本文關(guān)鍵詞： 水分遷移 外保溫墻體 CHAMPS模擬 含濕狀態(tài) 傳熱系數(shù)　出處：《哈爾濱工業(yè)大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：對于嚴寒地區(qū)而言，圍護結(jié)構(gòu)保溫性能的優(yōu)劣直接影響到建筑能耗的高低。而墻體材料的含濕狀況對圍護結(jié)構(gòu)的熱工性能有著重要的影響，水分在墻體內(nèi)部積聚還會對結(jié)構(gòu)的耐久性和舒適性產(chǎn)生負面影響。因此，，墻體內(nèi)部水分遷移過程的研究對建筑節(jié)能設(shè)計和評估具有重要意義。 本文以研究EPS薄抹灰外保溫墻體內(nèi)部的水分遷移過程為核心，通過對EPS板的熱濕性能測試和外保溫墻體試件的穩(wěn)態(tài)傳濕試驗，以及哈爾濱地區(qū)外保溫墻體熱濕狀況模擬和實際測試結(jié)果的對比分析，得出墻體內(nèi)部的水分遷移規(guī)律。 首先采用加熱蒸汽加濕和水中浸泡使EPS板吸濕后測試其導(dǎo)熱系數(shù)，得出EPS板體積含濕率對其導(dǎo)熱系數(shù)的影響規(guī)律。對穩(wěn)態(tài)導(dǎo)熱系數(shù)測試過程進行CHAMPS模擬后發(fā)現(xiàn)，測試過程中試件內(nèi)部的水分分布發(fā)生了較大的變化，因此穩(wěn)態(tài)法不宜用于含濕試件導(dǎo)熱系數(shù)的測試。 然后基于冰柜和加濕器構(gòu)造的溫濕度場，進行了外保溫墻體試件的穩(wěn)態(tài)傳濕試驗。兩組試件的熱端溫度為室溫，熱端相對濕度分別99%RH和70%RH；冷端均由冰柜控制。試件受到所處溫濕度梯度作用和混凝土的自干燥作用，內(nèi)部濕度場重新分布。試件中混凝土層靠近熱端部分的相對濕度均有所增大，遠離熱端部分均降低，其中，熱端環(huán)境濕度較高的試件由于所處濕度梯度更大，其內(nèi)部的濕度變化幅度也更大；試驗結(jié)束時，基層與苯板界面的空氣層處相對濕度均持續(xù)減小。模擬結(jié)果與測試結(jié)果吻合較好。 對哈爾濱地區(qū)初始含濕飽和的EPS外保溫墻體竣工后含濕狀況的模擬結(jié)果表明，工程竣工四五年后墻體材料的體積含濕率基本達到穩(wěn)定狀態(tài)，而相對濕度受到外界環(huán)境的影響，較難達到穩(wěn)定狀態(tài)；竣工后第一年墻體內(nèi)部空氣層結(jié)露的可能性較大；竣工第三年后墻體傳熱系數(shù)受材料含濕狀況的影響極小。 最后對EPS外保溫剪力墻內(nèi)部的含濕狀態(tài)進行監(jiān)測分析，結(jié)果表明，竣工初期墻體內(nèi)混凝土層的相對濕度較高，由于所處環(huán)境相對濕度較低，混凝土層的相對濕度呈快速下降趨勢。竣工兩年后，室內(nèi)外環(huán)境成為墻體內(nèi)部濕度狀態(tài)的主要影響因素，建設(shè)期引入墻體的水分大部分已蒸發(fā)完畢。實際墻體測試結(jié)果與模擬結(jié)果之間存在較大差異，其原因主要是二者邊界條件差異較大，實測墻體的環(huán)境相對濕度遠低于模擬軟件所用值，且實際墻體含濕狀態(tài)的影響因素更多。盡管如此，模擬結(jié)果仍具有參考價值。
[Abstract]:In cold areas, building envelope insulation performance will directly affect the level of building energy consumption. And the wall material moisture condition has an important effect on the thermal performance of the retaining structure, the water inside the wall will accumulate on the durability of structure and comfort have a negative impact. Therefore, study on the internal wall of water transfer process is of great significance to the construction of energy-efficient design and evaluation.
Based on the research of EPS thin plastering exterior insulation wall inside the water transfer process as the core, through the EPS board thermal insulation performance test and external wall specimens steady-state moisture transfer test, comparative analysis of wall thermal and humidity condition simulation and actual test results, the Harbin area outside the insulation, the rule of the internal wall of the water transfer.
The heating steam humidification and water immersion EPS plate after moisture conductivity test, the influence of wet rate on the thermal conductivity of EPS containing plate volume. CHAMPS simulation of steady state thermal conductivity testing process and found that the distribution of the water change test process, so it should not be steady for wet specimens of thermal conductivity test.
Then based on the temperature and humidity field freezer and humidifier structure, the external insulation wall specimen steady-state moisture transfer test. The hot end temperature of two groups of specimens at room temperature, the hot end of relative humidity were 99%RH and 70%RH; the cold end is freezer control. Try to have the effect of drying temperature and humidity gradient. The concrete internal humidity field, re distribution. Try to increase the concrete layer close to the hot end part of the relative humidity are in far away from the hot end part decreased, the high humidity hot end environment specimens because of the humidity gradient is larger, the internal humidity change rate is higher; test at the end of the air layer at the base and interface of the benzene plate relative humidity decreasing. The simulation results agree well with the experimental results.
In Harbin area, initial moisture saturated EPS external insulation wall after the completion of the moisture condition of the simulation results show that the project is completed after four or five years of wall material volume humidity rate reaches a steady state, while the relative humidity is affected by the outside environment, more difficult to reach a steady state; after the completion of the first year of internal air layer wall condensation the possibility of a larger; third years after the completion of the heat transfer coefficient of wall material has little effect on moisture conditions.
At the end of the EPS external insulation shear wall internal moisture monitoring and analysis, the results show that the completion of the initial state, the relative humidity is high in the wall of the concrete layer, due to the low relative humidity environment, relative humidity of concrete layer decreased rapidly. Two years after completion, indoor and outdoor environment become the main factors influencing the internal humidity condition of the wall the introduction of the water wall construction period has been most evaporates. There is a big difference between the actual wall test results with simulation results, the main reason is the large differences between the two boundary conditions, the measured wall environment relative humidity is far lower than the simulation software used by value, and the actual effect of the wall moisture conditions more. Nevertheless, the simulation results still have reference value.

【學(xué)位授予單位】：哈爾濱工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TU111.41

【參考文獻】

相關(guān)期刊論文 前6條

1 張登祥;楊偉軍;;自干燥混凝土相對濕度變化理論及試驗研究[J];長江科學(xué)院院報;2011年09期

2 鄭茂余;孔凡紅;;北方地區(qū)節(jié)能建筑保溫層的設(shè)置對墻體水蒸氣滲透的影響[J];建筑節(jié)能;2007年12期

3 郭猛;;淺談中國建筑節(jié)能發(fā)展趨勢[J];建筑節(jié)能;2013年01期

4 王浩;侯素蘭;董亮;;環(huán)境溫、濕度對絕熱保溫材料導(dǎo)熱系數(shù)影響的實驗研究[J];工業(yè)計量;2012年S2期

5 馮夫順;曲云霞;郭玉莎;王志杰;;嚴寒地區(qū)公共建筑的能耗分析[J];建筑熱能通風(fēng)空調(diào);2014年01期

6 夏峗;鐔春來;馬鑫;陳澄;;墻體材料的吸濕和解吸性能研究[J];墻材革新與建筑節(jié)能;2009年11期

本文編號：1464704