本文選題：蒸發(fā)式冷凝器 + 參數(shù)設計��； 參考：《哈爾濱商業(yè)大學》2017年碩士論文

【摘要】：制冷行業(yè)的能耗在我國全年能耗中占很大的比例。在制冷行業(yè)中,設備的節(jié)能與否直接關系水力和電力的資源浪費問題,因此制冷系統(tǒng)的節(jié)能問題迫在眉睫。蒸發(fā)式冷凝器是制冷系統(tǒng)中換熱效率較高的換熱器,具有高效節(jié)能、結構緊湊等優(yōu)點,在制冷行業(yè)中備受關注,近幾年對蒸發(fā)式冷凝器的研究越來越深入。本文依據節(jié)能減排的基本要求,對蒸發(fā)式冷凝器進行分析計算,結合實際工程應用,對其優(yōu)化改進,為蒸發(fā)式冷凝器改進和節(jié)能優(yōu)化提供理論依據。主要工作內容如下:(1)根據蒸發(fā)式冷凝器內部流體之間的傳熱過程,以工程應用為例,設計出所需設備結構型式,確定主要設備的選型,并對蒸發(fā)式冷凝器相關參數(shù)進行計算;(2)通過數(shù)值模擬,得出換熱盤管管壁的溫度變化,進而求出管壁平均溫度,為下一步計算打下基礎;(3)采用數(shù)值實驗研究的方法研究了蒸發(fā)式冷凝器換熱情況。重點研究了叉排和順排兩種管束結構形式以及相對位置關系對蒸發(fā)器內部流動和換熱的影響。數(shù)值實驗研究的結果表明,叉排管束形式更有利于蒸發(fā)式冷凝器內管外流體與制冷劑之間的換熱,降低制冷劑溫度。同時,獲得最佳管束間距;(4)分析了影響蒸發(fā)式冷凝器的工作性能的因素。提出在蒸發(fā)式冷凝器內增加預熱結構降低水垢形成的改進方案。預熱部分采用翅片管形式,根據所設計蒸發(fā)式冷凝器的結構、用水量等參數(shù),計算了預熱部分翅片管長度等參數(shù)。
[Abstract]:The energy consumption of refrigeration industry accounts for a large proportion of the annual energy consumption in China. In the refrigeration industry, the energy saving of the equipment is directly related to the waste of water and electricity resources, so the energy saving problem of the refrigeration system is urgent. Evaporative condenser is a heat exchanger with high heat transfer efficiency in refrigeration system, which has the advantages of high efficiency and energy saving, compact structure and so on. It has attracted much attention in refrigeration industry. In recent years, the research on evaporative condenser has been more and more in-depth. According to the basic requirements of energy saving and emission reduction, the evaporative condenser is analyzed and calculated in this paper. Combined with the practical engineering application, the evaporative condenser is optimized and improved, which provides a theoretical basis for the improvement of evaporative condenser and the optimization of energy saving. The main work is as follows: (1) according to the heat transfer process between the internal fluids of the evaporative condenser, taking the engineering application as an example, the structure type of the required equipment is designed and the type selection of the main equipment is determined. The relevant parameters of evaporative condenser are calculated. By numerical simulation, the temperature change of the tube wall of the heat transfer coil tube is obtained, and the average temperature of the tube wall is obtained. The heat transfer of evaporative condenser is studied by numerical experiment. The influence of two kinds of bundles structure and relative position on the internal flow and heat transfer of evaporator was studied. The results of numerical experiments show that the cross-row tube bundles are more favorable to the heat transfer between the internal and external fluid and the refrigerant in the evaporative condenser and reduce the refrigerant temperature. At the same time, the optimal bundle spacing is obtained. The factors affecting the working performance of evaporative condenser are analyzed. An improved scheme of adding preheating structure to evaporative condenser to reduce the formation of scale is put forward. The preheating part is in the form of finned tube. According to the structure and water consumption of the evaporative condenser, the parameters such as the length of the preheated partial fin tube are calculated.
【學位授予單位】：哈爾濱商業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB657;TK172

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