Results 51 to 60 of about 15,890 (250)
Two-phase heat transfer in small passages and microfinned surfaces - Fundamentals and applications [PDF]
, 2006 Micro channels and internally finned tubes are increasingly being utilized in the evaporators and condensers of refrigeration systems. The adoption of such geometries in the development of micro-cooling systems is first discussed in this paper.
Al-Dadah, RK, Karayiannis, TG, Rose, J
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Asia-Pacific Journal of Chemical Engineering, Volume 21, Issue 1, January/February 2026.ABSTRACT This study investigates binary zeotropic mixtures of R744 (CO₂) blended with eco‐friendly refrigerants for medium‐high temperature heat pumps, comparing them with conventional R744/R134a systems. All mixtures meet 60–80 K temperature lift requirements under low‐temperature conditions. A genetic algorithm optimized system parameters using fixed
Lingling Sun +6 more
wiley +1 more source
Speed of sound in liquid R134a
International Journal of Refrigeration, 1992 Abstract The speed of sound for liquid R134a (1,1,1,2-tetrafluoroethane) has been measured along isotherms at temperatures from close to the triplee point to above the critical temperature (180–380 K) at pressures from near saturation to 70 MPa. The measurements were made by using a pulse-echo-overlap technique at 3 MHz.
Henrique J.R Guedes, John A Zollweg
openaire +1 more source
Probabilistic Flow Regime Map Modeling of Two-Phase Flow [PDF]
, 2006 The purpose of this investigation is to develop models for two-phase heat transfer, void fraction, and pressure drop, three key design parameters, in single, smooth, horizontal tubes using a common probabilistic two-phase flow regime basis ...
Chato, J.C., Jassim, E.W., Newell, T.A.
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Asia-Pacific Journal of Chemical Engineering, Volume 20, Issue 6, November/December 2025.ABSTRACT Due to its small size, microchannel heat exchangers are widely used in fine engineering fields such as electronic equipment. In this paper, the boiling heat transfer characteristics of refrigerants and nanofluids in microchannels are studied by applying electric fields, magnetic fields, and electromagnetic synergistic fields.
Yanyu Wu +4 more
wiley +1 more source
International Journal of Air-Conditioning and Refrigeration, 2017 This paper presents an experimental analysis of a vapor compression refrigeration system (VCRS) using the mixture of R134a and LPG with mass fractions of 28:72 as an alternative to R134a. In this work, we compare the energy performance of both refrigerants, R134a/LPG (28:72) and R134a, in a monitored vapor compression refrigeration system under a wide
Jatinder Gill, Jagdev Singh
openaire +1 more source
The Effect of Dissolved Water on the Tribological Properties of Polyalkylene Glycol and Polyolester Oils [PDF]
, 1994 The effect of water dissolved in polyalkylene glycol and polyolester oils on the tribological behavior of two material contact pairs in three test environments is evaluated.
Cusano, C. +2 more
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Advanced Sustainable Systems, Volume 9, Issue 10, October 2025.A novel hydrogen‐based multi‐generation system integrates CAES, PEME, and ORC for climate‐responsive power generation. Using response surface methodology, the system is optimized for energy efficiency, emissions, and cost. Results highlight its strong performance in temperate climates and its potential for modular, scalable deployment.
Ehsanolah Assareh +5 more
wiley +1 more source
Analytical considerations of flow boiling heat transfer in metal-foam filled tubes [PDF]
, 2012 Flow boiling in metal-foam filled tube was analytically investigated based on a modified microstructure model, an original boiling heat transfer model and fin analysis for metal foams.
Du, Y.P. +3 more
core +4 more sources
R134a flow boiling heat transfer in small diameter tubes [PDF]
, 2007 Copyright @ 2007 RT Edwards Inc.Boiling heat transfer in small diameter tubes has been experimentally investigated using R134a as the working fluid. The heat transfer periments were conducted with two stainless steel tubes of internal diameter 4.26 mm ...
Huo, Y, Karayiannis, TG, Tian, S
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