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学者姓名:吴玉庭
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Abstract :
压缩空气储能具有寿命长、成本低、环境污染小等优点而备受关注,然而压缩空气储能系统存在能量密度和效率低的问题,本工作提出了气动马达并联工作模式以提高压缩空气储能系统的输出功率、能量转换效率和经济性。通过对比分析了在气动马达并联工作和单独工作时,关键参数变化对气动马达输出功率、经济性和能量转换效率的影响规律。为了将微型压缩空气储能系统的膨胀机和压缩机一体化,本工作研究了气动马达正转和反转的性能。气动马达既作为膨胀机又作为压缩机,可以双模式运行,提高设备的利用率,降低压缩空气储能系统的成本。与可再生能源发电相结合的应用场景中,变工况运行是压缩空气储能系统面临的一个关键问题。以储气罐压力变化和负荷需求波动为代表的多种变工况条件在系统运行过程中常常同时存在,本工作在变工况条件下,通过试验研究了关键因素对压缩空气储能系统性能的影响情况。试验结果表明,采用气动马达并联工作模式可以提高压缩空气储能系统的输出功率、能量转换效率和经济性。当进气压力为10.5 bar(1 bar=100 kPa)时,气动马达和发电机输出功率的最大值约为660 W和380 W。
Keyword :
输出功率 输出功率 并联模式 并联模式 压缩空气储能系统 压缩空气储能系统 气动马达 气动马达
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GB/T 7714 | 许永红 , 吴玉庭 , 张红光 et al. 基于气动马达的微型压缩空气储能系统的试验研究 [J]. | 储能科学与技术 , 2023 , 12 (06) : 1854-1861 . |
MLA | 许永红 et al. "基于气动马达的微型压缩空气储能系统的试验研究" . | 储能科学与技术 12 . 06 (2023) : 1854-1861 . |
APA | 许永红 , 吴玉庭 , 张红光 , 杨富斌 , 王焱 . 基于气动马达的微型压缩空气储能系统的试验研究 . | 储能科学与技术 , 2023 , 12 (06) , 1854-1861 . |
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Abstract :
Molten salt is an excellent medium for heat transfer and storage. The unique microstructure of carbon nanomaterials leads to good mechanical stability, low density, high thermal conductivity, and high strength, etc. The addition of carbon nanomaterials to molten salt to form molten salt nanofluid can remarkably enhance the specific heat capacity and thermal conductivity of molten salt and reduce the molten salt viscosity, which is of great importance to increase the heat storage density and reduce the heat storage cost. Nevertheless, some challenges remain in the study of such nanofluids. The main challenge is the dispersion stability of carbon nanomaterials. Therefore, to improve research on carbon nanofluids, this paper summarizes the progress of carbon-based molten salt nanofluid research worldwide including the preparation methods of molten salt nanofluids, the improvement of heat transfer performance, and the improvement of heat storage performance. The effects of carbon nanoparticle concentration, size, and type on the heat transfer and storage performance of molten salt are derived, and the effects of nanoparticle shape on the heat transfer performance of molten salt are analyzed while more promising preparation methods for carbon-based molten salt nanofluids are proposed. In addition, the future problems that need to be solved for high-temperature molten salt-based carbon nanofluids are briefly discussed.
Keyword :
nanofluids nanofluids molten salt molten salt carbon materials carbon materials enhanced heat transfer enhanced heat transfer solar energy solar energy
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GB/T 7714 | Chen, Xia , Zhang, Mingxuan , Wu, Yuting et al. Advances in High-Temperature Molten Salt-Based Carbon Nanofluid Research [J]. | ENERGIES , 2023 , 16 (5) . |
MLA | Chen, Xia et al. "Advances in High-Temperature Molten Salt-Based Carbon Nanofluid Research" . | ENERGIES 16 . 5 (2023) . |
APA | Chen, Xia , Zhang, Mingxuan , Wu, Yuting , Ma, Chongfang . Advances in High-Temperature Molten Salt-Based Carbon Nanofluid Research . | ENERGIES , 2023 , 16 (5) . |
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Abstract :
压缩空气储能具有寿命长、成本低、环境污染小等优点而备受关注,然而压缩空气储能系统存在能量密度和效率低的问题,本工作提出了气动马达并联工作模式以提高压缩空气储能系统的输出功率、能量转换效率和经济性.通过对比分析了在气动马达并联工作和单独工作时,关键参数变化对气动马达输出功率、经济性和能量转换效率的影响规律.为了将微型压缩空气储能系统的膨胀机和压缩机一体化,本工作研究了气动马达正转和反转的性能.气动马达既作为膨胀机又作为压缩机,可以双模式运行,提高设备的利用率,降低压缩空气储能系统的成本.与可再生能源发电相结合的应用场景中,变工况运行是压缩空气储能系统面临的一个关键问题.以储气罐压力变化和负荷需求波动为代表的多种变工况条件在系统运行过程中常常同时存在,本工作在变工况条件下,通过试验研究了关键因素对压缩空气储能系统性能的影响情况.试验结果表明,采用气动马达并联工作模式可以提高压缩空气储能系统的输出功率、能量转换效率和经济性.当进气压力为10.5 bar(1 bar= 100 kPa)时,气动马达和发电机输出功率的最大值约为660 W和380 W.
Keyword :
气动马达 气动马达 压缩空气储能系统 压缩空气储能系统 并联模式 并联模式 输出功率 输出功率
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GB/T 7714 | 许永红 , 吴玉庭 , 张红光 et al. 基于气动马达的微型压缩空气储能系统的试验研究储能系统与工程 [J]. | 储能科学与技术 , 2023 , 12 (6) : 1854-1861 . |
MLA | 许永红 et al. "基于气动马达的微型压缩空气储能系统的试验研究储能系统与工程" . | 储能科学与技术 12 . 6 (2023) : 1854-1861 . |
APA | 许永红 , 吴玉庭 , 张红光 , 杨富斌 , 王焱 . 基于气动马达的微型压缩空气储能系统的试验研究储能系统与工程 . | 储能科学与技术 , 2023 , 12 (6) , 1854-1861 . |
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Abstract :
Vapor compression refrigeration is considered one promising technology for dissipating much higher heat fluxes from electronic devices at lower temperatures. The compressor, one key component, has a great effect on the overall size and performance of the system. One lightweight, miniature, hermetic Wankel compressor was developed to solve limited space cooling problems. The assembled Wankel compressor had a diameter of 65 mm, a length of 85 mm and a weight of 340.2 g, without a motor and housing. An experimental system for miniature refrigeration was set up to explore the optimal refrigerant charge and the performance of the compressor under changing rotational speeds and inlet temperatures of cooling water. The experimental results showed that the optimal refrigerant charge was 220 g and the coefficient of performance was approximately 2.8. The refrigeration coefficient of the system decreased with increases in rotational speed and inlet temperature of the cooling water at a stable cooling capacity of 100 W. The developed lightweight, miniature, hermetic Wankel compressor had reliable performance after running for 600 h, with a power consumption of 35 W and a high coefficient of performance (COP) of 2.63.
Keyword :
aerospace aerospace electronics cooling electronics cooling miniature compressor miniature compressor Wankel compressor Wankel compressor vapor compression refrigeration vapor compression refrigeration
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GB/T 7714 | Zhi, Ruiping , Ma, Rui , Zhang, Delou et al. Experimental Research on a Lightweight Miniature Wankel Compressor for a Vapor Compression Refrigeration System in Aerospace [J]. | SUSTAINABILITY , 2023 , 15 (11) . |
MLA | Zhi, Ruiping et al. "Experimental Research on a Lightweight Miniature Wankel Compressor for a Vapor Compression Refrigeration System in Aerospace" . | SUSTAINABILITY 15 . 11 (2023) . |
APA | Zhi, Ruiping , Ma, Rui , Zhang, Delou , Wu, Yuting . Experimental Research on a Lightweight Miniature Wankel Compressor for a Vapor Compression Refrigeration System in Aerospace . | SUSTAINABILITY , 2023 , 15 (11) . |
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Abstract :
针对有机朗肯循环系统参数之间的强耦合关系,本文在试验的基础上提出了一种基于机器学习模型的关键参数集识别方法.在一套 10 kW级的有机朗肯循环试验系统上开展了不同热源条件下的系统性能试验;选取蒸发器出口压力和温度、冷凝器入口压力和温度、工质泵效率和膨胀机轴效率6 个系统参数为初始变量,以ORC系统热效率为目标变量,分别建立了有机朗肯循环系统多元线性、人工神经网络和支持向量机机器学习模型;最终确定了有机朗肯循环系统最佳的机器学习模型和关键参数集.研究表明:采用关键参数集可以使模型的平均误差降低13.36%,提高了模型的准确度.高准确度的有机朗肯循环系统机器学习模型可以提高模型的预测性能,进而为实现有机朗肯循环系统高效运行控制提供支撑.
Keyword :
主成分分析 主成分分析 有机朗肯循环 有机朗肯循环 支持向量机 支持向量机 试验数据 试验数据 关键参数集 关键参数集 多元线性 多元线性 热效率 热效率 人工神经网络 人工神经网络
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GB/T 7714 | 闫栋 , 杨富斌 , 张红光 et al. 有机朗肯循环机器学习模型关键参数集识别 [J]. | 哈尔滨工程大学学报 , 2023 , 44 (8) : 1368-1374 . |
MLA | 闫栋 et al. "有机朗肯循环机器学习模型关键参数集识别" . | 哈尔滨工程大学学报 44 . 8 (2023) : 1368-1374 . |
APA | 闫栋 , 杨富斌 , 张红光 , 许永红 , 吴玉庭 . 有机朗肯循环机器学习模型关键参数集识别 . | 哈尔滨工程大学学报 , 2023 , 44 (8) , 1368-1374 . |
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Abstract :
As thermal energy storage and heat transfer material, molten salt is widely used in concentrating solar power (CSP) plant. The thermophysical properties of molten salt can be significantly changed by adding nanoparticles into molten salt. In this work, the heat transfer characteristics of quaternary mixed molten salt with SiO2 nanoparticles are experimentally studied. The results show that the heat transfer performance of molten salt based nanofluids is better than that of pure molten salt. The convection heat transfer coefficient and Nu number of molten salt based nanofluids are 22.34% and 11.42% higher than that of pure molten salt, respectively. The classical heat transfer correlation equations are not suitable for quaternary mixed molten salt based nanofluids. The heat transfer correlation of quaternary mixed molten salt based nanofluids is fitted, the maximum deviation between the experimental data and fitted heat transfer correlation of molten salt based nanofluids is 12%. This work could provide basic heat transfer data of molten salt based nanofluids for thermal energy storage application.
Keyword :
Thermal energy storage Thermal energy storage Molten salt Molten salt Heat transfer Heat transfer Nanofluids Nanofluids
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GB/T 7714 | Zhang, Cancan , Han, Songtao , Wu, Yuting et al. Investigation on convection heat transfer performance of quaternary mixed molten salt based nanofluids in smooth tube [J]. | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2022 , 177 . |
MLA | Zhang, Cancan et al. "Investigation on convection heat transfer performance of quaternary mixed molten salt based nanofluids in smooth tube" . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES 177 (2022) . |
APA | Zhang, Cancan , Han, Songtao , Wu, Yuting , Zhang, Chunyu , Guo, Hang . Investigation on convection heat transfer performance of quaternary mixed molten salt based nanofluids in smooth tube . | INTERNATIONAL JOURNAL OF THERMAL SCIENCES , 2022 , 177 . |
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Abstract :
Compressed air energy storage (CAES) is considered a promising energy storage technology because it promotes global energy saving, emission reduction, and the development of renewable energy. Improvement in the expander performance is a major concern in CAES systems. The addition of lubricant is beneficial for reducing leakage and friction losses, which can improve the expander performance and the CAES system efficiency. To clarify the influence of lubricant on the expander performance, a comparative experimental study was conducted. A single-screw expander (SSE) with different internal volume ratios and clearances was analyzed under different operating conditions with six different lubricant viscosities (viscosity from small to large: 10#, 22#, 32#, 46#, 68#, and 80#). The results show that increasing the kinematic viscosity of lubricant can effectively improve the volumetric efficiency. The volumetric efficiency of an SSE with a small clearance and a small internal volume ratio is higher, and it can approach 100% with 68# and 80# lubricants when the intake pressure is 0.5 MPa. Increasing the kinematic viscosity of the lubricant reduces the shaft power. The shaft power of an SSE with a large clearance and a small internal volume ratio is larger, and the maximum shaft power with 10# lubricant is 5.78 kW at 0.9 MPa and 3000 rpm. The kinematic viscosity of the lubricant significantly influences the shaft power of the SSE under high-speed conditions, and with the maximum variation being 11.9%. The shaft efficiency of an SSE with a small clearance and a small internal volume ratio is higher, and the gas consumption rate is lower. A low-viscosity lubricant should be used to avoid over-expansion when the intake pressure is lower than 0.6 MPa. The SSE with 46# lubricant has good comprehensive performance, where the maximum shaft efficiency and the minimum gas consumption rate obtained experimentally are 49.29% and 61.23 kg/(kW.h), respectively.
Keyword :
Single-screw expander Single-screw expander Compressed air energy storage Compressed air energy storage Structural parameters Structural parameters Kinematic viscosity of lubricant Kinematic viscosity of lubricant
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GB/T 7714 | Song, Xiaofeng , Wu, Yuting , Shen, Lili et al. Comparative experimental analysis of the effect of lubricant viscosity on the performance of a single-screw expander with different structures [J]. | JOURNAL OF ENERGY STORAGE , 2022 , 52 . |
MLA | Song, Xiaofeng et al. "Comparative experimental analysis of the effect of lubricant viscosity on the performance of a single-screw expander with different structures" . | JOURNAL OF ENERGY STORAGE 52 (2022) . |
APA | Song, Xiaofeng , Wu, Yuting , Shen, Lili , Wang, Wei , Lei, Biao , Zhi, Ruiping et al. Comparative experimental analysis of the effect of lubricant viscosity on the performance of a single-screw expander with different structures . | JOURNAL OF ENERGY STORAGE , 2022 , 52 . |
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Abstract :
The performance of a heat exchanger is directly related to the energy conversion efficiency of the thermal storage system, and its optimal design is an important method to improve the performance of the heat exchanger. This paper uses the distributed parameter method to analyze the effect of the structural parameters and operating parameters of a heat exchanger on the entransy dissipation rate, the entransy dissipation number, the entransy dissipation heat resistance, entropy production rate, and entropy production number in a molten salt-supercritical CO2 concentric tube heat exchanger. The results show that the entransy dissipation rate and entropy production rate have the same trend, with the structural parameters and operating parameters, as well as the changes in the entransy dissipation number and entransy dissipation thermal resistance, jointly affected by the entransy dissipation rate and the heat exchange. Based on the above indicators, single-objective and multi-objective optimization calculations were carried out. The results show that taking the minimum entropy dissipation number, entransy dissipation heat resistance, and improved entropy production number as the objective functions, and using the heat transfer effectiveness as the evaluation index, the optimization effect is better. The epsilon value is increased by 41.2%, 39.5%, and 40.3% compared with the reference individual. In the multi-objective optimization, taking the minimum number of entransy dissipation and entropy production as the objective function, and using the efficiency of heat transfer and the pressure drop of the working fluid as the evaluation indicators, the optimization effect is better. Compared with the reference individual, the epsilon value increased by 23.5%, and Delta Ph and Delta Pc decreased by 51.9% and 32.5%, respectively. This study provides a reference for the optimization of supercritical CO2 heat exchangers by utilizing parameters such as entransy and entropy, which reflect the irreversible loss of the heat transfer process.
Keyword :
entransy dissipation entransy dissipation thermal storage system thermal storage system thermodynamic analysis thermodynamic analysis entropy dissipation entropy dissipation
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GB/T 7714 | Dong, Xiaoming , Zhang, Cancan , Wu, Yuting et al. Thermodynamic Analysis and Optimization Design of a Molten Salt-Supercritical CO2 Heat Exchanger [J]. | ENERGIES , 2022 , 15 (19) . |
MLA | Dong, Xiaoming et al. "Thermodynamic Analysis and Optimization Design of a Molten Salt-Supercritical CO2 Heat Exchanger" . | ENERGIES 15 . 19 (2022) . |
APA | Dong, Xiaoming , Zhang, Cancan , Wu, Yuting , Lu, Yuanwei , Mu, Chongfang . Thermodynamic Analysis and Optimization Design of a Molten Salt-Supercritical CO2 Heat Exchanger . | ENERGIES , 2022 , 15 (19) . |
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Abstract :
Addressing the growing need of oil-free compressed air has drawn the development of the water lubricated single-screw air compressor (WLSSAC). For WLSSAC, clearance height is an important design parameters relevant to compressor performance. In this study, a thermodynamic model of the working process of a WLSSAC is established in consideration of the viscous friction power consumption and mass transfer between water and wet air. The theoretical model is simulated by Matlab software, and the accuracy of the theoretical model is verified by experimental results. The influence of each leakage path on the rate of leakage flow, viscous friction power consumption, and efficiency are analyzed using the proposed model. The effects of clearance height on adiabatic efficiency, volumetric efficiency, and specific power are calculated and discussed. Results show that the viscous friction power consumption caused by wall velocity decreases gradually with the increase in clearance height, while the viscous friction power consumption caused by pressure difference increases gradually in each leakage path. With the increase in clearance height, the rate of leakage flow increases gradually, the adiabatic and volumetric efficiencies decrease gradually, and the specific power increases gradually. The clearance height is recommended to be 0.03e0.06 mm for the design of WLSSAC.(c) 2022 Elsevier Ltd. All rights reserved.
Keyword :
Clearance height Clearance height Water-lubricated compressor Water-lubricated compressor Mass transfer Mass transfer Viscous friction power consumption Viscous friction power consumption Single-screw air compressor Single-screw air compressor
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GB/T 7714 | Li, Yanan , Zhi, Ruiping , Wu, Yuting et al. Influence of clearance height on performance of water-lubricated single-screw air compressor [J]. | ENERGY , 2022 , 251 . |
MLA | Li, Yanan et al. "Influence of clearance height on performance of water-lubricated single-screw air compressor" . | ENERGY 251 (2022) . |
APA | Li, Yanan , Zhi, Ruiping , Wu, Yuting , Wang, Jingfu , Lei, Biao , Shen, Lili . Influence of clearance height on performance of water-lubricated single-screw air compressor . | ENERGY , 2022 , 251 . |
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Abstract :
SiO_(2)纳米颗粒对二元硝酸盐表面张力的影响
Keyword :
表面张力 表面张力 二元硝酸盐 二元硝酸盐 纳米颗粒 纳米颗粒 拉筒法 拉筒法
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GB/T 7714 | 张慧 , 李锐 , 熊亚选 et al. SiO_(2)纳米颗粒对二元硝酸盐表面张力的影响 [J]. | 张慧 , 2021 , 49 (1) : 157-161 . |
MLA | 张慧 et al. "SiO_(2)纳米颗粒对二元硝酸盐表面张力的影响" . | 张慧 49 . 1 (2021) : 157-161 . |
APA | 张慧 , 李锐 , 熊亚选 , 冷光辉 , 吴玉庭 , 徐鹏 et al. SiO_(2)纳米颗粒对二元硝酸盐表面张力的影响 . | 张慧 , 2021 , 49 (1) , 157-161 . |
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