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首页> 外文会议>International refrigeration and air conditioning conference at Purdue >A Numerical Study of Minichannel and MicroChannel Evaporators with Louvered Fins- Investigating the Thermal-Hydraulic Performance of New Refrigerant Mixtures
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A Numerical Study of Minichannel and MicroChannel Evaporators with Louvered Fins- Investigating the Thermal-Hydraulic Performance of New Refrigerant Mixtures

机译：百叶窗翅片的迷你槽和微通道蒸发器的数值研究研究新制冷剂混合物的热液压性能

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The need for more compact and more efficient heat exchangers in the aerospace, automotive, and HVAC&R industries has led to the development of heat exchangers that utilize minichannel or microchannel tubes coupled with louvered fins. In this study, a finite volume, steady-state evaporator model that includes rectangular minichannel and microchannel tubes with louvered fins and headers was developed and validated in Matlab. The model provides the user with the option to select from multiple published correlations for calculating the air-side and refrigerant-side heat transfer and pressure drop within each control volume. Model validation was performed using the experimental data presented in Wu and Webb (2002), Yun et al. (2007), Qi et al. (2009) and Shi et al. (2011). The average error between the predicted and actual cooling capacity for these four studies was 8.54%, 12.62%, 4.94% and 7.93%, respectively, with an average deviation of 8.5% (n = 29). It should also be noted that the range of examined cooling capacities in this validation was fairly large (i.e. 325 W to 40,850 W), and the simulation under-predicted the cooling capacity with approximately the same frequency as it over-predicted it. The model was then used to explore the thermal-hydraulic performance of two ternary refrigerant mixtures-namely, R-125/R-32/R-161 (34%/15%/51%) versus R-22 and R-125/R-143a/R-161 (45%/40%/15%) versus R-404A. The physical properties of these refrigerant mixtures were estimated using REFPROP 9.0 and (where possible) verified by actual experimental property data. Constant mass flux conditions of 60, 80 and 100 kg/m~2s were used for these simulations. It was found that the heat transfer rate per surface area of the simulated evaporator containing R-125/R-32/R-161 (34%/15%/51%) was more than 58% higher than that of R-22 for the same mass flux for 1.7 mm ＜ D_h ＜ 3.7 mm. The refrigerant-side pressure drop of this mixture was also simulated over this range of D_h and found to be comparable to the pressure drop for R-22 at 60 kg/m~2s and only slightly higher than R-22 at 80 and 100 kg/m~2s.
机译：在航空航天，汽车和HVAC＆R产业中需要更紧凑和更高效的热交换器导致了利用百万烷基或微通道管与百叶窗的微通道管的热交换器的开发。在该研究中，在Matlab中开发并验证包括矩形鳍和带头部的矩形迷你通道和微通道管的有限体积，稳态蒸发器模型。该模型提供了用户选择从多个公开的相关性选择，以计算每个控制体积内的空气侧和制冷剂侧传热和压降。使用吴和韦伯（2002），Yun等人的实验数据进行了模型验证。 （2007），齐等人。 （2009）和Shi等人。 （2011）。这四项研究的预测和实际冷却能力之间的平均误差分别为8.54％，12.62％，4.94％和7.93％，平均偏差为8.5％（n = 29）。还应注意，该验证中检查的冷却能力范围相当大（即325W至40,850 W），并且模拟在预测其上预测的频率大致相同的频率下降。然后使用该模型来探讨两个三元制冷剂混合物的热液压性能 - 即，R-125 / R-32 / R-161（34％/ 15％/ 51％）与R-22和R-125 / R-143A / R-161（45％/ 40％/ 15％）与R-404a。使用REFPROP 9.0估计这些制冷剂混合物的物理性质，并通过实际的实验性能数据验证。使用60,80和100kg / m〜2s的恒定质量助熔剂条件用于这些模拟。发现含有R-125 / R-32 / R-161的模拟蒸发器的每个表面面积的传热速率比R-22高出58％以上的58％以上的58％（34％/ 15％）相同的质量磁通量为1.7 mm

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