperature tubular and shell type phase change energy storage heat exchanger is designed. The change of temperature in heat exchanger during energy storage / release is studied. The energy storage process of heat exchanger is analyzed by the first law of thermodynamics and the principle of fire product. It is found that the energy storage effect of tube can not be ignored.
【學(xué)位授予單位】：中國(guó)地質(zhì)大學(xué)(北京)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB34;TQ051.5

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