Open AccessAn experimental study of heat transfer and pressure drop during flow boiling of R134a and R236fa in a microchannel system
Author(s) -
А. С. Шамирзаев
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1683/2/022074
Subject(s) - subcooling , nucleate boiling , refrigerant , boiling , microchannel , thermodynamics , pressure drop , heat flux , bubble , flow boiling , materials science , heat transfer , critical heat flux , superheating , mechanics , chemistry , heat exchanger , physics
An experimental study was made of heat transfer and pressure drop during the boiling of R134a and R236fa refrigerants in a system with two slotted microchannels. A copper block with two microchannels 2.05 mm wide, 0.4 mm deep, and 16 mm long was used as an experimental test section. The mass velocity varied from 500 to 2000 kg/m 2 s, the initial subcooling was from 40 °C to 0 °C. Data analysis showed that, when the flux of R236fa refrigerant becomes saturated, nucleate bubble boiling is absent. In the case of R134a saturated flow boiling, suppression of nucleate bubble boiling was observed with heat flux increasing.