International journal of refrigeration, Vol. 36 N° 3. International journal of refrigeration - Mai 2013
| Titre : | International journal of refrigeration, Vol. 36 N° 3. International journal of refrigeration - Mai 2013 |
| Type de document : | Bulletin |
| Paru le : | 03/09/2013 |
Dépouillements
Article : texte imprimé
Part I of this critical, non complacent review focuses on the dryer–heat pump integration issue as presented in published R&D studies. It investigates the accuracy of current configurations and proposed improvements, and evaluates their applicab[...]
Article : texte imprimé
Part II of this critical, constructive review investigates the accuracy of laboratory and industrial-scale experimental methods and the results of published R&D studies on drying heat pumps. It tries to evaluate the application potential of prop[...]
Article : texte imprimé
R. N. N. Koury, Auteur ;
R.N. Faria, Auteur ;
R. O. Nunes, Auteur
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This paper presents a study of the dynamic behavior of a vapor compression heat pump for residential water heating. The mathematical models for heat exchangers are formulated by using mass, momentum, and energy conservation equations, while capi[...]
Article : texte imprimé
Hoseong Lee, Auteur ;
Yunho Hwang, Auteur ;
Reinhard Radermacher, Auteur
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Thermal and hydraulic performance of a sinusoidal corrugated plate heat exchanger (PHX) was investigated for the application of a low temperature lift heat pump (LTLHP), which requires unique operating conditions. The water-side heat transfer co[...]
Article : texte imprimé
Shouguo Wang, Auteur ;
Hanfei Tuo, Auteur ;
Feng Cao, Auteur
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For clarify main affecting factors on air-source transcritical CO2 heat pump water heaters, and the influence extent of these main affecting factors, at fixed water inlet temperature of 12 °C, an experimental research was conducted on a prototyp[...]
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A. Rosato, Auteur ;
S. Sibilio, Auteur
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In this paper a recently commercialized three-phase absorption heat pump that is capable of storing energy internally in the form of crystallized salt (LiCl) with water as refrigerant has been experimentally investigated during summer period. Th[...]
Article : texte imprimé
Jaehyeok Heo, Auteur ;
Rin Yun, Auteur ;
Yongchan Kim, Auteur
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In residential air-source heat pump systems, the refrigerant injection technique has rapidly developed in recent years due to its outstanding performance at low ambient temperatures. A numerical simulation model of a flash tank vapor-injection h[...]
Article : texte imprimé
Orhan Ekren, Auteur ;
Serdar Celik, Auteur ;
Brad Noble, Auteur
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Direct current compressors are strong candidates to be employed in energy-efficient refrigeration systems, especially for renewable energy powered units, as these compressors do not require additional components such as a power inverter that an [...]
Article : texte imprimé
Xu Hu, Auteur ;
Qu, Zongchang, Auteur ;
Yang, Xu, Auteur
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This paper introduces a novel rotary compressor named ‘Swing vane compressor’ (SVC) used for automotive air conditioning systems. By the vane structure which is similar to simple supported beam, SVC can bear higher gas working pressure and rotat[...]
Article : texte imprimé
E. Navarro, Auteur ;
I. O. Martínez-Galvan, Auteur ;
J. Nohales, Auteur
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Among the different alternatives proposed in the automotive field to replace R-134a and R-1234yf is a new generation fluid which has recently gained great importance for MAC (Mobile Air Conditioning) systems. This fluid has the advantage of havi[...]
Article : texte imprimé
Jong Kwon Kim, Auteur ;
Ji Hwan Jeong, Auteur
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A linear compressor requires stroke controllers, as the piston movement is sensitive to the ambient temperature. This paper presents the performance characteristics of an inherent capacity-modulated (ICM) linear compressor. The compressor is cap[...]
Article : texte imprimé
Jang-Sik Yang, Auteur ;
Lu Mei, Auteur ;
Ki-Youl Noh, Auteur
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In this paper, numerical studies on size parameters has been conducted to improve the performance of a twin-type rolling piston compressor, which has two cylinders called upper and lower cylinders with phase difference of 180°. In order to verif[...]
Article : texte imprimé
K. Fumoto, Auteur ;
T. Sato, Auteur ;
Tsuyoshi Kawanami, Auteur
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Ice slurry, which is a mixture of fine ice crystals and liquid water, is utilized in ice storage systems owing to its good flowability and large latent heat of fusion. In the present study, a method was developed to generate ice slurry without t[...]
Article : texte imprimé
Hiroyuki Kumano, Auteur ;
Fumito Tamura, Auteur ;
Seigo Sawada, Auteur
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The flow and heat transfer characteristics of ice slurry were investigated experimentally. The characteristics in the transition region were examined in detail. The ice slurry was produced from ethanol solution. Ice packing factor (IPF), Reynold[...]
Article : texte imprimé
Thermal or cold storage by phase change material slurry attracted many attentions in recent years, in which solid fraction distribution in the storage tank is an important issue due to different densities of the solid particle and carrier fluid.[...]
Article : texte imprimé
Huang, M. J., Auteur ;
N. J. Hewitt, Auteur
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Air source heat pumps have numerous advantages in many applications over other heating equipment in marine climates with regard to energy efficiency. The main concerns are based around maintaining a sufficiently high seasonal coefficient of perf[...]
Article : texte imprimé
Sepehr Sanaye, Auteur ;
Ali Shirazi, Auteur
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One method to reduce the peak electrical demand of air-conditioning (A/C) systems is incorporating an ice thermal energy storage (ITES) with the A/C system. In this paper, an ITES system was modeled for A/C applications and analyzed from energy,[...]
Article : texte imprimé
Koji Matsumoto, Auteur ;
Ko Sameshima, Auteur ;
Yoshikazu Teraoka, Auteur
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Recently, the use of ice containing trapped gaseous ozone, which provides the dual benefits of sterilization and deodorization, has gathered increased attention as a food cold storage method. As a method of efficiently trapping gaseous ozone in [...]
Article : texte imprimé
Tatsunori Asaoka, Auteur ;
Hiroyuki Kumano, Auteur ;
Masashi Okada, Auteur
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Fine ice particles that make up an ice slurry have an advantage in heat transfer and melt rapidly because of their large specific surface area. In a dynamic-type ice storage system, an ice particle bed is melted by warm water flowing through it [...]
Article : texte imprimé
Koji Matsumoto, Auteur ;
Hiroyuki Inaba, Auteur ;
Keisuke Murahashi, Auteur
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Ice adhesion to a cooling solid surface sometimes causes a major accident. While, recently, strong ice adhesion force is positively used to fix a workpiece on a table of machine tool during processing. Therefore, it is necessary to control ice a[...]
Article : texte imprimé
J. Navarro-Esbrí, Auteur ;
J. M. Mendoza-Miranda, Auteur ;
A. Mota-Babiloni, Auteur
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This paper presents an experimental analysis of a vapor compression system using R1234yf as a drop-in replacement for R134a. In this work, we compare the energy performance of both refrigerants, R134a and R1234yf, in a monitored vapor compressio[...]
Article : texte imprimé
Christian Lucas, Auteur ;
Juergen Koehler, Auteur ;
Andreas Schroeder, Auteur
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Ejectors can be used to improve cycle efficiency of refrigeration and heat pump systems. For the simulation of ejector cycles it is required to accurately describe operation conditions of the ejector. In this work, an ejector operation character[...]
Article : texte imprimé
Xing Xu, Auteur ;
Yunho Hwang, Auteur ;
Reinhard Radermacher, Auteur
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As global warming has raised more critical concerns in recent years, refrigerants with high global warming potentials (GWP) are facing the challenges of being phased out. R410A, with a GWP of 2088, has been widely used in residential air-conditi[...]
Article : texte imprimé
One of the critical areas in the outer shell of household refrigerators is the compressor compartment, which has relatively high temperatures, due to the heat generated while the compressor is running. This implies a larger heat transfer to the [...]
Article : texte imprimé
Xiao Hong Han, Auteur ;
Li Peng, Auteur ;
Ying Jie Xu, Auteur
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In this paper, the mixture of HFC-161/HFC-134a (0.6/0.4 in mass fraction), named ‘M5’, is proposed as a substitution of HFC-134a used in automotive air conditioning systems. The theoretical and experimental cycle performances for M5 and HFC-134a[...]
Article : texte imprimé
Article : texte imprimé
Thomas Burdyny, Auteur ;
Andrew Rowe, Auteur
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A simplified model for predicting the general trends of active magnetic regenerator devices is presented. To reduce computational demands it is assumed the regenerator has sufficiently high convective interaction such that a one-phase regenerato[...]
Article : texte imprimé
Giulio Tagliafico, Auteur ;
Federico Scarpa, Auteur ;
Luca A. Tagliafico, Auteur
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The behavior of active magnetic regenerators (AMR) can be described by means of a one-dimensional set of equations. A lot of geometrical, thermo-physical and magnetic parameters influence the behavior and performance of an AMR, together with ext[...]
Article : texte imprimé
Improvement and application of a numerical model for optimizing the design of magnetic refrigerators
Magnetocaloric systems are interesting from the point of view of energy efficiency and could be environment-friendly products. Numerous prototypes have demonstrated the feasibility of such systems for applications around room temperature, but th[...]
Article : texte imprimé
Gildas Diguet, Auteur ;
Guoxing, Lin, Auteur ;
Jincan, Chen, Auteur
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Thermodynamic performance analysis for a magnetic composite material in a regeneration Ericsson refrigeration cycle is presented in this article. The regeneration heats in the two regenerative processes of the Ericsson refrigeration cycle are us[...]
Article : texte imprimé
Takumi Kamiaka, Auteur ;
Chaobin Dang, Auteur ;
Eiji Hihara, Auteur
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Vapor–liquid equilibria (VLE) measurement results for three binary refrigerant mixtures of R1234yf with R32, R125, and R134a are presented. The VLE properties were measured at mass fractions of R1234yf from 25% to 80%. Equilibrium pressures were[...]
Article : texte imprimé
Moisés A. Marcelino Neto, Auteur ;
Jader R. Barbosa Jr., Auteur
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A method based on the theory of departure functions coupled with the Peng and Robinson (1976) equation of state was used to calculate the thermodynamic properties (internal energy, enthalpy, entropy and specific volume) of refrigerant-oil mixtur[...]
Article : texte imprimé
Ilya Polishuk, Auteur ;
Erez Assor, Auteur ;
Naor Cohen, Auteur
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This study compares PC-SAFT and SAFT + Cubic in predicting various thermodynamic properties of 7 haloethanes. The correct estimation of the pure compound critical points contributes to a superior over-all robustness and reliability of SAFT + Cub[...]
Article : texte imprimé
Tatsunori Asaoka, Auteur ;
Hiroyuki Kumano, Auteur ;
Maki Serita, Auteur
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Tetra-n-butylammonium bromide (TBAB) hydrate has favorable properties as a thermal storage material. For example, the phase change temperature, which is from 0 to 12 °C, is suitable for use in air conditioning, and the latent heat is relatively [...]
Article : texte imprimé
Yolanda Cuenca, Auteur ;
Daniel Salavera, Auteur ;
Anton Vernet, Auteur
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The thermal conductivity of NH3 + H2O mixtures (with 0.1–0.5 mass fraction ammonia) was measured at temperatures between 293.15 K and 313.15 K using a transient hot-wire apparatus. The apparatus and method were validated by comparing the measure[...]
Article : texte imprimé
Article : texte imprimé
G. Evola, Auteur ;
N. Le Pierrès, Auteur ;
F. Boudehenn, Auteur
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In this paper, a general mathematical model for the dynamic simulation of a single-effect LiBr/water absorption chiller is presented. The model is based on mass and energy balances applied to the internal components of the machine, and it accoun[...]
Article : texte imprimé
J. Wang, Auteur ;
L. W. Wang, Auteur ;
W. L. Luo, Auteur
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A novel two-stage adsorption freezing machine, which is powered by the heat source with the temperature below 100 °C was developed. The composite adsorbents of CaCl2 and BaCl2 developed by the matrix of expanded natural graphite were chosen as a[...]
Article : texte imprimé
Ahmed A. Askalany, Auteur ;
Bidyut B. Saha, Auteur ;
Mahmoud S. Ahmed, Auteur
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An adsorption cooling system has been designed and built employing granular activated carbon (GAC)–R134a as adsorbent–refrigerant pair. The performance of the system has been determined using a cycle simulation computer program written in Fortra[...]
Article : texte imprimé
Haitao Hu, Auteur ;
Peng, Hao, Auteur ;
Guoliang Ding, Auteur
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The objective of this paper is to investigate the nucleate pool boiling heat transfer characteristics of refrigerant/nanolubricant mixture with surfactant. In the experiments, three types of surfactants including SDS, CTAB and Span-80 were used.[...]
Article : texte imprimé
Jung-Yeul Jung, Auteur ;
Eung Surk Kim, Auteur ;
Youngsuk Nam, Auteur
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In this study, we measured the critical heat flux (CHF) and boiling heat transfer coefficient of H2O/LiBr-based binary nanofluids. By using the PVA (polyvinyl alcohol) as a stabilizer, Al2O3 nanoparticles could be stably dispersed in H2O/LiBr. T[...]
Article : texte imprimé
Nae-Hyun Kim, Auteur ;
Ho-Won Byun, Auteur
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The refrigerant R-134a flow distributions were experimentally studied for a round header-10 flat tube test section simulating a brazed aluminum heat exchanger. Three different inlet orientations (parallel, normal, vertical) were investigated. Te[...]
Article : texte imprimé
R. Yu, Auteur ;
A. D. Sommers, Auteur ;
N. C. Okamoto, Auteur
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In this study, the effectiveness of plain fin-and-tube heat exchangers constructed using anisotropic, micro-patterned aluminum fins has been explored. These fins which can more completely drain the condensate that forms on the heat transfer surf[...]
Article : texte imprimé
Piljoo Kang, Auteur ;
Jaehyeok Heo, Auteur ;
Rin Yun, Auteur
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The condensation heat transfer characteristics of CO2 flowing in a horizontal smooth tube were investigated. The tube diameter was 5.15 mm. The condensation temperature ranged from −10 to 5 °C, and the mass flux was from 600 to 1000 kg m−2 s−1. [...]
Article : texte imprimé
Xifeng Zhao, Auteur ;
Jinju Sun, Auteur ;
Zhi Zhang, Auteur
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The study has focused on outdoor unit noise reduction by fan geometry modification with the refined numerical and experimental approaches. The outlet louver, electric motor and its support are included to refine the flow and acoustic model and a[...]
Article : texte imprimé
A. R. East, Auteur ;
N. J. Smale, Auteur ;
Francisco J. Trujillo, Auteur
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Optimal storage conditions for apples are usually defined as those that maximise possible storage duration, but could be redefined as those conditions that result in sufficient preservation whilst minimising energy costs. A review of research on[...]
Article : texte imprimé
K. Vinther, Auteur ;
H. Rasmussen, Auteur ;
R. Izadi-Zamanabadi, Auteur
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Superheating of refrigerant in the evaporator is an important aspect of safe operation of refrigeration systems. The level of superheat is typically controlled by adjusting the flow of refrigerant using an electronic expansion valve, where the s[...]
Article : texte imprimé
Kim, Woohyun, Auteur ;
James E. Braun, Auteur
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The primary goal was to evaluate and enhance a virtual refrigerant charge (VRC) sensor developed by Li and Braun (2006, 2009). Based on the evaluation, the VRC sensor was found to work well in estimating refrigerant charge for systems that do no[...]
Article : texte imprimé
T. A. H. Ratlamwala, Auteur ;
I. Dincer, Auteur
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The study focuses on defining energy and exergy efficiencies based on three different types of approaches. For each of five key psychometric processes, such as heating or cooling, heating with humidification, cooling with dehumidification, evapo[...]
Article : texte imprimé
J. C. Santos, Auteur ;
G. D. T. Barros, Auteur ;
J. M. Gurgel, Auteur
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This paper presents a study on the performance of the evaporative cooling process in air washers with the use of mass balances, energy and exergy equations. Usually, the performance of these devices is described in terms of their saturation effe[...]
Article : texte imprimé
Won Jae Yoon, Auteur ;
Kookjeong Seo, Auteur ;
Yongchan Kim, Auteur
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The optimization of insulation thickness is very important to increase the performance of domestic refrigerator-freezers (RFs) because of its strong dependency on the heat load through polyurethane-insulated compartments. However, it is very dif[...]
Article : texte imprimé
Yu Shen Liang, Auteur ;
Orathai Wongmetha, Auteur ;
Peih Suan Wu, Auteur
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High ambient temperatures during harvest cause litchi to accumulate heat in the field, which accelerates browning and shortens the sales life of the product. The purpose of this study was to investigate the influence of hydrocooling at 1, 2, 4, [...]
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