A study on the influence of gravity to condensation in micro-channels by experimental method
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hungdm@hcmute.edu.vnKeywords:
Gravity, microchannel, pressure drop, performance index, heat transfer coefficientAbstract
The performance index and the heat transfer coefficient are the basic characteristics for evaluating the efficiency of a heat exchanger. These quantities depend on many factors including the physical parameters of working fluid, heat dissipation, materials and gravitational force, etc. The objective of this study was to assess the effect of gravity force to the performance index and heat transfer coefficient of microchannel condensers. The study was conducted on a microchannel condenser in two horizontal and vertical cases while the ambient temperature and steam parameters remained constant. The results showed the difference in the pressure drop, the performance index and the heat transfer coefficient in the two horizontal and vertical channels when the inlet steam rate varied from 0.01 [g/s] to 0.07 [g/s]. The results revealed that vertical micro-channels had smaller pressure drop and higher performance index than horizontal ones. The maximum heat transfer coefficient of 5556 [W/m2K] was achieved in this study.
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