An Experimental investigation was conducted to demonstrate the effect of material on the heat transfer characteristics of R410A during evaporation inside three horizontal plain tubes with the same inner diameter of 6mm, and they are made of copper, aluminum and stainless, respectively. The variation of vapor quality for test section were kept at 0.2-0.9, and mass velocities varied from 100 kg m^-2^s^-1^ to 400 kg m^-2^s^-1^. A series of single-phase and repetitive experiments was conducted to verify the accuracy and reliability of the test rig firstly. The results for evaporation have shown that the plain aluminum tube performs the best for all tested mass velocities, while the copper one has a worse thermal performance up to 20%. A more specific comparison of their surface characteristics was conducted by electron microscope to exclude the effect of roughness. Several different correlations were employed to predict the present data and their predictive ability were compared. A new model was proposed to account for the effect of material and surface roughness on the heat transfer performance during saturated flow boiling of R410A. For condensation, little difference was found among tree tested tubes, which means that the material and roughness may have little effect on the heat transfer performance during condensation.


Effects of Material on the Heat Transfer of R410a During Condensation and Evaporation

Division / Sponsors: 
Heat Transfer Division (HTD), Fluids Engineering Division (FED)

Heat Transfer Summer Conference
Paper Proceedings: https://asmedigitalcollection.asme.org/HT/HT2020/volume/83709

18th International Conference on Nanochannels, Microchannels, and Minichannels
Paper Proceedings: https://asmedigitalcollection.asme.org/ICNMM/ICNMM2020/volume/83693

Fluids Engineering Division Summer Meeting
Paper Proceedings: https://asmedigitalcollection.asme.org/FEDSM/FEDSM2020/volume/83716

HT-ICNMM2020 - Virtual Conference, SHTC - Virtual Conference, FEDSM2020 - Virtual Conference

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