摘 要
在暖通空調(diào)領(lǐng)域，節(jié)能和環(huán)保成為國內(nèi)外學(xué)者研究的重點(diǎn)。輻射供冷空調(diào)系統(tǒng)作為一種節(jié)能綠色空調(diào)系統(tǒng)，有著良好的應(yīng)用前景。但是輻射供冷存在單位面積供冷能力較低、無法消除室內(nèi)潛熱負(fù)荷和輻射板表面易結(jié)露的缺點(diǎn)，成為該技術(shù)推廣應(yīng)用的主要障礙?；谶@一背景，本文提出輻射供冷與貼附射流復(fù)合空調(diào)系統(tǒng)，該復(fù)合空調(diào)系統(tǒng)不僅能有效避免輻射板表面結(jié)露，而且通過貼附射流送風(fēng)可以很好的滿足室內(nèi)空氣品質(zhì)要求。
本文以江蘇科技大學(xué)現(xiàn)有的一個輻射供冷實(shí)驗(yàn)房間為主要研究對象，根據(jù)實(shí)驗(yàn)房間夏季時的熱濕特點(diǎn)建立了物理模型，采用鴻業(yè)暖通空調(diào)負(fù)荷軟件計(jì)算了實(shí)驗(yàn)房間的逐時顯熱冷負(fù)荷，確定了模型的相關(guān)參數(shù)。運(yùn)用CFD軟件進(jìn)行數(shù)值模擬，首先確定了系統(tǒng)的送風(fēng)參數(shù)，然后分別評價了采用貼附射流和普通送風(fēng)兩種方式下輻射供冷房間的溫濕度場、速度場及其舒適性，結(jié)果表明，兩種送風(fēng)方式下房間內(nèi)的熱舒適性均較好，但在相同參數(shù)下采用貼附射流時，可有效避免冷輻射板表面結(jié)露。
影響輻射供冷與貼附射流復(fù)合空調(diào)系統(tǒng)的因素有很多，本文選擇性的考察了送風(fēng)量、室內(nèi)設(shè)計(jì)參數(shù)、送風(fēng)口寬度、冷輻射板高度以及濕源散濕量對系統(tǒng)的影響，旨在探討改進(jìn)復(fù)合系統(tǒng)的方法。
本文還對輻射供冷與貼附射流復(fù)合空調(diào)系統(tǒng)進(jìn)行了實(shí)驗(yàn)研究，搭建了實(shí)驗(yàn)系統(tǒng)，對冷輻射板表面的結(jié)露現(xiàn)象及貼附射流氣流組織進(jìn)行了驗(yàn)證性實(shí)驗(yàn)，實(shí)驗(yàn)結(jié)果與數(shù)值模擬結(jié)果基本吻合。本文的研究成果對輻射供冷的防結(jié)露設(shè)計(jì)具有指導(dǎo)意義和實(shí)用價值。

關(guān)鍵詞：輻射供冷；貼附射流；結(jié)露；負(fù)荷計(jì)算；數(shù)值模擬；實(shí)驗(yàn)研究


Abstract
In the HVAC field, energy saving and environmental protection have become the emphasis on the recent research of domestic and foreign scholars. As a kind of energy saving air-conditioning system, radiant cooling has a good application prospect. However, the existence of shortcomings, such as low cooling capacity on unit area, inability to eliminate the latent heat and the risk of condensation on radiant panels become major obstacles to limit the market penetration of radiant cooling. Based on this background, the combined air-conditioning system of radiant cooling and wall-attached-jet is proposed in this paper. The combined air-conditioning system not only can reduce the risk of condensation on radiant panels, but also the indoor air quality can meet the requirements of thermal comfort through the supply attached jet.
This paper choses a radiant cooling experimental room of Jiang Su University of Science and Technology as main research object. Physics models are established based on the indoor temperature and humidity characteristics in summer. Hourly indoor sensible heat cooling load is calculated by Hongye HVAC load computing software and the main parameters are determined. CFD software is used to simulate. Air supply parameters are firstly determined. Then, the wall-attached-jet and ordinary air-supply are respectively simulated to study indoor air temperature field，humidity field，velocity field and thermal comfort field. The results show that the wall-attached-jet can effectively reduce the risk of condensation on cold panel.
There are many factors that affect the combined air-conditioning system of radiant cooling and wall-attached-jet. In order to investigate the improvement of the system, this paper inspects the influences of different supply air volume, indoor design parameter, air diffuser width, cold panel height and moisture gain.
This paper also does the experimental study to the combined air-conditioning system and builds the experiment system. Through the experimental observation of the phenomenone of condensation on the cold panel and the wall-attached-jet flow field, the experiment has the same results with the numerical calculations. The result of this research has much theoretical and utilizable value for the design of anti-condensation of radiant cooling.

Keywords: radiant cooling; wall-attached-jet; condensation; load calculation; simulation; experimental study

目 錄

摘 要 1
Abstract III
第1章 緒論 1
1.1 課題的研究背景 1
1.2 國內(nèi)、外研究現(xiàn)狀 2
1.2.1 輻射供冷防結(jié)露問題的研究 2
1.2.2 輻射供冷技術(shù)的研究 3
1.2.3 射流領(lǐng)域的研究 4
1.3 本文的研究內(nèi)容與方法 5
第2章 輻射供冷與貼附射流復(fù)合空調(diào)系統(tǒng)理論分析 7
2.1 輻射供冷與貼附射流復(fù)合空調(diào)系統(tǒng)簡介 7
2.1.1 輻射供冷與貼附射流復(fù)合空調(diào)系統(tǒng)工作原理 7
2.1.2 輻射供冷與貼附射流復(fù)合空調(diào)系統(tǒng)末端形式 7
2.2 貼附射流理論 9
2.2.1 射流的分類 9
2.2.2 自由紊動射流 9
2.2.3 豎壁貼附射流 11
2.3貼附射流與常規(guī)送風(fēng)下冷輻射板供冷量對比 14
2.4 本章小結(jié) 14
第3章 實(shí)驗(yàn)房間參數(shù)以及數(shù)學(xué)物理模型的確定 15
3.1 室內(nèi)冷負(fù)荷的計(jì)算 15
3.1.1 得熱與冷負(fù)荷 15
3.1.2負(fù)荷計(jì)算結(jié)果 16
3.1.3 新風(fēng)量的確定 17
3.2 實(shí)驗(yàn)房間數(shù)學(xué)模型的建立 18
3.2.1 CFD軟件簡介 18
3.2.2 控制方程 19
3.2.3 湍流模型 20
3.2.4 輻射模型 21
3.3 房間物理模型的建立 22
3.3.1 空間幾何模型 22
3.3.2 模型的物理參數(shù) 23
3.3.3 網(wǎng)格的劃分 23
3.3.4 壓力速度耦合 24
3.3.5 收斂判斷依據(jù) 24
3.4 本章小結(jié) 24
第4章 輻射供冷與貼附射流復(fù)合空調(diào)系統(tǒng)數(shù)值模擬 25
4.1 貼附射流送風(fēng)參數(shù)的確定 25
4.1.1 冷輻射表面結(jié)露可能性的比較分析 26
4.1.2 室內(nèi)流場的比較分析 27
4.2 輻射供冷與貼附射流復(fù)合空調(diào)系統(tǒng)數(shù)值計(jì)算結(jié)果分析..