本文關(guān)鍵詞： 熱源塔熱泵 理論分析 數(shù)學(xué)模型 實(shí)驗(yàn)研究 溶液低壓沸騰再生　出處：《東南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：熱源塔熱泵是一種新型的建筑冷熱源方案,利用一套機(jī)組便可滿足建筑夏季制冷和冬季供熱的需求,其夏季制冷時(shí)具有水冷冷水機(jī)組的高效,冬季供熱時(shí)利用溶液在塔中與空氣換熱,吸取空氣的熱量作為熱泵的低位熱源,從根本上避免了空氣源熱泵的結(jié)霜問題。但熱源塔熱泵在冬季制熱運(yùn)行時(shí),溶液溫度較低,在塔中與空氣直接接觸,當(dāng)其水蒸汽分壓力小于空氣側(cè)水蒸汽分壓力時(shí),空氣中水分進(jìn)入溶液,引起溶液濃度降低、冰點(diǎn)升高,系統(tǒng)運(yùn)行將存在溶液結(jié)凍的危險(xiǎn)。為使系統(tǒng)安全可靠運(yùn)行,需通過溶液再生調(diào)節(jié)溶液濃度,保證溶液冰點(diǎn)穩(wěn)定、滿足使用要求。本文采用理論分析、數(shù)值模擬和實(shí)驗(yàn)研究相結(jié)合的方法,對(duì)熱源塔熱泵的溶液再生進(jìn)行了較深入的研究。提出了一種基于低壓沸騰的溶液再生方法,為解決熱源塔熱泵的溶液再生問題提供指導(dǎo),也對(duì)溶液除濕系統(tǒng)的再生研究有一定的參考意義。根據(jù)液體沸點(diǎn)會(huì)隨環(huán)境壓力降低而降低的原理,本文針對(duì)熱源塔熱泵冬季運(yùn)行的工質(zhì),提出了基于低壓沸騰的溶液再生方法,即讓溶液處于低壓環(huán)境中沸騰,利用液體沸騰強(qiáng)烈的汽化特性快速蒸發(fā)出溶液中的水分,并使蒸汽凝結(jié)成液體排出,從而溶液濃度得以提高,達(dá)到溶液再生的目的。以熱源塔熱泵運(yùn)行的常規(guī)工質(zhì)——乙二醇溶液為例,基于拉烏爾定律和康諾瓦羅夫定律繪制出乙二醇溶液的汽液平衡關(guān)系圖,研究溶液再生過程中溶液沸騰和蒸汽凝結(jié)時(shí)氣、液兩相中的溶質(zhì)含量的變化規(guī)律。并在溶液焓濃圖中,深入揭示乙二醇溶液的低壓沸騰再生的機(jī)理。通過構(gòu)建溶液低壓沸騰再生的可行性驗(yàn)證試驗(yàn)臺(tái),進(jìn)行實(shí)驗(yàn)驗(yàn)證溶液進(jìn)行低壓沸騰再生具有可行性,并對(duì)比分析乙二醇溶液在低壓沸騰和常壓沸騰時(shí)的揮發(fā)性。在此基礎(chǔ)上,設(shè)計(jì)并完善溶液低壓沸騰再生系統(tǒng),研究溶液低壓沸騰再生過程。建立溶液進(jìn)行低壓沸騰再生的數(shù)學(xué)模型,模擬溶液在不同工況再生時(shí)的參數(shù)變化規(guī)律。基于熱泵提供冷熱源,搭建了一套溶液低壓沸騰再生的實(shí)驗(yàn)臺(tái)。通過數(shù)值模擬和實(shí)驗(yàn)對(duì)比研究得出溶液再生過程中裝置壓力、溶液溫度、蒸汽凝結(jié)率和再生溶液質(zhì)量濃度等參數(shù)的變化規(guī)律。并深入研究了熱水進(jìn)口溫度、冷卻水進(jìn)口溫度和溶液初始質(zhì)量濃度對(duì)溶液再生性能的影響規(guī)律,驗(yàn)證所建立數(shù)學(xué)模型的準(zhǔn)確性,結(jié)果表明,加熱熱水溫度和溶液初始質(zhì)量濃度對(duì)溶液再生速率的影響較大,冷卻水溫度的影響較小。本文研究結(jié)果為解決熱源塔熱泵的溶液再生和溶液除濕的再生問題提供了新思路。
[Abstract]:Heat source tower heat pump is a new type of building cooling and heat source scheme. Using one set of units can meet the needs of building cooling in summer and heating in winter. The heat source tower heat pump has the high efficiency of water-cooled chillers when it is cooled in summer. When heating in winter, the solution is used in the tower to exchange heat with the air, and the heat from the air is absorbed as the low heat source of the heat pump, which fundamentally avoids the frosting problem of the air source heat pump, but when the heat source tower heat pump is heated in winter, the temperature of the solution is relatively low. In direct contact with air in the tower, when the water vapor partial pressure is less than the air side steam partial pressure, the water in the air enters into the solution, causing the solution concentration to decrease and the freezing point to rise. In order to make the system run safely and reliably, it is necessary to adjust the concentration of solution through solution regeneration, to ensure the stability of solution freezing point and to meet the requirements of application. In this paper, the solution regeneration of heat source heat pump is studied by combining numerical simulation with experimental research. A solution regeneration method based on low pressure boiling is proposed, which provides guidance for solution regeneration of heat source heat pump. According to the principle that the boiling point of liquid will decrease with the decrease of environmental pressure, a solution regeneration method based on low pressure boiling is proposed for the working fluid of heat source tower heat pump in winter. That is, boiling the solution in a low pressure environment, using the strong vaporization characteristic of liquid boiling, rapidly evaporating the water in the solution and condensing the steam into a liquid, thus increasing the concentration of the solution, In order to achieve the purpose of solution regeneration, the vapor-liquid equilibrium diagram of ethylene glycol solution is drawn based on Raoul's law and Conovarov's law, taking the conventional working medium of heat source tower heat pump as an example. The variation law of solute content in gas and liquid phase during solution boiling and steam condensation during solution regeneration is studied, and in the solution enthalpy concentration diagram, The mechanism of low pressure boiling regeneration of ethylene glycol solution was deeply revealed. The feasibility of low pressure boiling regeneration was verified by constructing a feasibility test rig for low pressure boiling regeneration of the solution. The volatility of ethylene glycol solution during low pressure boiling and atmospheric pressure boiling is analyzed. Based on this, the regeneration system of low pressure boiling solution is designed and perfected. The process of low pressure boiling regeneration of solution is studied. A mathematical model of low pressure boiling regeneration of solution is established to simulate the variation of parameters when the solution is regenerated under different conditions. Based on the heat pump, the heat and cold source is provided. A set of experimental bench for low pressure boiling regeneration of solution was set up. Through numerical simulation and experimental comparison, the pressure and temperature of the solution during the process of solution regeneration were obtained. The influence of inlet temperature of hot water, inlet temperature of cooling water and initial mass concentration of solution on the regeneration performance of the solution was studied. The accuracy of the established mathematical model is verified. The results show that the temperature of heated hot water and the initial mass concentration of the solution have great influence on the regeneration rate of the solution. The results of this paper provide a new idea for solution regeneration and solution dehumidification regeneration of heat source tower heat pump.
【學(xué)位授予單位】：東南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU83

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