本文選題：熱工學(xué)　切入點(diǎn)：蒸發(fā)式冷凝器　出處：《天津商業(yè)大學(xué)》2014年碩士論文　論文類(lèi)型：學(xué)位論文

【摘要】：隨著冷凍冷藏業(yè)的快速發(fā)展，勢(shì)必增加能源的消耗，能源日漸短缺已經(jīng)成為不爭(zhēng)的事實(shí)，近年霧霾頻現(xiàn)也使人們面對(duì)著巨大的挑戰(zhàn)，因此節(jié)能環(huán)保型設(shè)備的開(kāi)發(fā)和應(yīng)用具有重要的意義。 蒸發(fā)式冷凝器是一種高效的換熱設(shè)備，因其具有節(jié)能、節(jié)水、占地少等優(yōu)點(diǎn)，，被廣泛應(yīng)用于制冷行業(yè)。蒸發(fā)式冷凝器傳熱性能的研究對(duì)提高蒸發(fā)式冷凝制冷系統(tǒng)具有重要的意義。蒸發(fā)式冷凝器傳熱過(guò)程十分復(fù)雜，需進(jìn)行詳細(xì)的研究。 為研究蒸發(fā)式冷凝器性能，搭建蒸發(fā)式冷凝器制冷實(shí)驗(yàn)臺(tái)。通過(guò)理論分析和實(shí)驗(yàn)研究相結(jié)合的方法，研究逆流式蒸發(fā)式冷凝器的傳熱傳質(zhì)性能，主要研究迎面風(fēng)速和噴淋密度對(duì)傳熱傳質(zhì)的影響，并在同一實(shí)驗(yàn)條件下對(duì)比了順流和逆流兩種形式的蒸發(fā)式冷凝器的傳熱傳質(zhì)性能，得到如下結(jié)論： 1）風(fēng)速和噴淋密度是影響蒸發(fā)式冷凝器的兩大關(guān)鍵因素。總傳熱系數(shù)隨著風(fēng)速的增大而增大然后趨于平緩，隨著噴淋密度的增大而增大。風(fēng)速主要影響空氣對(duì)流傳熱系數(shù)，噴淋密度影響水膜傳熱系數(shù)。 2）對(duì)于結(jié)構(gòu)給定的蒸發(fā)式冷凝器單位傳熱面積存在最佳風(fēng)量和水量。本實(shí)驗(yàn)臺(tái)所在測(cè)試條件下，逆流式蒸發(fā)式冷凝器最佳單位傳熱面積風(fēng)量和水量為277.4m3/(h·m2)和0.63kg/(h·m2)，對(duì)應(yīng)的迎面風(fēng)速和最佳噴淋密度分別為2.96m/s和0.057kg/（m·s）；順流式蒸發(fā)式冷凝器最佳單位傳熱面積風(fēng)量和水量為307.4m3/(h·m2)和0.75kg/(h·m2)，對(duì)應(yīng)的迎面風(fēng)速和最佳噴淋密度分別為3.28m/s和0.068kg/（m·s），對(duì)蒸發(fā)式冷凝器的開(kāi)發(fā)和設(shè)計(jì)有一定的指導(dǎo)意義。 3）逆流式蒸發(fā)式冷凝器比順流式蒸發(fā)式冷凝器具有優(yōu)越的傳熱性能，在實(shí)驗(yàn)條件下，傳熱系數(shù)前者比后者高17.2%。逆流式蒸發(fā)式冷凝器風(fēng)速不宜過(guò)高，易產(chǎn)生液泛現(xiàn)象，影響傳熱性能。 4）設(shè)計(jì)過(guò)程中不僅考慮蒸發(fā)式冷凝器的傳熱性能，而且要考慮整個(gè)系統(tǒng)的性能，使EER達(dá)到最佳值。逆流式蒸發(fā)式冷凝器比順流式蒸發(fā)式冷凝器高近8.2%。 5）蒸發(fā)式冷凝器主要利用蒸發(fā)潛熱吸收熱量，具有很高的傳熱系數(shù)。對(duì)比干工況和正常工況，前者的總傳熱系數(shù)約為后者的1/10左右。 研究結(jié)果對(duì)蒸發(fā)式冷凝器的研究和開(kāi)發(fā)具有一定的指導(dǎo)意義，且對(duì)逆流式蒸發(fā)式冷凝器的實(shí)驗(yàn)研究，對(duì)以后研究蒸發(fā)式冷凝器傳熱傳質(zhì)性能，提供了可靠的參考數(shù)據(jù)。
[Abstract]:With the rapid development of frozen cold storage industry, it is bound to increase energy consumption, energy shortage has become an indisputable fact, in recent years, haze frequency also makes people face a huge challenge. Therefore, the development and application of energy-saving and environmental-friendly equipment is of great significance. Evaporative condenser is an efficient heat exchanger, which has the advantages of saving energy, saving water and occupying less land. It is widely used in refrigeration industry. The study of heat transfer performance of evaporative condenser is of great significance to improve the evaporative condenser refrigeration system. The heat transfer process of evaporative condenser is very complex and needs to be studied in detail. In order to study the performance of evaporative condenser, an experimental bench of evaporative condenser was built. The heat and mass transfer performance of countercurrent evaporative condenser was studied by combining theoretical analysis with experimental research. The effects of wind speed and spray density on heat and mass transfer are studied. The heat and mass transfer performance of the evaporative condenser is compared under the same experimental conditions, and the conclusions are as follows:. 1) Wind speed and spray density are the two key factors affecting evaporative condenser. The total heat transfer coefficient increases with the increase of wind speed and then tends to be gentle, and increases with the increase of spray density. The wind speed mainly affects the convection heat transfer coefficient of air. Spray density affects the heat transfer coefficient of water film. 2) for the unit heat transfer area of the evaporative condenser with a given structure, there exists the optimum air volume and water quantity. The best unit heat transfer area air volume and water volume of countercurrent evaporative condenser are 277.4 m3 / h 路m2) and 0.63 kg / m ~ (-1) h 路m ~ 2 路m ~ (2), corresponding to the forward wind speed and optimum spray density are 2.96 m / s and 0.057 kg / m 路s ~ (-1), respectively, and the optimum air volume and water volume per unit heat transfer area of the downstream evaporative condenser are 307.4 m ~ 3 / h 路m ~ 2 路m ~ (2). The corresponding wind speed and optimum spray density are 3.28 m / s and 0.068 kg / m 路s-1 respectively, which are of certain guiding significance to the development and design of evaporative condenser. 3) the countercurrent evaporative condenser has better heat transfer performance than the downstream evaporative condenser. Under the experimental conditions, the heat transfer coefficient of the former is 17.2% higher than that of the latter. Affect heat transfer performance. 4) not only the heat transfer performance of evaporative condenser is considered in the design process, but also the performance of the whole system should be considered to make the EER reach the optimum value. The countercurrent evaporative condenser is nearly 8.2 higher than the downstream evaporative condenser. 5) the evaporative condenser mainly absorbs heat by evaporative latent heat and has a high heat transfer coefficient, and the total heat transfer coefficient of the former is about 1/10 of that of the latter. The results are of certain significance for the research and development of evaporative condenser and provide reliable reference data for the experimental study of countercurrent evaporative condenser and for the later study of heat and mass transfer performance of evaporative condenser.
【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】：2014
【分類(lèi)號(hào)】：TB657;TK124

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 邱慶剛;陳金波;;水平管降膜蒸發(fā)器管外液膜的數(shù)值模擬[J];動(dòng)力工程學(xué)報(bào);2011年05期

2 王鐵軍,吳昊,劉向農(nóng),唐景春;蒸發(fā)式冷凝器經(jīng)濟(jì)技術(shù)分析[J];低溫與超導(dǎo);2003年02期

3 朱冬生;沈家龍;唐廣棟;蔣翔;歐陽(yáng)惕;;水分布對(duì)蒸發(fā)式冷凝器傳熱傳質(zhì)的影響[J];工程熱物理學(xué)報(bào);2007年01期

4 朱冬生;沈家龍;蔣翔;徐麗;歐陽(yáng)惕;;蒸發(fā)式冷凝器管外水膜傳熱性能實(shí)驗(yàn)研究[J];高校化學(xué)工程學(xué)報(bào);2007年01期

5 尹慶珍;王國(guó)華;韓建會(huì);郄麗娟;蔣艷霞;;我國(guó)蔬菜低溫冷庫(kù)的發(fā)展現(xiàn)狀及展望[J];河北農(nóng)業(yè)科學(xué);2008年08期

6 路慧霞;馬曉建;;水平管降膜蒸發(fā)傳熱的實(shí)驗(yàn)研究進(jìn)展[J];化工機(jī)械;2008年02期

7 崔海亭,王振輝,汪云;ATC蒸發(fā)式冷凝器在制冷工程中的應(yīng)用[J];河北化工;1998年03期

8 劉德輝,梁珍海,李榮錦;蒸發(fā)研究的概況與進(jìn)展[J];江蘇林業(yè)科技;1998年04期

9 段滿清;鄒聲華;李剛;;蒸發(fā)冷卻技術(shù)的應(yīng)用現(xiàn)狀與展望[J];建筑熱能通風(fēng)空調(diào);2007年04期

10 吳治將;朱冬生;蔣翔;涂愛(ài)民;;蒸發(fā)式冷凝器的應(yīng)用與研究[J];暖通空調(diào);2007年08期

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