Pub Date : 2024-09-01DOI: 10.1088/1742-6596/2838/1/012016
Bin Liu, Tiantian Huang
CO2 geological storage is one of the important means to mitigate the greenhouse effect. The safe underground storage of CO2 largely depends on the mechanical integrity of the caprock. This paper establishes a fluid-solid coupling model for CO2 geological storage to study the changes in pore pressure, vertical displacement, and effective stress in the caprock during the CO2 injection process. Combined with the Mohr-Coulomb criterion, the study determines whether mechanical failure occurs in the caprock. The results indicate that, at the beginning of CO2 injection, significant changes occur in the pore pressure, vertical displacement, and effective stress at the bottom of the caprock near the injection well, which then tend to stabilize; the maximum pore pressure at the bottom of the caprock reaches 36.08 MPa; the caprock near the injection well is considered the most critical area, where the risk of mechanical failure is highest; at the end of CO2 injection, the stress state does not reach the limit, and the caprock remains stable.
{"title":"Mechanical integrity analysis of caprock during the CO2 injection phase","authors":"Bin Liu, Tiantian Huang","doi":"10.1088/1742-6596/2838/1/012016","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012016","url":null,"abstract":"CO<sub>2</sub> geological storage is one of the important means to mitigate the greenhouse effect. The safe underground storage of CO<sub>2</sub> largely depends on the mechanical integrity of the caprock. This paper establishes a fluid-solid coupling model for CO<sub>2</sub> geological storage to study the changes in pore pressure, vertical displacement, and effective stress in the caprock during the CO<sub>2</sub> injection process. Combined with the Mohr-Coulomb criterion, the study determines whether mechanical failure occurs in the caprock. The results indicate that, at the beginning of CO<sub>2</sub> injection, significant changes occur in the pore pressure, vertical displacement, and effective stress at the bottom of the caprock near the injection well, which then tend to stabilize; the maximum pore pressure at the bottom of the caprock reaches 36.08 MPa; the caprock near the injection well is considered the most critical area, where the risk of mechanical failure is highest; at the end of CO<sub>2</sub> injection, the stress state does not reach the limit, and the caprock remains stable.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":"45 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199325","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1088/1742-6596/2838/1/012011
Hechen Liu, Hong Yu, Mingjia Zhang, Peng Wu
Resistance to hygrothermal aging is the key to the popularization and application of basalt fiber composites in the field of electrical equipment, so it is crucial to develop fiber surface-modified coatings suitable for basalt fibers with excellent hygrothermal resistance. In this study, the performance changes of basalt fiber composite samples treated with four types of surface coatings under artificially accelerated hygrothermal aging test were comparatively analyzed, and the mechanism of different components in the surface coatings was further analyzed. The results showed that the use of epoxy resin emulsion co-mingled with acrylic emulsion as the film-forming agent could significantly improve the mechanical properties of the samples. The use of epoxy resin emulsion co-blended with polyurethane emulsion as the film-forming agent improved the insulating properties and moisture and heat resistance of the samples. Further, the use of 5:1:1 epoxy emulsion, acrylic emulsion, and polyurethane emulsion co-blended as the film-forming agent component can ensure the insulation and hygrothermal resistance of the samples while taking into account the mechanical properties. After 120 hours of wet-heat aging, the breakdown field strength was increased by 22%, leakage current and dielectric loss angle was increased by 10%, and the mechanical properties were also significantly improved compared with the sample with epoxy emulsion as the main film-forming agent. In summary, through the compounding of the film-forming agent emulsion components, the optimization of the moisture and heat resistance of basalt fiber composites can be achieved, and the use of the mass percentage of 5:1:1 for the three types of emulsions blended to prepare the fiber surface coatings is more suitable for the treatment of basalt fibers to prepare the electrician’s equipment.
{"title":"Study on the effect of film-forming agent composition on moisture and heat resistance of basalt fiber composites","authors":"Hechen Liu, Hong Yu, Mingjia Zhang, Peng Wu","doi":"10.1088/1742-6596/2838/1/012011","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012011","url":null,"abstract":"Resistance to hygrothermal aging is the key to the popularization and application of basalt fiber composites in the field of electrical equipment, so it is crucial to develop fiber surface-modified coatings suitable for basalt fibers with excellent hygrothermal resistance. In this study, the performance changes of basalt fiber composite samples treated with four types of surface coatings under artificially accelerated hygrothermal aging test were comparatively analyzed, and the mechanism of different components in the surface coatings was further analyzed. The results showed that the use of epoxy resin emulsion co-mingled with acrylic emulsion as the film-forming agent could significantly improve the mechanical properties of the samples. The use of epoxy resin emulsion co-blended with polyurethane emulsion as the film-forming agent improved the insulating properties and moisture and heat resistance of the samples. Further, the use of 5:1:1 epoxy emulsion, acrylic emulsion, and polyurethane emulsion co-blended as the film-forming agent component can ensure the insulation and hygrothermal resistance of the samples while taking into account the mechanical properties. After 120 hours of wet-heat aging, the breakdown field strength was increased by 22%, leakage current and dielectric loss angle was increased by 10%, and the mechanical properties were also significantly improved compared with the sample with epoxy emulsion as the main film-forming agent. In summary, through the compounding of the film-forming agent emulsion components, the optimization of the moisture and heat resistance of basalt fiber composites can be achieved, and the use of the mass percentage of 5:1:1 for the three types of emulsions blended to prepare the fiber surface coatings is more suitable for the treatment of basalt fibers to prepare the electrician’s equipment.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199451","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1088/1742-6596/2838/1/012032
Renping Zhang, Zuxiang Zhou
Heat pipe coupled Latent Heat Thermal Energy Storage (LHTES) is a commonly used technique for improving heat storage, due to its advantages such as heat conduction, isothermal, and uniform temperature. Adding fins to the heat pipe can enhance energy storage efficiency and system performance. Although previous research has looked into how heat pipe layouts affect LHTES, there is still a dearth of research on fin geometry optimization for boosted heat transfer. In this work, we used ANSYS Fluent to simulate the consequence of fin placement upon the heating capacity of a Phase Change Material (PCM) based LHTES system. Through an in-depth analysis of the heat transfer mechanisms, in an effort to quicken the PCM’s solidification process, we adjusted the fins’ length and spacing. The LHTES system’s overall solidification time was greatly shortened by the optimized model, going from 18800 seconds to 8500 seconds, achieving a 54.79% enhancement in thermal transfer efficiency.
{"title":"Research and optimization of heat transfer characteristics of heat pipe-coupled phase change energy storage system","authors":"Renping Zhang, Zuxiang Zhou","doi":"10.1088/1742-6596/2838/1/012032","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012032","url":null,"abstract":"Heat pipe coupled Latent Heat Thermal Energy Storage (LHTES) is a commonly used technique for improving heat storage, due to its advantages such as heat conduction, isothermal, and uniform temperature. Adding fins to the heat pipe can enhance energy storage efficiency and system performance. Although previous research has looked into how heat pipe layouts affect LHTES, there is still a dearth of research on fin geometry optimization for boosted heat transfer. In this work, we used ANSYS Fluent to simulate the consequence of fin placement upon the heating capacity of a Phase Change Material (PCM) based LHTES system. Through an in-depth analysis of the heat transfer mechanisms, in an effort to quicken the PCM’s solidification process, we adjusted the fins’ length and spacing. The LHTES system’s overall solidification time was greatly shortened by the optimized model, going from 18800 seconds to 8500 seconds, achieving a 54.79% enhancement in thermal transfer efficiency.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":"3 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1088/1742-6596/2838/1/012018
Zhaohui Gu, Hui Wang
This article examines the impact of the EMA-GMA combination on the mechanical characteristics, fluidity, and glass transition temperature of PMMA/ASA alloy and uses scanning electron microscopy to characterize the modified PMMA/ASA alloy. The findings indicate that the addition of 5% EMA-GMA to PMMA/ASA significantly enhances its fracture resistance without compromising its stiffness. When the additional amount of EMA-GMA exceeds 10%, the mechanical properties and fluidity of the alloy begin to decline significantly. EMA-GMA within 15% can promote PMMA/ASA compatibility.
{"title":"Performance and mechanism analysis of EMA-GMA modified PMMA/ASA alloy","authors":"Zhaohui Gu, Hui Wang","doi":"10.1088/1742-6596/2838/1/012018","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012018","url":null,"abstract":"This article examines the impact of the EMA-GMA combination on the mechanical characteristics, fluidity, and glass transition temperature of PMMA/ASA alloy and uses scanning electron microscopy to characterize the modified PMMA/ASA alloy. The findings indicate that the addition of 5% EMA-GMA to PMMA/ASA significantly enhances its fracture resistance without compromising its stiffness. When the additional amount of EMA-GMA exceeds 10%, the mechanical properties and fluidity of the alloy begin to decline significantly. EMA-GMA within 15% can promote PMMA/ASA compatibility.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":"11 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199336","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A high voltage shunt capacitor bank is very important for the normal operation of the power system, especially for the UHVDC transmission in long distance large capacity transmission, and power system networking has an important role. Therefore, its performance response under earthquakes is one of the key concerns. Through the fine finite element simulation modeling of the actual capacitor, the sine beat wave, and the actual earthquake input, the dynamic characteristics and the response index under the earthquake are studied. The results show that the stiffness in the x direction of the capacitor assembly is greater than that in the y direction. The weak position of the model is the root and top of the end insulator and the middle insulator. Under the action of different working conditions, such as X - and Y-El Centro waves, the maximum stress response of the root of the end insulator of the capacitor device is 4.98 MPa, and the safety factor is 3.51, which meets the requirement greater than 1.67.
高压并联电容器组对电力系统的正常运行非常重要，尤其是对特高压直流输电中的长距离大容量输电以及电力系统联网具有重要作用。因此，其在地震下的性能响应是人们关注的重点之一。通过对实际电容器、正弦拍波和实际地震输入的精细有限元仿真建模，研究了地震下的动态特性和响应指标。结果表明，电容器组件 x 方向的刚度大于 y 方向的刚度。模型的薄弱位置是端部绝缘子和中间绝缘子的根部和顶部。在 X 波和 Y 中心波等不同工况作用下，电容器装置端部绝缘子根部的最大应力响应为 4.98 兆帕，安全系数为 3.51，满足大于 1.67 的要求。
{"title":"Analysis of seismic damage mechanism of capacitor","authors":"Qingyun Min, Zhihu Hong, Dexu Zou, Fangrong Zhou, Longchang Zhu, Weiju Dai, Jingyi Yan, Haoruo Sun, Qiang Xie","doi":"10.1088/1742-6596/2838/1/012037","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012037","url":null,"abstract":"A high voltage shunt capacitor bank is very important for the normal operation of the power system, especially for the UHVDC transmission in long distance large capacity transmission, and power system networking has an important role. Therefore, its performance response under earthquakes is one of the key concerns. Through the fine finite element simulation modeling of the actual capacitor, the sine beat wave, and the actual earthquake input, the dynamic characteristics and the response index under the earthquake are studied. The results show that the stiffness in the x direction of the capacitor assembly is greater than that in the y direction. The weak position of the model is the root and top of the end insulator and the middle insulator. Under the action of different working conditions, such as X - and Y-El Centro waves, the maximum stress response of the root of the end insulator of the capacitor device is 4.98 MPa, and the safety factor is 3.51, which meets the requirement greater than 1.67.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":"144 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Deepening research on electrothermal integrated energy systems has heightened the coupling between electric power and thermal systems. Accurate electrothermal load scenario modeling and thorough consideration of their interdependencies are crucial for effective planning and scheduling. The traditional method of generating scenarios cannot fully reflect the full complexity of the original power load. To address this, our paper introduces an enhanced clustering approach. Employing the Frank-Copula function to express the correlation between electric and thermal loads, we optimize the clustering and scene reduction sequence, yielding correlated typical electric and thermal load datasets. These refined load profiles serve as the foundation for comprehensive planning and analysis of the integrated energy system.
{"title":"Comprehensive energy system planning with a focus on electric-thermal load correlations","authors":"Chonglei Ding, Xiaoming Zhang, Guangzhe Liang, Jiaoyang Feng","doi":"10.1088/1742-6596/2838/1/012027","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012027","url":null,"abstract":"Deepening research on electrothermal integrated energy systems has heightened the coupling between electric power and thermal systems. Accurate electrothermal load scenario modeling and thorough consideration of their interdependencies are crucial for effective planning and scheduling. The traditional method of generating scenarios cannot fully reflect the full complexity of the original power load. To address this, our paper introduces an enhanced clustering approach. Employing the Frank-Copula function to express the correlation between electric and thermal loads, we optimize the clustering and scene reduction sequence, yielding correlated typical electric and thermal load datasets. These refined load profiles serve as the foundation for comprehensive planning and analysis of the integrated energy system.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199533","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1088/1742-6596/2838/1/012013
Tianjiao Li, Ming Zhu, Peng Deng, Anqi Chen, Haitong Yan, Han Yi
MgCl2-KCl-NaCl is regarded as one of the most prospective high-temperature thermal energy storage mediums and heat transfer fluids (HTF) for 3rd generation concentrated solar power (CSP) systems. However, high corrosion to alloys limits its application. In this paper, corrosion tests were conducted on 316 SS, in MgCl2-KCl-NaCl at 800°C with different content (0 wt.%,1 wt.%, and 10 wt.%) of Al powder addition as a corrosion inhibitor. The impact of Al powder was assessed through electrochemical methods, specifically impedance spectroscopy (EIS) and potentiodynamic polarization (PDP). Following corrosion tests, the morphologies and phase compositions of 316 SS were determined by using scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS) and X-ray diffraction (XRD). The addition of Al powder can significantly reduce the corrosion current density of 316 SS in MgCl2-KCl-NaCl at 800°C, which was 183.29 times higher than that with 10 wt.% without Al addition. Al and the degree increased with increasing content of Al. With the addition of 1 wt.% Al, the thickness of the diffusion layer is significantly reduced, which was 54.6 μm (100 h), 275.1 μm (200 h), 370.4 μm (300 h), and 500 μm (400 h), respectively. When the addition of Al reaches up to 10 wt.%, the inwards diffusion of Al caused the formation of Al enriched layer, which was identified as the FeAl phase, on the surface of 316 SS during the high-temperature corrosion processes. The thickness of the Al enriched layer was associated with the diffusion time of Al, and its depth was 40.4 μm (100 h), 45.3 μm (200 h), 103.5 μm (300 h), and 139.5 μm (400 h).
氯化镁（MgCl2-KCl-NaCl）被认为是第三代聚光太阳能（CSP）系统最有前景的高温热能储存介质和传热液体（HTF）之一。然而，对合金的高腐蚀性限制了它的应用。本文在 MgCl2-KCl-NaCl 溶液（800°C）中对 316 SS 进行了腐蚀试验，并添加了不同含量（0 wt.%、1 wt.% 和 10 wt.%）的铝粉作为缓蚀剂。通过电化学方法，特别是阻抗光谱法（EIS）和电位极化法（PDP），对铝粉的影响进行了评估。腐蚀测试后，使用扫描电子显微镜与能量色散光谱仪（SEM/EDS）和 X 射线衍射仪（XRD）测定了 316 SS 的形态和相组成。结果表明，铝粉的加入能明显降低 316 SS 在 MgCl2-KCl-NaCl 溶液（800°C）中的腐蚀电流密度，是 10 wt.% 无铝粉加入时的 183.29 倍。随着 Al 含量的增加，腐蚀程度也随之增加。添加 1 wt.% Al 时，扩散层的厚度明显减小，分别为 54.6 μm (100 h)、275.1 μm (200 h)、370.4 μm (300 h) 和 500 μm (400 h)。当铝的添加量达到 10 wt.%时，在高温腐蚀过程中，铝的向内扩散导致 316 SS 表面形成富铝层，该层被确定为铁铝相。富铝层的厚度与铝的扩散时间有关，其深度分别为 40.4 μm（100 小时）、45.3 μm（200 小时）、103.5 μm（300 小时）和 139.5 μm（400 小时）。
{"title":"Corrosion of 316 SS in chloride molten salt for thermal energy storage: Inhibitory effects of Al powder","authors":"Tianjiao Li, Ming Zhu, Peng Deng, Anqi Chen, Haitong Yan, Han Yi","doi":"10.1088/1742-6596/2838/1/012013","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012013","url":null,"abstract":"MgCl<sub>2</sub>-KCl-NaCl is regarded as one of the most prospective high-temperature thermal energy storage mediums and heat transfer fluids (HTF) for 3rd generation concentrated solar power (CSP) systems. However, high corrosion to alloys limits its application. In this paper, corrosion tests were conducted on 316 SS, in MgCl<sub>2</sub>-KCl-NaCl at 800°C with different content (0 wt.%,1 wt.%, and 10 wt.%) of Al powder addition as a corrosion inhibitor. The impact of Al powder was assessed through electrochemical methods, specifically impedance spectroscopy (EIS) and potentiodynamic polarization (PDP). Following corrosion tests, the morphologies and phase compositions of 316 SS were determined by using scanning electron microscopy with energy dispersive spectroscopy (SEM/EDS) and X-ray diffraction (XRD). The addition of Al powder can significantly reduce the corrosion current density of 316 SS in MgCl<sub>2</sub>-KCl-NaCl at 800°C, which was 183.29 times higher than that with 10 wt.% without Al addition. Al and the degree increased with increasing content of Al. With the addition of 1 wt.% Al, the thickness of the diffusion layer is significantly reduced, which was 54.6 μm (100 h), 275.1 μm (200 h), 370.4 μm (300 h), and 500 μm (400 h), respectively. When the addition of Al reaches up to 10 wt.%, the inwards diffusion of Al caused the formation of Al enriched layer, which was identified as the FeAl phase, on the surface of 316 SS during the high-temperature corrosion processes. The thickness of the Al enriched layer was associated with the diffusion time of Al, and its depth was 40.4 μm (100 h), 45.3 μm (200 h), 103.5 μm (300 h), and 139.5 μm (400 h).","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199331","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This paper proposes a solar liquid desiccant radiation air-conditioning system(SLDRS) and a solar desiccant wheel radiant air-conditioning system(SDWRS) that combine with a phase change energy storage radiation terminal, solar energy, and heat pump system. The models of the two systems are simulated with the transient system tool (TRNSYS) to compare the refrigeration and dehumidification effects and energy saving of the two systems. The results show that the total refrigeration capacity of the SLDRS is reduced by 20.45% compared with the solar desiccant wheel radiation air-conditioning system, the monthly average dehumidification capacity is increased by 37.09%, and the total energy consumption is reduced by 712.9 KW·h. It is evident that the cooling and dehumidifying effect and energy efficiency of the SLDRS are superior to those of the SDWRS.
{"title":"Comparative analysis of radiant air-conditioning systems combined with two different types of solar-powered dehumidification methods","authors":"Gang Li, Yixuan Liao, Yubo Dou, Jiaqi Sun, Jia Nan, Jinlong Chen","doi":"10.1088/1742-6596/2838/1/012038","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012038","url":null,"abstract":"This paper proposes a solar liquid desiccant radiation air-conditioning system(SLDRS) and a solar desiccant wheel radiant air-conditioning system(SDWRS) that combine with a phase change energy storage radiation terminal, solar energy, and heat pump system. The models of the two systems are simulated with the transient system tool (TRNSYS) to compare the refrigeration and dehumidification effects and energy saving of the two systems. The results show that the total refrigeration capacity of the SLDRS is reduced by 20.45% compared with the solar desiccant wheel radiation air-conditioning system, the monthly average dehumidification capacity is increased by 37.09%, and the total energy consumption is reduced by 712.9 KW·h. It is evident that the cooling and dehumidifying effect and energy efficiency of the SLDRS are superior to those of the SDWRS.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199452","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-09-01DOI: 10.1088/1742-6596/2838/1/012023
Aohan Zhao, Yankun Ma, Deren Chen, Dengke Wang, Meng Wang
The uniaxial compression experiments under a low-pressure environment were performed by using structural coal samples. The frequency domain response characteristics of coal mass failure under loading in a low-pressure environment were acquired by FFT transformation and wavelet packet decomposition. The results show: As the loading stress of coal increases, the AE spectrum becomes more abundant, and the whole AE spectrum shows a left-shift trend. When the gas pressure increases, the acoustic emission signals change from low-frequency high-energy to high-frequency low-energy, the frequency band gradually narrates, and the spectrum changes from complex multi-peak shape to single-peak shape. As stress increases, the proportion of energy in the band 0-4.38 kHz gradually increases, while that in other bands gradually decreases. The energy response to stress changes in the two frequency bands of 2.92-4.38 kHz and 4.38-5.84 kHz is the most obvious. When the pressure changes, the energy in three frequency bands of 2.92-4.38 kHz, 4.38-5.84 kHz, and 7.3-8.76 kHz present an evident response trend with the pressure change, and the response trend (increase) of the latter two is exactly opposite (decrease) to that of the former. This phenomenon indicates that 2.92-4.38 kHz and 4.38-5.84 kHz are the characteristic frequency bands of the coal fracture process. The findings of this research offer crucial foundational data to support the monitoring and early warning of coal and gas outburst hazards.
{"title":"Acoustic emission spectrum characteristics of structural coal destruction in negative pressure environment","authors":"Aohan Zhao, Yankun Ma, Deren Chen, Dengke Wang, Meng Wang","doi":"10.1088/1742-6596/2838/1/012023","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012023","url":null,"abstract":"The uniaxial compression experiments under a low-pressure environment were performed by using structural coal samples. The frequency domain response characteristics of coal mass failure under loading in a low-pressure environment were acquired by FFT transformation and wavelet packet decomposition. The results show: As the loading stress of coal increases, the AE spectrum becomes more abundant, and the whole AE spectrum shows a left-shift trend. When the gas pressure increases, the acoustic emission signals change from low-frequency high-energy to high-frequency low-energy, the frequency band gradually narrates, and the spectrum changes from complex multi-peak shape to single-peak shape. As stress increases, the proportion of energy in the band 0-4.38 kHz gradually increases, while that in other bands gradually decreases. The energy response to stress changes in the two frequency bands of 2.92-4.38 kHz and 4.38-5.84 kHz is the most obvious. When the pressure changes, the energy in three frequency bands of 2.92-4.38 kHz, 4.38-5.84 kHz, and 7.3-8.76 kHz present an evident response trend with the pressure change, and the response trend (increase) of the latter two is exactly opposite (decrease) to that of the former. This phenomenon indicates that 2.92-4.38 kHz and 4.38-5.84 kHz are the characteristic frequency bands of the coal fracture process. The findings of this research offer crucial foundational data to support the monitoring and early warning of coal and gas outburst hazards.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199327","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lead-acid batteries are widely used in the automotive industry, and a large amount of waste lead-acid batteries cause enormous pressure on resources and the environment. Repairing aging lead-acid batteries is an effective way to solve this problem. Due to the fact that microwaves can affect most chemical reactions and promote their progress, this paper will study the repair effect of microwaves on lead-acid batteries by combining theory and experiment methods. By analyzing the reaction principle of lead-acid batteries, a multi-physics model is established to study the influence of microwaves on the lead-acid batteries, and an experimental system is built to test the changes in capacity and final charge voltage of lead-acid batteries under the radiation of microwaves. The results demonstrate that microwave treatment significantly enhances the capacity of aging lead-acid batteries, particularly when the initial capacity is slightly above 50% of the rated capacity. Moreover, heating the battery with hot air alone hardly affects its capacity. This study reveals that microwaves have reparative effects on lead-acid batteries, providing a new method for repairing aging batteries.
{"title":"Effect of microwaves on the repair of lead-acid batteries","authors":"Desheng Hou, Fengxiu Li, Yiming Zhang, Jianwen Luo, Haoran Wu, Dezhi Gou, Zhengming Tang","doi":"10.1088/1742-6596/2838/1/012031","DOIUrl":"https://doi.org/10.1088/1742-6596/2838/1/012031","url":null,"abstract":"Lead-acid batteries are widely used in the automotive industry, and a large amount of waste lead-acid batteries cause enormous pressure on resources and the environment. Repairing aging lead-acid batteries is an effective way to solve this problem. Due to the fact that microwaves can affect most chemical reactions and promote their progress, this paper will study the repair effect of microwaves on lead-acid batteries by combining theory and experiment methods. By analyzing the reaction principle of lead-acid batteries, a multi-physics model is established to study the influence of microwaves on the lead-acid batteries, and an experimental system is built to test the changes in capacity and final charge voltage of lead-acid batteries under the radiation of microwaves. The results demonstrate that microwave treatment significantly enhances the capacity of aging lead-acid batteries, particularly when the initial capacity is slightly above 50% of the rated capacity. Moreover, heating the battery with hot air alone hardly affects its capacity. This study reveals that microwaves have reparative effects on lead-acid batteries, providing a new method for repairing aging batteries.","PeriodicalId":16821,"journal":{"name":"Journal of Physics: Conference Series","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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