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

  1. [해외논문]   Advisory Board   SCI SCIE


    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. CO2 - CO2 , 2017 , 0140-7007 ,

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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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  2. [해외논문]   Coming Events/ Manifestations Futures   SCI SCIE


    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. I - I , 2017 , 0140-7007 ,

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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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  3. [해외논문]   COP22: Le rOle du froid dans les engagements contre le changement climatique   SCI SCIE


    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 1 - 2 , 2017 , 0140-7007 ,

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    무료다운로드 유료다운로드

    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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  4. [해외논문]   ViscositE, densitE et conductivitE thermique de nanolubrifiants d'oxyde d'aluminium et d'oxyde de zinc   SCI SCIE

    Kedzierski, M.A. (National Institute of Standards and Technology, 100 Bureau Drive, Stop 861, Gaithersburg, MD 20899-8631 ) , Brignoli, R. (National Institute of Standards and Technology, 100 Bureau Drive, Stop 861, Gaithersburg, MD 20899-8631 ) , Quine, K.T. (Department of Mechanical Engineering, The Catholic University of America, 620 Michigan Ave, NE, Washington, DC 20064 ) , Brown, J.S. (Department of Mechanical Engineering, The Catholic University of America, 620 Michigan Ave, NE, Washington, DC 20064)
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 3 - 11 , 2017 , 0140-7007 ,

    초록

    Abstract This paper presents liquid kinematic viscosity, density, and thermal conductivity measurements of eleven different synthetic polyolester-based nanoparticle nanolubricants (dispersions) at atmospheric pressure over the temperature range 288 K to 318 K. Aluminum oxide (Al 2 O 3 ) and zinc oxide (ZnO) nanoparticles with nominal diameters of 127 nm and 135 nm, respectively, were investigated. A good dispersion of the spherical and non-spherical nanoparticles in the lubricant was maintained with a surfactant. Viscosity, density, and thermal conductivity measurements were made for the neat lubricant along with eleven nanolubricants with differing nanoparticle and surfactant mass fractions. Existing models were used to predict kinematic viscosity (±20%), thermal conductivity (±1%), and specific volume (±6%) of the nanolubricant as a function of temperature, nanoparticle mass fraction, surfactant mass fraction, and nanoparticle diameter. The liquid viscosity, density and thermal conductivity were shown to increase with respect to increasing nanoparticle mass fraction. Highlights Viscosity, density, and thermal conductivity measurements of nanolubricant for water chillers were presented. Models capture the effects of nanoparticle size, nanoparticle and surfactant mass fraction, and temperature. Viscosity model based on using nanoparticle size dependent pseudo surfactant and pseudo nanoparticle viscosities. Maxwell equation modeled spherical nanoparticles conductivity; sphericity correction for non-spherical nanoparticles.

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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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  5. [해외논문]   Une Etude des fuites de frigorigEne en froid commercial   SCI SCIE

    Francis, Christina (Corresponding author. London South Bank University, 103 Borough Road, London SE1 0AA, UK. Fax: +44 2078157699.) , Maidment, Graeme , Davies, Gareth
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 12 - 21 , 2017 , 0140-7007 ,

    초록

    Abstract Given that refrigerant demand is set to rapidly increase, long term solutions for leakage prevention are required to affect change in the industry. This paper presents the results of a project which investigated refrigerant leakage within two of the UK's major supermarket chains. Leakage data from 1464 maintenance records were analyzed. The analysis categorized the type, location of each leak and volume of refrigerant replaced during repair. Over 82% of the recorded leaks were from R404A refrigeration systems, and mainly consisted of pipe or joint failures or a leaking seal/gland/core located in the compressor pack and the high pressure liquid line. It is recommended that the industry focuses on improving design, installation and maintenance of pipework and valves, at the components that most often develop faults to minimize refrigerant leakage. Highlights Comprehensive analysis of a large number of F-gas leakage records was conducted. A methodology of categorizing refrigerant leakage incidents is summarized. Common locations and system components prone to leakage are identified. Long term solutions to control refrigerant leakage are discussed.

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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]   Solutions analytiques pour les Echangeurs de chaleur A contre-courant soumis A un flux de chaleur externe et une conduction axiale   SCI SCIE

    Aminuddin, Mohammad (Chemical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia ) , Zubair, Syed M. (Mechanical Engineering Department, King Fahd University of Petroleum & Minerals, Dhahran, Saudi Arabia)
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 22 - 37 , 2017 , 0140-7007 ,

    초록

    Abstract A counter-flow heat exchanger with longitudinal conduction in separating wall is analyzed along with external heat flux. The inhomogeneous system of model equations is solved with the method of variation of parameters. Closed-form expressions are obtained for balanced flow with three types of wall end-conditions and the zero heat in-leak limit verified against reported expressions. In addition, analytical solution is derived for the general unbalanced flow model with non-adiabatic wall ends that is validated against the limiting case of no axial conduction. It enables examining property variations and arbitrary external load by dividing the system into smaller segments and applying the derived expressions to each element. Heat in-leak has higher impact on deterioration in the low NTU region studied when directed toward the hot fluid. As the external parasitic enhances with NTU, a critical NTU is noted in the range 2.8–5.1 for the various cases analyzed. At this optimum condition, the net energy reaching colder stages is between 27% and 55%. Highlights Counter-flow exchanger is analyzed for axial wall conduction and external heat flux. Analytical solutions are verified numerically and validated against limiting cases. Degradation is evaluated through net energy reaching lower stages of refrigeration. Heat in-leak rises with NTU and performance thus exhibits a critical NTU. At larger NTU, deterioration is highest if cold fluid has lower capacity rate.

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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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  7. [해외논문]   Etude expErimentale de la performance d'un rEgEnErateur magnEtique actif soumis A diffErentes formes d'ondes d'Ecoulement de fluide   SCI SCIE

    Teyber, R. (Corresponding author. Department of Mechanical Engineering, Institute for Integrated Energy Systems, University of Victoria, PO Box 1700 STN CSC, Victoria, B.C., Canada V8W 2Y2. Fax: 250-721-6323.) , Trevizoli, P.V. , Niknia, I. , Christiaanse, T.V. , Govindappa, P. , Rowe, A.
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 38 - 46 , 2017 , 0140-7007 ,

    초록

    Abstract A flow control mechanism based on cam actuated valves is designed and implemented on an active magnetic regenerator test apparatus. The objective is to overcome the brief low field period of the nested concentric Halbach array by decreasing the fluid blow width, displacing fluid only when the magnetic field is close to the minimum and maximum values. Flow waveforms are simulated to evaluate varying blow durations with the same displaced volume. AMR experiments are performed where the largest Ex Q of 1.62 W is obtained with V D = 13.90 cm 3 and a diversion ratio of δ = 0.41, 0.41, demonstrating an 11.2% increase over the sinusoidal waveform. Highlights A flow control device based on cam actuated valves is implemented on an AMR device. A no-flow period is used to increase the flow-averaged magnetic field change. The system is simulated to evaluate waveforms of constant displaced volume. AMR experiments are conducted and the performance of each waveform is discussed.

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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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  8. [해외논문]   ModElisation et simulation de tours de refroidissement humide A contre-courant et calcul et corrElation prEcis des coefficients de transfert de masse pour la prEvision de la performance thermique   SCI SCIE

    Llano-Restrepo, Mario (Corresponding author. School of Chemical Engineering, Universidad del Valle, Ciudad Universitaria Melendez, Building 336, Apartado 25360, Cali, Colombia. Fax: +57 2 3392335.) , Monsalve-Reyes, Robinson
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 47 - 72 , 2017 , 0140-7007 ,

    초록

    Abstract This work provides a detailed mathematical derivation of a steady-state one-dimensional continuous differential air-water contactor (CDAWC) model that describes the material and energy balances in a counterflow wet-cooling tower. The model consists of four ordinary differential equations that describe the changes (along the packed height) of the liquid water temperature, dry-bulb temperature of moist air, liquid water mass flowrate, and moist-air humidity mass ratio. The model is formulated for the cases of unsaturated and supersaturated air, and the model equations are compared to those of previous works. It is shown that the equations of some previous models are approximately equivalent to the equations of the CDAWC model. However, the formulation of the CDAWC model is simpler and the resulting equations have a more general form. A simulation method is proposed to determine accurate values of the volumetric mass transfer coefficient by matching the experimental thermal performance of counterflow wet-cooling towers. Highlights Detailed mathematical derivation is given for a continuous differential air-water contactor (CDAWC) model of cooling towers. The CDAWC model is valid for a bulk gas phase of unsaturated or supersaturated air. The CDAWC model equations are mathematically much simpler than those of previous models. A simulation method is proposed for the accurate calculation of volumetric mass transfer coefficients in cooling towers. Simulation-based volumetric mass transfer coefficients are correlated accurately in terms of cooling-tower inlet quantities.

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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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  9. [해외논문]   DEveloppement d'un capteur de puissance de compresseur virtuel A vitesse variable pour un systEme de conditionnement d'air A dEbit de frigorigEne variable   SCI SCIE

    Guo, Yabin (Department of Refrigeration & Cryogenics, Huazhong University of Science and Technology, Wuhan, China ) , Li, Guannan (Department of Refrigeration & Cryogenics, Huazhong University of Science and Technology, Wuhan, China ) , Chen, Huanxin (Department of Refrigeration & Cryogenics, Huazhong University of Science and Technology, Wuhan, China ) , Hu, Yunpeng (Department of Building Environment and Energy Application Engineering, Wuhan Business University, 816 Dongfeng Avenue, Wuhan, Hubei, 430056, China ) , Shen, Limei (Department of Refrigeration & Cryogenics, Huazhong University of Science and Technology, Wuhan, China ) , Li, Haorong (Durham School of Architectural Engineering and Construction College of Engineering, University of Nebraska-Lincoln, Omaha, NE, USA ) , Hu, Min (Department of Refrigeration & Cryogenics, Huazhong University of Science and Technology, Wuhan, China ) , Li, Jiong (State Key Laboratory of Compressor Technology, Hefei, China)
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 73 - 85 , 2017 , 0140-7007 ,

    초록

    Abstract This paper proposed a universal virtual variable-speed compressor power (VVCP) sensor for VRF system based on 20-coefficient model. Compressor power can be obtained by the VVCP sensor using three input parameters (frequency, condensing temperature and evaporation temperature) which are measured by system itself. The performance of the proposed VVCP sensor is evaluated using experiments data. Experimental conditions include cooling, heating and non-standard refrigerant charge levels. The result shows that the mean square percentage errors (MSPE) are 9.9% under cooling conditions and 7.96% under heating conditions. The MSPE are 9.88% at steady state and 9.75% at dynamic state when the VVCP sensor is applied under nine different refrigerant charge levels. It demonstrated that the proposed VVCP sensor can obtain compressor power under cooling, heating and non-standard refrigerant charge levels, which could be applied to do operational monitoring and fault detection and diagnosis for VRF system at low cost. Highlights Compressor frequency has a strong impact on the compressor power. Condenser and evaporator temperature have a strong impact on the compressor power. The VVCP sensor is established using 20-coefficient method. The VVCP sensor shows good accuracy under cooling conditions and heating conditions. The VVCP sensor still has good performance under non-standard refrigerant charge levels.

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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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  10. [해외논문]   Analyse thEorique et optimisation d'un cycle de refroidissement hybride transcritique au CO2 A compression mEcanique-Ejecteur   SCI SCIE

    Chen, Guangming (Ningbo Institute of Technology, Zhejiang University, 1, QuianHu South Road, Ningbo City, 315100 Zhejiang Province, China ) , Volovyk, Oleksii (Ningbo Institute of Technology, Zhejiang University, 1, QuianHu South Road, Ningbo City, 315100 Zhejiang Province, China ) , Zhu, Daibin (Aux Electric Co. Ltd., 1166 Mingguang Road, Ningbo City, 315100 Zhejiang Province, China ) , Ierin, Volodymyr (Ejector Refrigeration Technologies Center, Odessa National Academy of Food Technologies, 112, Kanatnaya Str., Odessa 65039, Ukraine ) , Shestopalov, Kostyantyn (Ningbo Institute of Technology, Zhejiang University, 1, QuianHu South Road, Ningbo City, 315100 Zhejiang Province, China)
    International journal of refrigeration = Revbue internationale du froid v.74 ,pp. 86 - 94 , 2017 , 0140-7007 ,

    초록

    Abstract The paper provides the results of a design-theoretical study of a hybrid carbon dioxide (CO 2 ) transcritical mechanical compression – ejector cooling cycle. The hybrid cooling cycle is a combination of a CO 2 transcritical mechanical compression refrigeration machine (MCRM) powered by electricity, and an ejector cooling machine (ECM) driven by heat rejected from the CO 2 cooling cycle. Refrigerants R245ca, R601b (neopentane) and R717 (ammonia) are investigated as the working fluids of ECM in the present study. A method to determine the optimal design parameters and performance of the hybrid cooling cycle is presented. It is shown, that efficiency growth of the transcritical CO 2 cooling cycle due to ejector cooling cycle use is higher as evaporating temperatures are lower. Highlights A hybrid CO 2 transcritical mechanical compression – ejector cooling cycle is studied. A method for determination of the optimal design parameters of the hybrid cycle is presented. Hybrid cycle efficiency increases as evaporating temperature decreases.

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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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