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Heat transfer and fouling performance of finned tube heat exchangers: Experimentation via on line monitoring Scopus SCIE
期刊论文 | 2019 , 236 , 949-959 | Fuel
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Abstract :

© 2018 Elsevier Ltd An on line experimental system was set up in a heating boiler so as to reproduce dusty working environments in heat recovery systems and to investigate heat transfer and fouling performance of different kinds of finned tube heat exchangers. Measurements are reported for the heat transfer coefficients, fouling and the effect of fouling on heat transfer performance of five different H-type finned tube heat exchangers. Fouling resistance and the weakened degree of heat transfer coefficient are employed to evaluate the effect of fouling on the heat transfer performance. Numerical simulations are also conducted on the fouling performance of each heat exchanger bundle and compared to the measurements. Double H-type fins can slightly reduce the heat transfer performance but also reduce fouling. Elliptical finned tubes with the same tube pitch decrease heat transfer performance and increase fouling, and with the same relative tube pitch, significantly increase the heat transfer performance before fouling, and can effectively reduce fouling.

Keyword :

Fouling H-type finned tube Heat transfer On line experiment Waste heat recovery

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GB/T 7714 Wang, Fei-Long , Tang, Song-Zhen , He, Ya-Ling et al. Heat transfer and fouling performance of finned tube heat exchangers: Experimentation via on line monitoring [J]. | Fuel , 2019 , 236 : 949-959 .
MLA Wang, Fei-Long et al. "Heat transfer and fouling performance of finned tube heat exchangers: Experimentation via on line monitoring" . | Fuel 236 (2019) : 949-959 .
APA Wang, Fei-Long , Tang, Song-Zhen , He, Ya-Ling , Kulacki, Francis A. , Yu, Yang . Heat transfer and fouling performance of finned tube heat exchangers: Experimentation via on line monitoring . | Fuel , 2019 , 236 , 949-959 .
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Multi-physics coupling effects of nanostructure characteristics on the all-back-contact silicon solar cell performances EI
期刊论文 | 2019 , 127-136 | Applied Energy
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Abstract :

Nanostructured front surface is an important method to improve the photovoltaic performances. Different nanostructure characteristics, which include the reflectance of nanostructure at a wavelength of 0.35–1.1 μm (Ra,0.35–1.1), the polarization sensitivity, the reflectance of nanostructure at a wavelength of 1.1–2.5 μm (Ra,1.1–2.5), and the surface area enhancement ratio (Ar), have different effects on photovoltaic performances. Therefore, the investigation of the coupling effects of the nanostructure characteristics on photovoltaic performances is an important way to optimize nanostructures. However, there is multi-physics coupling problem in this investigation. Hence, a multi-physics mathematical model is developed and applied in the physical model of an all-back-contact silicon solar cell with nanostructured front surface. Three types of nanostructures are chosen in this study. The grating with rectangle section and moth-eye nanostructures have their own advantages (easy processing and excellent anti-reflection). By combining the advantages of the two types of nanostructures, the grating with parabola section is proposed. The dimensions of the three nanostructures are determined by the height H, the bottom width (diameter), and the spacing L between the two adjacent nanostructures. Through analyzing nanostructure characteristics of each type of nanostructure with 22,386 different dimensions, it is found the grating with parabola section nanostructure not only has relatively lower Ra,0.35–1.1, but also has an advantage in the variation trend of the Ra,0.35–1.1 due to the polarization sensitivity. In addition, its Ar is the lowest, and it is also not sensitive to the variation of the dimension as same as its Ra,1.1–2.5. In this case, comparing to moth-eye with excellent anti-reflection, the grating with parabola section nanostructure not only has an absolute advantage in open circuit voltage and fill factor due to temperature, but also has comprehensive advantage in short circuit current, which make it have best performance in maximum output power density. Based on the analyses, a clear optimization proposal for nanostructures is proposed, and in the end, its effectiveness is verified in the actual environment through dynamic analysis. © 2018 Elsevier Ltd

Keyword :

Back contact Maximum output power densities Moth eye Multi-physics Multi-physics couplings Photovoltaic performance Polarization sensitivity Solar cell performance

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GB/T 7714 Zhou, Yi-Peng , He, Ya-Ling , Tong, Zi-Xiang et al. Multi-physics coupling effects of nanostructure characteristics on the all-back-contact silicon solar cell performances [J]. | Applied Energy , 2019 : 127-136 .
MLA Zhou, Yi-Peng et al. "Multi-physics coupling effects of nanostructure characteristics on the all-back-contact silicon solar cell performances" . | Applied Energy (2019) : 127-136 .
APA Zhou, Yi-Peng , He, Ya-Ling , Tong, Zi-Xiang , Liu, Zhan-Bin . Multi-physics coupling effects of nanostructure characteristics on the all-back-contact silicon solar cell performances . | Applied Energy , 2019 , 127-136 .
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Lattice Boltzmann methods for single-phase and solid-liquid phase-change heat transfer in porous media: A review EI Scopus SCIE
期刊论文 | 2019 , 129 , 160-197 | International Journal of Heat and Mass Transfer
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Abstract :

Over the past 30 years, the lattice Boltzmann (LB) method has been developed into a versatile and powerful numerical methodology for computational fluid dynamics and heat transfer. Owing to its kinetic nature, the LB method has the capability to incorporate the essential mesoscopic physics, and it is particularly successful in modeling transport phenomena involving complex boundaries and interfacial dynamics. Up to now, the LB method has achieved great success in modeling fluid flow and heat transfer in porous media. Since the LB method is inherently transient, it is especially useful for investigating transient solid-liquid phase-change processes wherein the interfacial behaviors are very important. In this article, a comprehensive review of the LB methods for single-phase and solid-liquid phase-change heat transfer in porous media at both the pore scale and representative elementary volume (REV) scale. The review first introduces the fundamental theory of the LB method for fluid flow and heat transfer. Subsequently, the REV-scale LB method for fluid flow and single-phase heat transfer in porous media and the LB method for solid-liquid phase-change heat transfer are discussed in detail. Moreover, the applications of the LB methods in single-phase and solid-liquid phase-change heat transfer in porous media are reviewed. The LB modeling and predictions of the effective thermal conductivity of porous materials are also reviewed. Finally, further developments of the LB method in the related areas are briefly discussed. © 2018 Elsevier Ltd

Keyword :

Effective thermal conductivity Fluid flow and heat transfers Lattice Boltzmann method Modeling and predictions Numerical methodologies Representative elementary volume Single phase heat transfers Solid liquid phase change

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GB/T 7714 He, Ya-Ling , Liu, Qing , Li, Qing et al. Lattice Boltzmann methods for single-phase and solid-liquid phase-change heat transfer in porous media: A review [J]. | International Journal of Heat and Mass Transfer , 2019 , 129 : 160-197 .
MLA He, Ya-Ling et al. "Lattice Boltzmann methods for single-phase and solid-liquid phase-change heat transfer in porous media: A review" . | International Journal of Heat and Mass Transfer 129 (2019) : 160-197 .
APA He, Ya-Ling , Liu, Qing , Li, Qing , Tao, Wen-Quan . Lattice Boltzmann methods for single-phase and solid-liquid phase-change heat transfer in porous media: A review . | International Journal of Heat and Mass Transfer , 2019 , 129 , 160-197 .
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Review of the solar flux distribution in concentrated solar power: Non-uniform features, challenges, and solutions EI
期刊论文 | 2019 , 448-474 | Applied Thermal Engineering
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Abstract :

Concentrated solar flux distribution in the concentrated solar power (CSP) systems is extremely non-uniform, which can lead to high local temperature and large temperature gradient in solar receivers that will cause great challenges for the safety and efficient operation of the system. This paper introduces the non-uniform flux features in four CSP technologies including the parabolic-trough collector, the linear Fresnel collector, the solar power tower, and the parabolic-dish collector. Challenges including degeneration of the materials, thermal stress and deformation, and overburning are summarized. The corresponding solutions proposed to tackle these challenges are emphatically reviewed, and a recommendation for the optimization of the solar collector is provided from this review, which is that the solar flux distribution and the heat transfer ability of the heat transfer fluid (HTF) should match with each other as well as possible. From this point of view, the existing solutions are classified into two groups. One is optimizing the heat transfer ability of the HTF to match with the flux distribution, which is called the passive approach. The other is homogenizing the flux distribution to match with the heat transfer ability of the HTF, which is called the active approach. This review can help to have a better understanding of the non-uniform solar flux features in CSPs, and provide guidance for solving the corresponding challenges. © 2018 Elsevier Ltd

Keyword :

Concentrated solar power Corresponding solutions Linear Fresnel collectors (LFC) Nonuniform temperature Parabolic trough collectors Solar flux Solar receiver Stress and deformation

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GB/T 7714 He, Ya-Ling , Wang, Kun , Qiu, Yu et al. Review of the solar flux distribution in concentrated solar power: Non-uniform features, challenges, and solutions [J]. | Applied Thermal Engineering , 2019 : 448-474 .
MLA He, Ya-Ling et al. "Review of the solar flux distribution in concentrated solar power: Non-uniform features, challenges, and solutions" . | Applied Thermal Engineering (2019) : 448-474 .
APA He, Ya-Ling , Wang, Kun , Qiu, Yu , Du, Bao-Cun , Liang, Qi , Du, Shen . Review of the solar flux distribution in concentrated solar power: Non-uniform features, challenges, and solutions . | Applied Thermal Engineering , 2019 , 448-474 .
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Real-time particle filtration of granular filters for hot gas clean-up EI Scopus SCIE
期刊论文 | 2019 , 237 , 308-319 | Fuel
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Abstract :

A real-time filtration model is developed in this paper, and numerical simulations are presented for filtration performance of a randomly packed granular filter. Fluid flow characteristics and filtration performance at the initial state are first investigated. Correlations of initial filtration efficiency and initial pressure drop are obtained with good prediction accuracy. Particle filtration characteristics on the granule surface show that the real-time filtration model can well predict particle deposition and accumulation characteristics on the granule surface. The particle deposition fraction in the filter decreases with filter depth, and for longer filtration time, inhomogeneity appears in the axial deposition fraction. Correlations of filtration efficiency and pressure drop versus time are presented and both are of sufficient accuracy for engineering purposes. The expression of the cleaning time is obtained, which can be used to determine the optimized cleaning time for economic operation of granular filters. © 2018 Elsevier Ltd

Keyword :

Accumulation characteristics Deposition fractions Filtration efficiency Filtration performance Granular filter Hot gas-clean up Particle depositions Real time scale

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GB/T 7714 Wang, Fei-Long , He, Ya-Ling , Tang, Song-Zhen et al. Real-time particle filtration of granular filters for hot gas clean-up [J]. | Fuel , 2019 , 237 : 308-319 .
MLA Wang, Fei-Long et al. "Real-time particle filtration of granular filters for hot gas clean-up" . | Fuel 237 (2019) : 308-319 .
APA Wang, Fei-Long , He, Ya-Ling , Tang, Song-Zhen , Kulacki, Francis A. , Tao, Yu-Bing . Real-time particle filtration of granular filters for hot gas clean-up . | Fuel , 2019 , 237 , 308-319 .
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A novel optical optimization model for linear Fresnel reflector concentrators EI SCIE Scopus
期刊论文 | 2018 , 129 , 486-499 | RENEWABLE ENERGY
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Abstract :

In this paper, a new optical optimization model for linear Fresnel reflector concentrators (LFRCs) was developed, based on the population-based particle swarm optimization (PSO) algorithm and the statistics-based Monte Carlo ray-tracing (MCRT) method, with a validated LFRC MCRT optical module we developed. To significantly reduce the computing time, this LFRC MCRT module was redesigned using a previously proposed MCRT runtime reduction method and a newly proposed nominal annual LFRC optical efficiency together. Optimization results of the model validation were found to agree well with the known data, with average deviations in the optimized nominal annual LFRC optical efficiency being about 1%, while the computing time reduces by almost four orders of magnitude, proving that our novel optical optimization method and model are feasible, reliable and more time-efficient. After validation, optimizations, analyses and comparisons were carried out for LFRCs of different mirrors and geometrical parameters. It is revealed that the LFRC system of flat mirrors studied can also be optimized to obtain a higher annual optical efficiency (over 60%) as compared with those of parabolic or cylindrical mirrors, while the flat mirror is much easier to manufacture than the other two mirrors, with a much lower price due to the use of inexpensive planar mirrors. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Annual efficiency Particle swarm optimization Monte Carlo ray-tracing Linear Fresnel reflector Optical optimization

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GB/T 7714 Cheng, Ze-Dong , Zhao, Xue-Ru , He, Ya-Ling et al. A novel optical optimization model for linear Fresnel reflector concentrators [J]. | RENEWABLE ENERGY , 2018 , 129 : 486-499 .
MLA Cheng, Ze-Dong et al. "A novel optical optimization model for linear Fresnel reflector concentrators" . | RENEWABLE ENERGY 129 (2018) : 486-499 .
APA Cheng, Ze-Dong , Zhao, Xue-Ru , He, Ya-Ling , Qiu, Yu . A novel optical optimization model for linear Fresnel reflector concentrators . | RENEWABLE ENERGY , 2018 , 129 , 486-499 .
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The study on interface characteristics near the metal wall by a molecular dynamics method EI SCIE Scopus
期刊论文 | 2018 , 164 , 64-72 | COMPUTERS & FLUIDS
SCOPUS Cited Count: 1
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Abstract :

The condensation process of the multiple-atom and polar water molecular at a solid wall is studied. It is found that a monomolecular layer structure is existed on the wall surface and the intensity of solid-liquid potential can be revealed by the monomolecular density peak. At high-temperature conditions, liquid drop in vapor and bubble near wall can be observed. The solid-liquid potential energy on monomolecular layer structure has a greater impact than on gas-liquid interface. The simulated densities in the vapor region are consistent with the macroscopic values by refprop8.0, while in the liquid region the simulated densities are a bit lower than the macroscopic ones. Besides, the solid-liquid-gas three-phase model consisting of argon, water, freon and copper was constructed using Materials Studio software, and their interface characteristics are studied. (C) 2017 Elsevier Ltd. All rights reserved.

Keyword :

Interface characteristic Condensation process Solid wall Materials studio Three-phase model Molecular dynamics

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GB/T 7714 Chen, Lei , Chen, Peng-Fei , Li, Zhong-Zhen et al. The study on interface characteristics near the metal wall by a molecular dynamics method [J]. | COMPUTERS & FLUIDS , 2018 , 164 : 64-72 .
MLA Chen, Lei et al. "The study on interface characteristics near the metal wall by a molecular dynamics method" . | COMPUTERS & FLUIDS 164 (2018) : 64-72 .
APA Chen, Lei , Chen, Peng-Fei , Li, Zhong-Zhen , He, Ya-Ling , Tao, Wen-Quan . The study on interface characteristics near the metal wall by a molecular dynamics method . | COMPUTERS & FLUIDS , 2018 , 164 , 64-72 .
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Study on heat transfer and stress characteristics of the pressurized volumetric receiver in solar power tower system EI SCIE Scopus
期刊论文 | 2018 , 133 , 341-350 | APPLIED THERMAL ENGINEERING
WoS CC Cited Count: 1 SCOPUS Cited Count: 2
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Abstract :

In this paper, the analysis of heat transfer and stress characteristics in pressurized volumetric receiver (PVR) is presented by coupling Monte Carlo Ray Tracing (MCRT), Finite Volume Method (FVM) and Finite Element Method (FEM). Firstly, an integration model coupling MCRT, FVM and FEM applied in PVR is developed. Based on this model, the coupled characteristics of optical-thermal-stress are numerically studied. Meanwhile, the solar flux is homogenized using multi-point aiming strategy for multi-heliostat field zones. Finally, the effects of air mass flow and inlet temperature on the heat transfer and stress characteristics are discussed. The results indicate that the solar flux distributions on aperture and SiC porous absorber are more uniform using multi-point aiming strategy, and the peak flux in porous could be reduced by an order of magnitude compared with single-point. The peak stress of quartz window occurs at the contact position between the steel shell and quartz window, and the damage would not happen because of the peak stress is lower than the ultimate strength. The inlet parameters of air have significantly influences on the heat transfer and stress characteristics of receiver. For example, when the air with higher temperature is adopted, the SiC porous temperature increases by 20%, and the temperature and stress of quartz window increase by 31% and 60%, respectively. The overheating in SiC porous could occur using lower mass flow rates, however, the quartz glass stress exhibits a decreasing tendency when the mass flow decreases. Besides, the temperatures of outlet air and porous absorber increase when the flow rate decreases and inlet temperature increases which would lead to local overheating in absorber and lower stress on quartz window.

Keyword :

Coupled characteristic of optical-thermal-stress Solar power tower Stress Heat transfer Pressurized volumetric receiver

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GB/T 7714 Du, Bao-Cun , Qiu, Yu , He, Ya-Ling et al. Study on heat transfer and stress characteristics of the pressurized volumetric receiver in solar power tower system [J]. | APPLIED THERMAL ENGINEERING , 2018 , 133 : 341-350 .
MLA Du, Bao-Cun et al. "Study on heat transfer and stress characteristics of the pressurized volumetric receiver in solar power tower system" . | APPLIED THERMAL ENGINEERING 133 (2018) : 341-350 .
APA Du, Bao-Cun , Qiu, Yu , He, Ya-Ling , Xue, Xiao-Dai . Study on heat transfer and stress characteristics of the pressurized volumetric receiver in solar power tower system . | APPLIED THERMAL ENGINEERING , 2018 , 133 , 341-350 .
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Optimization method for the porous volumetric solar receiver coupling genetic algorithm and heat transfer analysis EI SCIE Scopus
期刊论文 | 2018 , 122 , 383-390 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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The porous volumetric solar receiver shows advantages such as the volumetric absorption of solar radiation and the enhanced convective heat transfer. However, few studies were focused on the selection of the appropriate parameters of the receiver to improve its performance. In this contribution, an optimization method which couples the genetic algorithm and the heat transfer analysis of the porous volumetric solar receiver is proposed. The fluid flow and heat transfer in the receiver are evaluated by the volume averaging simulation method based on the local thermal non-equilibrium model. By combining with the genetic algorithm, the solar receiver with high thermal efficiency and low flow resistance could be identified. The single-objective optimization results present that larger porosity and higher inlet velocity are preferable to improve the thermal efficiency of the porous volumetric solar receiver. The optimized pore size increases with the increase of the thickness of the receiver and the decrease of the inlet velocity. Meanwhile, the porosity and the pore size are optimized simultaneously through the multi-objective optimization. The Pareto front which indicates the receiver with relatively lower flow resistance and relatively higher thermal efficiency is derived. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Porous volumetric solar receiver Multi-objective optimization Local thermal non-equilibrium Optimization design Genetic algorithm

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GB/T 7714 Du, Shen , He, Ya-Ling , Yang, Wei-Wei et al. Optimization method for the porous volumetric solar receiver coupling genetic algorithm and heat transfer analysis [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 122 : 383-390 .
MLA Du, Shen et al. "Optimization method for the porous volumetric solar receiver coupling genetic algorithm and heat transfer analysis" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 122 (2018) : 383-390 .
APA Du, Shen , He, Ya-Ling , Yang, Wei-Wei , Liu, Zhan-Bin . Optimization method for the porous volumetric solar receiver coupling genetic algorithm and heat transfer analysis . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2018 , 122 , 383-390 .
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A detailed study on phonon transport in thin silicon membranes with phononic crystal nanostructures EI SCIE Scopus
期刊论文 | 2018 , 227 , 731-741 | APPLIED ENERGY
WoS CC Cited Count: 4 SCOPUS Cited Count: 6
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Abstract :

A common method to improve thermoelectric performance is to reduce thermal conductivity by enhancing phonon scattering. In this paper, a frequency-dependent phonon radiative transport equation (PRTE) solver, based on the discrete ordinates method, is developed to simulate phonon transport in thin silicon membranes with phononic crystal nanostructures. The influence of geometric parameters on phonon transport is discussed in detail. Besides, a nonlinear regression model is attained for predicting the thermal conductivity of thin silicon membranes with phononic crystal nanostructures using the non-linear least-squares method. The results indicate that thermal conductivity is reduced by phononic crystal nanostructures mainly due to the back scattering of phonons with pore boundaries, and phonons with larger mean free path have stronger back scattering. When the pore placement is fixed, pore configuration affects phonon transport in thin silicon membranes with phononic crystal nanostructures. In addition, thermal conductivity is primarily controlled by three geometric parameters, including r(perpendicular to), r(parallel to), and A(u). Moreover, the obtained regression model reveals the relationship between thermal conductivity and geometric parameters well, which can offer useful suggestions for fabricating thin silicon membranes with low thermal conductivity.

Keyword :

Boltzmann transport equation Phonon transport Discrete ordinates method Phononic crystal nanostructures Lattice thermal conductivity

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GB/T 7714 Liang, Qi , He, Ya-Ling , Ren, Qinlong et al. A detailed study on phonon transport in thin silicon membranes with phononic crystal nanostructures [J]. | APPLIED ENERGY , 2018 , 227 : 731-741 .
MLA Liang, Qi et al. "A detailed study on phonon transport in thin silicon membranes with phononic crystal nanostructures" . | APPLIED ENERGY 227 (2018) : 731-741 .
APA Liang, Qi , He, Ya-Ling , Ren, Qinlong , Zhou, Yi-Peng , Xie, Tao . A detailed study on phonon transport in thin silicon membranes with phononic crystal nanostructures . | APPLIED ENERGY , 2018 , 227 , 731-741 .
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