Results 221 to 230 of about 15,890 (250)

Modelling of condensation pressure drop for R134a and R134a-lubricant-mixtures in multiport flat tubes

International Journal of Refrigeration, 2020
Abstract This paper presents the results of an experimental investigation on pressure drop characteristics for R134a and R134a-lubricant mixtures in multiport flat tubes (MPFT). An experimental facility has been set up, carefully validated and used to determine the pressure drop value in the two-phase flow regime inside extruded MPFT with hydraulic ...
Paul Knipper, Jonas Arnsberg, Dirk Bertsche, Ronald Gneiting, Thomas Wetzel   +4 more
openaire   +1 more source

Thermophysical properties of refrigerant R134a

International Journal of Refrigeration, 1992
Abstract Experimental results of measurements of the thermodynamic and transport properties of refrigerant R134a are presented for the temperature range 240–400 K and pressures up to 89 bar. The thermal properties of the saturated refrigerant were also determined. The results from this study showed that the dependence of viscosity on temperature near
G.K Lavrenchenko, G.Ya Ruvinskij, S.V Iljushenko, V.V Kanaev   +3 more
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Experimental densities for compressed R134a

International Journal of Refrigeration, 1992
Abstract This paper reports densities of compressed R134a (1,1,1,2-tetrafluoroethane) determined by using a contiuously weighed pycnometer at 20 K intervals between 180 and 380 K at pressures from slightly greater than the vapour pressure to 70 MPa. The results are accurate to within ±0.1%. Saturated liquid densities derived by extrapolation from the
H Hou, J.C Holste, B.E Gammon, K.N Marsh
openaire   +1 more source

R134a and various mixtures of R22/R134a as an alternative to R22 in vapour compression heat pumps

Energy Conversion and Management, 2004
Abstract The performance of an air to water vapor compression heat pump has been investigated experimentally. The main purpose of this study was to investigate the possibilities of using R134a as a working fluid to replace R22 for vapor compression heat pumps.
KARAGÖZ, Şendoğan, ÇOMAKLI, Ömer, Ozyurt, O., YILMAZ, Mehmet   +3 more
openaire   +3 more sources

EXPERIMENTAL STUDY ON R1234yf/R134a MIXTURE (R513a) AS R134a REPLACEMENT IN HEAT PIPES

Journal of Enhanced Heat Transfer
We compare the efficacy of R513a, a refrigerant blend comprising hydrofluorocarbon/hydrofluoroolefin, with R134a, a commonplace refrigerant having a higher global warming potential, in the context of low-temperature heat pipe applications. Tests were conducted considering both helically grooved heat pipes and also smooth heat pipes (i.e., thermosyphons)
Vivek Kumar, Raihanul Kabir, Zachary Shannon, Prashant R. Waghmare, Morris R. Flynn   +4 more
openaire   +1 more source

Transport properties of 1,1,1,2-tetrafluoroethane (R134a)

International Journal of Thermophysics, 1993
New equations for the thermal conductivity and the viscosity of R134a that are valid in a wide range of pressures and temperatures are presented. They were obtained through a theoretically based, critical evaluation of the available experimental data, which showed considerable inconsistencies between data sets, in particular in the vapor phase.
R. Krauss, J. Luettmer-Strathmann, J. V. Sengers, K. Stephan   +3 more
openaire   +1 more source

Microemulsion Formation in 1,1,1,2-Tetrafluoroethane (R134a)

Langmuir, 2003
Water solubilization by anionic perfluorinated surfactants has been examined in the condensed phase of the hydrofluorocarbon (HFC) gas 1,1,1,2-tetrafluoroethane (R134a) in the temperature range 15-55 °C and to pressures of 500 bar. The surfactant di(1H,1H,5H-octafluoro-n-pentyl) sodium sulfosuccinate (di-HCF4) forms stable water-in-R134a microemulsions
David C. Steytler, Matthew Thorpe, Julian Eastoe, Audrey Dupont, Richard K. Heenan   +4 more
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Research on flammability of R290/R134a, R600a/R134a and R600a/R290 refrigerant mixtures

International Journal of Refrigeration, 2022
Dehua Cai, Zian Hao, Hao Xu, Guogeng He
openaire   +1 more source

R134a Refrigerant Automotive Air-Conditioning Hose

2017
<div class="section abstract"> <div class="htmlview paragraph">This SAE Standard covers hose and hose assemblies intended for conducting liquid and gaseous R134a refrigerant in automotive air-conditioning systems. The hose shall be designed to minimize permeation of R134a refrigerant, contamination of the system, and to be functional over
openaire   +2 more sources

Performance Comparison among Heat Pump Water Heaters Working with R32, R134a and the Mixture of R32/R134a

Advanced Materials Research, 2012
A general air-source heat pump water heater originally designed to work with R134a was reconstructed as experimental rig for performance studies on systems using different refrigerants including R32, R134a and the mixture of R32/R134a which mass ratio is 1:5.
De Feng Ding, Shi Jie Liu, Chao Yu Zheng, Wen Sheng Yu, Wu Chen   +4 more
openaire   +1 more source