本文關(guān)鍵詞：貼附射流與輻射冷頂板復(fù)合空調(diào)系統(tǒng)的性能研究　出處：《湖南大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 輻射冷頂板 貼附射流 獨(dú)立新風(fēng) 結(jié)露 室內(nèi)熱環(huán)境

【摘要】：輻射冷頂板空調(diào)系統(tǒng)作為一種近幾年在國內(nèi)開始應(yīng)用的新型空調(diào)方式,具有節(jié)能、舒適性強(qiáng)、污染性小等優(yōu)點(diǎn),十分切合當(dāng)今人們正密切關(guān)注的環(huán)保、節(jié)能以及室內(nèi)環(huán)境質(zhì)量問題。但同時(shí)我們也注意到,它存在著易結(jié)露、供冷能力有限、新風(fēng)量不足等缺點(diǎn),制約了其推廣應(yīng)用。本文的研究重點(diǎn)即在于研究輻射冷頂板系統(tǒng)與獨(dú)立新風(fēng)貼附射流復(fù)合運(yùn)行后防止輻射冷頂板結(jié)露的效果,以及該復(fù)合空調(diào)的性能參數(shù)設(shè)置不同時(shí)對(duì)室內(nèi)熱環(huán)境的影響。本文首先對(duì)采用貼附射流送風(fēng)方式防止輻射冷頂板系統(tǒng)結(jié)露情況的效果進(jìn)行了研究。通過搭建試驗(yàn)臺(tái),將輻射冷頂板系統(tǒng)與獨(dú)立新風(fēng)貼附射流系統(tǒng)復(fù)合運(yùn)行,并將之與不采用貼附射流送風(fēng)方式的輻射冷頂板+獨(dú)立新風(fēng)系統(tǒng)進(jìn)行了簡單的對(duì)比實(shí)驗(yàn)。實(shí)驗(yàn)發(fā)現(xiàn),相較于后者,采用貼附射流送風(fēng)方式確實(shí)能夠有效防止輻射冷頂板結(jié)露現(xiàn)象的發(fā)生。與此同時(shí),由于存在貼附射流的對(duì)流影響,還能提升輻射冷頂板空調(diào)系統(tǒng)的供冷能力。之后,本文又通過Fluent軟件對(duì)該復(fù)合系統(tǒng)在實(shí)際房間中應(yīng)用的情況進(jìn)行了CFD模擬,通過分析室內(nèi)空氣溫度場、速度場以及輻射冷頂板附近的相對(duì)濕度分布情況發(fā)現(xiàn),雖然在本例中輻射冷頂板不會(huì)結(jié)露,且室內(nèi)熱舒適性滿足人體需求,但實(shí)際上起作用的是獨(dú)立新風(fēng)系統(tǒng),而貼附射流由于新風(fēng)量小、風(fēng)速低的原因并未有效形成,這種獨(dú)立新風(fēng)的作用效果存在著條件限制。如果冷負(fù)荷需求增大,輻射冷頂板溫度降低,則仍有結(jié)露風(fēng)險(xiǎn)。該模擬結(jié)果解釋了實(shí)驗(yàn)對(duì)比情況的產(chǎn)生原因,也反映了采用貼附射流送風(fēng)方式對(duì)于輻射冷頂板防結(jié)露的重要性。因此,針對(duì)實(shí)驗(yàn)及模擬的結(jié)果,本文繼續(xù)對(duì)上例進(jìn)行CFD模擬研究,提出了各種不同的貼附射流設(shè)置條件,并就貼附射流送風(fēng)形式設(shè)置不同所造成的射流貼附情況、輻射冷頂板結(jié)露情況及室內(nèi)熱環(huán)境情況進(jìn)行了對(duì)比分析,最后提出了貼附射流設(shè)置方案,可在送風(fēng)量有限的情況下有效形成貼附射流,防止輻射冷頂板空調(diào)系統(tǒng)結(jié)露,并滿足室內(nèi)熱舒適性要求,為該復(fù)合空調(diào)系統(tǒng)在實(shí)際工程上的應(yīng)用提供了一定參考。
[Abstract]:Radiant cooling ceiling air-conditioning system as a new type of air conditioning, the beginning of the last few years in domestic application has the advantages of energy saving, high comfort, low pollution, very fit today's people are paying close attention to environmental protection, energy saving and indoor environmental quality problems. But at the same time, we also noticed that it exists for condensation. Cooling capacity is limited, disadvantages of lack of fresh air volume, restricts its application. The emphasis of this paper is research on radiant cooling ceiling system with independent air jets after the operation to prevent cold radiation composite roof condensation effect, and the performance parameters of the composite air conditioner on the indoor thermal environment effect. Firstly, the attached jet ventilation to prevent condensation cold radiation was studied. The effect of roof system by building test platform, the radiant cooling ceiling system with independent air attached jet system The composite operation, and the roof radiant cooling + independent fresh air system and the attached jet ventilation compared with the simple experiment. The experimental results showed that, compared with the latter, the attached jet ventilation can effectively prevent the occurrence of roof radiant cooling condensation phenomenon. At the same time, due to the presence of convection effect attached jet, but also enhance the radiant cooling ceiling air-conditioning system cooling capacity. After this, through CFD simulation application of the composite system in the actual room in the case of the Fluent software, through the analysis of indoor air temperature field, velocity field and radiation near the cold roof relative humidity distribution was found, although in this in cases of radiant cooling roof not dew, and the indoor thermal comfort to meet human needs, but in fact it is the independent fresh air system, and the attached jet due to the new air volume, low wind speed and the reasons No valid form, the effect of the existence of independent fresh air conditions. If the cooling load demand increases, roof radiant cooling temperature is reduced, but there is still the risk of condensation. The simulation results explain the causes of the situation of experiment, also reflects the attached importance to the shooting flow wind type radiant cooling and condensation prevention of roof. Therefore, according to the experimental and simulation results, this paper proceed CFD simulation of the above example, put forward different attached jet setting conditions, jet and air the form produced by setting different attached jet attachment condition, radiant cooling and condensation roof indoor thermal environment were analyzed. Finally, the attached jet setting scheme in the air under the condition of limited effective form attached jet, prevent the radiant cooling ceiling air-conditioning system of condensation, and meet the indoor thermal comfort requirements, for the complex The combined air conditioning system provides a certain reference for the application of the actual engineering.

【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)】：TU831.3

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