【摘要】：隨著空調的普及,人們對空調的性能要求越來越高,頂板輻射空調系統(tǒng)節(jié)能、環(huán)保、舒適,得到人們廣泛的關注。因為輻射頂板的傳熱過程比較復雜,對該方面的研究還不完善,本文通過實驗研究與理論分析相結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系統(tǒng)的原理、優(yōu)缺點及系統(tǒng)的構成,主要介紹了系統(tǒng)的三種末端形式的結構和特點,并且分析了混凝土輻射頂板的傳熱機理。其次,搭建了頂板輻射的實驗平臺,通過改變埋管間距與供水溫度進行了頂板輻射系統(tǒng)的制熱工況的實驗研究,獲得了各組實驗下的室內空氣溫濕度、頂板表面溫度、地板溫度及墻體溫度等數據,根據實驗數據分析了參數變化對頂板換熱性能的影響,并且通過分析圍護結構表面溫度、室內溫度梯度、頂板表面輻射換熱量、平均輻射溫度及作用溫度隨時間的變化規(guī)律來研究系統(tǒng)的熱響應特性及蓄熱性能。最后,本文以傅立葉定律為基礎,提出了頂板表面換熱量的當量熱阻法,提出導熱形狀因子的概念,將頂板填充層及以下結構鏡像并簡化得出了填充層當量熱阻的計算公式,推導出當量熱阻法計算頂板供熱量的計算方法,并且通過實例計算分析驗證了當量熱阻法的正確性,使用當量熱阻法對影響頂板換熱性能的因素進行了分析研究,研究結果表明:頂板表面主要以輻射的方式與室內進行熱交換,室內舒適性好;熱水溫度越高,頂板表面溫度越高,頂板的供熱能力越強;室內空氣溫度越高,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.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU83

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本文編號：2148991