微通道光管换热器研究
发布时间：2019-06-25 16:24
【摘要】：微通道换热器是一种借助特殊微加工技术以固体基质制造的可用于进行热传递的三维结构单元。当前关于微通道换热器的确切定义,比较通行、直观的分类是由Mehen-dale.s.s提出的按其水力当量直径的尺寸来划分。通常将水力当量直径小于l mm的换热器称为微通道换热器。本论文在ANSYS仿真的基础上,通过对已有产品进行建模,首先对单根管与传统大管径进行温度场与流场的模拟对比,准确找出微通道换热器在换热方面的优势,再分别对微通道单根管、三根管、双排六根管的情况进行温度场以及流场模拟,分析管与管排列方式对对流换热的影响,最后结合已有试验装置进行试验验证。结果显示:冷凝器对流换热系数试验与模拟的结果始终保持在20%的误差以内,而蒸发器的对流换热系数试验与模拟的结果由于受到冷凝水这部分热阻的影响,误差控制在30%以内,由上可以得出模拟结果具有一定的参考价值。对微通道换热器进行变工况分析,通过选择不同冷凝风机风量模拟出微通道的对流换热系数,通过计算得出COP峰值,找出最佳状态点,并将其定为最佳工作状态点。通过以上的分析计算得出结论:COP最大值点取值为7.4785,根据风机电机输入功率计算式反推得出,当迎面风速为3.39m/s时,此时制冷系统的COP达到一个峰值。最后,分别选取该微通道换热器与传统换热器做两器进行系统性能试验可以得出:在总体积方面,微通道换热器室内机和室外机占用体积相比传统换热器(带翅片)分别减少了97.5%和98.7%,而就铜管所消耗的体积来讲,微通道换热器相比传统换热器蒸发器和冷凝器分别减小55.8%和23.9%,从经济角度出发,蒸发器和冷凝器经济花费分别减少了23.22元和19.44元。由此可见,该微通道换热器在工程应用中经济效益与体积优势明显。
[Abstract]:The microchannel heat exchanger is a three-dimensional structural unit that can be used for heat transfer in a solid matrix by means of special micromachining techniques. The exact definition of the microchannel heat exchanger is currently more accessible and the visual classification is divided by the size of its hydraulic equivalent diameter as proposed by Mehen-dale. s. s. A heat exchanger having a hydraulic equivalent diameter of less than l mm is commonly referred to as a microchannel heat exchanger. On the basis of the ANSYS simulation, by modeling the existing products, the simulation and comparison of the temperature field and the flow field of the single pipe and the traditional large pipe diameter are compared, the advantages of the micro-channel heat exchanger in the heat exchange are accurately found, and the single pipe and the three pipes of the micro-channel are respectively used for the micro-channel heat exchanger, The temperature field and the flow field simulation are carried out in the case of the two rows of six tubes, and the effect of the tube and tube arrangement on the convection heat transfer is analyzed. Finally, the experimental verification is carried out in combination with the existing test device. The results show that the results of the experiment and simulation of the convection heat transfer coefficient of the condenser are always within 20% of the error, and the experimental and simulation results of the convection heat transfer coefficient of the evaporator are within 30% due to the influence of the thermal resistance of the condensed water. It can be concluded that the simulation results have a certain reference value. The variable working condition of the microchannel heat exchanger is analyzed, and the convection heat transfer coefficient of the microchannel is simulated by selecting the air volume of different condensing fans, and the COP peak value is calculated, the optimal state point is found, and the optimal working state point is determined. Through the above analysis, it is concluded that the maximum value of COP is 7.4785. According to the calculation formula of the input power of the fan motor, the COP of the refrigeration system reaches a peak when the head-on wind speed is 3.39 m/ s. in that end, the system performance test of the micro-channel heat exchanger and the conventional heat exchanger is respectively selected to obtain the conclusion that, in terms of the total volume, the occupied volume of the micro-channel heat exchanger indoor machine and the outdoor unit is reduced by 97.5% and 98.7%, respectively, compared with the occupied volume of the outdoor unit, In terms of the volume consumed by the copper tube, the micro-channel heat exchanger is 55.8% and 23.9%, respectively, compared with the traditional heat exchanger evaporator and the condenser, and the economic cost of the evaporator and the condenser is reduced by 23.22 and 19.44 yuan respectively from the economic point of view. It can be seen that the micro-channel heat exchanger has obvious economic benefit and volume advantage in the engineering application.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK172
本文编号：2505824
[Abstract]:The microchannel heat exchanger is a three-dimensional structural unit that can be used for heat transfer in a solid matrix by means of special micromachining techniques. The exact definition of the microchannel heat exchanger is currently more accessible and the visual classification is divided by the size of its hydraulic equivalent diameter as proposed by Mehen-dale. s. s. A heat exchanger having a hydraulic equivalent diameter of less than l mm is commonly referred to as a microchannel heat exchanger. On the basis of the ANSYS simulation, by modeling the existing products, the simulation and comparison of the temperature field and the flow field of the single pipe and the traditional large pipe diameter are compared, the advantages of the micro-channel heat exchanger in the heat exchange are accurately found, and the single pipe and the three pipes of the micro-channel are respectively used for the micro-channel heat exchanger, The temperature field and the flow field simulation are carried out in the case of the two rows of six tubes, and the effect of the tube and tube arrangement on the convection heat transfer is analyzed. Finally, the experimental verification is carried out in combination with the existing test device. The results show that the results of the experiment and simulation of the convection heat transfer coefficient of the condenser are always within 20% of the error, and the experimental and simulation results of the convection heat transfer coefficient of the evaporator are within 30% due to the influence of the thermal resistance of the condensed water. It can be concluded that the simulation results have a certain reference value. The variable working condition of the microchannel heat exchanger is analyzed, and the convection heat transfer coefficient of the microchannel is simulated by selecting the air volume of different condensing fans, and the COP peak value is calculated, the optimal state point is found, and the optimal working state point is determined. Through the above analysis, it is concluded that the maximum value of COP is 7.4785. According to the calculation formula of the input power of the fan motor, the COP of the refrigeration system reaches a peak when the head-on wind speed is 3.39 m/ s. in that end, the system performance test of the micro-channel heat exchanger and the conventional heat exchanger is respectively selected to obtain the conclusion that, in terms of the total volume, the occupied volume of the micro-channel heat exchanger indoor machine and the outdoor unit is reduced by 97.5% and 98.7%, respectively, compared with the occupied volume of the outdoor unit, In terms of the volume consumed by the copper tube, the micro-channel heat exchanger is 55.8% and 23.9%, respectively, compared with the traditional heat exchanger evaporator and the condenser, and the economic cost of the evaporator and the condenser is reduced by 23.22 and 19.44 yuan respectively from the economic point of view. It can be seen that the micro-channel heat exchanger has obvious economic benefit and volume advantage in the engineering application.
【学位授予单位】：南京航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TK172
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