CO2 condensation heat transfer coefficient and pressure drop in a mini-channel space condenser

CO2 condensation heat transfer coefficient and pressure drop in a mini-channel space condenser
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微通道空间冷凝器中CO2冷凝传热系数和压降

DOI:
10.1016/j.expthermflusci.2012.07.007
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发表时间:
2013
期刊:
Experimental Thermal and Fluid Science, Volume 44, January 2013, Pages 356-363
影响因子:
--
通讯作者:
T.X.Li
T.X.Li
中科院分区:
其他
文献类型:
--
作者:
T.X.Li

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研究了CO2在微通道冷凝器中的流动凝结换热特性。冷凝器由七根并联的管子组成,它们通过导热胶与两块铝基板热连接。在饱和温度为-5 °C ~ 15°C,质量流速分别为180、360和540 kg/(m2 s),平均蒸汽干度为0.2 ~ 0.8的条件下,得到了CO2冷凝换热系数为1700 ~ 4500 W/(m2 K)。将实测的传热系数与建立的关联式预测的传热系数进行了比较,发现Thome的关联式适用于所研究的冷凝器,误差小于30%。对冷凝器压降的测量结果进行了讨论,发现压降随质量流速和干度的增大而增大,随饱和温度的增大而减小。
We present the flow condensation heat transfer characteristics of CO2in a mini-channel condenser. The condenser consists of seven tubes in parallel, which are thermally connected to two aluminium base-plates by using thermal glue. At saturation temperatures ranging from −5°C to 15°C, with mass velocities of 180, 360 and 540kg/(m2s), respectively, and average vapour qualities from 0.2 to 0.8, we obtained the CO2condensation heat transfer coefficients, ranging from 1700 to 4500W/(m2K). We compared the measured heat transfer coefficients with those predicted by the established correlations, and found that Thome’s was applicable to the condenser under investigation, with deviation less than 30%. We also discussed the measured pressure drop over the condenser, which increased with the mass velocity and the vapour quality, but decreased with the saturation temperature.
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