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< Page ,Total 52 >
A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers EI SCIE Scopus
期刊论文 | 2018 , 11 (7) | ENERGIES
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

Longitudinal heat conduction has a significant effect on the heat transfer performance of plate heat exchangers, but longitudinal heat conduction is usually neglected in numerical studies and the thermal design of a heat exchanger. In this paper, heat transfer models with and without longitudinal heat conduction are proposed to analyze the effect of small-scale longitudinal heat conduction in a plate heat exchanger. The performance of small-scale longitudinal heat conduction is illustrated by temperature and heat flux contours in the heat transfer models with and without longitudinal heat conduction. The results show that small-scale longitudinal heat conduction occurs in the plate and a more uniform temperature profile of the plate is obtained due to small-scale longitudinal heat conduction. In balanced flow, the contributions of longitudinal heat conduction for counter-flow, cross-flow and parallel-flow plate heat exchangers are -3.15%, -0.09% and 0, respectively, whereas, for the respective unbalanced flows they are evaluated to be -1.73%, 0.53% and 0.05%, respectively. Moreover, it is observed that small-scale longitudinal heat conduction in plates is influenced by the thermal conductivity of the plate. The higher the thermal conductivity, the larger is the reduction of thermal performance. The contribution of longitudinal heat conduction varies from -0.54% to -4.01%.

Keyword :

longitudinal heat conduction heat flux distribution plate heat exchanger heat transfer model

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GB/T 7714 Borjigin, Saranmanduh , Ma, Ting , Zeng, Min et al. A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers [J]. | ENERGIES , 2018 , 11 (7) .
MLA Borjigin, Saranmanduh et al. "A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers" . | ENERGIES 11 . 7 (2018) .
APA Borjigin, Saranmanduh , Ma, Ting , Zeng, Min , Wang, Qiuwang . A Numerical Study of Small-Scale Longitudinal Heat Conduction in Plate Heat Exchangers . | ENERGIES , 2018 , 11 (7) .
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Numerical comparison between single PCM and multi-stage PCM based high temperature thermal energy storage for CSP tower plants EI SCIE Scopus
期刊论文 | 2018 , 139 , 609-622 | APPLIED THERMAL ENGINEERING
SCOPUS Cited Count: 2
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Abstract :

This paper is aimed at analyzing the behavior of a packed bed latent heat thermal energy storage system in concentrating solar power (CSP). One way of improving the performance of a latent thermal energy storage system is by implementing the multiple phase change materials (PCMs) design. The behavior of a packed bed latent heat thermal energy storage system at different cases is numerically analyzed. The molten salt is considered for the heat transfer fluid (HTF) with phase change material (PCM) capsules as the filler. In this design, spherical capsules filled with PCMs of different thereto-physical properties are used. The capsules are packed in the bed at different sections based on the PCM melting temperature. The model developed using the Concentric-Dispersion (C-D) equations. The governing equations are solved in MATLAB, and the results obtained are validated against experimental data from the literature. The performance of the systems is calculated. The results show that the three-stage PCMs system with different melting point exhibited the highest energy and exergy efficiency during a charging discharging cycle. Moreover, results show that the three-stage PCMs unit can improve the heat transfer rate greatly and shorten the heat storage time effectively.

Keyword :

Spherical capsule Melting temperature Concentrating solar power Phase change material

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GB/T 7714 Elfeky, K. E. , Ahmed, N. , Wang, Qiuwang . Numerical comparison between single PCM and multi-stage PCM based high temperature thermal energy storage for CSP tower plants [J]. | APPLIED THERMAL ENGINEERING , 2018 , 139 : 609-622 .
MLA Elfeky, K. E. et al. "Numerical comparison between single PCM and multi-stage PCM based high temperature thermal energy storage for CSP tower plants" . | APPLIED THERMAL ENGINEERING 139 (2018) : 609-622 .
APA Elfeky, K. E. , Ahmed, N. , Wang, Qiuwang . Numerical comparison between single PCM and multi-stage PCM based high temperature thermal energy storage for CSP tower plants . | APPLIED THERMAL ENGINEERING , 2018 , 139 , 609-622 .
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Design and optimization of a novel high temperature heat exchanger for waste heat cascade recovery from exhaust flue gases CPCI-S SCIE Scopus
会议论文 | 2018 , 160 , 3-18 | 20th Conference on Process Integration, Modelling and Optimisation for Energy Saving and Pollution Reduction (PRES)
WoS CC Cited Count: 1 SCOPUS Cited Count: 1
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Abstract :

The waste heat of high temperature exhaust flue gases is widely distributed in many industrial processes. Recovery of waste heat is of great significance to energy saving and sustainability. In this paper, a novel high temperature heat exchanger with hybrid enhancement technologies is proposed to improve waste heat recovery efficiency based on the cascade recovery and utilization method. Algorithm for HTHE structural design and optimization is developed and verified according to the experimental results. Heat transfer and pressure drop performance of the proposed HTHE are estimated by using the algorithm. The results show that the effectiveness of the proposed HTHE increases as the gas temperature increases and mass flow rate decreases. Average effectiveness of the proposed HTHE and temperature of preheated air are 12.5% and 85.8 degrees C higher than those of traditional HTHE with additional 70.0% and 22.0% pressure drop on air and gas sides, respectively. The structural optimization of the proposed HTHE is carried out and it shows that the optimized HTHE has better heat transfer capacity and comprehensive performance under identical pressure drop, increasing effectiveness by 12.6% without enlarging pressure drop compared with the non-optimized HTHE. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Twisted tape inserts Internal and external fins High temperature heat exchanger Waste heat recovery Design and optimization

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GB/T 7714 Zhang, Pan , Ma, Ting , Li, Wei-Dong et al. Design and optimization of a novel high temperature heat exchanger for waste heat cascade recovery from exhaust flue gases [C] . 2018 : 3-18 .
MLA Zhang, Pan et al. "Design and optimization of a novel high temperature heat exchanger for waste heat cascade recovery from exhaust flue gases" . (2018) : 3-18 .
APA Zhang, Pan , Ma, Ting , Li, Wei-Dong , Ma, Guang-Yu , Wang, Qiu-Wang . Design and optimization of a novel high temperature heat exchanger for waste heat cascade recovery from exhaust flue gases . (2018) : 3-18 .
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Numerical simulation and circuit network modelling of flow distributions in 2-D array configurations Scopus CPCI-S SCIE
期刊论文 | 2018 , 22 (5) , 1987-1998 | Thermal Science
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Abstract :

© 2018 Society of Thermal Engineers of Serbia. Packing configuration is widely used in chemical industries such as chemical re-action and chromatograph where the flow distribution has a significant effect on the performance of heat and mass transfer. In the present paper, numerical simu-lation is carried out to investigate the fluid-flow in three 2-D array configura-tions including in-line array, staggered array and hexagonal array. Meanwhile, a simplified equivalent circuit network model based on the Voronoi tessellation is proposed to simulate the flow models. It is found that firstly, the local Reynolds number could be used as a criterion to determine the flow regime. Flow with maximum local Reynolds number less than 40 could be regarded as Darcy flow. Secondly, the flow pattern can be well represented by the network model in the range of Darcy flow with the determination method of hydraulic resistance pro-posed in the present paper.

Keyword :

Darcy flow Electrical-fluidic analogy Equivalent circuit model Flow pattern Voronoi tessellation (diagram)

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GB/T 7714 Wang, Jingyu , Yang, Jian , Li, Long et al. Numerical simulation and circuit network modelling of flow distributions in 2-D array configurations [J]. | Thermal Science , 2018 , 22 (5) : 1987-1998 .
MLA Wang, Jingyu et al. "Numerical simulation and circuit network modelling of flow distributions in 2-D array configurations" . | Thermal Science 22 . 5 (2018) : 1987-1998 .
APA Wang, Jingyu , Yang, Jian , Li, Long , Qian, Pei , Wang, Qiuwang . Numerical simulation and circuit network modelling of flow distributions in 2-D array configurations . | Thermal Science , 2018 , 22 (5) , 1987-1998 .
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Thermal resistance matching for thermoelectric cooling systems EI SCIE Scopus
期刊论文 | 2018 , 169 , 186-193 | ENERGY CONVERSION AND MANAGEMENT
WoS CC Cited Count: 1
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Abstract :

The demand of compactness and light-weight for thermoelectric applications requires optimized system integration of thermoelectric module and heat sinks to achieve the best performance under size and weight constraints. This work studies the thermal resistance matching (i.e., optimal thermal resistance allocation of thermoelectric module and heat sinks) for real thermoelectric cooling systems via an integrated theoretical and experimental method. A theoretical model is first developed to study the relationship of thermal resistance allocation and the system cooling power under different operating currents. Modeling results indicate that the optimal thermal resistance of thermoelectric module should account for 40-70% of the total thermal resistance. The effectiveness of thermal resistance matching is then demonstrated in the selection of an optimal thermoelectric module among 73 off-the-shelf modules to develop a portable thermoelectric cooling system. By comparing the cooling performance of two thermoelectric cooling systems with and without thermal resistance matching, it is experimentally demonstrated that the system with thermal resistance matching achieved 10.7-19.8% larger cooling power under the same size and weight constraints. This can be used as a guideline for optimal design of thermoelectric cooling systems.

Keyword :

Thermoelectrics System integration Portable cooling Thermal resistance matching

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GB/T 7714 Lu, Xing , Zhao, Dongliang , Ma, Ting et al. Thermal resistance matching for thermoelectric cooling systems [J]. | ENERGY CONVERSION AND MANAGEMENT , 2018 , 169 : 186-193 .
MLA Lu, Xing et al. "Thermal resistance matching for thermoelectric cooling systems" . | ENERGY CONVERSION AND MANAGEMENT 169 (2018) : 186-193 .
APA Lu, Xing , Zhao, Dongliang , Ma, Ting , Wang, Qiuwang , Fan, Jintu , Yang, Ronggui . Thermal resistance matching for thermoelectric cooling systems . | ENERGY CONVERSION AND MANAGEMENT , 2018 , 169 , 186-193 .
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Recent advances in the analysis of sustainable energy systems EI Scopus SCIE
期刊论文 | 2018 , 11 (10) | Energies
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Abstract :

© 2018 Energies. All rights reserved. EU energy policy is more and more promoting a resilient, efficient and sustainable energy system. Several agreements have been signed in the last few months that set ambitious goals in terms of energy efficiency and emission reductions and to reduce the energy consumption in buildings. These actions are expected to fulfill the goals negotiated at the Paris Agreement in 2015. The successful development of this ambitious energy policy needs to be supported by scientific knowledge: a huge effort must be made in order to develop more efficient energy conversion technologies based both on renewables and fossil fuels. Similarly, researchers are also expected to work on the integration of conventional and novel systems, also taking into account the needs for the management of the novel energy systems in terms of energy storage and devices management. Therefore, a multi-disciplinary approach is required in order to achieve these goals. To ensure that the scientists belonging to the different disciplines are aware of the scientific progress in the other research areas, specific Conferences are periodically organized. One of the most popular conferences in this area is the Sustainable Development of Energy, Water and Environment Systems (SDEWES) Series Conference. The 12th Sustainable Development of Energy, Water and Environment Systems Conference was recently held in Dubrovnik, Croatia. The present Special Issue of Energies, specifically dedicated to the 12th SDEWES Conference, is focused on five main fields: energy policy and energy efficiency in smart energy systems, polygeneration and district heating, advanced combustion techniques and fuels, biomass and building efficiency.

Keyword :

District heating and cooling Renewable energy Smart cities Sustainable development

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GB/T 7714 Calise, Francesco , Costa, Mário , Wang, Qiuwang et al. Recent advances in the analysis of sustainable energy systems [J]. | Energies , 2018 , 11 (10) .
MLA Calise, Francesco et al. "Recent advances in the analysis of sustainable energy systems" . | Energies 11 . 10 (2018) .
APA Calise, Francesco , Costa, Mário , Wang, Qiuwang , Zhang, Xiliang , Duic, Neven . Recent advances in the analysis of sustainable energy systems . | Energies , 2018 , 11 (10) .
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Numerical Study on Mass Transfer and Electrical Performances of Solid Oxide Fuel Cell With Gradient Porosity Anode EI Scopus CSCD PKU
期刊论文 | 2018 , 39 (2) , 379-383 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

In the present paper, a three dimensional mathematic model of solid oxide fuel cell (SOFC) with gradient porosity anode was established to simulate mass transfer and electrical performances in the SOFC. Compared with homogeneous porosity anode SOFC, gradient porosity anode SOFC shows better mass transfer and electrical performances. Results show that gradient porosity anode design not only remains high mass transfer performance, but also effectively adjusts thermal expansion match between the electrode and electrolyte. The maximum output power density of the gradient porosity anode design in this paper could reach 1.005 W•cm-2, which is at least 8.78% higher than that of homogeneous porosity anode SOFC. Therefore, gradient porosity anode design can significantly improve the electrical performance of SOFC. © 2018, Science Press. All right reserved.

Keyword :

Electrical performance Mass transfer performance Mathematic model Maximum output power densities Numerical study Porosity gradients

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GB/T 7714 Fu, Pei , Yang, Jian , Zeng, Min et al. Numerical Study on Mass Transfer and Electrical Performances of Solid Oxide Fuel Cell With Gradient Porosity Anode [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (2) : 379-383 .
MLA Fu, Pei et al. "Numerical Study on Mass Transfer and Electrical Performances of Solid Oxide Fuel Cell With Gradient Porosity Anode" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 2 (2018) : 379-383 .
APA Fu, Pei , Yang, Jian , Zeng, Min , Wang, Qiu-Wang . Numerical Study on Mass Transfer and Electrical Performances of Solid Oxide Fuel Cell With Gradient Porosity Anode . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (2) , 379-383 .
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Numerical Study on Electrical Performance of Solid Oxide Fuel Cell With Gradient Particle Size Anode EI
期刊论文 | 2018 , 39 (8) , 1803-1808 | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics
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Abstract :

In the present paper, a three dimensional mathematic model of a solid oxide fuel cell (SOFC) with a gradient particle size anode was established to study the electrical performance of the SOFC. The effect mechanism of the gradient particle size anode on the cell performance was deeply discussed. Results show that the gradient particle size anode design can effectively reduce the anodic activation, concentration and ohmic overpotentials. The maximum output power density of the gradient particle size anode design in this paper can reach 0.90 W•cm-2, which is 2.59%, 10.30% and 16.26% higher than that of homogeneous SOFC with anode particle size of 0.5 µm, 1.0 µm and 1.5 µm, respectively. It can be concluded that the gradient particle size anode design can significantly improve the electrical performance of SOFC. © 2018, Science Press. All right reserved.

Keyword :

Anodic activation Cell performance Effect mechanism Electrical performance Mathematic model Maximum output power densities Over potential Polarization loss

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GB/T 7714 Fu, Pei , Yang, Jian , Zeng, Min et al. Numerical Study on Electrical Performance of Solid Oxide Fuel Cell With Gradient Particle Size Anode [J]. | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (8) : 1803-1808 .
MLA Fu, Pei et al. "Numerical Study on Electrical Performance of Solid Oxide Fuel Cell With Gradient Particle Size Anode" . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics 39 . 8 (2018) : 1803-1808 .
APA Fu, Pei , Yang, Jian , Zeng, Min , Wang, Qiu-Wang . Numerical Study on Electrical Performance of Solid Oxide Fuel Cell With Gradient Particle Size Anode . | Kung Cheng Je Wu Li Hsueh Pao/Journal of Engineering Thermophysics , 2018 , 39 (8) , 1803-1808 .
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Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio EI SCIE Scopus
期刊论文 | 2018 , 11 (4) | ENERGIES
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Abstract :

Packed beds are widely used in catalytic reactors or nuclear reactors. Reducing the pressure drop and improving the heat transfer performance of a packed bed is a common research aim. The dimpled structure has a complex influence on the flow and heat transfer characteristics. In the present study, the flow and heat transfer characteristics in structured packed beds with smooth or dimpled spheres are numerically investigated, where two different low channel to particle diameter ratios (N = 1.00 and N = 1.15) are considered. The pressure drop and the Nusselt number are obtained. The results show that, for N = 1.00, compared with the structured packed bed with smooth spheres, the structured packed bed with dimpled spheres has a lower pressure drop and little higher Nusselt number at 1500 < Re-H < 14,000, exhibiting an improved overall heat transfer performance. However, for N = 1.15, the structured packed bed with dimpled spheres shows a much higher pressure drop, which dominantly affects the overall heat transfer performance, causing it to be weaker. Comparing the different channel to particle diameter ratios, we find that different configurations can result in: (i) completely different drag reduction effect; and (ii) relatively less influence on heat transfer enhancement.

Keyword :

dimpled sphere numerical simulation low channel to particle diameter ratio pressure drop structured packed bed Nusselt number

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GB/T 7714 Li, Shiyang , Zhou, Lang , Yang, Jian et al. Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio [J]. | ENERGIES , 2018 , 11 (4) .
MLA Li, Shiyang et al. "Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio" . | ENERGIES 11 . 4 (2018) .
APA Li, Shiyang , Zhou, Lang , Yang, Jian , Wang, Qiuwang . Numerical Simulation of Flow and Heat Transfer in Structured Packed Beds with Smooth or Dimpled Spheres at Low Channel to Particle Diameter Ratio . | ENERGIES , 2018 , 11 (4) .
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Pore-scale investigation of gravity effects on phase change heat transfer characteristics using lattice Boltzmann method EI CPCI-S SCIE Scopus
会议论文 | 2018 , 222 , 92-103 | 9th International Conference on Applied Energy (ICAE)
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

Latent heat thermal energy storage (LTES) has been recommended to complicated aerospace systems due to the excellent ability of storing thermal energy in recent years. Metal foam, as an effective additive to enhance the effective thermal conductive coefficient of phase change materials, has been wildly used in the LTES system. In support of the future space exploration, solid-liquid phase change within metal foam under different gravitational accelerations and corresponding heat transfer characteristics are investigated in this work to enhance understanding of heat transfer capability in reduced gravity conditions. A pore-scale lattice Boltzmann method with the double distribution functions is developed to study the solid-liquid phase change problems with the natural convection heat transfer in metal foam. Here, microstructure of metal foam is experimentally obtained by the use of X-ray computed tomography. Two numerical validation cases are performed, one for fluid-solid conjugate heat transfer problem, and the other for melting process in a square cavity without the porous media. The presented lattice Boltzmann results are in good agreement with previous analytical and numerical results. Based on the analysis of temperature and velocity fields during melting within metal foam, it is found that the clockwise circulation, caused by the temperature gradient, leads to the inhomogeneous distribution of liquid-solid interface along vertical direction. What's more, gravity effects on the temperature and velocity fields together with the average Nusselt number and liquid fraction coefficient are investigated. Results show that with the decrease of gravitational accelerations from 1g to 0g, the maximum vertical velocity reduces and the thickness of velocity boundary layer thickens accordingly, and results in the pronounced reduction of average Nusselt number and melting rate. The natural convection appears to be even more tenuous as gravitational acceleration decreases, leading to the dominant heat transfer mechanism transited from convection to conduction, and finally alleviating the phase change process. The liquid fraction under 0g, 0.01g and 0.1g conditions are 54.6%, 58.9% and 67.9% respectively of that under 1g conditions at Fo = 0.06. In addition, porosity effects on phase change heat transfer characteristics are discussed by comparing the liquid fraction with porosity of 0.9, 0.94 and 1. It is found that metal foam with lower porosity shows higher effective thermal conductivity and outstanding heat transfer performance, while the restriction on natural convection should not be neglected, especially for melting region which is dominated by natural convection.

Keyword :

Lattice Boltzmann method Pore scale Metal foam Phase change Gravity effect

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GB/T 7714 Li, Xinyi , Ma, Ting , Liu, Jun et al. Pore-scale investigation of gravity effects on phase change heat transfer characteristics using lattice Boltzmann method [C] . 2018 : 92-103 .
MLA Li, Xinyi et al. "Pore-scale investigation of gravity effects on phase change heat transfer characteristics using lattice Boltzmann method" . (2018) : 92-103 .
APA Li, Xinyi , Ma, Ting , Liu, Jun , Zhang, Hao , Wang, Qiuwang . Pore-scale investigation of gravity effects on phase change heat transfer characteristics using lattice Boltzmann method . (2018) : 92-103 .
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