Vybor formul dlya rascheta koeffitsienta teplootdachi pri kipenii freonov vnutri trub

The paper presents the results of the overview of literature data on the presence of calculation dependences that allow determining average heat transfer coefficients along the surface and local heat transfer coefficients at refrigerants boiling inside tubes. The calculation dependences to determine heat transfer coefficients at boiling inside tubes for different conditions of flow are cited. The calculations carried out and the comparison of calculated and experimental data resulted in the choice of the formulae for calculation of a heat transfer coefficient when a singlephase liquid flows inside tubes as well as for calculation of a heat transfer coefficient in the zone of a developed bubble boiling of a refrigerant in a large volume. The formulae allow calculating thermal characteristics of evaporators at refrigerants boiling inside tubes more accurately. The use of calculation dependences cited gives the possibility to reduce the time for searching and actualization of formulae that suit more for calculation of thermal characteristics of evaporators at refrigerants boiling inside tubes.

внутритрубное кипение, фреон, коэффициент теплоотдачи, кипение в большом объеме, режимы течения, испаритель