International journal of refrigeration, Vol. 36 N° 8. International journal of refrigeration - Décembre 2013
| Titre : | International journal of refrigeration, Vol. 36 N° 8. International journal of refrigeration - Décembre 2013 |
| Type de document : | Bulletin |
| Paru le : | 23/01/2014 |
Dépouillements
Article : texte imprimé
Xiande Fang, Auteur ;
Zhanru, Zhou, Auteur ;
Dingkun, Li, Auteur
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Carbon dioxide (CO2) has quite different flow boiling heat transfer characteristics from conventional refrigerants due to its much higher reduced pressures that make its thermodynamic and transport properties very different. There were some stud[...]
Article : texte imprimé
Dae-hwan, Kim, Auteur ;
Siyoung, Jeong, Auteur
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The pressure drop characteristics of CO2 have been experimentally investigated for a mini-channel tube with and without micro rectangular grooves. The multiple mini-channels have an inner diameter of 0.8 mm and the grooves have a rectangular cro[...]
Article : texte imprimé
Kai-Hsiang, Lin, Auteur ;
Cheng-Shu, Kuo, Auteur ;
Wen-Der, Hsieh, Auteur
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In this study, a CO2 transcritical cycle model without imposing any excessive constraints such as fixed discharge pressure and suction pressure is developed. The detailed geometrical variation of the gas cooler and the evaporator have been taken[...]
Article : texte imprimé
Bartosz, Kus, Auteur ;
Petter Nekså, Auteur
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A novel partial admission turbo compressor concept is proposed as an alternative to a conventional radial oil-free CO2 compressor. The concept aims at the improvement of the overall performance through the reduction of the non-stage windage and [...]
Article : texte imprimé
Bartosz, Kus, Auteur ;
Petter Nekså, Auteur
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A 1-dimenional tool for preliminary design and performance prediction of oil-free CO2 compressor is presented. The model describes high speed centrifugal compressor in a hermetic configuration supported on foil gas bearings. To give possibly com[...]
Article : texte imprimé
N. Lakshmi Narasimhan, Auteur ;
G. Venkatarathnam, Auteur
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The performance of Joule–Thomson refrigerators operating with mixed refrigerants depends on the composition of mixtures as well as the hardware employed. The role of mixture composition on the overall performance of the system has been well addr[...]
Article : texte imprimé
Bilal Ahmed Qureshi, Auteur ;
Syed M. Zubair, Auteur
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Using mechanical sub-cooling systems to increase COP of vapor compression cycles is a known method in literature to save energy and increase efficiency. Recently, much progress has been made with respect to investigation into its different aspec[...]
Article : texte imprimé
Giacomo Bagarella, Auteur ;
Renato M. Lazzarin, Auteur ;
Biagio Lamanna, Auteur
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Cycling losses may be defined as those inefficiencies that reduce the performances of units during the transient period. They may be quantified by comparing the Energy Efficiency Ratio (EER) of a cycling unit and the EER of the same unit working[...]
Article : texte imprimé
Christian J.L. Hermes, Auteur
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This paper advances a thermodynamic study of the effects of the liquid-to-suction heat exchange in vapor compression refrigeration cycles. The analysis was carried out for refrigerants of current interest, such as R134a, R22, R290, R410A, R600a [...]
Article : texte imprimé
Ye, Yao, Auteur ;
Mengwei, Huang, Auteur ;
Jing Chen, Auteur
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A state-space model has been developed to investigate the dynamic behaviors of refrigeration system. By using vector-matrix notation and linearization, the ordinary differential equations describing the chiller's dynamic thermal behaviors are tr[...]
Article : texte imprimé
Ciro, Aprea, Auteur ;
Adriana Greco, Auteur ;
Angelo Maiorino, Auteur
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This paper deals with the problem of R314a substitution with a natural refrigerant fluid. A comparison is performed between R134a and R744 (CO2). R134a is a hydrofluorocarbon with a large direct warming impact (GWP), whereas the R744 contributio[...]
Article : texte imprimé
H. Abed, Auteur ;
K. Atashkari, Auteur ;
A. Niazmehr, Auteur
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A combined cycle has been proposed for the production of power and refrigeration simultaneously. The cycle can be driven by low grade heat sources such as solar, geothermal and waste heat sources. In the first part of this paper, a model has bee[...]
Article : texte imprimé
José Alexandre Matelli, Auteur ;
Edson Bazzo, Auteur
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Combined Refrigeration and Power (CRP) plants generate power and refrigerate a thermal load simultaneously from the same fuel. The overall efficiency is a parameter based on the first law generally used to quantify the fuel saving, in the sense [...]
Article : texte imprimé
Hanfei Tuo, Auteur ;
Pega Hrnjak, Auteur
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This paper presents an experimental and numerical investigation of the flow maldistribution caused by the pressure drop in headers and its impact on the performance of a microchannel evaporator with horizontal headers and vertically oriented tub[...]
Article : texte imprimé
Hanfei Tuo, Auteur ;
Pega Hrnjak, Auteur
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This paper presents a proposal for a venting reverse vapor in flash gas removal A/C system in order to improve refrigerant distribution and reduce pressure drop in microchannel evaporator and thus increase system efficiency. Introduction to the [...]
Article : texte imprimé
Yang Zou, Auteur ;
Pega S. Hrnjak, Auteur
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This paper presents the R410A adiabatic upward flow in three vertical headers of microchannel heat exchangers. All microchannel tubes are inserted into the half depth. The objectives are to explore what affects R410A distribution and attempt to [...]
Article : texte imprimé
Giovanni Di Nicola, Auteur ;
J. Steven Brown, Auteur ;
Laura Fedele, Auteur
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The fluorinated propene isomer R1243zf (3,3,3-trifluoroprop-1-ene, CF3CFdouble bond; length as m-dashCH2, CAS number 677-21-4) is a potential alternative refrigerant with short atmospheric lifetime, low-GWP, and low acute toxicity; however, beca[...]
Article : texte imprimé
Noboru Kagawa, Auteur ;
Atsushi Matsuguchi, Auteur ;
Kenichi Yamaya, Auteur
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The specific isobaric heat capacity was measured for R 32 (difluoromethane) in the gas phase. Twenty-one measurements for R 32 were obtained at temperatures from 282 to 319 K and at pressures from 1.0 to 2.4 MPa, which are very close to the satu[...]
Article : texte imprimé
Shahin Khosharay, Auteur ;
Masoumeh Seyfi Mazraeno, Auteur ;
Farshad Varaminian, Auteur
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In this work, the surface tensions of pure refrigerants and binary, ternary, and quaternary refrigerant mixtures were modeled. A simple and reliable model was used, combining the linear gradient theory (LGT) with the Heyen equation of state (Hey[...]
Article : texte imprimé
Jisun Jeong, Auteur ;
Chengguo, Li, Auteur ;
Younghwan, Kwon, Auteur
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The viscosity and thermal conductivity of ZnO nanofluids with nanoparticle shapes of nearly rectangular and of sphere, were experimentally investigated under various volume concentrations of the nanoparticles, ranging from 0.05 to 5.0 vol.%. The[...]
Article : texte imprimé
Claudio A. Faúndez, Auteur ;
Luis A. Barrientos, Auteur ;
José O. Valderrama, Auteur
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Phase equilibrium data of temperature, pressure and solubility (T-P-x) of hydrofluorocarbon-type refrigerants in different types of ionic liquids over wide ranges of temperatures and pressures are modeled and tested for thermodynamic consistency[...]
Article : texte imprimé
J. M. Corberán, Auteur ;
D. Donadello, Auteur ;
I. Martínez-Galván, Auteur
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This paper presents the results of an experimental campaign for the characterization of the dynamic behavior of a water-to-water refrigeration/heat-pump unit under ON/OFF operation. The unit was previously tested at different water inlet tempera[...]
Article : texte imprimé
Sepehr Sanaye, Auteur ;
Hesam Asgari, Auteur
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The gas-engine driven air-to-water heat pump, type air conditioning system, is composed of two major thermodynamic cycles (including the vapor compression refrigeration cycle and the internal combustion gas engine cycle) as well as a refrigerant[...]
Article : texte imprimé
Yiqiang, Jiang, Auteur ;
Jiankai, Dong, Auteur ;
Minglu, Qu, Auteur
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When an air source heat pump (ASHP) unit operates for space heating at a frosting environment, periodic defrosting is necessary to maintain a high system performance. To defrost efficiently, it is necessary to find an effective defrosting contro[...]
Article : texte imprimé
A microwave assisted zeolite–water adsorption heat pump system was designed, manufactured and investigated experimentally. The influence of operation time of microwave oven on performance of the adsorption heat pump was studied. The performance [...]
Article : texte imprimé
Rasool Nasr Isfahani, Auteur ;
Karthikeyan Sampath, Auteur ;
Saeed Moghaddam, Auteur
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This paper presents a study on the efficacy of highly porous nanofibrous membranes for application in membrane-based absorbers and desorbers. Permeability studies showed that membranes with a pore size greater than about one micron have a suffic[...]
Article : texte imprimé
Rang, Tu, Auteur ;
Xiao-Hua, Liu, Auteur ;
Yi, Jiang, Auteur
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A mathematical model of desiccant wheels is established and validated by experimental results. The different effects of substrate, air mixing, and rotation speed on the performance of enthalpy recovery wheels and dehumidification wheels are anal[...]
Article : texte imprimé
Napoleon Enteria, Auteur ;
Hiroshi, Yoshino, Auteur ;
Rie, Takaki, Auteur
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The developed desiccant-evaporative air-conditioning system was evaluated using the exergetic method under controlled environmental conditions to determine the performances of the whole system and its components.
Percentage contributions of e[...]
Article : texte imprimé
Antonio Piacentino, Auteur ;
Miriam Talamo, Auteur
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Thermoeconomic faults diagnosis of air conditioning units is a pioneeristic approach to detect single or multiple faults and quantify their impact in terms of additional energy consumption. The poor reliability of conventional thermoeconomic app[...]
Article : texte imprimé
Chieko Kondou, Auteur ;
Daisuke Baba, Auteur ;
Fumiya Mishima, Auteur
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Flow boiling of a potential refrigerant R32/R1234ze(E) in a horizontal microfin tube of 5.21 mm inner diameter is experimentally investigated. The heat transfer coefficient (HTC) and pressure drop are measured at a saturation temperature of 10 °[...]
Article : texte imprimé
M. van Eldik, Auteur ;
G. Wessels, Auteur
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Fluted tube-in-tube condensers are key components in energy efficient water heating heat pumps. Rousseau et al. (2003) developed a model that incorporates all the essential features of these heat exchangers. A feature of the model was that it al[...]
Article : texte imprimé
S. Y. He, Auteur ;
G. C. Zhang, Auteur ;
Y. Q. Yu, Auteur
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The study aimed to determine the effects of vacuum cooling on the enzymatic antioxidant system of cherry and inhibition of surface-borne bacteria during storage. Cherries were vacuum-cooled and then stored at 1 °C and 95% relative humidity for 1[...]
Article : texte imprimé
Gildas Diguet, Auteur ;
Guoxing, Lin, Auteur ;
Jincan, Chen, Auteur
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The thermodynamic cycle performance of Gadolinium (Gd) and Gd0.87Dy0.13 used as the working substance in regeneration magnetic Brayton and Ericsson refrigeration cycles are investigated under different external magnetic field conditions. Based o[...]
Article : texte imprimé
Masoud Jabbari, Auteur ;
Jon Spangenberg, Auteur ;
Jesper Hattel, Auteur
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The main goal of this work is to study the multiple material flows in side-by-side (SBS) tape casting and analyze the influence of the different material properties, i.e. the density and the viscosity, on the interface between the fluids, since [...]
Article : texte imprimé
Bharatbhushan V. Kamble, Auteur ;
Biju T. Kuzhiveli, Auteur ;
S. Kasthurirengan, Auteur
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The thermoacoustic prime mover (TAPM) has gained considerable attention as a pressure wave generator to drive pulse tube refrigerator (PTR) due to no moving parts, reasonable efficiency, use of environmental friendly working fluids etc. To drive[...]
Article : texte imprimé
N. M. Hariharan, Auteur ;
P. Sivashanmugam, Auteur ;
S. Kasthurirengan, Auteur
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The objective of this study is to analyse the performance of thermoacoustic refrigerator (TAR) measured in terms of hot end temperature and temperature difference across refrigerator stack with two different spacing namely 0.4 mm and 0.8 mm and [...]
Article : texte imprimé
A. Ouadha, Auteur ;
M. Baghdad, Auteur ;
Y. Addad, Auteur
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A numerical study has been conducted to investigate the effects of variable fluid properties on the prediction of a basic tube vortex design. Beforehand, a literature review is presented to highlight some of the recent advances in the enhancemen[...]
Article : texte imprimé
Rijo, Jacob Thomas, Auteur ;
Parthasarathi Ghosh, Auteur ;
Kanchan Chowdhury, Auteur
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In this paper, an attempt has been made to study the influence of different design and operating parameters on the performance of large scale helium liquefiers through the concept of pre-cooling stages. Through exergy analysis and simulation wit[...]
Article : texte imprimé
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