【摘要】：低溫?zé)崴匕遢椛涔┡到y(tǒng)作為一種逐漸得到廣泛應(yīng)用的采暖方式,具有節(jié)約能源的優(yōu)勢(shì)。但關(guān)于低溫?zé)崴匕遢椛洳膳覂?nèi)顆粒物運(yùn)動(dòng)特性方面的研究相對(duì)較少。影響室內(nèi)顆粒物運(yùn)動(dòng)和擴(kuò)散的主要因素有室內(nèi)流場(chǎng)、顆粒物釋放源位置和顆粒物的粒徑等。因此本文將采用數(shù)值模擬方法,對(duì)低溫?zé)崴匕遢椛洳膳覂?nèi)流場(chǎng)和顆粒物運(yùn)動(dòng)特性進(jìn)行研究和分析。本文建立了低溫?zé)崴匕遢椛洳膳块g的物理模型。并選取了湍流模型、利用流體控制方程以及k-e方程,對(duì)低溫?zé)崴匕遢椛洳膳覂?nèi)的流場(chǎng)進(jìn)行數(shù)值模擬,得到了室內(nèi)溫度場(chǎng)和速度場(chǎng)分布規(guī)律。結(jié)果表明:地面附近溫度明顯高于其他區(qū)域,而且地面附近溫度分層現(xiàn)象明顯。但室內(nèi)整體溫度分布均勻�；贚agrangian方法建立顆粒相隨機(jī)軌道模型,以1μm、2.5μm、5μm、10μm和20μm 5種粒徑的顆粒物為例,對(duì)低溫?zé)崴匕遢椛洳膳覂?nèi)不同位置顆粒物釋放源以及不同粒徑顆粒物的運(yùn)動(dòng)特性進(jìn)行數(shù)值模擬,得到了顆粒物濃度隨時(shí)間和空間變化的分布規(guī)律。結(jié)果表明:(1)低溫?zé)崴匕遢椛洳膳覂?nèi),顆粒物釋放源位置對(duì)顆粒物濃度分布的影響比較明顯。顆粒物釋放源位于人員日�；顒�(dòng)平面(Z=0.3 m)時(shí),在呼吸平面顆粒物濃度相對(duì)較低,而顆粒污染物釋放源位于發(fā)煙器平面(Z=1.5 m)和位于窗戶平面處時(shí),在成人呼吸高度上的顆粒物平均濃度都較高,會(huì)對(duì)人的呼吸作用產(chǎn)生影響。1(2)不同粒徑顆粒物隨時(shí)間和空間變化的差別很大。小粒徑(d_p5μm)顆粒物對(duì)室內(nèi)氣流跟隨性強(qiáng),其運(yùn)動(dòng)是由熱浮升力和室內(nèi)氣流的共同作用產(chǎn)生的。而大粒徑(d_p10μm)顆粒物受重力作用的影響,大部分散布于房間下部區(qū)域或沉積到地面。本文對(duì)低溫?zé)崴匕遢椛洳膳覂?nèi)不同顆粒物釋放源進(jìn)行了較為全面的研究。分析了室內(nèi)顆粒物在時(shí)間和空間上的變化特點(diǎn)。為后續(xù)低溫?zé)崴匕遢椛洳膳覂?nèi)顆粒物研究方面提供了參考。
[Abstract]:The low-temperature hot-water floor radiant heating system is a kind of heating mode which is widely used, and has the advantage of saving energy. However, that research on the characteristic of the particle motion in the radiant heating chamber of the low-temperature hot-water floor is relatively low. The main factors that affect the movement and diffusion of the particles in the room include the indoor flow field, the position of the particle release source and the particle size of the particulate matter. In this paper, the numerical simulation method is used to study and analyze the indoor flow field and the particle motion characteristics of the low-temperature hot-water floor radiant heating chamber. In this paper, the physical model of the radiant heating room of the low temperature hot water floor is established. The flow field in the low-temperature hot-water floor radiant heating chamber is numerically simulated by using the fluid control equation and the k-e equation, and the distribution law of the temperature field and velocity field in the room is obtained. The results show that the temperature in the vicinity of the ground is obviously higher than that of other areas, and the temperature stratification near the ground is obvious. But the indoor whole temperature distribution is uniform. The particle-phase random track model was established based on the Lagrangian method, and the particles of the particle size of 1. m u.m, 2.5. mu.m,5. mu.m,10. mu.m and 20. m The distribution of particulate matter concentration over time and space was obtained by numerical simulation of the particle release source and the movement characteristics of different particle size particles in the low-temperature hot-water floor radiant heating room. The results show that: (1) The influence of the position of the particle release source on the concentration distribution of the particulate matter is obvious in the low-temperature hot-water floor radiant heating room. When the particulate release source is located in the person's daily active plane (Z = 0.3m), the particulate matter concentration at the respiratory plane is relatively low and the particulate contaminant release source is located at the smoker's plane (Z = 1.5 m) and at the window plane, the average concentration of particulate matter on the adult respiratory height is high, The effect of different particle size particles on the change of time and space is very large. The small particle size (d _ p5. mu.m) particulate matter is strong in the indoor air flow, and its motion is produced by the co-action of the heat floating force and the indoor air flow. While the large particle size (d _ p10. mu.m) particles are affected by the effect of gravity, most of which are dispersed in the lower part of the room or deposited on the ground. In this paper, the release of different particulate matter in the radiant heating room of the low-temperature hot-water floor is studied in a more comprehensive way. The characteristics of indoor particulate matter in time and space were analyzed. And provides a reference for subsequent low-temperature hot-water floor radiation heating indoor particle research.
【學(xué)位授予單位】：西安建筑科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU832.16

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