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

  1. [해외논문]   Etude thEorique d'un meuble de vente frigorifique sans givre   SCI SCIE

    Zhang, Li (Corresponding author. Central Research Institute of Electric Power Industry, 2-6-1 Nagasaka, Yokosuka City, Kanagawa Prefecture 240-0196, Japan. Fax: +81 4 6856 3346.) , Fujinawa, Takeshi , Saikawa, Michiyuki
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 95 - 104 , 2017 , 0140-7007 ,

    초록

    Abstract This study deals with a frost-free refrigerated display cabinet, in which frosting can be retarded by dehumidifying the air before it enters the evaporator of the display cabinet via a desiccant-coated heat exchanger. Because the desiccant can be regenerated via the condensation heat of the refrigerant (which is exhausted into ambient air in conventional refrigerated display cabinets), the proposed system can achieve high energy efficiency. Calculation shows that the coefficient of performance (COP) of this system is 3.1 and the daily electricity consumption of the compressor is 10.5 kWh when the temperature ( T RA ) and relative humidity ( RH RA ) of the return air entering the evaporator are 12 °C and 0.6, respectively. Furthermore, it is found that T RA and RH RA significantly affect the COP: COP increases by about 115% when T RA varies from 8 to 14 °C, and increases by 35% when RH RA varies from 0.5 to 0.8. Highlights A frost-free refrigerated display cabinet system is proposed. Frosting can be retarded by dehumidifying the air of the evaporator via a desiccant. The COP of the proposed system is 3.1.

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  2. [해외논문]   AmElioration de performance d'un cycle frigorifique transcritique au CO2 utilisant des modules thermoElectriques biEtagEs dans un sous refroidisseur et un refroidisseur de gaz   SCI SCIE

    Jamali, Siamak (Corresponding author. Faculty of Mechanical Engineering, University of Tabriz, 29 Bahman Blvd, Tabriz, Iran. Fax: +98 413 3354153.) , Yari, Mortaza , Mohammadkhani, Farzad
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 105 - 115 , 2017 , 0140-7007 ,

    초록

    Abstract A novel integration of a trans-critical CO 2 refrigeration cycle with thermoelectric modules in the gas cooler and sub-cooler is presented, wherein a two-stage thermoelectric generator (TEG) produces power from the waste heat of gas cooler, which is a considerable amount of required power in two-stage thermoelectric cooler (TEC) to sub-cool the refrigerant before expansion device. Mathematical simulation of TEG and TEC as well as energy and exergy based thermodynamic analysis of the proposed system is performed, and the effects of some important parameters on the system performance are investigated. A comparison is carried out between the proposed system and the simple CO 2 refrigeration cycle, indicating that the proposed configuration improves the coefficient of performance (COP) about 19%. Also, it is observed that the TEC and TEG have better performance in a two-stage configuration. The parametric study reveals that the new configuration decreases the cycle operation pressure at maximum COP and exergetic efficiency. Highlights A novel configuration for transcritical cooling cycle is presented and analyzed. TEG and TEC are used for recovering waste heat and sub-cooling, respectively. Four configurations are studied and about 20% improvement in COP is achieved. Pressure ratio is lower than traditional cycle in maximum exergy efficiency.

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  3. [해외논문]   Analyse de compresseur linEaire A base de solEnoIde pour un rEfrigErateur domestique   SCI SCIE

    Bijanzad, A. (Corresponding author. Manufacturing and Automation Research Center, Mechanical Engineering Department, Koc University, Istanbul 34450, Turkey. Fax: +90 (212) 338 1548.) , Hassan, A. , Lazoglu, I.
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 116 - 128 , 2017 , 0140-7007 ,

    초록

    Abstract This article presents the analytical modeling of an oil-free solenoid actuator based linear compressor used in household refrigerators. The stator coil was excited with the pulse width modulated signal which caused linear oscillations in the armature using helical spring. Dynamic characteristics of the linear compressor were studied analytically considering the nonlinearity of the gas and electromagnetic force. The system dynamic models were validated with the finite element simulation as well as a specially designed experimental setup. Frequency response functions of stroke to current as well as pressure to current ratios were generated to evaluate the effect of excitation frequency on the compressor performance. The higher efficiency of the solenoid actuator was achieved when excited at the natural frequency. The results show that the natural frequency of the designed system is around 19 Hz and the work done in a cycle is approximately 1.3 J. Additionally, 47% isentropic and 87% electrical efficiency were achieved. Highlights Dynamics of the solenoid based linear compressor is proposed. The Pulse Width Modulation (PWM) technique is used to excite the solenoid. Resonance phenomenon is applied in order to obtain optimal linear compressor performance. The nonlinear electromagnetic force of the system is modeled and validated with the experimental data. Instead of a linear interpolation method, a novel approach of modeling the gas force is proposed.

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  4. [해외논문]   Analyse Ecologique et de l'efficacitE EnergEtique de conditionneurs d'air A Ejecteur et A compression de vapeur   SCI SCIE

    Chen, Guangming (Ningbo Institute of Technology, Zhejiang University, No.1 Qianhu South Rd, Ningbo 315100, China ) , Zhelezny, Vitaly (Odessa National Academy of Food Technologies, 112 Kanatna str., Odessa 65039, Ukraine ) , Khliyeva, Olga (Odessa National Academy of Food Technologies, 112 Kanatna str., Odessa 65039, Ukraine ) , Shestopalov, Kostyantyn (Ningbo Institute of Technology, Zhejiang University, No.1 Qianhu South Rd, Ningbo 315100, China ) , Ierin, Volodymyr (Odessa National Academy of Food Technologies, 112 Kanatna str., Odessa 65039, Ukraine)
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 129 - 137 , 2017 , 0140-7007 ,

    초록

    Abstract A methodology of eco-energy analysis of power-intensive equipment, based on the calculation of the life cycle greenhouse gas emissions, is presented. According to the presented methodology, a comparative eco-energy analysis of vapor compression and ejector air conditioners operating with R245fa and natural refrigerant R600a at different working conditions in China and Ukraine has been undertaken. As a result, new eco-energy indicators, which allow for the determination of the prospects of alternative air conditioning system implementation, have been developed. It is shown that ejector air conditioners have eco-energy prospects for implementation if they are driven by waste heat from several industries. Highlights A new coefficient for the eco-energy audit is offered. EAC and VCAC operating with various refrigerants are compared. Energy intensity is the important factor in the analysis.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

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  5. [해외논문]   Evaluation de performance d'un systEme de pompe A chaleur A injection de vapeur pour les vEhicules Electriques   SCI SCIE

    Kwon, Chunkyu (Automotive R&D Division, Hyundai Motor Group, 772-1 Jangduk-dong Hwaseong-si, Gyunggi-do 18280, South Korea ) , Kim, Mo Se (Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, South Korea ) , Choi, Younguk (Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, South Korea ) , Kim, Min Soo (Department of Mechanical and Aerospace Engineering, Seoul National University, Seoul 08826, South Korea)
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 138 - 150 , 2017 , 0140-7007 ,

    초록

    Abstract Battery-powered electric vehicles (EV) need an efficient electric heating system for extending the driving mileage. An air-source heat pump system offers an economical alternative for EV because it consumes less energy than a heating system using Joule heat and it can use the same components as an air conditioning system for cooling. However, its performance degradation is inevitable at very low ambient temperatures. Although vapor refrigerant injection is known as a good technology to overcome this problem in residential heat pump systems, the number of vapor injection heat pump studies for EV applications is quite limited. In this paper, considering the characteristics of EV application, the configuration of a vapor injection heat pump system for EV is introduced, and it was modeled, using a scroll compressor geometry-based thermodynamic analysis. The performance was estimated for cold ambient regions under the EV operational conditions. Highlights EV heat pump characteristics are investigated in various ambient conditions. COP in EV heat pump is studied considering vehicle operational condition. Vapor injection is proposed as an alternative EV heat pump in cold conditions. Vapor injection improves air temperature as well as heating capacity.

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    회원님의 원문열람 권한에 따라 열람이 불가능 할 수 있으며 권한이 없는 경우 해당 사이트의 정책에 따라 회원가입 및 유료구매가 필요할 수 있습니다.이동하는 사이트에서의 모든 정보이용은 NDSL과 무관합니다.

    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  6. [해외논문]   Identification de la brUlure de congElation sur la surface du saumon congelE en utilisant l'imagerie hyperspectrale et la vision par ordinateur combinEe avec l'algorithme d'apprentissage automatique   SCI SCIE

    Xu, Jun-Li (Corresponding author. Food Refrigeration and Computerized Food Technology (FRCFT), School of Biosystems and Food Engineering, Agriculture and Food Science Centre, University College Dublin, National University of Ireland, Belfield, Dublin 4, Ireland. Fax: +353 1 7167493.) , Sun, Da-Wen
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 151 - 164 , 2017 , 0140-7007 ,

    초록

    Abstract This study explored the potential of computer vision system (CVS) and hyperspectral imaging (HSI) technique covering spectral range of 900–1700 nm for identifying freezer burnt salmon fillets after frozen storage. Local binary pattern (LBP) descriptor was applied for the RGB image classification. Reflectance spectra were obtained from various positions surface and pretreated using the standard normal variate (SNV) transformation. TreeBagger classifier was used to build classification models for recognition and authentication of the freezer burnt flesh. The results suggested that hyperspectral discrimination performed much better than CVS with the correct classification rate (CCR) of 0.905 in validation and CCR of 0.945 in cross-validation. The effective wavelengths were selected based upon the feature importance in the TreeBagger model and the corresponding optimized model yielded CCR of 0.914 in validation and 0.978 in cross-validation. Overall, the outcome suggested the capability of HSI for rapid categorization of damaged regions on frozen salmon. Highlights HSI and CVS were used to identify freezer burn in salmon fillets. TreeBagger classifier was applied to build classification models. HSI presented better classification performance than CVS. Simplified models were built with good results presented. The visualization of prediction map in salmon fillets was obtained.

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  7. [해외논문]   SystEme de refroidissement assistE par thermosiphon pour les applications frigorifiques   SCI SCIE

    He, Tao (Corresponding author. Department of Mechanical Engineering, State University of New York at Stony Brook, Stony Brook, NY 11794-2300, USA. Fax: +631 632 8544.) , Mei, Chunlei , Longtin, Jon P.
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 165 - 176 , 2017 , 0140-7007 ,

    초록

    Abstract Residential refrigeration is one of the largest contributors to home appliance energy consumption in the U.S. This energy use is nearly doubled if commercial refrigeration is included. By using cold outside temperatures for cooling, however, energy savings can be realized. In this work, a thermosyphon-assisted cooling system for a household refrigerator is presented. A single finned copper-tube thermosyphon with methanol as the working fluid is used. An environmental chamber that can reproduce outside ambient temperatures to −5 °C is located above the refrigerator. Results are presented for different outside temperatures, fan speeds, and filling ratios in the thermosyphon. The electricity use for both the original equipment refrigeration and the thermosyphon system is reported. The interior temperature is found to vary depending on the number of fans that are used to blow air over the thermosyphon evaporator in the refrigerated space. This can be used to produce localized micro-climates within the refrigerated space for further energy savings. Highlights A thermosyphon-based residential/commercial refrigeration system is proposed. Cold outside temperatures are used to provide low-cost cooling for energy savings. Tests were done on a residential refrigerator with a finned copper tube thermosyphon. Viable temperatures were achieved with outside temperatures as high as −0.8 °C. The micro-climate concept that can manage refrigerator's temperature locally is proposed.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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  8. [해외논문]   CaractEristiques d'Ecoulement de fluide et de transfert de chaleur d'un Ecoulement de sEparation et de rEattachement en marche arriEre   SCI SCIE

    Xie, W.A. (School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China ) , Xi, G.N. (School of Mechanical Engineering, Nantong University, Nantong 226019, China)
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 177 - 189 , 2017 , 0140-7007 ,

    초록

    Abstract In this study, a direct numerical simulation of the fluid flow and heat transfer characteristics of separation and reattachment flow at a backward-facing step is presented. A computer program of FORTRAN code is used to solve the governing equations according to finite volume method. The effects of the Reynolds number and expansion ratio on the fluid flow and heat transfer characteristics are investigated. The size of the primary recirculation zone increases with the reduction of expansion ratio and the fluctuation of isotherms increased with the increase of Reynolds number. The periodic characteristics and the dissimilarity between Nu and Cf appear in the transitional flow regime. The rotating fluids in the reattachment region increase the flow instability and the interchange of the hot and cold fluids increases heat transfer instability. The combined effects of flow instability and heat transfer instability play an important role in the formation of the dissimilarity between Nu and Cf. Highlights The flow instability and heat transfer instability increase with the increase of Reynolds number. The dissimilarity between the Nu and C f appears downstream of the primary recirculation zone at Re = 1000. The combined effects of flow instability and heat transfer instability cause the dissimilarity between Nu and C f .

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  9. [해외논문]   Impact expErimental de la conception d'aimant et de rEgEnErateur sur la performance frigorifique de matEriaux magnEtocaloriques de premier ordre   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. 190 - 199 , 2017 , 0140-7007 ,

    초록

    Abstract The first-order magnetic transition material LaFeSiMn(H) is used to create multi-stage regenerators to investigate the importance of regenerator and magnet design on magnetocaloric refrigeration performance. Aspect ratio, magnetic field strength, particle size, and staging are varied while keeping overall span and material mass at a constant level. Tests carried out on these regenerators show that the regenerator and magnetic systems play a key role in determining the performance of a magnetocaloric refrigerator. A one-dimensional numerical machine model using both measured material data and data reconstructed from a mathematical material model is used to predict test results. The machine model and material model make predictions with less than 5% average error over the range of experimental parameters. Highlights Modeling of LaFe based first order magnetocaloric material. Experimental results from a variety of test conditions for a multistage first order regenerator. Statistical comparisons of modeled materials to measured materials. Multiple regenerator designs.

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  10. [해외논문]   Simulation numErique des caractEristiques moyennes de temps d'Ecoulement et de transfert de chaleur de cylindres A double-colonne en ligne dans l'Ecoulement transitionnel utilisant un systEme de grille composEe   SCI SCIE

    Zhou, Shaodong (Shanghai Jiao Tong University, 800 Dong Chuan Rd. Minhang District, Shanghai 200240, China ) , Xi, Guannan (Nantong University, 9 Se Yuan Rd., Nantong 226019, China)
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 200 - 211 , 2017 , 0140-7007 ,

    초록

    Abstract A computational model using a compound grid system for the in-line double column cylinders was developed to investigate the mechanisms of heat transfer enhancement in transitional flow. The results show that flow instability of wake flow causes two different effects, time-mean effect and statistical fluctuation effect (i.e. obtained from the time-mean effect and the statistical fluctuation parameters, respectively), to enhance the heat transfer of the downstream cylinders. According to the clue, time-mean velocity and temperature in the wake of the upstream cylinders as the time-mean effect were investigated. It was found that fast recovery of velocity and temperature improves the effective Reynolds number and temperature difference. Then velocity cross-correction and velocity–temperature cross-correction in the wake of the upstream cylinders as statistical fluctuation effect were investigated. It was found that the fluid mixing enhances the motion in a certain direction near the front face of cylinders. Highlights The compound grid system was used in in-line double-column cylinders. The two different effects, time-mean effect and the statistical fluctuation effect, enhance heat transfer. Flow instability improves the effective Re and the temperature difference. Taking away thermal fluid and bringing cold fluid were identified.

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    NDSL에서는 해당 원문을 복사서비스하고 있습니다. 아래의 원문복사신청 또는 장바구니담기를 통하여 원문복사서비스 이용이 가능합니다.

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