Abstract
Short state-of-the-art on the enhancement of condensation heat transfer
techniques by means of condensate drainage is presented in this paper. The
electrohydrodynamic (EHD) technique is suitable for dielectric media used
in refrigeration, organic Rankine cycles and heat pump devices. The
electric field is commonly generated in the case of horizontal tubes by
means of a rod-type electrode or mesh electrodes. Authors proposed two
geometries in the presented own experimental investigations. The first one
was an electrode placed just beneath the tube bottom and the second one
consisted of a horizontal finned tube with a double electrode placed
beneath the tube. The experimental investigations of these two
configurations for condensation of refrigerant R-123 have been
accomplished. The obtained results confirmed that the application of the
EHD technique for the investigated tube and electrode arrangement caused
significant increase in heat transfer coefficient. The condensation
enhancement depends both on the geometry of the electrode system and on
the applied voltage.
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