本文關(guān)鍵詞： 新型輻射板 供冷能力 傳熱模型 優(yōu)化　出處：《湖南大學》2015年碩士論文　論文類型：學位論文

【摘要】：在很多國家,特別是在歐洲,冷輻射吊頂是被普遍應(yīng)用的一種供冷形式,這種系統(tǒng)通常被用于辦公建筑、學校建筑、醫(yī)院建筑等一些級別較高的建筑當中。研究人員在將這種形式的系統(tǒng)與傳統(tǒng)的空調(diào)系統(tǒng)進行比較之后發(fā)現(xiàn)其具有很多優(yōu)點,例如:能提供更為衛(wèi)生的生活環(huán)境且舒適性更好、系統(tǒng)運行過程中的噪聲更低、安裝及檢修時更為方便等,這些優(yōu)點也更符合現(xiàn)代人需求一種更為舒適、健康、節(jié)能的空調(diào)系統(tǒng)的目標。珠海某公司在原有輻射板的基礎(chǔ)上進行了改進,生產(chǎn)出了一種新型輻射板,這種新型輻射板的結(jié)構(gòu)簡單、價格不高,并且還能有效解決輻射板凝露的問題,這種新型輻射板的出現(xiàn)使輻射供冷在國內(nèi)的推廣前景更為廣闊。但是此類新型輻射板也存在一些設(shè)計上的不足,如空氣腔的存在造成的供冷能力的減弱。而本文就將通過建立輻射板的傳熱模型,對此類輻射板結(jié)構(gòu)中的銅管外徑、管壁厚度、管間距、輻射發(fā)射率和塑料網(wǎng)格支撐,以及輻射板運行時的冷水溫度和冷水流速進行分析,找到對輻射板供冷能力影響較大的參數(shù),對輻射板的結(jié)構(gòu)設(shè)計進行優(yōu)化,以達到提高輻射板供冷能力的目的。通過對選定范圍內(nèi)的參數(shù)的分析發(fā)現(xiàn):水溫、管間距和輻射發(fā)射率對輻射板供冷能力的影響最大,塑料支撐高度和管外徑對輻射板供冷能力的影響較大,而管壁厚度和冷水流速對輻射板供冷能力幾乎沒有影響;此類新型輻射板的供冷能力仍有很大的提升潛力,若對輻射板的結(jié)構(gòu)和運行參數(shù)進行優(yōu)化,可以使其供冷能力提高40%~50%左右。同時,本文利用肋片傳熱的原理,得到了一個適合估算此類輻射板供冷能力的簡便計算式,為輻射板的設(shè)計提供一個相對便捷的途徑,這可以作為設(shè)計人員的一個參考。
[Abstract]:In many countries, especially in Europe, cold radiation ceiling is a common form of cooling, this system is usually used in office buildings, school buildings. In some of the higher-grade buildings, such as hospital buildings, researchers have found that this form of systems has many advantages compared with traditional air-conditioning systems. For example: can provide a more hygienic living environment and better comfort, the system operation process noise is lower, installation and maintenance more convenient, these advantages are more in line with the needs of modern people a more comfortable, healthy. The goal of energy-saving air conditioning system. A certain company in Zhuhai has improved on the basis of the original radiation plate, and has produced a new type of radiation plate, which has simple structure and low price. And also can effectively solve the problem of radiation plate condensation, the emergence of this new radiation plate radiation cooling in the domestic promotion prospects more broad, but this new radiation plate also has some design deficiencies. For example, the cooling capacity of the air chamber is weakened because of the existence of the air cavity. In this paper, the external diameter, the thickness of the tube wall and the distance between the tubes in the structure of the radiating plate will be calculated by establishing the heat transfer model of the radiating plate. The radiation emissivity and plastic mesh support, as well as the cold water temperature and velocity of cold water during the operation of the radiating plate are analyzed, and the parameters which have a great influence on the cooling capacity of the radiating plate are found, and the structural design of the radiating plate is optimized. In order to improve the cooling capacity of the radiating plate, it is found that the water temperature, the distance between tubes and the radiation emissivity have the greatest influence on the cooling capacity of the radiating plate through the analysis of the parameters in the selected range. The plastic supporting height and the outer diameter of the pipe have great influence on the cooling capacity of the radiating plate, while the thickness of the pipe wall and the flow rate of cold water have little effect on the cooling capacity of the radiating plate. The cooling capacity of this kind of new radiating plate still has great potentiality. If the structure and operation parameters of the radiating plate are optimized, the cooling capacity of the plate can be increased by about 40%. At the same time, the cooling capacity of the plate can be improved by 50% or so. Based on the principle of fin heat transfer, a convenient formula for estimating the cooling capacity of the radiating plate is obtained, which provides a relatively convenient way for the design of the radiating plate. This can be used as a reference for designers.
【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：1468934