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< Page ,Total 94 >
Experimental investigation of lubricant oil on a 3 kW organic Rankine cycle (ORC) using R123 SCIE
期刊论文 | 2019 , 182 , 340-350 | ENERGY CONVERSION AND MANAGEMENT
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Abstract :

The lubricant oil can prevent the leakages and reduce the expander friction losses, but blend with the pure working fluid because of the absence of oil separator and affect eventually the organic Rankine cycle (ORC) operation characteristic. Based on a 3 kW ORC experimental prototype, the effect of lubricant oil ratio (1.2%, 3.1%, 5.0%, 6.7% and 9.0%) using R123 on the system behavior under three different degree of superheating (5, 10 and 15 degrees C) has been investigated. The heat source temperature is fixed at 130 degrees C, while the mass flow rate is controlled by adjusting the pump frequency. The heat input is first amended, and the detailed components' behaviors are examined. The system overall performance, including thermal efficiency and system generating efficiency is explored. Results demonstrated that the deviation between the calculated heat input and modified heat input is no more than 5%. The lubricant oil enhances the pump behavior, whereas deteriorates the expander shaft power and electrical power. Meanwhile, the thermal efficiency is insensitive on the lubricant oil ratio for a degree of superheating higher than 10 degrees C. The system generating efficiencies for degree of superheating of 10 and 15 degrees C are in range of 5.44-5.61% (3.03%) and 5.34-5.69% (6.15%), respectively.

Keyword :

Thermal efficiency Lubricant oil ratio System generating efficiency Organic Rankine cycle (ORC) Degree of superheating

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GB/T 7714 Feng, Yong-qiang , Hung, Tzu-Chen , He, Ya-Ling et al. Experimental investigation of lubricant oil on a 3 kW organic Rankine cycle (ORC) using R123 [J]. | ENERGY CONVERSION AND MANAGEMENT , 2019 , 182 : 340-350 .
MLA Feng, Yong-qiang et al. "Experimental investigation of lubricant oil on a 3 kW organic Rankine cycle (ORC) using R123" . | ENERGY CONVERSION AND MANAGEMENT 182 (2019) : 340-350 .
APA Feng, Yong-qiang , Hung, Tzu-Chen , He, Ya-Ling , Wang, Qian , Chen, Shih-Chi , Wu, Shang-Lun et al. Experimental investigation of lubricant oil on a 3 kW organic Rankine cycle (ORC) using R123 . | ENERGY CONVERSION AND MANAGEMENT , 2019 , 182 , 340-350 .
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Multi-physics coupling effects of nanostructure characteristics on the all-back-contact silicon solar cell performances EI SCIE
期刊论文 | 2019 , 236 , 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 , 236 : 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 236 (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 , 236 , 127-136 .
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Review of the solar flux distribution in concentrated solar power: Non-uniform features, challenges, and solutions EI SCIE
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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Transient characteristics of a parabolic trough direct-steam generation process SCIE
期刊论文 | 2019 , 135 , 800-810 | RENEWABLE ENERGY
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Abstract :

Solar-powered direct steam generation (DSG) is attractive for power generation and industrial utilization due to the combination of renewable-energy source and clean energy carrier. An improved SIMPLE algorithm ensuring the dual roles of pressure acting on velocity and density fields is developed to realize thermo-hydraulic completely-coupled modeling of a typical DSG loop with transient phase-change and multiple flow-patterns. The excitation-response characteristics of the loop were investigated under various step-variations of direct normal irradiance (DNI), inlet mass fiowrate (m(in)) and inlet temperature (t(in)). Increasing DNI (decreasing m(in)) is found to narrow the preheating-evaporation regions and expand the superheating region, and vice versa. While under step-variations of t(in), the evaporation region almost remains unchanged (about 403 m). The water slides to a lower temperature faster than climbs to a higher one under variations of DN1 (up to 670s vs. 2960s) and m(in) (up to 1184s vs. 4420s), simultaneously the outlet temperature (t(out)) staying a monotonical response-trend. However, under t(in) variations, t(out) holds a higher-order trait. The responses of both pressure and velocity are tightly coupled and always hold higher-order trait. The response time of the total mass in the loop is almost 2.5 to 5.5 times as fast as t(out). (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Transient characteristics Solar energy SIMPLE algorithm Direct steam generation (DSG) Concentrating solar power (CSP)

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GB/T 7714 Li, Lu , Sun, Jie , Li, Yinshi et al. Transient characteristics of a parabolic trough direct-steam generation process [J]. | RENEWABLE ENERGY , 2019 , 135 : 800-810 .
MLA Li, Lu et al. "Transient characteristics of a parabolic trough direct-steam generation process" . | RENEWABLE ENERGY 135 (2019) : 800-810 .
APA Li, Lu , Sun, Jie , Li, Yinshi , He, Ya-Ling , Xu, Haojie . Transient characteristics of a parabolic trough direct-steam generation process . | RENEWABLE ENERGY , 2019 , 135 , 800-810 .
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Tomography-based determination of Nusselt number correlation for the porous volumetric solar receiver with different geometrical parameters SCIE
期刊论文 | 2019 , 135 , 711-718 | RENEWABLE ENERGY
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Abstract :

Pore-scale numerical models of the porous volumetric solar receiver are established in this paper. By using the X-ray computed tomography and the imaging processing techniques, models of porous media with different geometrical parameters are reconstructed. The conjugate heat transfer process in the porous volumetric solar receiver is solved based on the direct pore-scale numerical simulation. The turbulent effect of fluid flow inside porous geometry is considered by the Shear-Stress Transport k-w model and the absorbed solar energy is simulated by following the Beer's law. The results present that the inlet velocity and the geometrical parameters influence the thermal performance of the porous volumetric solar receiver. Larger inlet velocity tends to enhance the convective heat transfer between fluid and solid phases meanwhile decreases noticeably the overall temperature. Receiver with larger porosity is preferred because it limits the reflection losses. The Nusselt number increases as the porosity becomes larger. As a result, the general correlation of Nusselt number for the porous volumetric solar receiver is derived as a function of porosity and Reynolds number. This correlation is applicable with the porosity ranging from 0.74 to 0.89 and the pore Reynolds number ranging from 3 to 233. (C) 2018 Elsevier Ltd. All rights reserved.

Keyword :

Solar energy Porous media Convective heat transfer Volumetric solar receiver Pore-scale numerical simulation Nusselt number correlation

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GB/T 7714 Du, Shen , Tong, Zi-Xiang , Zhang, Hong-Hu et al. Tomography-based determination of Nusselt number correlation for the porous volumetric solar receiver with different geometrical parameters [J]. | RENEWABLE ENERGY , 2019 , 135 : 711-718 .
MLA Du, Shen et al. "Tomography-based determination of Nusselt number correlation for the porous volumetric solar receiver with different geometrical parameters" . | RENEWABLE ENERGY 135 (2019) : 711-718 .
APA Du, Shen , Tong, Zi-Xiang , Zhang, Hong-Hu , He, Ya-Ling . Tomography-based determination of Nusselt number correlation for the porous volumetric solar receiver with different geometrical parameters . | RENEWABLE ENERGY , 2019 , 135 , 711-718 .
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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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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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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
SCOPUS Cited Count: 1
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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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Transient response of waste heat recovery system for hydrogen production and other renewable energy utilization EI Scopus
期刊论文 | 2018 | International Journal of Hydrogen Energy
SCOPUS Cited Count: 3
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Abstract :

In this paper, a 1 kW ORC experimental system is built. Using R123 as the working fluid, transient responses of Basic ORC (BORC) and ORC with a regenerator (RORC) are both tested under critical conditions. A total of four experiments are carried out, including: (1) Case 1: the working fluid pump is suddenly shut down; (2) Case 2: the working fluid is overfilled or underfilled; (3) Case 3: the torque of the expander is suddenly loss. (4) Case 4: the cooling water pump is suddenly shut down. All the major quantities such as the output power and torque of the expander, temperatures and pressures at the inlet and outlet of the expander, temperatures at the inlet and outlet of the condenser are measured. The transient responses of the two systems under the controlled critical conditions are tested and compared, some physical explanations are provided. It is found that RORC is more stable than BORC because of the regenerator. Regenerator should act as a “pre-heater” or “pre-cooler” under the critical conditions thus improving the stability of RORC. When the working fluid in the system is underfilled or leaked, the system performance is extremely unstable. Otherwise, when the working fluid is overfilled, the trend of the curves are similar to the optimal working condition but with weaker performances. We also find that if the working fluid pump is shut down when working fluid is overfilled, the rotation speed and shaft power output of the expander will increase significantly, the unique phenomenon can be used to estimate whether the working fluid in the system is overfilled. © 2018 Hydrogen Energy Publications LLC

Keyword :

Critical condition Experimental system Organic Rankine Cycle(ORC) Output power Rotation speed Shaft power Waste heat recovery systems Working fluid

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GB/T 7714 Xi, Huan , He, Ya-Ling , Wang, Jinhua et al. Transient response of waste heat recovery system for hydrogen production and other renewable energy utilization [J]. | International Journal of Hydrogen Energy , 2018 .
MLA Xi, Huan et al. "Transient response of waste heat recovery system for hydrogen production and other renewable energy utilization" . | International Journal of Hydrogen Energy (2018) .
APA Xi, Huan , He, Ya-Ling , Wang, Jinhua , Huang, Zuohua . Transient response of waste heat recovery system for hydrogen production and other renewable energy utilization . | International Journal of Hydrogen Energy , 2018 .
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HEAT STORAGE PERFORMANCE RESEARCH OF A NOVEL MULTI-LAYERED PACKED-BED THERMOCLINE TANK EI
期刊论文 | 2018 , 39 (8) , 2226-2233 | Taiyangneng Xuebao/Acta Energiae Solaris Sinica
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In this paper, a transient, two-dimensional, axisymmetric porous medium model was developed for analyzing the effects of thermocline thickness on the thermal performance of a packed-bed molten salt thermocline tank. Based on the model, the effects of the filler's thermal physical properties, including the heat capacity and conductivity, were investigated. And the variations of thermocline thickness and performance of tanks using five fillers were compared. Based on the above results, a novel multi-layered packed-bed molten salt thermocline tank was designed for controlling the thermocline expansion. An increase of 27.09% in useful thermal energy with a drop of 0.64% in thermal efficiency was observed in the quartzite-cast iron-high temperature concrete three-layered thermocline tank compared with that of traditional quartzite single-layered thermocline tank. © 2018, Editorial Board of Acta Energiae Solaris Sinica. All right reserved.

Keyword :

High temperature concretes Multi-layered Porous medium model Storage performance Thermal efficiency Thermal Performance Thermal storage Thermal-physical property

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GB/T 7714 Li, Mengjie , Qiu, Yu , He, Yaling . HEAT STORAGE PERFORMANCE RESEARCH OF A NOVEL MULTI-LAYERED PACKED-BED THERMOCLINE TANK [J]. | Taiyangneng Xuebao/Acta Energiae Solaris Sinica , 2018 , 39 (8) : 2226-2233 .
MLA Li, Mengjie et al. "HEAT STORAGE PERFORMANCE RESEARCH OF A NOVEL MULTI-LAYERED PACKED-BED THERMOCLINE TANK" . | Taiyangneng Xuebao/Acta Energiae Solaris Sinica 39 . 8 (2018) : 2226-2233 .
APA Li, Mengjie , Qiu, Yu , He, Yaling . HEAT STORAGE PERFORMANCE RESEARCH OF A NOVEL MULTI-LAYERED PACKED-BED THERMOCLINE TANK . | Taiyangneng Xuebao/Acta Energiae Solaris Sinica , 2018 , 39 (8) , 2226-2233 .
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