發(fā)布時(shí)間：2018-07-10 13:57

  本文選題：相變儲(chǔ)能材料 + FLUENT��； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：能源是人類賴以生存和發(fā)展的物質(zhì)基礎(chǔ)。隨著經(jīng)濟(jì)的發(fā)展，能源緊缺成為人們?nèi)找骊P(guān)注的問(wèn)題，節(jié)能減排技術(shù)勢(shì)在必行。建筑節(jié)能是建筑業(yè)發(fā)展面臨的新課題，是未來(lái)世界建筑發(fā)展的熱點(diǎn)之一。將相變材料摻入傳統(tǒng)保溫隔熱材料中制備的新型高效節(jié)能建筑墻體材料，不僅可以降低室內(nèi)溫度波動(dòng)，提高室內(nèi)熱舒適度，還可以降低建筑采暖空調(diào)能耗，從而實(shí)現(xiàn)建筑節(jié)能。 本文采用FLUENT模擬軟件，對(duì)添加相變材料的墻板的傳熱過(guò)程進(jìn)行數(shù)值模擬。在運(yùn)用已有實(shí)驗(yàn)數(shù)據(jù)驗(yàn)證了模型的可靠性基礎(chǔ)上，利用數(shù)值模擬與實(shí)驗(yàn)分析相對(duì)比的方法，研究了相變墻板厚度及材料比例、相變墻板位置分布對(duì)儲(chǔ)能過(guò)程的影響。研究發(fā)現(xiàn)，當(dāng)板厚較小時(shí)，墻板熱阻較小，板材內(nèi)相變材料較少，其蓄熱能力會(huì)相應(yīng)的下降；當(dāng)板厚過(guò)大時(shí)，熱阻增加，相變墻板的換熱能力下降，但是會(huì)發(fā)生相變材料滲漏的情況，因此存在相變材料的最佳配比。對(duì)相變墻板位置的優(yōu)化分析得出，對(duì)以外擾為主的房間，要達(dá)到對(duì)室外溫度擾動(dòng)的較大衰減倍數(shù)和延遲效應(yīng)，應(yīng)將相變墻板內(nèi)置。 針對(duì)過(guò)去研究中粉煤灰復(fù)合相變材料導(dǎo)熱系數(shù)低的問(wèn)題[1]，本文將泡沫銅作為多孔基質(zhì)，制備出泡沫銅基復(fù)合相變材料，用DSC測(cè)量了其相變溫度、相變潛熱等物性參數(shù)，結(jié)果表明：添加泡沫銅后，復(fù)合相變材料的相變溫度為18.6℃，，相對(duì)于純相變儲(chǔ)能材料的相變溫度有所降低，但幅度不大，仍在人體舒適度溫度范圍之內(nèi)，相變潛熱為149.3J/g，比純復(fù)合相變材料的潛熱降低了26%，因而還是極具應(yīng)用價(jià)值的。并且通過(guò)實(shí)驗(yàn)和模擬的方法測(cè)得泡沫銅基復(fù)合材料在融化和凝固過(guò)程中墻體內(nèi)壁溫度和空間點(diǎn)溫度的變化曲線，比較得出，泡沫銅的添加可以顯著提高復(fù)合材料的導(dǎo)熱系數(shù)，達(dá)到建筑節(jié)能的目的。
[Abstract]:Energy is the material basis of human survival and development. With the development of economy, energy shortage has become an increasingly concerned problem, and energy saving and emission reduction technology is imperative. Building energy-saving is a new subject facing the development of the construction industry and one of the hotspots of the world architecture development in the future. A new type of high efficiency energy saving building wall material is prepared by adding phase change material into the traditional heat insulation material. It can not only reduce the fluctuation of indoor temperature and increase the indoor thermal comfort, but also reduce the energy consumption of building heating and air conditioning, so as to realize building energy saving. In this paper, the heat transfer process of wall panel with phase change material is numerically simulated by fluent software. On the basis of the reliability of the model verified by the existing experimental data, the effects of the thickness and the material ratio of the PCMs and the distribution of the PCMs on the energy storage process are studied by comparing the numerical simulation with the experimental analysis. It is found that when the thickness of the plate is small, the thermal resistance of the wall plate is smaller, and the heat storage capacity of the wall plate is less, and when the plate thickness is too large, the heat resistance increases and the heat transfer capacity of the wall plate decreases. However, the leakage of phase change material will occur, so there is the best proportion of phase change material. By optimizing the position of phase change wall panel, it is concluded that in order to achieve the large attenuation multiple and delay effect of outdoor temperature disturbance, the phase change wall board should be built in. In view of the problem of low thermal conductivity of fly ash composite phase change material in the past [1], the foam copper matrix composite phase change material was prepared by using copper foam as porous matrix. The phase change temperature and latent heat of phase change were measured by DSC. The results show that the phase transition temperature of the composite phase change material is 18.6 鈩

本文編號(hào)：2113588