This paper presents experimental local heat transfer coefficient and pressure drop results obtained during the evaporation of the zeotropic mixture R407C (R32-R125-R134a, 23/25/52 % in weight). The test section was a smooth, horizontal, stainless steel tube (6 turn ID, 6 in length) uniformly heated by Joule effect. The effects of mass flux, heat flux and evaporating pressure on the heat transfer coefficients have been investigated. The experimental tests have been performed with a refrigerant mass flux of 200 and 355 kg/m(2)s varying the heat flux within the range 8.0-16.9 kW/m(2) and the evaporating pressure from 3.5 up to 10.0 bar.
|Titolo:||Evaporation of refrigerants in a smooth horizontal tube: prediction of R407C heat transfer coefficients and pressure drops|
|Data di pubblicazione:||2005|
|Appare nelle tipologie:||4.1 Contributo in Atti di convegno|