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International journal of refrigeration = Revbue in... 60건

  1. [해외논문]   Comparaison de performance d'une pompe A chaleur air/eau utilisant un serpentin A minicanaux comme Evaporateur en remplacement d'un Echangeur de chaleur A tube A ailettes   SCI SCIE

    Garcí (Corresponding author. DITF, ETSII, Universidad Politécnica de Cartagena, Dr. Fleming, s/n, Cartagena, Murcia 30202, Spain. Fax: +34 968 325999.) , a-Cascales, J.R. , Illá , n-Gó , mez, F. , Hidalgo-Mompeá , n, F. , Ramí , rez-Rivera, F.A. , Ramí , rez-Basalo, M.A.
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 560 - 575 , 2017 , 0140-7007 ,

    초록

    Abstract This paper reports the results of an experimental and numerical study of the use of a minichannel coil and a fin-and-tube coil in an air/water heat pump working as evaporator when the system is working in heating mode. The experimental installation developed to test the heat pump unit is briefly described and then the experimental results are presented. Alternatively, the heat pump is modelled using a refrigeration system design program. The results obtained using this model are compared to experimental results allowing the validation of the model. Once the model is validated, it is used to numerically determine the distribution of refrigeration charge and other interesting parameters not experimentally measured. Finally, an analysis of the numerically obtained results is presented in order to study the influence of several operating conditions on refrigerant charge, system COP and heating power for both types of evaporators tested. Highlights The performance of an air/water heat pump is experimentally measured. Two different evaporators, minichannel and fin-and-tube coil are compared. Experimental results are used to validate a model developed using a design software. In all cases the refrigerant charge and the efficiency are lower using a minichannel coil. The advantage of replacing a fin-and-tube evaporator by a minichannel evaporator is not clear.

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  2. [해외논문]   L'impact des propriEtEs magnEtocaloriques sur la performance frigorifique et la conception de machine   SCI SCIE

    Benedict, M.A. (Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA ) , Sherif, S.A. (Department of Mechanical and Aerospace Engineering, University of Florida, Gainesville, FL, USA ) , Schroeder, M. (Advanced Development Group, General Electric Appliances Division, Louisville, KY, USA ) , Beers, D.G. (Advanced Development Group, General Electric Appliances Division, Louisville, KY, USA)
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 576 - 583 , 2017 , 0140-7007 ,

    초록

    Abstract First-order phase transition magnetocaloric materials in multi-stage regenerators are attractive for magnetocaloric refrigeration because of their relatively high available power and the potential for the use of low-cost elements such as iron in their production. In this work a model is used to represent the thermodynamic properties of magnetocaloric materials allowing the magnetocaloric materials to be fully parameterized for the first time. A numerical model is used to carry out a large study including the material parameters and the parameters that describe magnetocaloric machines and their operation. A unique method of evaluating material refrigeration capacity is introduced and used to normalize material inputs. The results are analyzed both in terms of the direct impact of the material parameters and the interactions between machine and material parameters on performance. It was found that machine cooling power was maximized for the cases with the largest adiabatic temperature changes. It was also found that many machine parameters and material parameters interact when determining the performance of a machine. This suggests that materials and machine research would benefit from a closer collaboration. Highlights Modeling parameters for representing first order magnetic transition materials are presented. Results of a modeling study including material parameters and machine parameters are reported. The interactions between materials and machine parameters are investigated. Results are reported relating materials and machine parameters to efficiency.

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  3. [해외논문]   Etude expErimentale du transfert de chaleur par condensation du R-404A dans des tubes enroulEs en hElice   SCI SCIE

    Salimpour, Mohammad Reza (Corresponding author. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran. Fax: +98 31 33912628.) , Shahmoradi, Ali , Khoeini, Davood
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 584 - 591 , 2017 , 0140-7007 ,

    초록

    Abstract In this research, the heat transfer coefficients of R-404A vapor condensation inside helically coiled tubes are studied, experimentally. The effects of different coil pitches and curvature radii at different vapor qualities and mass velocities are considered. The vapor is condensed inside the helically coiled tubes by transferring heat to the cooling water flowing in annulus. Results show that the coil diameter has significant effect on condensation heat transfer coefficient. By decreasing the coil diameter or increasing the Dean number, the heat transfer coefficient is increased as the highest value is obtained at curvature radius of 4.35 cm which is 45% greater than the corresponding figure of curvature radius of 7.65 cm at mass velocity of 125 kg m −2 s −1 . Also, at low vapor qualities, the coil pitch effect is more pronounced. Finally, based on the results, a new correlation is developed to evaluate the condensation heat transfer coefficient of R-404A inside helically coiled tubes. Highlights The effects of different curvature radii and coil pitches have been investigated. The results revealed that the effect of curvature radius is remarkable. The results showed that at low vapor qualities, the coil pitch effect is more pronounced.

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  4. [해외논문]   Comparaison de performances entre une pompe A chaleur combinEe au R134a/CO2 et une pompe A chaleur en cascade au R134a/CO2 pour chauffage de locaux   SCI SCIE

    Song, Yulong (School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China ) , Li, Dongzhe (School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China ) , Yang, Dongfang (School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China ) , Jin, Lei (School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China ) , Cao, Feng (School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China ) , Wang, Xiaolin (School of Engineering and ICT, University of Tasmania, Hobart, TAS 7001, Australia)
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 592 - 605 , 2017 , 0140-7007 ,

    초록

    Abstract In this paper, the performance of combined R134a/CO 2 and cascade R134a/CO 2 systems for space heating was studied and compared under specific operating conditions. A mathematical model was developed for this purpose and was verified by experimental data. The effects of key parameters such as water feed temperature, water supply temperature and ambient temperature on the performance of the two systems were further investigated. Results showed that cascade and combined systems had different preferable application conditions. The cascade system performed better at low ambient temperatures while the combined system performed better under conditions of high ambient temperature and high hot water temperature differences between the system inlet and outlet. A correlation was established and an operating condition coefficient was proposed to determine which system should be used for any given set of working conditions. Highlights The combined R134a/CO 2 and cascade R134a/CO 2 system was compared and studied. Effect of hot water and ambient temperatures on the two systems was investigated. The two systems showed different preferable operating conditions. A correlation was proposed to identify the system for any given operating condition.

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  5. [해외논문]   Une corrElation unifiEe pour le transfert de chaleur durant l'Ebullition dans les mini/micro canaux lisses et standards   SCI SCIE

    Shah, Mirza M. (Engineering Research Associates, 10 Dahlia Lane, Redding, CT 06896, USA. Fax: 203 244 0799.)
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 606 - 626 , 2017 , 0140-7007 ,

    초록

    Abstract A correlation is presented for predicting heat transfer coefficients during saturated boiling prior to critical heat flux in mini/micro channels as well as channels of conventional sizes in horizontal and vertical upward flow. The correlation is verified with a database that includes channels of various shapes (round, rectangle, triangle), fully or partially heated, horizontal and vertical downflow, diameters 0.38 to 27.1 mm, 30 fluids (water, CO 2 , ammonia, halocarbon refrigerants, organics, cryogens), reduced pressure 0.0046 to 0.787, and mass flux 15 to 2437 kg m −2 s −1 . The new correlation predicts the 4852 data points from 137 data sets from 81 sources with a mean absolute deviation of 18.6 %. Several other correlations were also compared with the same database; all had significantly higher deviations. Highlights Presents a new correlation applicable to both macro and mini/micro channels Correlation verified with 4852 data points from 137 data sets from 81sources Data include 30 fluids, diameter 0.38 to 27.1 mm, and reduced pressure 0.0046 to 0.787. Mean absolute deviation 18.6 %, much lower than other correlations

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  6. [해외논문]   Etude expErimentale et numErique du transfert de chaleur par convection forcEe et de la chute de pression dans des canalisations enroulEes en hElice utilisant le nanofluide TiO2/eau   SCI SCIE

    Mahmoudi, Mostafa (Corresponding author. Department of Mechanical Engineering, Isfahan University of Technology, Isfahan 84156-83111, Iran. Fax: (+98)313-3912628.) , Tavakoli, Mohammad Reza , Mirsoleimani, Mohamad Ali , Gholami, Arash , Salimpour, Mohammad Reza
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 627 - 643 , 2017 , 0140-7007 ,

    초록

    Abstract In the present article, forced convection heat transfer and pressure drop in helically coiled pipes using TiO 2 /water nanofluid as working fluid were investigated experimentally and numerically. The aim is to investigate and provide additional insight about the effects of physical and geometrical properties on heat transfer augmentation and pressure drop in helically coiled tubes. The experiments were conducted in the range of Reynolds number from 3000 to 18,000 and in the nanoparticle concentrations of 0.1, 0.2, and 0.5% for five different curvature ratios. In numerical simulations the thermophysical properties of the working fluid were assumed to be a function of nanofluid temperature and concentration. For turbulent regime the standard k − ε model was used to simulate the turbulent flow characteristics. The numerical results were in good agreement with the experimental data. The results showed that utilization of nanofluid instead of distilled water leads to an enhancement in the Nusselt number up to 30%. Also, four formulas were introduced to obtain the average Nusselt number and friction factor in helically coiled tubes under constant wall temperature condition for both laminar and turbulent flow regimes. Highlights A 30% enhancement in heat transfer coefficient was achieved. Increasing the Dean number at fixed Reynolds number increases the heat transfer. The friction factor is an ascending function of nanoparticle concentration. Four general correlations for the Nusselt number and friction factor were proposed.

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  7. [해외논문]   Un appareil pour mesurer la conductivitE thermique de panneaux d'isolation A une tempErature sous-ambiante   SCI SCIE

    Vanapalli, S. (Corresponding author. University of Twente, P.O.B 217, 7500 AE Enschede, The Netherlands. Fax: +31 53 4891099.) , Klü , nder, T. , Hegeman, I. , Tolboom, N. , ter Brake, H.J.M.
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 644 - 650 , 2017 , 0140-7007 ,

    초록

    Abstract A single-sided guarded-plate apparatus has been developed to measure the thermal conductivity of insulation panels of sub-meter size at sub-ambient temperatures ranging from 250 to 300 K. This apparatus allows thermal conductivity measurements to be performed at large temperature differences simulating the actual operating conditions in an application and can accommodate panels of various thickness. The cold plate in the apparatus is cooled with a flow thermostat. The reduction in performance due to the heat conductance along the edge of a vacuum insulation panel is significant at small panel sizes and is detrimental to the end application. The effective thermal conductivity of square vacuum insulation panels of several thickness and area is measured, and is observed that the square panels of side 10 and 20 cm have about twice higher thermal conductivity than their larger counterparts due to the heat leak along the edges of these panels. Highlights A single-sided guarded-plate apparatus is developed. Thermal conductivity of insulation panels at sub-ambient temperature is measured. The apparatus allows measurements to be performed at large temperature differences. The thermal conductance along the edge effect of sub-meter panels is significant.

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  8. [해외논문]   Un facteur de mErite pour la performance globale et la valeur des outils de dEtection et de diagnostic automatique de dEfauts (AFDD)   SCI SCIE

    Yuill, David P. (Durham School of Architectural Engineering and Construction, University of Nebraska –) , Braun, James E. (Lincoln, 1110 S. 67th Street, Omaha, NE 68182, USA )
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 651 - 661 , 2017 , 0140-7007 ,

    초록

    Abstract A figure of merit, V, to characterize the value of an AFDD maintenance tool is presented. The AFDD tool is fed data representing air-conditioners operating with and without faults across a range of conditions. The calculation of V considers the probability of each scenario occurring, the tool's response, and the resulting implications. These results are summed to give a typical average value for deploying the AFDD tool, as compared to maintenance being performed without AFDD. Case studies illustrate the calculation of V. Six AFDD tools and two idealized tools are evaluated. Five of the six real tools give negative V, meaning that their use causes more harm than good. The sixth shows approximately $10 benefit per nominal ton of air-conditioner capacity per typical maintenance visit. This represents about half of the maximum potential value. These results demonstrate the importance of measuring AFDD performance and the potential monetary benefits of AFDD. Highlights A figure of merit (FOM) for automated fault detection and diagnosis tools is proposed. The FOM gives a probable monetary value for deploying an AFDD tool. There is excellent potential for value from AFDD for air-conditioners. Some tools are found to have net negative value. Fault prevalence is an important input, but is uncertain.

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  9. [해외논문]   UnitE de conditionnement d'air solaire A dEshydratant solide en Tunisie: Etude numErique   SCI SCIE

    Zouaoui, Ahlem (Corresponding author. Fax: +216 73500514.) , Zili-Ghedira, Leila , Ben Nasrallah, Sassi
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 662 - 681 , 2017 , 0140-7007 ,

    초록

    Abstract In this paper, a method for the provision of the human thermal comfort through solar activated solid desiccant cooling technologies is discussed. These technologies were numerically studied under different Tunisian climatic conditions (relatively cold and humid: Bizerte; hot and dry: Remeda; moderate: Djerba). The studied solid desiccant cooling is based on the use of a fixed solid desiccant bed instead of a rotary desiccant wheel. The development of the mathematical equations modeling the functioning of the different components (solid fixed bed, heat exchanger, humidifier, solar collector) is based on heat and mass transfers' balances. Results showed good functioning and applicability of these studied systems for various outdoor conditions of the major Tunisian cities. Highlights Three different configuration of desiccant cooling system are simulated under different climatic conditions. Solid desiccant cooling based on the use of fixed solid desiccant bed is studied. Mathematical model based on heat and mass transfers' balances is developed.

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  10. [해외논문]   Evaluation expErimentale du R134a et de son frigorigEne alternatif A faible GWP R513A   SCI SCIE

    Mota-Babiloni, Adriá (Institute for Industrial, Radiophysical and Environmental Safety (ISIRYM), Polytechnic University of Valencia, Camino de Vera s/n, E-46022 Valencia, Spain ) , n (Division of Applied Thermodynamics and Refrigeration, Department of Energy Technology, The Royal Institute of Technology (KTH), Brinellvägen 68, SE-10044 Stockholm, Sweden ) , Makhnatch, Pavel (Division of Applied Thermodynamics and Refrigeration, Department of Energy Technology, The Royal Institute of Technology (KTH), Brinellvägen 68, SE-10044 Stockholm, Sweden ) , Khodabandeh, Rahmatollah (ISTENER Research Group, Department of Mechanical Engineering and Construction, University Jaume I, Campus de Riu Sec s/n, E-12071 Castellón de la Plana, Spain) , Navarro-Esbrí , , Joaquí , n
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 682 - 688 , 2017 , 0140-7007 ,

    초록

    Abstract Lower GWP refrigerants are essential to mitigate the impact of refrigeration systems on climate change. HFO/HFC mixtures are currently considered to replace HFCs in refrigeration and air conditioning systems. The aim of this paper is to present the main operating and performance differences between R513A (GWP of 573) and R134a (GWP of 1300), the most used refrigerants for medium evaporation temperature refrigeration systems and mobile air conditioners. To perform the experimental comparison, 36 tests are carried out with each refrigerant at evaporating temperatures between −15 and 12.5°C and condensing temperatures between 25 and 35°C. The conclusion of the experimental comparison is that R513A can substitute R134a with only a thermostatic expansion valve adjustment, achieving better performance and higher cooling capacity. The discharge temperature of R513A is always lower than that of R134a. Highlights R513A is experimentally compared with R134a in a refrigeration test bench. Evaporation temperatures are varied between −15 and 12.5°C. R513A presents higher mass flow rate and cooling capacity than R134a. Despite higher power consumption, R513A COP is always above than that of R134a. R513A can substitute R134a with lower system modifications.

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    Fig. 1 이미지

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