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Design and performance study on a large-scale hybrid CPV/T system based on unsteady-state thermal model EI SCIE
期刊论文 | 2019 , 177 , 427-439 | Solar Energy
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Abstract :

A hybrid CPV/T unit designed in this work concentrates solar radiation by a compound parabolic concentrator (CPC) and converts solar energy into electrical and thermal energy by a PV/T module. The CPC eliminating multiple reflections of solar radiation is defined as the ‘EMR-CPC’ in our previous work, which improves photoelectric and thermal conversion efficiencies. Two similar CPV/T units were tested with two-axis tracking device and south-north single-axis tracking device respectively, and the average photoelectric conversion efficiencies were 13% and 12%. A large-scale south-north tracking hybrid CPV/T system with sunlight collecting area of 810 m2 was built to explore practical application of this CPV/T unit. The whole-day thermal efficiency and total thermal output of the large-scale hybrid CPV/T system were 55% and 1,730,039 kJ respectively on April 14, 2017. The steady-state and unsteady-state thermal models of the hybrid CPV/T system were established and the energy loss was analyzed. The calculated whole-day comprehensive thermal efficiencies of the unsteady-state thermal model and the steady-state thermal model were 55.3% and 55.0% respectively, which were close to the measurement 55.8%. However, the steady-state thermal model failed to accurately predict the whole-day thermal efficiency variation of the system. In comparison, the unsteady-state thermal model accurately predicts instantaneous thermal efficiency of the system varying with meteorological conditions and its total daily heat output. © 2018

Keyword :

Compound parabolic concentrator Large-scale CPV/T system Meteorological condition Multiple reflections Performance study Photoelectric conversion efficiency Thermal efficiency Thermal model

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GB/T 7714 Wang, Zexin , Wei, Jinjia , Zhang, Gaoming et al. Design and performance study on a large-scale hybrid CPV/T system based on unsteady-state thermal model [J]. | Solar Energy , 2019 , 177 : 427-439 .
MLA Wang, Zexin et al. "Design and performance study on a large-scale hybrid CPV/T system based on unsteady-state thermal model" . | Solar Energy 177 (2019) : 427-439 .
APA Wang, Zexin , Wei, Jinjia , Zhang, Gaoming , Xie, Huling , Khalid, Muhammad . Design and performance study on a large-scale hybrid CPV/T system based on unsteady-state thermal model . | Solar Energy , 2019 , 177 , 427-439 .
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Correlations for prediction of the bubble departure radius on smooth flat surface during nucleate pool boiling EI SCIE
期刊论文 | 2019 , 132 , 699-714 | International Journal of Heat and Mass Transfer
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Abstract :

Based on a modified force balance model, new correlations were proposed for the prediction of vapor bubble departure radius in saturated and subcooled pool boiling under atmospheric pressure. To predict the departure radius, the wall temperature and contact angle are two important input parameters. Instead of the static contact angle, the present correlations use the dynamic advancing contact angle at root of the bubble base at the moment before bubble detachment (i.e., the maximum dynamic advancing contact angle) to calculate the bubble departure radius. The results show that for the bubble departure radius obtained in this study, the developed correlation can predict all the data points within a maximum error of 3.8% in both normal earth gravity and 0.01ge reduced gravity. Moreover, for data sets in the literature including 1g saturated boiling, 1g subcooled boiling, saturated boiling in reduced gravity, and subcooled boiling in reduced gravity, it is also demonstrated that compared with the thirteen existing correlations, the proposed correlations exhibit a big improvement in predicting bubble departure radius. © 2018 Elsevier Ltd

Keyword :

Advancing contact angle Bubble detachments Force balance models Nucleate pool boiling Pool boiling Reduced gravity Static contact angle Sub-cooled boiling

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GB/T 7714 Wang, Xueli , Wu, Zan , Wei, Jinjia et al. Correlations for prediction of the bubble departure radius on smooth flat surface during nucleate pool boiling [J]. | International Journal of Heat and Mass Transfer , 2019 , 132 : 699-714 .
MLA Wang, Xueli et al. "Correlations for prediction of the bubble departure radius on smooth flat surface during nucleate pool boiling" . | International Journal of Heat and Mass Transfer 132 (2019) : 699-714 .
APA Wang, Xueli , Wu, Zan , Wei, Jinjia , Sundén, Bengt . Correlations for prediction of the bubble departure radius on smooth flat surface during nucleate pool boiling . | International Journal of Heat and Mass Transfer , 2019 , 132 , 699-714 .
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Experimental study of subcooled boiling pool heat transfer and its "hook back" phenomenon on micro/nanostructured surfaces SCIE
期刊论文 | 2019 , 100 , 73-82 | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
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Abstract :

This study presents the pool boiling heat transfer of gas dissolved FC-72 on micro/nanostructured surfaces. The micro/nanostructured surfaces, named LS30, LS70, LS100, LS200, LS400 and LS800 were fabricated by femtosecond laser processing (the number after LS specifies the spacing in mu m). The experiments were conducted at different subcooled degrees (Delta T-sub) of 1 K, 15 K, 25 K and 35 K. For comparison, the pool boiling heat transfer performance of a smooth surface was also tested. It was found that the critical heat flux (CHF) enhancement of micro/nanostructured surfaces increases with increase in subcooling. The maximum CHF of micro/nanostructured surfaces are 1.67, 1.82, 1.95 and 2.06 times larger than that of SS at Delta T-sub = 1, 15, 25 and 35 K, respectively. The processing spacing has pronounced effects on the sensitivity of CHF to subcooling. The CHF of LS30 is enhanced 163% at Delta T-sub = 35 K, while the only a 90% enhancement was obtained for LS800. The "hook back" phenomenon characterized as wall superheat decrease with increasing heat flux on boiling curves at high heat fluxes can be observed on LS30, LS70, LS100, LS200 and LS400. This phenomenon is more clear at the lower subcooling and the lager nanoporous structure covered area.

Keyword :

Subcooling Micro/nanostructure Boiling heat transfer Critical heat flux Hook back phenomenon

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GB/T 7714 Liu, Bin , Liu, Jie , Zhou, Jie et al. Experimental study of subcooled boiling pool heat transfer and its "hook back" phenomenon on micro/nanostructured surfaces [J]. | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2019 , 100 : 73-82 .
MLA Liu, Bin et al. "Experimental study of subcooled boiling pool heat transfer and its "hook back" phenomenon on micro/nanostructured surfaces" . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER 100 (2019) : 73-82 .
APA Liu, Bin , Liu, Jie , Zhou, Jie , Yuan, Bo , Zhang, Yonghai , Wei, Jinjia et al. Experimental study of subcooled boiling pool heat transfer and its "hook back" phenomenon on micro/nanostructured surfaces . | INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER , 2019 , 100 , 73-82 .
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A comprehensive model of a cavity receiver to achieve uniform heat flux using air-carbon particles mixture EI SCIE CPCI-S Scopus
会议论文 | 2018 , 220 , 616-628 | 9th International Conference on Applied Energy (ICAE)
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Abstract :

A non-uniform solar flux leads to a non-uniform temperature distribution on the walls of cavity receiver. There exists a large temperature gradient, which can cause great challenges for the safety and high-efficiency operation of concentrating solar power system (CSP). To overcome this problem, micron particles with strong properties of absorption, scatter and radiation are added into the cavity receiver to improve the non-uniform heat flux distribution on the wall. In the present research, a coupled simulation method based on Monte Carlo Ray Tracing(MCRT) method and Finite Volume Method (FVM) is established to simulate the complex photo-thermal conversion process of a two-dimension square solar cavity filled with air-carbon particle mixtures. In the model, first, the solar heat flux distribution on the surface of cavity receiver is simulated by MCRT and the photo thermal conversion process in the receiver is modeled by FVM. Then both are coupled in the cavity receiver by transferring the absorbed solar energy computed by MCRT to FVM, and this energy is applied as a source term for the energy equation in the FVM part. Based on the coupling model, the thermal performance and the temperature distribution characteristics on the wall of the cavity receiver are studied at various particle densities. The results show that as carbon particle density increases, the heat flux and temperature distribution on the walls of the receiver becomes more uniform and the effects of different L/D and N on sigma(T) of the receiver are further investigated.

Keyword :

Coupled photo-thermal conversion Finite volume method Monte Carlo ray tracing Non-uniform heat flux distribution Solar cavity receiver

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GB/T 7714 Jin, Yabin , Fang, Jiabin , Wei, Jinjia et al. A comprehensive model of a cavity receiver to achieve uniform heat flux using air-carbon particles mixture [C] . 2018 : 616-628 .
MLA Jin, Yabin et al. "A comprehensive model of a cavity receiver to achieve uniform heat flux using air-carbon particles mixture" . (2018) : 616-628 .
APA Jin, Yabin , Fang, Jiabin , Wei, Jinjia , Wang, Xinhe . A comprehensive model of a cavity receiver to achieve uniform heat flux using air-carbon particles mixture . (2018) : 616-628 .
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Coarse-Grained Molecular Dynamics Simulations of the Breakage and Recombination Behaviors of Surfactant Micelles EI CPCI-S SCIE Scopus
会议论文 | 2018 , 57 (27) , 9018-9027 | 254th National Meeting and Exposition of the American-Chemical-Society (ACS) on Chemistry's Impact on the Global Economy
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Abstract :

Surfactant molecules can form micellar network structures that can be applied for turbulent drag reduction through their breakage and recombination behaviors. One of the mechanisms of turbulent drag reduction by surfactants is the "viscoelastic theory" as proposed by DeGennes. However, evaluating the rupture and coalescence properties of network micelles is challenging. Here, we study the breakage and recombination behaviors of an individual rodlike micelle using Martini coarse-grained force field molecular dynamics simulations. The flexibility of an individual micelle can be measured by its breakage energy. Micelle recombination behaviors can be attributed to three mechanisms: the coalescence energy, zeta potential, or hydrophobic driving effect of the surfactant micelles. Thus, an excellent micelle that is beneficial for turbulent drag reduction is difficult to rupture but easy to recombine. The breakage behavior should be considered prior to the recombination behavior, because the breakage energy of an individual micelle is approximately 1-2 magnitudes greater than its coalescence energy under various conditions. Organic counterion salts, such as salicylate sodium, favor micelle recombination because of their electrostatic screen effect and uneven distribution on the surfactant micelle surface. Furthermore, this work brings a novel approach to understanding the breakage and recombination behaviors of surfactant micelles, providing an essential and scientific guidance to the effective use of surfactants in turbulent drag reduction. It also provides direct evidence to support the viscoelastic theory.

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GB/T 7714 Liu, Fei , Liu, Dongjie , Zhou, Wenjing et al. Coarse-Grained Molecular Dynamics Simulations of the Breakage and Recombination Behaviors of Surfactant Micelles [C] . 2018 : 9018-9027 .
MLA Liu, Fei et al. "Coarse-Grained Molecular Dynamics Simulations of the Breakage and Recombination Behaviors of Surfactant Micelles" . (2018) : 9018-9027 .
APA Liu, Fei , Liu, Dongjie , Zhou, Wenjing , Chen, Fei , Wei, Jinjia . Coarse-Grained Molecular Dynamics Simulations of the Breakage and Recombination Behaviors of Surfactant Micelles . (2018) : 9018-9027 .
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Experimental study on drag reduction performance of mixed polymer and surfactant solutions EI SCIE Scopus
期刊论文 | 2018 , 132 , 460-469 | CHEMICAL ENGINEERING RESEARCH & DESIGN
WoS CC Cited Count: 2 SCOPUS Cited Count: 3
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Abstract :

In this work, the mixed aqueous solutions of cationic surfactant - cetyltrimethyl ammonium chloride and non-ionic molecular polymer - polyacrylamide were tested to verify the speculation about their intensification possibilities of drag reduction performance. Sodium salicylate (NaSal) was used as the counter-ion salt. Six different combinations of mixed solution concentrations were tested at different temperatures ranging from 25 degrees C to 50 degrees C. Pure surfactant and polymer solutions were tested as control couples. It was found that the curves of mixed solutions could be divided into enhanced drag reduction zone, stable drag reduction zone and destroyed drag reduction zone. Surfactant molecules form micelles round polymer chains. Then the two additives form a kind of reinforced concrete structures, which were more complex and more effective in restrain vortices, leading to the intensification of drag reduction in enhanced zone and stable zone compared to pure surfactant solutions at low temperatures. The addition of polymers also increased drag reduction efficiency in destroyed zone by providing a wider range of Reynolds numbers. In addition, the results indicated that temperatures were more influential than concentrations, raising the temperature to change the structures of solution is more effective than increasing the quantity of structures. (C) 2018 Institution of Chemical Engineers. Published by Elsevier B.V. All rights reserved.

Keyword :

Synergistic effect Nonionic polymer Temperature Cationic surfactant Drag reduction

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GB/T 7714 Liu, Dongjie , Wang, Qinghui , Wei, Jinjia . Experimental study on drag reduction performance of mixed polymer and surfactant solutions [J]. | CHEMICAL ENGINEERING RESEARCH & DESIGN , 2018 , 132 : 460-469 .
MLA Liu, Dongjie et al. "Experimental study on drag reduction performance of mixed polymer and surfactant solutions" . | CHEMICAL ENGINEERING RESEARCH & DESIGN 132 (2018) : 460-469 .
APA Liu, Dongjie , Wang, Qinghui , Wei, Jinjia . Experimental study on drag reduction performance of mixed polymer and surfactant solutions . | CHEMICAL ENGINEERING RESEARCH & DESIGN , 2018 , 132 , 460-469 .
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Performance investigation on a novel spectral splitting concentrating photovoltaic/thermal system based on direct absorption collection EI SCIE Scopus
期刊论文 | 2018 , 163 , 552-563 | SOLAR ENERGY
WoS CC Cited Count: 2
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Abstract :

The photovoltaic unit and the thermal unit are coupled in a concentrating photovoltaic/thermal (CPV/T) system and solar cells always operate at high temperature in order to obtain high quality thermal energy, which results in the overheating problem of solar cells. In the present study, a novel spectral splitting concentrating photovoltaic/thermal (SS-CPV/T) prototype based on direct absorption collection had been set up. The concentrator in the system is a truncated CPC by eliminating multiple reflections of solar radiation (called EMR), which was designed by our group. Water is used as both spectral splitting medium and heat transfer fluid in the spectral splitting subsystem. Distribution of the incidence angle of the irradiance illuminating on the filter at the outlet aperture of EMR was considered. The radiation transfer model was established to obtain the optical performance of the filter. And the electrical-thermal coupled model was proposed to predict the electrical and thermal performances of the SS-CPV/T system. When the total solar irradiance was about 1000 W/m(2) and the diffuse irradiance ratios were 15.0%, 17.8% and 24.0% respectively, the experimental electrical efficiencies of the SSCPV/T system were 9.6%, 9.4% and 9.0% respectively and the thermal efficiencies were 52.0%, 50.7% and 48.5% respectively. The theoretical electrical efficiencies were 10.4%, 10.2% and 9.8% respectively and the theoretical thermal efficiencies were 52.8%, 51.5% and 49.4% respectively. Comparison experiments on the electrical and thermal performances of the CPV/T systems with and without spectral splitting were also conducted. Under the condition of the same outlet fluid temperature the maximum temperature of solar cells in the SS-CPV/T system was about 5.6 degrees C lower than the temperature of outlet fluid and about 12 degrees C lower than the maximum temperature of solar cells in the CPV/T system without spectral splitting. Finally, the theoretical model was expanded to higher concentration ratios to study the effects of the concentration ratio on the electrical and thermal performances of the CPV/T systems with and without spectral splitting. The results illustrate that compared to the CPV/T system without spectral splitting, the SS-CPV/T system has higher electrical efficiency when the concentration ratio is larger than 10 and higher exergy efficiency when the concentration ratio is larger than 14 for the outlet fluid temperature of 50 degrees C. And for 70 degrees C outlet fluid temperature, these two concentration ratios shift to 9 and 15 respectively. Thus, spectral splitting technology is more advantageous in the CPV/T systems with moderate and high outlet fluid temperature and concentration ratios.

Keyword :

Direct absorption collection Concentrating photovoltaic/thermal Electrical-thermal coupled model Radiation transfer model Concentration ratio Spectral splitting

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GB/T 7714 Zhang, Gaoming , Wei, Jinjia , Xie, Huling et al. Performance investigation on a novel spectral splitting concentrating photovoltaic/thermal system based on direct absorption collection [J]. | SOLAR ENERGY , 2018 , 163 : 552-563 .
MLA Zhang, Gaoming et al. "Performance investigation on a novel spectral splitting concentrating photovoltaic/thermal system based on direct absorption collection" . | SOLAR ENERGY 163 (2018) : 552-563 .
APA Zhang, Gaoming , Wei, Jinjia , Xie, Huling , Wang, Zexin , Xi, Yonghao , Khalid, Muhammad . Performance investigation on a novel spectral splitting concentrating photovoltaic/thermal system based on direct absorption collection . | SOLAR ENERGY , 2018 , 163 , 552-563 .
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Direct numerical simulation of turbulent flow over wide-rib rectangular grooves EI SCIE Scopus
期刊论文 | 2018 , 96 (5) , 1207-1220 | CANADIAN JOURNAL OF CHEMICAL ENGINEERING
WoS CC Cited Count: 3
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Abstract :

The turbulent flow over the wide-rib rectangular grooves, the motions and variations of near-wall streamwise vortices with time, and the interaction between microgroove and near-wall streamwise vortices were investigated by direct numerical simulation method (DNS). The distributions of radius, density, and swirling strength of streamwise vortex were also studied quantitatively by using swirling-strength criterion. It was found that the distribution of vortex radius in smooth channels can approximately be divided into three parts. The vortex radii are smaller in grooved channels than in smooth channels and almost the same when y(+)>40 for all grooved cases. Moreover, a simple prediction method was proposed to estimate the optimal height and spacing of drag-reducing microgrooves for different fluids, and they were about 10 and 17 wall units for water, respectively. Furthermore, using the same frictional velocity u to normalize the shear stress is more suitable for the quantitative comparison and analysis of different longitudinal microgrooves. The drag-reducing mechanism of longitudinal microgrooves could be considered as the competition results between the restriction or blockage effect of microgroove on the near-wall vortices (causing a drag-reducing effect) and the tip effect of microgrooves caused by the scouring of higher speed fluid near the groove tip (causing a drag-increasing effect). A large number of small streamwise secondary vortices with small swirling strength within the groove valley, which are induced by microgrooves, may be the essential reason of drag reduction by microgrooves.

Keyword :

turbulence grooves vortices direct numerical simulation drag reduction

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GB/T 7714 Huang, Chonghai , Wang, Qinghui , Wei, Jinjia et al. Direct numerical simulation of turbulent flow over wide-rib rectangular grooves [J]. | CANADIAN JOURNAL OF CHEMICAL ENGINEERING , 2018 , 96 (5) : 1207-1220 .
MLA Huang, Chonghai et al. "Direct numerical simulation of turbulent flow over wide-rib rectangular grooves" . | CANADIAN JOURNAL OF CHEMICAL ENGINEERING 96 . 5 (2018) : 1207-1220 .
APA Huang, Chonghai , Wang, Qinghui , Wei, Jinjia , Yu, Bo . Direct numerical simulation of turbulent flow over wide-rib rectangular grooves . | CANADIAN JOURNAL OF CHEMICAL ENGINEERING , 2018 , 96 (5) , 1207-1220 .
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Experimental study of pool boiling heat transfer on novel bistructured surfaces based on micro-pin-finned structure SCIE
期刊论文 | 2018 , 91 , 9-19 | EXPERIMENTAL THERMAL AND FLUID SCIENCE
WoS CC Cited Count: 5
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Abstract :

The pool boiling heat transfer performance of bistructured surface based on micro-pin-fmned structure was experimentally investigated in this study. A high speed camera with microscope was applied to capture the micronization boiling phenomenon and study the mechanism of bistructured surfaces. The micro-pin-finned area and the smooth area are fractally distributed on the heating surface by micromaching (dry etching) method. The P-doped silicon chips with 6 different surface types smooth chip, PF30-60 (micro-pin-fins with 30 pm fin side length and 60 gm fin height), PF30-60LS (large smooth strips distributed in micro-pin-finned area), PF30-60SS (small strips distributed in micro-pin-finned area), PF30-60LP (large smooth passages distributed in micro-pin finned area) and PF30-60SP (small passages distributed in micro-pin-finned area) were tested in FC-72. The experimental results indicate that the bistructured surfaces can efficiently enhance the heat transfer performance in the nucleate boiling region, and the critical heat flux (CHF) is also significantly improved. From the micronization boiling phenomenon it can be observed that the bistructured surfaces can lead to a more vitality of bubbles: large number of nucleation sites are formed in the micro-pin-finned area, and the small bubbles grow, collide, merge and move rapidly to the nearby smooth channel. When the bubble grows large enough, it will departure quickly under the force of channel pressure. The micronization phenomenon also reveals that the boundary lines between the structured and smooth areas are active nucleate site region.

Keyword :

Micronization phenomenon Micro-pin-fin Pool boiling Bistructured surface

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GB/T 7714 Kong, Xin , Zhang, Yonghai , Wei, Jinjia . Experimental study of pool boiling heat transfer on novel bistructured surfaces based on micro-pin-finned structure [J]. | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 91 : 9-19 .
MLA Kong, Xin et al. "Experimental study of pool boiling heat transfer on novel bistructured surfaces based on micro-pin-finned structure" . | EXPERIMENTAL THERMAL AND FLUID SCIENCE 91 (2018) : 9-19 .
APA Kong, Xin , Zhang, Yonghai , Wei, Jinjia . Experimental study of pool boiling heat transfer on novel bistructured surfaces based on micro-pin-finned structure . | EXPERIMENTAL THERMAL AND FLUID SCIENCE , 2018 , 91 , 9-19 .
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Analysis of a solar Rankine cycle powered refrigerator with zeotropic mixtures EI SCIE Scopus
期刊论文 | 2018 , 162 , 57-66 | SOLAR ENERGY
SCOPUS Cited Count: 1
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Abstract :

A solar organic Rankine cycle (ORC) powered vapor compression cycle (VCC) for refrigeration is under investigation in this paper. To improve the overall system performance, zeotropic mixtures are proposed to be used in the integrated ORC-VCC system for the first time. A thermodynamic model is developed, and a total of eight pure fluids and five zeotropic mixtures with various compositions are evaluated and compared to identify the best combinations of fluids for yielding high system efficiencies. Besides, the influences of generating temperature, refrigerating temperature, superheating and internal heat exchanger (IHE) in ORC on the system performance are analyzed. For the ORC-VCC operating between -5 and 80 degrees C, dry fluid R600a shows the highest system efficiency (0.2212) among the pure fluids. For zeotropic mixtures, there exists a composition range within which binary mixtures always show higher system efficiency than the component pure fluids. Mixture R161/R600a with an R161. mass fraction of 0.25 shows the highest system efficiency (0.3089) among all fluids, which is increased by 39.6% and 54.7% comparing with R600a and R161, respectively. Adding IHE in ORC benefits the system efficiency, and the benefit is much more evident for dry fluids. Superheating makes wet fluids become applicable in ORC-VCC, but it becomes ineffective in improving the system efficiency when there is no IHE in system.

Keyword :

Organic Rankine cycle Refrigeration Solar thermal energy Zeotropic mixture

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GB/T 7714 Zheng, Nan , Wei, Jinjia , Zhao, Li . Analysis of a solar Rankine cycle powered refrigerator with zeotropic mixtures [J]. | SOLAR ENERGY , 2018 , 162 : 57-66 .
MLA Zheng, Nan et al. "Analysis of a solar Rankine cycle powered refrigerator with zeotropic mixtures" . | SOLAR ENERGY 162 (2018) : 57-66 .
APA Zheng, Nan , Wei, Jinjia , Zhao, Li . Analysis of a solar Rankine cycle powered refrigerator with zeotropic mixtures . | SOLAR ENERGY , 2018 , 162 , 57-66 .
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