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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：百叶窗式微通道和微通道蒸发器的数值研究-研究新型制冷剂混合物的热工-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：航空航天，汽车和HVAC＆R行业对更紧凑，更高效的换热器的需求导致了利用百叶窗式微通道或微通道管的换热器的发展。在这项研究中，开发了有限体积的稳态蒸发器模型，该模型包括矩形微型通道和带有百叶窗式翅片和集管的微通道管，并在Matlab中进行了验证。该模型为用户提供了从多个已发布的相关性中进行选择的选项，以计算每个控制区内的空气侧和制冷剂侧传热以及压降。使用Wu和Webb（2002），Yun等人的实验数据进行模型验证。 （2007），Qi等。 （2009）和Shi等。 （2011）。这四项研究的预测和实际制冷量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，在此验证中，检查的制冷能力范围相当大（即325 W至40,850 W），并且模拟低估了制冷能力，其频率与高估了大致相同的频率。然后，该模型用于研究两种三元制冷剂混合物的热工液压性能，即R-125 / R-32 / R-161（34％/ 15％/ 51％）与R-22和R-125 / R-143a / R-161（45％/ 40％/ 15％）对R-404A。这些制冷剂混合物的物理性质使用REFPROP 9.0进行了估算，并在可能的情况下通过实际的实验性质数据进行了验证。这些模拟使用了60、80和100 kg / m〜2s的恒定质量通量条件。发现含有R-125 / R-32 / R-161（34％/ 15％/ 51％）的模拟蒸发器的单位表面积传热速率比R-22的传热速率高58％以上。相同的质量流量为1.7 mm ＜D_h ＜3.7 mm。在D_h的这一范围内，还模拟了该混合物的制冷剂侧压降，发现与R-22在60 kg / m〜2s时的压降相当，仅略高于R-22在80和100 kg时的压降。 / m〜2s。

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