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This paper describes the results of experimental investigations of heat transfer during the condensation of the homogenous R134a refrigerant and zeotropic mixtures R404A, R407C and R410A in pipe minichannels with internal diameters 0.31–3.30 mm. The values of the local and average heat transfer coefficient throughout the range of changes in the vapor quality 1–0 were determined. Based on the obtained...
A theoretical and experimental analysis of propagation of disturbances and determination of propagation velocity in a two-phase refrigeration medium has been made. During investigations on the experimental facility, a step change of the pressure in flow of a refrigerant R404A was induced. The introduced disturbance propagated with a finite velocity depending on the parameters of the medium and, more...
Introduction of new environmentally-friendly refrigerants in refrigerating and air-conditioning systems requires theoretical and experimental research. The paper describes experimental investigations into heat exchange and flow resistance during boiling flow freon R314a in tube coils -- the process that occurs in typical fan air coolers. The obtained results allow the determination of the heat transfer...
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