【作者】 彭博；

【导师】 潘新祥；

【作者基本信息】 大连海事大学 ， 轮机工程， 2012， 硕士

【摘要】 随着自然资源的匮乏,全球正面临着越来越严重的能源危机。高效传热系统在提高能源利用率方面有着重要的作用,可广泛应用于航空航天、船舶、制冷等各类工业领域。在传热系统中,蒸发器是不可缺少的重要组成部分,因此,高效蒸发器的研究具有重要的经济效益和社会价值。本文研发了一种新型的细薄膜蒸发器,利用细薄膜蒸发强化传热的特点提高蒸发器的效率。所研制蒸发器的蒸发管采用外部翅片、内部微沟槽的结构,通过微沟槽辅助形成细薄膜,提高传热系数。本文搭建了一套实验系统,以去离子水为工质,通过调节进液量、加热功率、系统压力等方法测试所研制蒸发器的传热性能。为了验证细薄膜蒸发器的性能,本文制作了一个相同规格的普通光管蒸发器,在相同工况条件下对两种蒸发器进行对比实验研究。通过对比研究,本文所研发的细薄膜蒸发器在各实验工况下的传热性能均优于普通光管蒸发器,其中在蒸发温度60℃工况时的功率可达750W,约是同工况下普通光管蒸发器的1.5倍。此外,工质在细薄膜蒸发器中蒸发段较长,整体过热度较小,蒸发较为充分。实验结果表明,采用微沟槽结构的细薄膜蒸发器能有效地提高传热效率,改善蒸发器的传热性能。本文中的研究有助于进一步了解细薄膜强化传热的机理,对高效蒸发器的设计研究有一定的指导意义。更多还原

【Abstract】 As the storage of the energy and natural resources becoming less and less, the whole world is facing significantly serious energy crisis. For high-efficiency heat transfer systems, which have a high energy utilization rate, can be applied for various kinds of industrial productions as well as many fields such as aerospace, shipping industry and etc. And the evaporator is one important part of this system, thus, it is of great economic benefit and social value for researching high-efficiency evaporator.An evaporator utilizing thin film evaporation is fabricated for improving the efficiency of the evaporator. Fins are installing the outside of the copper pipes of which have miro-grooves on the inside wall. The grooves are helpful for forming thin films and enhancing heat performance, making a higher heat transfer efficiency. An experiment system is set up for testing the thin film evaporator by adjusting the fluid amount, heating power and system pressure, with deionized water as the working fluid. A similar regular evaporator made of smooth copper pipes is also fabricated and tested in order to compare the heat performance with the former evaporator. It turns out that thin film evaporator has a better performance than regular evaporator at almost every working conditions, and the heat power reach to750W at the working temperature of60℃,almost1.5times the power of regular evaporator. And it is also found that working fluid evaporates more sufficiently and has a lower superheat than regular evaporator. So, this thin film evaporator using micro-groove can enhance the heat transfer efficiency and improve the heat transfer performance. This research is helpful for a better understanding of the mechanism of evaporating thin film, and also instructive to the design of high efficiency evaporator.更多还原