Results 111 to 120 of about 822 (152)

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

Convective Condensation Inside Horizontal Smooth and Microfin Tubes

Journal of Heat Transfer, 2014
An experimental investigation was performed for convective condensation of R410A inside one smooth tube (3.78 mm, inner diameter) and six microfin tubes (4.54, 4.6 and 8.98 mm, fin root diameter) of different geometries for mass fluxes ranging from 99 to 603 kg m−2s−1.
Zan Wu, Bengt Sundén, Lei Wang, Wei Li
openaire   +1 more source

Pressure Drop During Refrigerant Condensation Inside Horizontal Smooth, Helical Microfin, and Herringbone Microfin Tubes

Journal of Heat Transfer, 2004
This paper presents a study of pressure drops during condensation inside a smooth, an 18-deg helical microfin, and a herringbone microfin tube. Measurements were conducted with refrigerant flowing through the tube of a concentric heat exchanger, with water flowing in a counterflow direction in the annulus.
Jonathan A. Olivier, Leon Liebenberg, Mark A. Kedzierski, Josua P. Meyer   +3 more
openaire   +1 more source

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, MohammadAli Akhavan Behabadi
exaly   +2 more sources

Condensation flow patterns inside plain and microfin tubes: A review

International Journal of Refrigeration, 2013
Nowadays, plain and microfin tubes are largely used in refrigeration and air conditioning industries for condensation inside macroscale tubes. The mechanisms of condensation heat transfer and pressure drop are tightly linked with the prevailing two-phase flow regime, but not much evidence about the effect of microfins on the condensation flow patterns ...
DORETTI, LUCA, ZILIO, CLAUDIO, MANCIN, SIMONE, CAVALLINI, ALBERTO   +3 more
openaire   +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
MohammadAli Akhavan Behabadi
exaly   +2 more sources

Low GWP refrigerants condensation inside a 2.4 mm ID microfin tube

International Journal of Refrigeration, 2018
Abstract This paper explores the possible use of R1234yf and R1234ze(E) during condensation inside a microfin tube with an inner diameter at the fin tip of 2.4 mm as replacement of R134a. Having thermodynamic properties close to those of R134a, R1234yf and R1234ze(E) are some of its possible replacements for air conditioning and refrigeration systems.
Andrea Diani, Alberto Cavallini, Luisa Rossetto   +2 more
exaly   +3 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.
Giulia Righetti, Giovanni A Longo, Claudio Zilio   +2 more
exaly   +2 more sources

Numerical simulation of R410A condensation in horizontal microfin tubes

Numerical Heat Transfer, Part A: Applications, 2017
ABSTRACTThe heat transfer characteristics of condensation for R410A inside horizontal microfin tubes with 0° and 18° helical angles were investigated numerically. The numerical data fit well with the experimental results and with the empirical correlations.
Jingzhi Zhang, Wei Li, W. J. Minkowycz
openaire   +1 more source