本文選題：空氣源熱泵 + 除霜　； 參考：《哈爾濱工業(yè)大學(xué)》2014年碩士論文

【摘要】：空氣源熱泵在制熱運(yùn)行過(guò)程中，當(dāng)室外環(huán)境溫度較低、濕度較大時(shí)，室外機(jī)盤管壁面易發(fā)生結(jié)霜現(xiàn)象。霜層堆積嚴(yán)重影響機(jī)組的制熱性能和效率。因此，需為在結(jié)霜區(qū)運(yùn)行的熱泵機(jī)組設(shè)計(jì)除霜方式，現(xiàn)使用最多的除霜方式是逆循環(huán)除霜。除霜模式下，四通換向閥換向，室外機(jī)作為冷凝器，室內(nèi)機(jī)作為蒸發(fā)器。為了保證室內(nèi)環(huán)境的舒適性，除霜時(shí)室內(nèi)風(fēng)機(jī)一般處于關(guān)閉的狀態(tài)，這將導(dǎo)致除霜能量來(lái)源不足，除霜時(shí)間延長(zhǎng)，除霜效率降低。 為了達(dá)到更好的除霜效果，本文構(gòu)建了利用壓縮機(jī)廢熱的空氣源熱泵蓄能除霜系統(tǒng)�；诶碚摲治觯_定除霜能耗、相變蓄熱器蓄熱量，從而進(jìn)行相變材料的預(yù)選和相變蓄熱器的設(shè)計(jì)，并對(duì)所選相變材料的熱穩(wěn)定性進(jìn)行研究。搭建常規(guī)除霜及蓄能除霜實(shí)驗(yàn)臺(tái)，分析不同除霜模式下蓄能除霜系統(tǒng)的除霜能耗、動(dòng)態(tài)特性以及除霜對(duì)室內(nèi)環(huán)境的影響，并與常規(guī)除霜系統(tǒng)性能進(jìn)行對(duì)比。 搭建相變材料熱穩(wěn)定性測(cè)試實(shí)驗(yàn)臺(tái)，對(duì)摩爾比65%癸酸+35%月桂酸的相變材料進(jìn)行4000次的循環(huán)測(cè)試，結(jié)果顯示該二元復(fù)合有機(jī)相變材料具有較好的熱穩(wěn)定性。 分別對(duì)系統(tǒng)的常規(guī)除霜特性和利用壓縮機(jī)廢熱的蓄能除霜特性展開(kāi)實(shí)驗(yàn)研究，結(jié)果表明后者的除霜效果遠(yuǎn)優(yōu)于前者。對(duì)比四種蓄能除霜模式可知，相變蓄熱器充分蓄熱、除霜過(guò)程中室內(nèi)持續(xù)供熱的除霜模式具有良好的除霜及室內(nèi)供熱效果，同時(shí)除霜能耗也最低。 確定系統(tǒng)的除霜控制策略。當(dāng)系統(tǒng)達(dá)到除霜條件時(shí)，以相變蓄熱器外圈下部的溫度測(cè)點(diǎn)作為判斷相變蓄熱器是否充分蓄熱的依據(jù)，當(dāng)測(cè)點(diǎn)溫度值低于相變材料終止相變溫度22.0℃時(shí)，采用除霜過(guò)程中制冷劑不向室內(nèi)供熱的除霜模式，反之則采用除霜過(guò)程中制冷劑向室內(nèi)供熱的除霜模式。 本文的研究成果為相變蓄能技術(shù)的應(yīng)用推廣和空氣源熱泵在冬季供暖時(shí)運(yùn)行效果的提高提供了一定的理論支持和技術(shù)儲(chǔ)備，為降低建筑能耗起到一定的促進(jìn)作用。
[Abstract]:During the heating operation of air source heat pump, frost is easy to occur on the wall of outdoor coil unit when the outdoor environment temperature is low and humidity is high. Frost accumulation seriously affects the heating performance and efficiency of the unit. Therefore, defrosting mode should be designed for heat pump units operating in frosting zone, and reverse cycle defrosting is the most commonly used defrosting mode. Defrosting mode, four-way reversing valve reversing, outdoor machine as condenser, indoor machine as evaporator. In order to ensure the comfort of indoor environment, the indoor fan is generally closed during defrosting, which will lead to insufficient defrosting energy sources, prolonged defrosting time and lower defrosting efficiency. In order to achieve better defrosting effect, In this paper, an air source heat pump defrosting system using compressor waste heat is constructed. Based on theoretical analysis, the energy consumption of defrosting and the heat storage of phase change accumulator are determined, so that the pre-selection of phase change material and the design of phase change accumulator are carried out, and the thermal stability of the selected phase change material is studied. The defrosting energy consumption, dynamic characteristics and defrosting effect on indoor environment of defrosting system under different defrosting modes were analyzed. Compared with the conventional defrosting system, the thermal stability of phase change material was tested by 4000 cycles, and the phase change material with 65% decanoic acid 35% lauric acid was tested for 4000 times. The results show that the binary composite organic phase change material has good thermal stability. The conventional defrosting characteristics of the system and the defrosting characteristics of energy storage using the waste heat of the compressor are studied experimentally. The results show that the defrosting effect of the latter is much better than that of the former. Compared with the four defrosting modes, the defrosting mode with phase change accumulator has good defrosting and indoor heating effect, and the defrosting energy consumption is the lowest. The defrosting control strategy of the system is determined. When the defrosting condition is reached, the temperature measuring points at the bottom of the outer ring of the phase change accumulator are taken as the basis for judging whether the phase change accumulator is sufficient for storing heat. When the temperature of the measuring point is lower than 22.0 鈩，

本文編號(hào)：1987173