微通道换热器在家用分体空调的降充注应用研究

发布时间：2018-03-09 19:03

本文选题：家用空调　切入点：微通道换热器　出处：《上海交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：根据《蒙特利尔议定书》的规定,第5条款国家应在2013年冻结HCFC的生产和消费量到基线水平,并且在2015年消减基线水平的10%。我国房间空调器行业是HCFC物质的主要消费领域之一。因此,家用空调行业HCFC制冷剂替代工作迫在眉睫。碳氢制冷剂的环境友好性是公认的,不仅对臭氧没有破坏,对气候的负面影响几乎为零,且有较好的节能潜力,但碳氢制冷剂的应用也面临着可燃性的限制和挑战。而解决的关键问题主要在于降低空调系统制冷剂充注量。而换热器中所含制冷剂占整个系统的绝大部分,因此,利用微通道换热器替代原管片式换热器是减小系统充注量的重要方法之一。同时,国家对空调行业的能效标准的提高,以及国际铜价的不断上涨,使得对微通道在家用空调中应用研究进一步增多。本文的主要内容和成果如下:一、建立微通道换热器模型,对微通道换热器翅片高度、翅片间距、开窗角度、翅片厚度等关键参数对换热器性能的影响进行了分析,初步确立了微通道换热器关键参数的最优值,对后续的样件制作及实验进行指导;二、利用所建立模型,对微通道冷凝器减小系统充注量的方法进行研究。在3HP柜机系统里,通过采用减小扁管宽度的方法,将系统R290充注量可降低到470g,与原机相比,其制冷量降低了8.9%,系统COP则提高了14.8%;在1.5HP分体式空调系统,通过将集流管内径减小到11mm,可将系统R290制冷剂充注量降低到280g,;采用扁管扭曲技术,进一步将集流管内径减小到6mm,系统系能达到原机的基础上,R22充注量可降低到380g,相应的R290充注量可降低到190g左右。三、对微通道蒸发器的翅片间距对其排水性能及系统整体性能进行了研究。当翅片间距为1.4mm时,系统性能达到最优;系统的R22制冷剂的充注量由原来的2200g降到1850g左右,降低15.9%;系统制冷时,COP提高了2.2%;制热模式下,系统制热量提高了3.9%,COP提高了11.2%;四、制作了室外侧翅片凸出排水手工样件,并对其在额定制冷制热工况下的性能进行测试。结果表明,样件能够使系统在制冷模式下,取得较好的性能,但在制热模式下,仍存在排水问题,其制作工艺以及百叶窗翅片夹角是其排水不畅的主要原因。
[Abstract]:Under the Montreal Protocol, Article 5 countries are required to freeze production and consumption of HCFC to baseline levels by 2013, In 2015, the domestic air conditioner industry is one of the main consumption areas of HCFC substances. Therefore, the replacement of HCFC refrigerant in household air conditioning industry is urgent. The environmental friendliness of hydrocarbon refrigerants is recognized. Not only does it have no damage to ozone, but the negative impact on the climate is almost zero, and it has the potential to save energy. However, the application of hydrocarbon refrigerant also faces the limitation and challenge of flammability. The key problem to be solved is to reduce the refrigerant charge in air conditioning system. The use of microchannel heat exchangers to replace the original tube heat exchangers is one of the important ways to reduce the charge of the system. At the same time, the national energy efficiency standards for the air conditioning industry and the rising international copper prices are increasing. The main contents and achievements of this paper are as follows: first, the fin height, fin spacing, window angle of microchannel heat exchanger are established. The influence of finned thickness and other key parameters on the performance of the heat exchanger is analyzed, and the optimum value of the key parameters of the microchannel heat exchanger is preliminarily established. In the 3HP cabinet system, by reducing the width of the flat tube, the charge of R290 can be reduced to 470g, compared with the original system. Its refrigerating capacity is reduced by 8.9, and the system COP is increased by 14.80.In 1.5HP separate air conditioning system, by reducing the inner diameter of the collector tube to 11mm, the charge of the system R290 refrigerant can be reduced to 280gg, and the flat tube twist technique is used. Further reducing the inner diameter of the collector to 6 mm, the system system can reach the original machine and the charge of R22 can be reduced to 380 g, and the corresponding charge of R290 can be reduced to about 190g. The finned spacing of microchannel evaporator has been studied on its drainage performance and the overall performance of the system. When the fin spacing is 1.4 mm, the system performance is optimal, and the charge flux of R22 refrigerant is reduced from 2200g to 1850g. The cop of the system is increased by 2.2 when the system is cooled; the heating capacity of the system is increased by 3.9and the cop is increased by 11.2in the heating mode; fourthly, the manual specimen of outside-fin protruding drainage is made, and its performance under the rated cooling and heating condition is tested. The sample can make the system get better performance in the refrigeration mode, but in the heating mode, there still exists the problem of drainage. The main reason of the drainage is the manufacturing technology and the angle of the louver fin.
【学位授予单位】：上海交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU83

【相似文献】