Results 61 to 70 of about 129 (110)

R513A condensation heat transfer inside tubes: Microfin tube vs. smooth tube

International Journal of Heat and Mass Transfer, 2020
Abstract The imminent phase-down of the common refrigerant R134a is calling for lower GWP alternatives. Real alternatives must have a lower global warming impact and they should be not flammable. In this context, R513A (azeotropic mixture made of R1234yf and R134a at 56% and 44% by mass) has been proposed as alternative to R134a due to its similar ...
Andrea Diani, Luisa Rossetto
exaly   +3 more sources

R513A flow boiling heat transfer inside horizontal smooth tube and microfin tube

International Journal of Refrigeration, 2019
Abstract This paper presents experimental results for R513A flow boiling inside a 3.5 mm ID horizontal smooth tube and inside a 3.4 mm ID horizontal microfin tube. R513A is an azeotropic mixture made of R1234yf and R134a (56% and 44% in mass), and it is proposed as a direct substitute of the common R134a.
Andrea Diani, Luisa Rossetto
exaly   +3 more sources

Condensation heat transfer of R-134a inside a microfin tube with different tube inclinations

International Journal of Heat and Mass Transfer, 2007
Abstract Experimental heat transfer studies during condensation of pure R-134a vapor inside a single microfin tube have been carried out. The microfin tube has been provided with different tube inclination angles of the direction of fluid flow from horizontal, α . The data are acquired for seven different tube inclinations, α , in a range of −90 to
Ravi Kumar, M A Akhavan-Behabadi
exaly   +2 more sources

Evaporation heat transfer of R-134a inside a microfin tube with different tube inclinations

Experimental Thermal and Fluid Science, 2011
Abstract An experimental investigation has been carried out to study the heat transfer characteristics during evaporation of R-134a inside a single helical microfin tube. The microfin tube has been provided with different tube inclination angles of the direction of fluid flow from horizontal, α. The experiments were performed for seven different tube
M A Akhavan-Behabadi
exaly   +2 more sources

R1233zd(E) flow boiling inside a 4.3 mm ID microfin tube

International Journal of Refrigeration, 2018
Abstract In this paper some new experimental data collected during R1233zd(E), a new hydrochlorofluoroolefin molecule, flow boiling inside a microfin tube having an inner diameter equal to 4.3 mm are reported. The tube was made of copper, set up in horizontal position and electrically heated from the bottom.
Giovanni Longo, Giulia Righetti, Simone Mancin   +2 more
exaly   +2 more sources

Visual study of flow patterns during condensation inside a microfin tube with different tube inclinations

International Communications in Heat and Mass Transfer, 2011
Abstract In this paper, flow patterns and their transitions for refrigerant R-134a condensing in a microfin tube are visually observed and analyzed. The microfin tube has been provided with different tube inclination angles of the direction of fluid flow from horizontal, α. The experiments were performed for seven different tube inclinations, α, in a
M A Akhavan-Behabadi
exaly   +2 more sources

Experimental study of R600a boiling in microfin tube

International Journal of Thermal Sciences
Zahraa Kareem Yasser
exaly   +2 more sources

Condensation of refrigerants in horizontal microfin tubes

International Journal of Refrigeration, 2003
Abstract This paper presents a comprehensive comparison of eight previously proposed correlations with available experimental data for the frictional pressure drop during condensation of refrigerants in helically grooved, horizontal microfin tubes.
H.S. Wang, J.W. Rose, H. Honda
openaire   +1 more source

Condensation of R407C in a horizontal microfin tube

International Journal of Refrigeration, 2005
Abstract This paper describes experimental results that show the effects of mass velocity and condensation temperature difference on the local heat transfer characteristics during condensation of R407C in a horizontal microfin tube. The experiments were performed at the saturation temperature of 40 °C, the refrigerant mass velocity of 50, 100, 200 ...
H. Honda, A.T. Wijayanta, N. Takata
openaire   +1 more source

A Simple Correlation for Horizontal Microfin Tube Convective Boiling

ASME Journal of Heat and Mass Transfer, 2022
AbstractThis paper presents a simple correlation containing nine dimensionless parameters to predict the local convective boiling heat transfer within a microfin tube that was developed from a dataset that included a wide range of refrigerants, flow conditions, and hydraulic diameters.
M. A. Kedzierski, L. Lin
openaire   +1 more source