本文選題：輻射供冷 + 防結(jié)露�。� 參考：《天津商業(yè)大學(xué)》2017年碩士論文

【摘要】：輻射空調(diào)系統(tǒng)起源于歐洲,輻射供冷空調(diào)系統(tǒng)是在房間地板、吊頂?shù)葒o(hù)結(jié)構(gòu)內(nèi)嵌入冷水管網(wǎng)形成冷輻射面,通過(guò)冷輻射面與室內(nèi)其他環(huán)境形成以輻射換熱為主并伴隨對(duì)流換熱的空調(diào)系統(tǒng)。輻射供冷空調(diào)系統(tǒng)以其良好的節(jié)能性和舒適性而被認(rèn)為是目前最具應(yīng)用潛力的空調(diào)形式之一。但輻射供冷空調(diào)系統(tǒng)由于冷輻射面溫度較低,當(dāng)空氣濕度較大時(shí),易在冷輻射面上形成結(jié)露現(xiàn)象,不僅影響系統(tǒng)正常運(yùn)行,而且影響房間衛(wèi)生。因此結(jié)露現(xiàn)象的發(fā)生成為限制輻射供冷空調(diào)系統(tǒng)廣泛推廣應(yīng)用的主要問(wèn)題。結(jié)露是由于輻射供冷空調(diào)系統(tǒng)冷輻射面表面溫度低于周圍空氣露點(diǎn)溫度而引起的水蒸氣凝結(jié)現(xiàn)象。因此,要研究輻射供冷空調(diào)系統(tǒng)的防結(jié)露問(wèn)題,掌握輻射供冷空調(diào)系統(tǒng)輻射板表面溫度的動(dòng)態(tài)變化和輻射板周圍空氣的露點(diǎn)溫度動(dòng)態(tài)變化至關(guān)重要。本課題是在課題組已經(jīng)完成輻射供冷空調(diào)系統(tǒng)輻射板表面溫度動(dòng)態(tài)變化規(guī)律的基礎(chǔ)上,對(duì)輻射供冷空調(diào)系統(tǒng)輻射板貼附層空氣露點(diǎn)溫度與各影響因子的關(guān)系、以及在室內(nèi)人員發(fā)生變化時(shí)貼附層空氣露點(diǎn)溫度動(dòng)態(tài)變化的研究,在輻射板表面溫度與貼附層空氣動(dòng)態(tài)變化規(guī)律結(jié)果基礎(chǔ)上,研究一種防結(jié)露最佳安全溫差預(yù)測(cè)模型。首先通過(guò)實(shí)驗(yàn)研究了室內(nèi)熱源變化時(shí)對(duì)貼附層空氣干球溫度的變化,進(jìn)而分析了室內(nèi)熱源對(duì)貼附層空氣露點(diǎn)溫度的影響。接著對(duì)室內(nèi)人員增加時(shí),貼附層空氣露點(diǎn)溫度的動(dòng)態(tài)變化進(jìn)行了分析研究。在實(shí)驗(yàn)研究的基礎(chǔ)上,對(duì)實(shí)驗(yàn)房間建立物理模型,運(yùn)用FLUENT軟件對(duì)模型進(jìn)行模擬研究,作為實(shí)驗(yàn)研究的補(bǔ)充和擴(kuò)展,得出輻射供冷空調(diào)系統(tǒng)貼附層空氣露點(diǎn)溫度與各影響因子的關(guān)系,并通過(guò)線性回歸分析得出適用于多種工況的貼附層空氣露點(diǎn)溫度與各影響因子通用關(guān)系式。最后聯(lián)立板溫與露點(diǎn)溫度關(guān)系式,通過(guò)求解獲得一種輻射供冷空調(diào)系統(tǒng)防結(jié)露控制的最佳安全溫差預(yù)測(cè)模型。本課題的研究主要有以下結(jié)論:(1)與溫度相關(guān)的影響因子對(duì)輻射供冷空調(diào)系統(tǒng)貼附層空氣露點(diǎn)溫度的影響較小,可以忽略不計(jì),如板表面溫度、內(nèi)圍護(hù)結(jié)構(gòu)表面溫度、室內(nèi)熱源等。而與室內(nèi)空氣含濕量分布相關(guān)的影響因子對(duì)貼附層空氣露點(diǎn)溫度影響較大,包括濕源強(qiáng)度、濕源距貼附層的距離等;(2)室內(nèi)人員增加時(shí),貼附層空氣露點(diǎn)溫度先以負(fù)指數(shù)形式增大,隨后趨于穩(wěn)定。室內(nèi)人員增加不同、濕源距貼附層距離不同,貼附層空氣露點(diǎn)溫度增大的速率和最后穩(wěn)定時(shí)達(dá)到的溫度值不同。濕源強(qiáng)度越大、濕源距貼附層越近時(shí),貼附層空氣露點(diǎn)溫度增加越快且最終穩(wěn)定時(shí)達(dá)到溫度值越高。(3)盡管人員增加時(shí)室內(nèi)貼附層空氣露點(diǎn)溫度增大,但與提高供水溫度后輻射板表面溫度升高速率相比仍增加緩慢,只有當(dāng)室內(nèi)人員增加較多,即濕源強(qiáng)度足夠大時(shí),板溫增加速率與露點(diǎn)溫度增加速率才接近,研究得出了此種情況下的防結(jié)露最佳安全溫差預(yù)測(cè)模型。(4)對(duì)室內(nèi)人員增加后貼附層空氣露點(diǎn)溫度變化和提高供水溫度、降低供水流量后板表面溫度變化曲線聯(lián)立分析可以看出,對(duì)不同室內(nèi)濕源增加工況和不同防結(jié)露調(diào)節(jié)工況,研究最佳安全溫差的關(guān)鍵是要分析輻射板表面溫度變化斜率和貼附層空氣露點(diǎn)溫度變化斜率。另外,降低供水流量對(duì)輻射供冷空調(diào)系統(tǒng)防結(jié)露的效果較小,提高供水溫度和關(guān)閉供水可以有效防止輻射供冷空調(diào)系統(tǒng)結(jié)露的發(fā)生,并且通過(guò)二者曲線變化可以尋找某工況下防結(jié)露的最佳調(diào)節(jié)時(shí)間和最佳安全溫差。本研究將輻射供冷空調(diào)系統(tǒng)輻射板表面溫度動(dòng)態(tài)變化和貼附層空氣露點(diǎn)溫度動(dòng)態(tài)變化聯(lián)立分析,得出了不同工況下不同調(diào)節(jié)方式下的最佳調(diào)節(jié)時(shí)刻和最佳安全溫差。本課題結(jié)果對(duì)輻射供冷空調(diào)系統(tǒng)的推廣應(yīng)用提供理論支持,研究方法也為輻射供冷空調(diào)系統(tǒng)防結(jié)露提供參考。
[Abstract]:The radiation air conditioning system originated in Europe. The radiation cooling air conditioning system is embedded in the room floor, the ceiling and other enclosure structures to form cold radiation surface, and form the air conditioning system with radiation heat transfer and convection heat transfer through the cold radiant surface and other indoor environment. The radiation cooling air conditioning system has good energy saving and comfort. It is considered to be one of the most potential air conditioning forms at present. But the radiation cooling air conditioning system, because of the low temperature of the cold radiant surface, is easy to form condensation on the cold radiation surface when the air humidity is large, which not only affects the normal operation of the system, but also affects the health of the room. This condensation phenomenon becomes the limitation of the radiation cooling air. The condensation is due to the condensation phenomenon caused by the surface temperature of the cold radiation surface of the radiation cooling air conditioning system which is lower than the ambient air dew point temperature. Therefore, it is necessary to study the anti condensation problem of the radiation cooling air conditioning system and master the dynamic change of the surface temperature of the radiation plate on the radiation cooling air conditioning system. The dynamic change of the dew point temperature of the air around the radiant plate is very important. On the basis of the dynamic change of the surface temperature of the radiant plate on the radiation cooling air conditioning system, this topic is on the relationship between the air dew point temperature of the radiation plate attached layer and the influence of the influence factors on the radiation plate and the changes in the indoor personnel. The dynamic change of air dew point temperature in the attached layer is studied. On the basis of the results of the surface temperature of the radiant plate and the dynamic change rule of the attached layer air, a prediction model for the optimum safety temperature difference is studied. First, the change of the air dry ball temperature in the attached layer is studied by the experiment, and the indoor heat source is analyzed. The influence of the air dew point temperature on the attached layer. Then the dynamic changes of the air dew point temperature of the attached layer are analyzed and studied. On the basis of the experimental study, the physical model of the experimental room is established and the model is simulated by FLUENT software. As a supplement and expansion of the experimental research, the radiation cooling air space is obtained. The relationship between the air dew point temperature of the attached layer and the influence factors, and through the linear regression analysis, the general relation between the air dew point temperature of the attached layer and the influence factors is obtained. Finally, the formula of the relationship between the temperature and the dew point temperature of the joint plate is obtained, and the best way to prevent the condensation control of the radiation cooling air conditioning system is obtained by solving the formula. The main conclusions of this study are as follows: (1) the effect of temperature related factors on the air dew point temperature of the attached layer of the radiation cooling air conditioning system is small, which can be ignored, such as the surface temperature of the plate, the surface temperature of the inner enclosure structure, the indoor heat source and so on, and the influence on the indoor air moisture content distribution. Factors have great influence on the air dew point temperature of the attached layer, including the strength of the wet source and the distance from the attachment layer of the wet source. (2) when the indoor personnel increase, the air dew point temperature of the attached layer increases first in the negative index form, and then tends to be stable. At the end of the stability, the temperature values are different. The greater the strength of the wet source, the closer the wet source spacing is, the faster the air dew point temperature in the attached layer increases and the final stability reaches the higher temperature. (3) although the air dew point temperature of the indoor attached layer increases while the personnel increase, it is still compared with the increase of the surface temperature of the radiant plate after the increase of the water supply temperature. Increase slowly, only when the indoor personnel increase more, that is, when the strength of the wet source is large enough, the increase rate of the plate temperature and the rate of dew point temperature increase is close. (4) the temperature variation of the air dew point in the attached layer and the water supply temperature are increased and the water supply is reduced. The joint analysis of the surface temperature variation curve of the flow back plate shows that the key to the study of the optimum safety temperature difference is to analyze the slope of the surface temperature change and the air dew point temperature change slope of the attached layer. The effect of anti condensation is small. Improving the water supply temperature and closing the water supply can effectively prevent the condensation of the radiation cooling air conditioning system, and the optimum adjustment time and the best safety temperature difference can be found through the change of the two curve. The dynamic change of the air dew point temperature of the attached layer is analyzed, and the optimum adjustment time and the best safety temperature difference are obtained under different operating conditions. The results of this paper provide theoretical support for the popularization and application of the radiation cooling air conditioning system, and the research method also provides reference for the anti condensation of the radiation cooling air conditioning system.

【學(xué)位授予單位】：天津商業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TU831.3

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本文編號(hào)：1795473