【摘要】：隨著空調(diào)的普及,人們對(duì)空調(diào)的性能要求越來(lái)越高,頂板輻射空調(diào)系統(tǒng)節(jié)能、環(huán)保、舒適,得到人們廣泛的關(guān)注。因?yàn)檩椛漤敯宓膫鳠徇^(guò)程比較復(fù)雜,對(duì)該方面的研究還不完善,本文通過(guò)實(shí)驗(yàn)研究與理論分析相結(jié)合的方法研究了混凝土頂板輻射系統(tǒng)的換熱性能。首先,本文介紹了頂板輻射空調(diào)系統(tǒng)的原理、優(yōu)缺點(diǎn)及系統(tǒng)的構(gòu)成,主要介紹了系統(tǒng)的三種末端形式的結(jié)構(gòu)和特點(diǎn),并且分析了混凝土輻射頂板的傳熱機(jī)理。其次,搭建了頂板輻射的實(shí)驗(yàn)平臺(tái),通過(guò)改變埋管間距與供水溫度進(jìn)行了頂板輻射系統(tǒng)的制熱工況的實(shí)驗(yàn)研究,獲得了各組實(shí)驗(yàn)下的室內(nèi)空氣溫濕度、頂板表面溫度、地板溫度及墻體溫度等數(shù)據(jù),根據(jù)實(shí)驗(yàn)數(shù)據(jù)分析了參數(shù)變化對(duì)頂板換熱性能的影響,并且通過(guò)分析圍護(hù)結(jié)構(gòu)表面溫度、室內(nèi)溫度梯度、頂板表面輻射換熱量、平均輻射溫度及作用溫度隨時(shí)間的變化規(guī)律來(lái)研究系統(tǒng)的熱響應(yīng)特性及蓄熱性能。最后,本文以傅立葉定律為基礎(chǔ),提出了頂板表面換熱量的當(dāng)量熱阻法,提出導(dǎo)熱形狀因子的概念,將頂板填充層及以下結(jié)構(gòu)鏡像并簡(jiǎn)化得出了填充層當(dāng)量熱阻的計(jì)算公式,推導(dǎo)出當(dāng)量熱阻法計(jì)算頂板供熱量的計(jì)算方法,并且通過(guò)實(shí)例計(jì)算分析驗(yàn)證了當(dāng)量熱阻法的正確性,使用當(dāng)量熱阻法對(duì)影響頂板換熱性能的因素進(jìn)行了分析研究,研究結(jié)果表明:頂板表面主要以輻射的方式與室內(nèi)進(jìn)行熱交換,室內(nèi)舒適性好;熱水溫度越高,頂板表面溫度越高,頂板的供熱能力越強(qiáng);室內(nèi)空氣溫度越高,頂板表面溫度越高,但頂板的供熱量減小;埋管間距越大,頂板表面溫度越低,頂板的供熱量越小,因此不宜將埋管間距取得過(guò)大;埋管深度越大,頂板表面溫度越小,頂板供熱量就越小,但是影響不顯著;埋管管徑及室外空氣溫度對(duì)頂板換熱性能的影響不大。
[Abstract]:With the popularity of air conditioning, people have higher and higher requirements for the performance of air conditioning, roof radiation air-conditioning system energy saving, environmental protection, comfort, people have received widespread attention. Because the heat transfer process of radiation roof is complex and the research on this aspect is not perfect, the heat transfer performance of the radiation system of concrete roof is studied by means of the combination of experimental research and theoretical analysis. Firstly, this paper introduces the principle, merits and demerits of the radiant ceiling air conditioning system, introduces the structure and characteristics of the three end forms of the system, and analyzes the heat transfer mechanism of the radiant roof of concrete. Secondly, the experimental platform of roof radiation is built. By changing the distance between buried pipes and the temperature of water supply, the heating condition of the roof radiation system is studied, and the indoor air temperature and humidity, the surface temperature of the roof are obtained. According to the data of floor temperature and wall temperature, the influence of parameter change on the heat transfer performance of roof is analyzed, and the surface temperature, indoor temperature gradient, radiation heat transfer of roof surface are analyzed. The variation of average radiation temperature and action temperature with time is used to study the thermal response and heat storage performance of the system. Finally, on the basis of Fourier's law, an equivalent thermal resistance method for heat transfer on roof surface is proposed, and the concept of heat conduction shape factor is put forward. The structure image of the top filled layer and the following structure are mirrored and the formula for calculating the equivalent thermal resistance of the filling layer is obtained. The calculation method of equivalent thermal resistance method for calculating heat supply of roof is deduced, and the correctness of equivalent thermal resistance method is verified by an example. The factors affecting the heat transfer performance of roof are analyzed and studied by using equivalent thermal resistance method. The results show that the heat exchange between the roof surface and the room is mainly by radiation, and the indoor comfort is good; the higher the hot water temperature, the higher the roof surface temperature, the stronger the heating capacity of the roof, the higher the indoor air temperature, the higher the indoor air temperature. The higher the surface temperature of roof is, the smaller the heat supply of roof is; the larger the distance between pipes is, the lower the surface temperature of roof is, and the smaller the heat supply of roof is, therefore, it is not appropriate to make the distance of buried pipe too large; the deeper the pipe is, the smaller the surface temperature of roof is. The heat supply of roof is smaller, but the influence is not obvious, and the diameter of buried pipe and outdoor air temperature have little effect on the heat transfer performance of roof.
【學(xué)位授予單位】：湖南大學(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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本文編號(hào)：2148991