International journal of refrigeration, Vol. 34 N° 8. International journal of refrigeration - Décembre 2011
| Titre : | International journal of refrigeration, Vol. 34 N° 8. International journal of refrigeration - Décembre 2011 |
| Type de document : | Bulletin |
| Paru le : | 19/09/2012 |
Dépouillements
Article : texte imprimé
Jae Won Lee, Auteur ;
Jung-Yeul Jung, Auteur ;
Soon-Geul Lee, Auteur
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In this study, the nanoparticles (i.e. SiO2 and Al2O3 nanoparticles) and methanol are combined into SiO2/methanol and Al2O3/methanol nanofluids to enhance the CO2 absorption rate of the base fluid (methanol). The absorption experiments are perfo[...]
Article : texte imprimé
Young-Jin Kim, Auteur ;
Jin Ki Lee, Auteur ;
Yong Tae Kang, Auteur
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The objectives of this paper are to study the absorption characteristics of NH3 bubbles in binary nanoemulsions and to quantify the effect of oil-droplet on the bubble absorption performance. C12E4 and Tween20 are used as the surfactants and n-d[...]
Article : texte imprimé
Liu Yang, Auteur ;
Kai Du, Auteur ;
Xiaofeng Niu, Auteur
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Two types of nanofluids are obtained by adding the mixture of carbon black nanoparticles with emulsifier OP-10, and Al2O3 nanoparticles with sodium dodecyl benzene sulfonate (SDBS) in the ammonia-water solution, respectively. The dispersion stab[...]
Article : texte imprimé
G. Gutiérrez-Urueta, Auteur ;
P. Rodríguez, Auteur ;
M. Venegas, Auteur
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A facility for experimental evaluation of innovative components forming part of a single effect LiBr–H2O adiabatic absorption chiller is described. Plate heat exchangers have been incorporated in the design. Two adiabatic absorber configurations[...]
Article : texte imprimé
The integration of a small commercial ammonia-water absorption refrigerator with a solar concentrator as heat source was analyzed theoretically and experimentally. Operation parameters of the fridge were determined by parametric fitting experime[...]
Article : texte imprimé
Srinivas Garimella, Auteur ;
Ashlie M. Brown, Auteur ;
Ananda Krishna Nagavarapu, Auteur
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A novel cascaded absorption/vapor-compression cycle with a high temperature lift for a naval ship application was conceptualized and analyzed. A single-effect LiBr–H2O absorption cycle and a subcritical CO2 vapor-compression cycle were coupled t[...]
Article : texte imprimé
Stephen D. White, Auteur ;
Mark Goldsworthy, Auteur ;
Roger Reece, Auteur
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A number of new desiccant materials have been proposed which have the potential to improve the performance of desiccant wheels being regenerated at low temperature. Desiccant wheels containing two such desiccant materials (zeolite and superadsor[...]
Article : texte imprimé
C. R. H. Bahl, Auteur ;
K. Engelbrecht, Auteur ;
R. Bjørk, Auteur
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Design considerations for a prototype magnetic refrigeration device with a continuously rotating AMR are presented. Building the active magnetic regenerator (AMR) from stacks of elongated plates of the perovskite oxide material La0.67Ca0.33−xSrx[...]
Article : texte imprimé
J. Roudaut, Auteur ;
A. Kedous-Lebouc, Auteur ;
J.-P. Yonnet, Auteur
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A one-dimensional transient model of an active magnetic regenerator has been developed. The magnetocaloric properties are calculated using the Mean field theory and the model is used to study the transient and steady state response of a parallel[...]
Article : texte imprimé
R. Bjørk, Auteur ;
A. Smith, Auteur ;
C. R. H. Bahl, Auteur
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An expression is determined for the mass of the magnet and magnetocaloric material needed for a magnetic refrigerator and these are determined using numerical modeling for both parallel plate and packed sphere bed regenerators as function of tem[...]
Article : texte imprimé
K. Engelbrecht, Auteur ;
K.K. Nielsen, Auteur ;
N. Pryds, Auteur
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Active magnetic regenerative (AMR) systems are being investigated because they represent a potentially attractive alternative to vapor compression technology. The performance of these systems is dependent on the heat transfer and pressure drop p[...]
Article : texte imprimé
Peng, Hao, Auteur ;
Guoliang Ding, Auteur ;
Haitao Hu, Auteur
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Influences of refrigerant-based nanofluid composition and heating condition on the migration of nanoparticles during pool boiling were investigated experimentally. The nanoparticles include Cu (average diameters of 20, 50 and 80 nm), Al and Al2O[...]
Article : texte imprimé
Peng, Hao, Auteur ;
Guoliang Ding, Auteur ;
Haitao Hu, Auteur
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The objective of this study is to propose a model for predicting the migration characteristics of nanoparticles during the refrigerant-based nanofluid pool boiling. In establishing the present model, the departure and rising processes of bubble,[...]
Article : texte imprimé
Shizuo Saitoh, Auteur ;
Chaobin Dang, Auteur ;
Yoshitaka Nakamura, Auteur
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The flow boiling heat transfer coefficient of the low-GWP (global warming potential) refrigerant HFO-1234yf inside a smooth small-diameter horizontal tube (inner diameter: 2 mm) was experimentally investigated. The local heat transfer coefficien[...]
Article : texte imprimé
Miguel Padilla, Auteur ;
Rémi Revellin, Auteur ;
Philippe Haberschill, Auteur
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This study presents 238 pressure drop data points measured for two-phase flow of R-410A in horizontal return bends. The tube diameter (D) varies from 7.90 to 10.85 mm and the curvature ratio (2R/D) from 3.68 to 4.05. The mass velocity ranges fro[...]
Article : texte imprimé
Bilal Ahmed Qureshi, Auteur ;
Syed M. Zubair, Auteur
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In this paper, the rules of thumb used to predict evaporation losses in different evaporative heat exchangers are unified. The accurate prediction of all aspects of evaporative heat exchanger behavior is very important. Accurately predicting eva[...]
Article : texte imprimé
S. Sabbaghi, Auteur ;
A. Rezaii, Auteur ;
Gh.R. Shahri, Auteur
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In this paper an analytical solution for the efficiency of a semi-spherical fin when subjected to simultaneous heat and mass transfer mechanisms is studied. For the mathematical analysis of a wet fin equation, a relationship between humidity rat[...]
Article : texte imprimé
Varun Singh, Auteur ;
Omar Abdelaziz, Auteur ;
Vikrant Aute, Auteur
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A new model for simulating air-to-refrigerant fin-and-tube heat exchangers with computational fluid dynamics (CFD)-based air propagation is introduced. This model is based on a segment-by-segment approach and is developed to be a general purpose[...]
Article : texte imprimé
Santiago Martínez-Ballester, Auteur ;
José-M. Corberán, Auteur ;
José Gonzálvez-Maciá, Auteur
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Most of the current air-to-refrigerant heat exchanger models use the classic ɛ-NTU approach, or some of its assumptions. These models do not account for longitudinal heat conduction in the tube and the fin, and the heat conduction between differ[...]
Article : texte imprimé
Chul Woo Roh, Auteur ;
Min Soo Kim, Auteur
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Recent heat pumps are actively equipped with a refrigerant vapor-injection technique to acquire better performance in severe operating conditions. In this study, the target system which has an additional expansion valve at the outlet of condense[...]
Article : texte imprimé
Xing Xu, Auteur ;
Yunho Hwang, Auteur ;
Reinhard Radermacher, Auteur
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Recent research on vapor injection technique has been mostly focused on performance improvement using different system configurations. The flash tank cycle typically shows better performance than the internal heat exchanger cycle. However, the f[...]
Article : texte imprimé
Hatef Madani, Auteur ;
Joachim Claesson, Auteur ;
Per Lundqvist, Auteur
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In the present paper, as the second part of two, modeling and simulation was carried out for a Ground Source Heat Pump (GSHP) system in the presence of all the most important interacting sub-systems such as building, ground heat source, electric[...]
Article : texte imprimé
Oznur Ozcan, Auteur ;
Onder Ozgener, Auteur
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This study highlights theoretical energetic and exergetic performance evaluation results of Bethe-Zeldovich-Thompson (BZT) fluids in geothermal heat pumps. In this study, hexafluoroethane (R116), octafluoropropane (R218), and octafluorocyclobuta[...]
Article : texte imprimé
Hiroyuki Kumano, Auteur ;
Tetsuo Hirata, Auteur ;
Tomoya Kudoh, Auteur
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The flow characteristics of a tetra-n-butyl ammonium bromide hydrate slurry were investigated experimentally. Reynolds number, tube diameter and solid fraction were varied as the experimental parameters. For laminar flow, it was found that the r[...]
Article : texte imprimé
Hiroyuki Kumano, Auteur ;
Tetsuo Hirata, Auteur ;
Tomoya Kudoh, Auteur
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The heat transfer characteristics of a tetra-n-butyl ammonium bromide hydrate slurry were investigated where the Reynolds number, tube diameters and solid fraction were varied as experimental parameters. For laminar flow, it was found that the r[...]
Article : texte imprimé
V. Langlois, Auteur ;
W. Gautherin, Auteur ;
J. Laurent, Auteur
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The development of ice slurry for refrigeration systems and the enhancement of its efficiency depend on an accurate control of the ice concentration. We present here an ultrasonic method capable to measure precisely the particle concentration in[...]
Article : texte imprimé
Article : texte imprimé
R. Damle, Auteur ;
J. Rigola, Auteur ;
C.D. Pérez-Segarra, Auteur
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Numerical simulation of reciprocating compressors is important for the design, development, improvement and optimization of the elements constituting the compressor circuit. In this work, an object-oriented unstructured modular numerical simulat[...]
Article : texte imprimé
Hiroyuki Kumano, Auteur ;
Tetsuo Hirata, Auteur ;
Shutaro Takeda, Auteur
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The effect of poly-vinyl alcohols (PVAs) on the supercooling of water was investigated experimentally for varying sample volumes and degrees of polymerization and saponification. A statistical analysis was carried out on the experimental results[...]
Article : texte imprimé
Guomin Yang, Auteur ;
Kaihua Guo, Auteur ;
Ning Li, Auteur
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Ice accretion on power lines is a random natural phenomenon and may seriously harm to the safety of power network. However, the mechanism of the freezing process of supercooled water droplet impacting on wires is still not fully understood. In t[...]
Article : texte imprimé
S.K. Padhmanabhan, Auteur ;
D.E. Fisher, Auteur ;
L. Cremaschi, Auteur
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A semi-empirical model that predicts non-uniform frost growth on heat exchangers is developed and experimentally validated. The model is based on a scaling approach that uses the average frost layer properties to predict growth in a quasi-steady[...]
Article : texte imprimé
Fernando T. Knabben, Auteur ;
Christian J.L. Hermes, Auteur ;
Cláudio Melo, Auteur
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The present paper advances an in-situ study of frosting and defrosting processes in tube-fin evaporators of household refrigerators and freezers. Frost growth experiments were carried out using a purpose-built test facility comprised of a refrig[...]
Article : texte imprimé
F. Ampofo, Auteur ;
G.G. Maidment, Auteur ;
J.F. Missenden, Auteur
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The demand for acceptable thermal comfort conditions within the London Underground network has grown over the years. The operation of the network generates a large heat load, with high temperatures recorded in summer in train and on platforms. D[...]
Article : texte imprimé
Yan-Yue Lu, Auteur ;
Junghui Chen, Auteur ;
Tzu-Chi Liu, Auteur
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Energy saving is one of the most important issues in high-tech manufacturing industries, such as semiconductor and electronics, because large chilled water systems are used to satisfy big cooling load requirements. In this paper, a new optimal i[...]
Article : texte imprimé
I.C. Franco, Auteur ;
M. Dall’Agnol, Auteur ;
T.V. Costa, Auteur
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This study proposes to determine empirical models that represent the non-linear dynamics of a pilot refrigeration system (chiller), by using identification techniques of neuro-fuzzy systems (ANFIS). A detailed experimental study of a pilot refri[...]
Article : texte imprimé
Seung Heo, Auteur ;
Cheolung Cheong, Auteur ;
Tae-Hoon Kim, Auteur
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Low-noise centrifugal fans are developed by modifying the linear trailing edge lines of the fan blades into inclined S-shaped lines. The noise reductions achieved by using the inclined S-shaped trailing edges in the existing fans are confirmed b[...]
Article : texte imprimé
Throughout the past decades, the industrial refrigeration industry has developed various “rule of thumb” methods for sizing gravity liquid separators for ammonia and other common refrigerants. However, to date a uniform systematic approach or an[...]
Article : texte imprimé
Václav Vinš, Auteur ;
Jan Hrubý, Auteur
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Even small amount of non-condensable gas – mostly air or nitrogen – present inside a compression refrigerating circuit may decrease the efficiency of the cooling system. So far, a quantitative assessment of the effect of dissolved gases on the c[...]
Article : texte imprimé
T. Dutta, Auteur ;
K.P. Sinhamahapatra, Auteur ;
S. S. Bandyopadhyay, Auteur
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A three dimensional Computational Fluid Dynamics (CFD) model is used to investigate the phenomena of energy and species separation in a vortex tube (VT) with compressed air at normal atmospheric temperature and cryogenic temperature as the worki[...]
Article : texte imprimé
G. Karimi, Auteur ;
J.R. Culham, Auteur ;
V. Kazerouni, Auteur
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Multi-stage thermoelectric coolers offer larger temperature differences between heat source and heat sink than single-stage thermoelectric coolers. In this paper, a pyramid-type multi-stage cooler is analyzed, focusing on the importance of maxim[...]
Article : texte imprimé
Elsa M. Gonçalves, Auteur ;
Marta Abreu, Auteur ;
Brandão, Teresa R. S., Auteur
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Studies were undertaken on colour CIE L*a*b* values, vitamin C (ascorbic acid) and drip loss alterations of frozen broccoli (Brassica oleracea L. ssp. Italica) stored at isothermal (−7, −15, and −25 °C) and non-isothermal (accelerated life testi[...]
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