本文選題：熱濕耦合傳遞 + 混凝土空心砌塊��； 參考：《山東農(nóng)業(yè)大學(xué)》2017年碩士論文

【摘要】：建筑濕環(huán)境不但是評(píng)價(jià)建筑環(huán)境十分重要的指標(biāo),也是影響人體健康、舒適度、結(jié)構(gòu)耐久性和建筑能耗等的關(guān)鍵因素。濕組分在建筑材料中的遷移和積累易滋生霉菌,導(dǎo)致室內(nèi)空氣品質(zhì)下降,對(duì)室內(nèi)空氣濕度和空調(diào)的負(fù)荷特別是潛在冷卻負(fù)荷有很大影響。圍護(hù)結(jié)構(gòu)內(nèi)的濕度過高會(huì)導(dǎo)致表面或內(nèi)部結(jié)露,出現(xiàn)凝結(jié)水,影響建筑材料的保溫性能、壽命與美觀。因此,研究圍護(hù)結(jié)構(gòu)的熱濕傳遞過程具有重要意義。本文采用自行研發(fā)的可控式墻體熱濕耦合試驗(yàn)臺(tái)對(duì)混凝土夾心秸稈砌塊墻體熱濕耦合傳遞性能展開試驗(yàn)研究,根據(jù)墻體兩側(cè)環(huán)境的變化以及熱濕傳遞方向的不同,將試驗(yàn)組分為四個(gè)方面16種工況,試驗(yàn)監(jiān)測了沿厚度方向的兩條不同路線上各測點(diǎn)的溫度和相對(duì)濕度。試驗(yàn)結(jié)果顯示:(1)小麥秸稈壓縮塊的填充阻礙了墻體內(nèi)熱量的傳遞:各試驗(yàn)組的溫度變化曲線圖顯示靠近溫度變化一側(cè)墻體內(nèi)溫度變化較大,位于小麥壓縮秸稈塊中的4#測點(diǎn)處溫度曲線變化明顯。(2)墻體內(nèi)濕度場的分布主要受溫度梯度的影響,墻體內(nèi)的熱濕傳遞存在很強(qiáng)的耦合作用:熱濕傳遞方向相同的試驗(yàn)組1相對(duì)濕度曲線形態(tài)變化較其在熱濕傳遞方向相反的試驗(yàn)組2中明顯,且其相對(duì)濕度極差、各測點(diǎn)含濕量明顯大于試驗(yàn)組2。(3)小麥秸稈壓縮塊的填充阻礙了濕度的傳遞:相同熱濕傳遞方向時(shí),環(huán)境溫度、相對(duì)濕度的變化分別對(duì)墻體內(nèi)含濕量、相對(duì)濕度的影響較大,環(huán)境的變化對(duì)靠近該側(cè)的墻體的影響較大,而遠(yuǎn)離該側(cè)墻體的相對(duì)濕度、含濕量變化很小。(4)墻體內(nèi)的熱濕遷移存在著很強(qiáng)的耦合作用:墻體兩側(cè)的溫差越大墻體內(nèi)各測點(diǎn)溫度達(dá)到平衡的時(shí)間越長,環(huán)境相對(duì)濕度對(duì)墻體內(nèi)濕組分分布的影響速度緩慢。采用課題組自行研發(fā)的復(fù)合墻體熱濕耦合傳遞模擬軟件HMCT1.0對(duì)試驗(yàn)工況進(jìn)行了模擬,結(jié)果顯示各試驗(yàn)組溫度與相對(duì)濕度試驗(yàn)值與模擬值的變化趨勢基本一致,模擬溫度與試驗(yàn)溫度的平均偏差0.9℃左右,基本吻合;試驗(yàn)組1中模擬相對(duì)濕度與試驗(yàn)結(jié)果平均偏差6.8%左右,而試驗(yàn)組2中平均偏差11%左右,相對(duì)濕度產(chǎn)生偏差的主要原因是墻體內(nèi)的初始相對(duì)濕度較高。
[Abstract]:Building wet environment is not only a very important index to evaluate the building environment, but also a key factor affecting human health, comfort, structural durability and building energy consumption.The migration and accumulation of wet components in building materials can easily breed mold, which leads to the decline of indoor air quality, which has great influence on indoor air humidity and air conditioning load, especially the potential cooling load.The high humidity in the enclosure structure will lead to condensation on the surface or inside, which will affect the thermal insulation, service life and beauty of the building materials.Therefore, it is of great significance to study the heat and moisture transfer process of the envelope structure.In this paper, the heat and humidity coupling transfer performance of the concrete sandwich straw block wall is studied by using the controllable thermal-humidity coupling test bed developed by ourselves. According to the change of the environment on both sides of the wall and the different direction of heat and moisture transfer, the heat and moisture transfer performance of the concrete sandwich straw block wall is studied.The test group was divided into four aspects and 16 working conditions. The temperature and relative humidity of each point along two different routes along the thickness direction were monitored.The results showed that the filling of wheat straw compressing block hindered the heat transfer in the wall.The distribution of humidity field in the wall is mainly affected by the temperature gradient.The heat and humidity transfer in the wall has a strong coupling effect: the relative humidity curve of test group 1 with the same direction of heat and humidity transfer direction is more obvious than that in test group 2 with the opposite direction of heat and humidity transfer direction, and its relative humidity is extremely poor.The moisture content of each measuring point is obviously larger than that of the test group (2. 3) the filling of wheat straw compressing block hinders the transfer of humidity: when the heat and moisture transfer direction is the same, the changes of environment temperature and relative humidity have a great influence on the moisture content and relative humidity in the wall, respectively.The change of environment has a great influence on the wall near this side, but far away from the relative humidity of the wall on the side.There is a strong coupling effect between heat and moisture transfer in the wall. The larger the temperature difference between the two sides of the wall is, the longer the temperature reaches equilibrium, and the slower the influence of relative humidity on the distribution of wet components in the wall is.The experimental conditions are simulated by using the thermal-humidity coupling transfer simulation software HMCT1.0 developed by the research group. The results show that the temperature and relative humidity values of each test group are basically the same as the simulated values.The average deviation between the simulated temperature and the test temperature is about 0.9 鈩，

本文編號(hào)：1733587