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学者姓名:何雅玲

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< Page ,Total 106 >
Numerical study of SALSCS demonstration unit in Xi 'an, China, with non-uniform solar irradiation EI SCIE
期刊论文 | 2021 , 173 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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Abstract :

Solar-Assisted Large-Scale Cleaning System (SALSCS) is a new attempt to alleviate outdoor air pollution by using solar energy. A demonstration unit was built in Xi'an, China, in 2016. Field tests and numerical simulations were carried out on the demonstration unit in January 2017. Results show that the thermal airflow rate of the south collector is well predicted, while that of the north collector is seriously overestimated, with a deviation between the simulated value and the measured value being as larger as 47.07%. In this paper, an improved numerical simulation method considering the non-uniformity of solar irradiation, the effects of weather condition and the photovoltaic panels of the collector top is presented. Simulation results show that the deviation between the simulated thermal airflow rate of the north collector and the measured value is only 2.13%. Photovoltaic panels on the collector top have a little influence on the thermal airflow rate of the collectors. If the roof of the north and south collectors is covered with all photovoltaic panels, the thermal airflow rate will be reduced only by 6.93% and 7.99%, respectively. (C) 2021 Elsevier Ltd. All rights reserved.

Keyword :

PV CFD Solar chimney Non-uniform solar radiation Solar-assisted large-scale cleaning system

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GB/T 7714 Huang, Ming-Hua , He, Ya-Ling , Feng, Zhen-Ping et al. Numerical study of SALSCS demonstration unit in Xi 'an, China, with non-uniform solar irradiation [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 173 .
MLA Huang, Ming-Hua et al. "Numerical study of SALSCS demonstration unit in Xi 'an, China, with non-uniform solar irradiation" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 173 (2021) .
APA Huang, Ming-Hua , He, Ya-Ling , Feng, Zhen-Ping , Cao, Jun-Ji , Tao, Wen-Quan . Numerical study of SALSCS demonstration unit in Xi 'an, China, with non-uniform solar irradiation . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 173 .
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Thermodynamic and parametric analyses of a thermoelectric generator in a liquid air energy storage system EI SCIE
期刊论文 | 2021 , 237 | ENERGY CONVERSION AND MANAGEMENT
WoS CC Cited Count: 2
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Abstract :

A thermoelectric generator was applied to the liquid air energy storage system to utilize the excess heat, whereas their coupled thermodynamic characteristics were rarely reported. This article conducted the thermodynamic and parametric analyses on system performance in detail. The effects of the hot water mass flow and outlet temperature of thermoelectric generator, the discharging pressure, and stages of expansion on the performance were investigated. The results showed that the hot water outlet temperature had significant impact on the thermoelectric and energetic characteristics. The optimal hot water outlet temperature of 60?80 ?C and discharging pressure of around 16 MPa improved the efficiency by 1.7%. In addition, two different configurations of the thermoelectric generator were presented based on the effective cold energy utilization of the air turbine exhaust. The economic analysis indicated that compared with the organic Rankine cycle and Kalina cycle, the use of thermoelectric generator had economic advantage with a payback period of 2.99 years at an investment cost of $10703.

Keyword :

Economic analysis Waste heat recovery Thermodynamic Thermoelectric Liquid air energy storage

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GB/T 7714 Liu, Qingshan , He, Zhilong , Liu, Yingwen et al. Thermodynamic and parametric analyses of a thermoelectric generator in a liquid air energy storage system [J]. | ENERGY CONVERSION AND MANAGEMENT , 2021 , 237 .
MLA Liu, Qingshan et al. "Thermodynamic and parametric analyses of a thermoelectric generator in a liquid air energy storage system" . | ENERGY CONVERSION AND MANAGEMENT 237 (2021) .
APA Liu, Qingshan , He, Zhilong , Liu, Yingwen , He, Yaling . Thermodynamic and parametric analyses of a thermoelectric generator in a liquid air energy storage system . | ENERGY CONVERSION AND MANAGEMENT , 2021 , 237 .
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Numerical investigation of transient phase-change transpiration cooling based on variable properties of coolant EI SCIE
期刊论文 | 2021 , 184 | Applied Thermal Engineering
WoS CC Cited Count: 1
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Aimed at promoting the practical application of transpiration cooling technology in the field of active thermal protective system of hypersonic vehicles, this study presents a comprehensive numerical approach combining two-phase mixture model (TPMM), local thermal non-equilibrium (LTNE) assumption and variable properties of coolant to investigate the transient transpiration cooling problems with phase change. The real variable physical properties of coolant as functions of temperature and pressure are taken into consideration based on the data from the National Institute of Standards and Technology (NIST). The model is verified by comparing with the numerical and experimental data in previous researches. Results suggest that a new phenomenon of 'reverse temperature distribution' in two-phase region is observed in the transient simulation considering variable properties. Comparison between the constant-property model and variable-property model indicates the necessity of the real variable physical properties, especially at low-pressure conditions with large differential pressure gradient. Meanwhile, the simulation with a non-uniform heat flux boundary condition reveals the mechanism of heat transfer deterioration. A gap of liquid outflow is formed after vapor generation, next moves along the outlet, then disappears and finally regenerates. The non-uniform heat flux will certainly lead to an uneven pressure distribution, resulting in the deterioration of local heat transfer in the porous matrix. © 2020 Elsevier Ltd

Keyword :

Heat flux Hypersonic vehicles Physical properties Transpiration Real variables Coolants Pressure Deterioration

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GB/T 7714 Chen, Yu , Du, Shen , Li, Dong et al. Numerical investigation of transient phase-change transpiration cooling based on variable properties of coolant [J]. | Applied Thermal Engineering , 2021 , 184 .
MLA Chen, Yu et al. "Numerical investigation of transient phase-change transpiration cooling based on variable properties of coolant" . | Applied Thermal Engineering 184 (2021) .
APA Chen, Yu , Du, Shen , Li, Dong , Gao, Yang , He, Ya-Ling . Numerical investigation of transient phase-change transpiration cooling based on variable properties of coolant . | Applied Thermal Engineering , 2021 , 184 .
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Study on the thermal insulation property of SiO2aerogel influenced by the phenolic resin pyrolysis gas permeation EI
期刊论文 | 2021 , 52 (13) , 55-72 | Heat Transfer Research
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Abstract :

Phenolic resin is commonly used as the adhesive to strengthen the SiO2 aerogel thermal insulator on the aerospace vehicle. However, the pyrolysis of phenolic resin adhesives would alter the thermal insulation property of the SiO2 aerogel. In this research, experimental and numerical methods are adopted to investigate the influence of the pyrolysis gas on the heat transfer in the SiO2 aerogel. The results demonstrate that the gas convection is suppressed by the nanoporous structure of the SiO2 aerogel, but the pyrolysis gas of the adhesive would still significantly reduce the thermal insulation property of the SiO2 aerogel, and the thermal insulation property of the SiO2 aerogel would be seriously deteriorated, with the increasing amount of the phenolic resin used. As the operating pressure increases, the influence of the pyrolysis gas permeation on the heat transfer in the SiO2 aerogel is moderated due to the increasing of the density of gas stored in the SiO2 aerogel. The thermal insulation property of the SiO2 aerogel-based thermal insulation system becomes better at higher operating pressure conditions. © 2021 by Begell House, Inc.

Keyword :

Aerogels Gases Thermal insulation Adhesives Silicon Numerical methods Phenolic resins Silica Density of gases Resins Heat transfer Pyrolysis

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GB/T 7714 Dai, Jia-Peng , Li, Dong , Du, Shen et al. Study on the thermal insulation property of SiO2aerogel influenced by the phenolic resin pyrolysis gas permeation [J]. | Heat Transfer Research , 2021 , 52 (13) : 55-72 .
MLA Dai, Jia-Peng et al. "Study on the thermal insulation property of SiO2aerogel influenced by the phenolic resin pyrolysis gas permeation" . | Heat Transfer Research 52 . 13 (2021) : 55-72 .
APA Dai, Jia-Peng , Li, Dong , Du, Shen , Cao, Zhan-Wei , Xu, Xiao-Liang , He, Ya-Ling . Study on the thermal insulation property of SiO2aerogel influenced by the phenolic resin pyrolysis gas permeation . | Heat Transfer Research , 2021 , 52 (13) , 55-72 .
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Manipulating thermal conductivity of silicon nanowires through surrounded fins and Ge dopant EI SCIE
期刊论文 | 2021 , 176 | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
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Abstract :

Manipulating the phonon transport using nanotechnologies is one of the commonly adopted ways to reduce the thermal conductivity and enhance the thermoelectric performance of thermoelectric materials. In this work, we proposed a resonant structure, surrounded fins, for Si nanowires. The effects of both surrounded fins and Ge dopant on the thermal transport in Si NWs are studied using the molecular dynamics simulations. The root-mean-square (RMS) displacement, phonon dispersion, density of states and transmission function have been calculated to understand the thermal conductivity reduction in Si NWs. The calculated results show that both the surrounded fins and Ge dopants could significantly decrease the thermal conductivity of Si NWs. The thermal conductivity of finned Si NWs decreases with increasing the height of the surrounded fins. The more surrounded fins added, the more significant the thermal conductivity decreases. The thermal conductivity of SiGe NWs decreases initially and then increases with increasing Ge concentration. Through the analysis of RMS displacement and phonon dispersion, we found that surround fins could not only enhance anharmonicity by activating atoms near to the edge, but also increase the low frequency phonons and decrease the group velocities by modifying phonon dispersion relationship. The phonon transmission function suggests that the surrounded fins and Ge dopants would mainly suppress the transport of low-frequency and high-frequency phonons, respectively. Phonon transport in Si NWs could be suppressed over the whole frequency range by combining the surrounded fins and Ge dopants. Our results provide useful guidance in the design of efficient thermoelectric devices made of nanowires. (C) 2021 Elsevier Ltd. All rights reserved.

Keyword :

Si nanowire Thermoelectric devices Resonant structures Ge dopant Blocking phonon transport

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GB/T 7714 Liang, Qi , He, Ya-Ling , Hung, Tzu-Chen . Manipulating thermal conductivity of silicon nanowires through surrounded fins and Ge dopant [J]. | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 176 .
MLA Liang, Qi et al. "Manipulating thermal conductivity of silicon nanowires through surrounded fins and Ge dopant" . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER 176 (2021) .
APA Liang, Qi , He, Ya-Ling , Hung, Tzu-Chen . Manipulating thermal conductivity of silicon nanowires through surrounded fins and Ge dopant . | INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER , 2021 , 176 .
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Experimental and techno-economic analysis of transcritical CO2 heat pump water heater with fin-and-tube and microchannel heat exchanger EI SCIE
期刊论文 | 2021 , 199 | APPLIED THERMAL ENGINEERING
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Abstract :

Previously, the conventional fin-and-tube heat exchanger is usually chosen as the evaporator in the air source heat pump. Recently, with the higher heat transfer efficiency, the microchannel heat exchanger is increasingly recognized. Nevertheless, information available in the contrastive analysis of the two heat exchanger types is scarce. Therefore, the effect of the mentioned evaporator type on the air source transcritical CO2 heat pump was experimentally studied in this paper. Then, with the detailed techno-economic analysis methods, the heat pump with different heat exchangers is evaluated from multiple perspectives. Results showed the heating capacity and coefficient of performance of the microchannel system were increased by 16.5%-37.3% and 16.3%-22.6%, compared with the baseline fin-and-tube system. However, the attenuation degree of heating capacity was more obvious in the fin-and-tube system under the frosting condition. The primary energy consumption, CO2 emission and corresponding cost of microchannel system are declined by 6.28 tce, 14.4 tons and 77.6 dollars for the comparison with the fin-and-tube system. The maximum values are all presented by direct electric heater whereas the minimum life cycle cost is achieved by coal-fired boiler. The life cycle cost and sensitivity analysis with unit electricity price are also conducted in the economic analysis.

Keyword :

Transcritical CO2 heat pump Frosting Fin-and-tube heat exchanger Sensitivity analysis Microchannel heat exchanger Techno-economic analysis

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GB/T 7714 Wang, Yikai , Zong, Shuo , Song, Yulong et al. Experimental and techno-economic analysis of transcritical CO2 heat pump water heater with fin-and-tube and microchannel heat exchanger [J]. | APPLIED THERMAL ENGINEERING , 2021 , 199 .
MLA Wang, Yikai et al. "Experimental and techno-economic analysis of transcritical CO2 heat pump water heater with fin-and-tube and microchannel heat exchanger" . | APPLIED THERMAL ENGINEERING 199 (2021) .
APA Wang, Yikai , Zong, Shuo , Song, Yulong , Cao, Feng , He, Yaling , Gao, Qiang . Experimental and techno-economic analysis of transcritical CO2 heat pump water heater with fin-and-tube and microchannel heat exchanger . | APPLIED THERMAL ENGINEERING , 2021 , 199 .
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Field synergy principle: Its scientific beauty and relationship with entransy theory EI
期刊论文 | 2021 , 51 (10) , 1155-1165 | Scientia Sinica Technologica
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Abstract :

From the six aspects of the beauty of science, this paper analyzes and discusses the beauty of the science of the field synergy principle (FSP) proposed by Guo. Its clear concept, elegant derivation, and wide application are analyzed. Its naturality, symmetry, and analogy are discussed. Finally, the inherent relationship between FSP and entransy theory is revealed. The paper shows that FSP and entransy theory prove and complement each other, and thus both play important roles in improving and promoting the development of knowledge of heat transfer. © 2021, Science Press. All right reserved.

Keyword :

Heat transfer

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GB/T 7714 Tao, Wenquan , He, Yaling . Field synergy principle: Its scientific beauty and relationship with entransy theory [J]. | Scientia Sinica Technologica , 2021 , 51 (10) : 1155-1165 .
MLA Tao, Wenquan et al. "Field synergy principle: Its scientific beauty and relationship with entransy theory" . | Scientia Sinica Technologica 51 . 10 (2021) : 1155-1165 .
APA Tao, Wenquan , He, Yaling . Field synergy principle: Its scientific beauty and relationship with entransy theory . | Scientia Sinica Technologica , 2021 , 51 (10) , 1155-1165 .
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Conceptual design of porous volumetric solar receiver using molten salt as heat transfer fluid EI SCIE
期刊论文 | 2021 , 301 | APPLIED ENERGY
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Thermal radiation loss hinders the high-efficient operation of solar receiver at high temperature. Porous volumetric solar receiver using molten salt instead of air as heat transfer fluid is proposed. A comprehensive literature review is done to investigate the optical and radiative properties of molten in solar and infrared spectra. Direct pore-scale numerical simulation method based on X-ray computed tomography technique is applied to compare the fluid flow and heat transfer performance of molten salt and air porous volumetric solar receiver. The results present that some types of molten salts behave to be transparent in solar spectrum and opaque in infrared spectrum, which allow the penetration of solar radiation while strongly absorb the infrared emission in the receiver. The thermal efficiency of Hitec porous volumetric solar receiver is higher than traditional air porous receiver especially at higher working temperature, and it is improved by 9.6% at receiver's outlet temperature of 1000 K. Due to its large heat storage capability and efficient convective heat transfer, small mass flow rate is required in the molten salt receiver to absorb solar radiation, which leads to orders-magnitude smaller pressure drop for the Hitec porous receiver. Further research related to this type of porous volumetric solar receiver is outlined with respect to experiment verification and application of high temperature molten salt.

Keyword :

Volumetric solar receiver Pore-scale numerical simulation Flow resistance Thermal radiation loss Porous media Molten salt

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GB/T 7714 Du, Shen , Li, Ming-Jia , He, Ya-Ling et al. Conceptual design of porous volumetric solar receiver using molten salt as heat transfer fluid [J]. | APPLIED ENERGY , 2021 , 301 .
MLA Du, Shen et al. "Conceptual design of porous volumetric solar receiver using molten salt as heat transfer fluid" . | APPLIED ENERGY 301 (2021) .
APA Du, Shen , Li, Ming-Jia , He, Ya-Ling , Shen, Sheng . Conceptual design of porous volumetric solar receiver using molten salt as heat transfer fluid . | APPLIED ENERGY , 2021 , 301 .
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Release of methane from nanochannels through displacement using CO2 EI SCIE
期刊论文 | 2021 , 11 (25) , 15457-15466 | RSC ADVANCES
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In this work, we investigate the release of methane in quartz nanochannels through the method of displacement using carbon dioxide. Molecular dynamics (MD) simulations and theoretical analysis are performed to obtain the release percentage of methane for nanochannels of various diameters. It is found that both the pressure of CO2 and the channel size affect the release percentage of methane, which increases with increasing pressure of CO2 and channel diameter. Without CO2, the majority of methane molecules are adsorbed by the channel surface. When CO2 is injected into the channel, CO2 molecules replace many methane molecules due to the relatively strong molecular interactions between CO2 and the channel, which leads to the desorption of methane, reduces the energy barrier for the transport of methane, and consequently increases the release rate. Theoretical predictions using the kinetic energy of methane and the energy barrier inside the channel are also conducted, which are in good agreement with the MD simulations.

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GB/T 7714 Cheng, Xu , Li, Zhigang , He, Ya-Ling . Release of methane from nanochannels through displacement using CO2 [J]. | RSC ADVANCES , 2021 , 11 (25) : 15457-15466 .
MLA Cheng, Xu et al. "Release of methane from nanochannels through displacement using CO2" . | RSC ADVANCES 11 . 25 (2021) : 15457-15466 .
APA Cheng, Xu , Li, Zhigang , He, Ya-Ling . Release of methane from nanochannels through displacement using CO2 . | RSC ADVANCES , 2021 , 11 (25) , 15457-15466 .
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Sandwich-like multi-scale hierarchical porous carbon with a highly hydroxylated surface for flow batteries EI SCIE
期刊论文 | 2021 , 9 (4) , 2345-2356 | Journal of Materials Chemistry A
WoS CC Cited Count: 4
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High reaction activity and cycling stability are essential to commercialize electrodes for vanadium flow batteries (VFBs) and zinc-bromine flow batteries (ZBFBs). In this work, a sandwich-like multi-scale pore-rich hydroxylated carbon (SPHC), which is made of a highly activated porous middle layer assembled between a pair of protuberance-rich compact outer layers, was proposed and developed to meet both the redox reactions and the mass-charge transport in flow batteries. In this SPHC, (i) the middle layer with the pore-opened integrated structure provides abundant active sites for redox reactions, (ii) the outer layer with a compact surface protects the inside pores against the electrolyte flow, and (iii) the even-distributed protuberances in the outer layer further increase the number of reaction sites. Due to the sandwich-like porous structure that possesses abundant hydroxyl functional groups (25.3%) and a high specific surface area (313.2 m2g−1), the SPHC demonstrates both high electrochemical activity and stability towards vanadium and bromine redox reactions. Additionally, the SPHC-based electrode yields energy efficiencies as high as 77.8% at 200 mA cm−2in VFBs and 76.1% at 80 mA cm−2in ZBFBs, 28.3% and 8.2% higher than that of a pristine electrode, respectively. More impressively, the SPHC electrode in VFBs has an ultra-low energy efficiency decay of 0.0025% per cycle for over 500 charge-discharge cycles. This work provides a promising approach to develop a high-activity and high-stability electrode that enables great potential applications in flow batteries and other electrochemical energy storage systems. © The Royal Society of Chemistry 2021.

Keyword :

Flow batteries Hydroxylation Bromine Redox reactions Electric discharges Electrochemical electrodes Porous materials Energy storage Carbon Energy efficiency Vanadium Electrolytes

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GB/T 7714 Wang, Rui , Li, Yinshi , Liu, Haiying et al. Sandwich-like multi-scale hierarchical porous carbon with a highly hydroxylated surface for flow batteries [J]. | Journal of Materials Chemistry A , 2021 , 9 (4) : 2345-2356 .
MLA Wang, Rui et al. "Sandwich-like multi-scale hierarchical porous carbon with a highly hydroxylated surface for flow batteries" . | Journal of Materials Chemistry A 9 . 4 (2021) : 2345-2356 .
APA Wang, Rui , Li, Yinshi , Liu, Haiying , He, Ya-Ling , Hao, Mingsheng . Sandwich-like multi-scale hierarchical porous carbon with a highly hydroxylated surface for flow batteries . | Journal of Materials Chemistry A , 2021 , 9 (4) , 2345-2356 .
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