B. Sayad, Alkama Djamel, Hossam Samir Ibrahim, I. Hegazy, Ayman Imam, A. M. Abed, H. Alhubashi
The urban cooling is the most effective strategy to fight the urban climate change effects in summertime. Thus, searching urban cool islands can remedy the rise of urban temperatures. This study aims to consider cool urban pathways offering optimal levels of thermal comfort in downtown Guelma during summer overheating. This involves researching the appropriate tree ratio and typology, tree layout and suitable configurations of water bodies of outdoor spaces. The scientific methodology is made through either straightforward step included on-site measurements and calculating the difference of urban temperatures to select five outdoor spaces with maximum heat stress. As our study also aims to improve the outdoor thermal comfort by natural elements, it simulates different scenarios of the selected stations using ENVI-Met model and exploiting the real field measurement of the urban microclimate. The most significant reductions in thermal comfort levels (UTCI) over three thermal phases to identify the coolest urban pathways. Consequently, we confirmed that considering cool pathways spanning from station S2 to station S8 is possible with optimal thermal comfort levels over the day; 0.46°C to 6.9°C in the morning phase, 0.94°C to 3.87°C in the hot thermal phase, and 1.42° C to 3.54° C in thermal relief phase. The findings indicate three main effects of microclimatic regulation underlie the improvement of the thermal comfort levels: tree cooling effect with (Ta ≤ 1,1° C), cooling effect of water bodies (Ta ≤ 0.3° C) and Cooling effect of trees in combination with water bodies (Ta ≤ 1,9° C).
{"title":"Simulation-Based Educational Approach Toward Improving Thermal Outdoor Comfort for Pedestrians In Semi-Arid Climate","authors":"B. Sayad, Alkama Djamel, Hossam Samir Ibrahim, I. Hegazy, Ayman Imam, A. M. Abed, H. Alhubashi","doi":"10.1093/ijlct/ctac142","DOIUrl":"https://doi.org/10.1093/ijlct/ctac142","url":null,"abstract":"\u0000 The urban cooling is the most effective strategy to fight the urban climate change effects in summertime. Thus, searching urban cool islands can remedy the rise of urban temperatures. This study aims to consider cool urban pathways offering optimal levels of thermal comfort in downtown Guelma during summer overheating. This involves researching the appropriate tree ratio and typology, tree layout and suitable configurations of water bodies of outdoor spaces. The scientific methodology is made through either straightforward step included on-site measurements and calculating the difference of urban temperatures to select five outdoor spaces with maximum heat stress. As our study also aims to improve the outdoor thermal comfort by natural elements, it simulates different scenarios of the selected stations using ENVI-Met model and exploiting the real field measurement of the urban microclimate. The most significant reductions in thermal comfort levels (UTCI) over three thermal phases to identify the coolest urban pathways. Consequently, we confirmed that considering cool pathways spanning from station S2 to station S8 is possible with optimal thermal comfort levels over the day; 0.46°C to 6.9°C in the morning phase, 0.94°C to 3.87°C in the hot thermal phase, and 1.42° C to 3.54° C in thermal relief phase. The findings indicate three main effects of microclimatic regulation underlie the improvement of the thermal comfort levels: tree cooling effect with (Ta ≤ 1,1° C), cooling effect of water bodies (Ta ≤ 0.3° C) and Cooling effect of trees in combination with water bodies (Ta ≤ 1,9° C).","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47478762","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Omonigho Peter Emenuvwe, Umar Ali Umar, Samaila Umaru, Ayodeji Nathaniel Oyedeji
Abstract This study aimed to develop and implement a fuzzy logic controlled-intelligent air purifier/humidifier. The concepts of passive purification and evaporative humidification were used to build this device, and engineering ideas and theories were used to guide the development of electrical and mechanical systems. Additionally, a fuzzy logic controller was designed, built, and integrated into the air purifier/humidifier device to help with its operation. It does this by analyzing input signals from all the sensors (dust, VOC gas, humidity, and water level) and activating the actuators (suction and blow fan). On the Arduino IDE, a C/C++ programming code was developed and uploaded onto the Arduino Uno R3 board, which houses the ATmega328P microcontroller processor. In estimating the clean air delivery rate, noise level, and moisture delivery rate, the performance of the developed air purifier/humidifier was assessed. Additionally, the electrical systems’ power consumption and the fuzzy logic controller’s ease of use were each assessed. In light of the room capacity taken into consideration, the findings obtained demonstrated that the proposed air purifier/humidifier device satisfies the minimum standard requirement of a clean air delivery rate of 140m3/hr. The outcome also revealed that the designed device’s noise level is lower than the typical threshold for an air purifier, which is less than 40 decibels. Additionally, after 68 minutes, the device raised the humidity level in a controlled area from 21% to 40%.
摘要:本课题旨在开发并实现一种模糊逻辑控制的智能空气净化器/加湿器。采用被动净化和蒸发加湿的概念构建该装置，并采用工程思想和理论指导电气和机械系统的开发。此外，还设计、构建了一个模糊逻辑控制器，并将其集成到空气净化器/加湿器设备中，以帮助其运行。它通过分析来自所有传感器(灰尘、VOC气体、湿度和水位)的输入信号并激活执行器(吸力和吹风机)来实现这一点。在Arduino IDE上，开发了C/ c++编程代码并将其上传到Arduino Uno R3板上，该板装有ATmega328P微控制器处理器。在估计清洁空气输送率、噪音水平和水分输送率时，评估了所开发的空气净化器/加湿器的性能。此外，还对电气系统的功耗和模糊控制器的易用性进行了评估。考虑到房间容量，所获得的结果表明，拟议的空气净化器/加湿器装置满足140立方米/小时洁净空气输送率的最低标准要求。结果还显示，该设计设备的噪音水平低于空气净化器的典型阈值，即低于40分贝。此外，68分钟后，该设备将受控区域的湿度水平从21%提高到40%。
{"title":"Development and performance evaluation of an intelligent air purifier/humidifier using fuzzy logic controller","authors":"Omonigho Peter Emenuvwe, Umar Ali Umar, Samaila Umaru, Ayodeji Nathaniel Oyedeji","doi":"10.1093/ijlct/ctad004","DOIUrl":"https://doi.org/10.1093/ijlct/ctad004","url":null,"abstract":"Abstract This study aimed to develop and implement a fuzzy logic controlled-intelligent air purifier/humidifier. The concepts of passive purification and evaporative humidification were used to build this device, and engineering ideas and theories were used to guide the development of electrical and mechanical systems. Additionally, a fuzzy logic controller was designed, built, and integrated into the air purifier/humidifier device to help with its operation. It does this by analyzing input signals from all the sensors (dust, VOC gas, humidity, and water level) and activating the actuators (suction and blow fan). On the Arduino IDE, a C/C++ programming code was developed and uploaded onto the Arduino Uno R3 board, which houses the ATmega328P microcontroller processor. In estimating the clean air delivery rate, noise level, and moisture delivery rate, the performance of the developed air purifier/humidifier was assessed. Additionally, the electrical systems’ power consumption and the fuzzy logic controller’s ease of use were each assessed. In light of the room capacity taken into consideration, the findings obtained demonstrated that the proposed air purifier/humidifier device satisfies the minimum standard requirement of a clean air delivery rate of 140m3/hr. The outcome also revealed that the designed device’s noise level is lower than the typical threshold for an air purifier, which is less than 40 decibels. Additionally, after 68 minutes, the device raised the humidity level in a controlled area from 21% to 40%.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135360584","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
As one of the sectors affected by global climate change, tourism enterprises are actively seeking feasible energy-saving and emission reduction schemes. The article adopts the evolutionary game approach and establishes the game matrix between tourism enterprises and the government. The research results show that: the strategy choice of the two-game subjects depends on the initial state and its evolutionary path. The local government needs to adjust penalty measures for environmental pollution of tourism enterprises and reduce the cost of controlling low carbon reasonably tourism. Enterprises need to reduce the cost of saving energy through dynamic adjustment of carbon emission rewards, which are the basis of the long-term perspective and the big picture. On the premise of considering both interests, tourism enterprises and government should make joint efforts to achieve the goal of energy conservation, environmental protection and sustainable development.
{"title":"Evolutionary game analysis of energy saving behavior of tourism enterprises under carbon emission constraints","authors":"Zi Tang, Minsi Zhang","doi":"10.1093/ijlct/ctac133","DOIUrl":"https://doi.org/10.1093/ijlct/ctac133","url":null,"abstract":"\u0000 As one of the sectors affected by global climate change, tourism enterprises are actively seeking feasible energy-saving and emission reduction schemes. The article adopts the evolutionary game approach and establishes the game matrix between tourism enterprises and the government. The research results show that: the strategy choice of the two-game subjects depends on the initial state and its evolutionary path. The local government needs to adjust penalty measures for environmental pollution of tourism enterprises and reduce the cost of controlling low carbon reasonably tourism. Enterprises need to reduce the cost of saving energy through dynamic adjustment of carbon emission rewards, which are the basis of the long-term perspective and the big picture. On the premise of considering both interests, tourism enterprises and government should make joint efforts to achieve the goal of energy conservation, environmental protection and sustainable development.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44300953","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hussein A. Z. AL‐bonsrulah, S. Danook, M. Alshukri, Ali Mahmood Ahmed, R. Vijayanandh, Dhinakaran Veeman, Mohammed Al‐Bahrani
In this study, utilizing air velocity by converting wind kinetic energy into mechanical energy due to the converging area, has been numerically studied by proposing a 3D novel model and using ANSYS Fluent 19 software. Solar radiation by using the radiation model (S2S) has been considered to benefit from the heat energy to be converted into kinetic energy of the flow. Ultimate dimensions were calculated for the proposed nozzle is made of glass material. The study concentrates on the utilization of solar nozzles and their effect on wind energy. This study focused on and attempted to increase the local wind velocity (1 m/sec) in Kirkuk city in Iraq, to a higher velocity that could produce a large amount of kinetic energy which is then converted to generate power. Hence, increasing the efficiency of the plant. Results showed that wind velocity increases as the heat gain increases and the area decreased. The velocity at the converging position without including the solar radiation model reached about (15.1 m/sec), while in the case of enabling the solar radiation, it showed a value of (15.75 m/sec). As a result, the power produced from this proposed method has increased by a value of 74 W.
{"title":"CFD Modeling of a Horizontal Wind Turbine by Utilizing Solar Nozzle for Power Production","authors":"Hussein A. Z. AL‐bonsrulah, S. Danook, M. Alshukri, Ali Mahmood Ahmed, R. Vijayanandh, Dhinakaran Veeman, Mohammed Al‐Bahrani","doi":"10.1093/ijlct/ctac127","DOIUrl":"https://doi.org/10.1093/ijlct/ctac127","url":null,"abstract":"\u0000 In this study, utilizing air velocity by converting wind kinetic energy into mechanical energy due to the converging area, has been numerically studied by proposing a 3D novel model and using ANSYS Fluent 19 software. Solar radiation by using the radiation model (S2S) has been considered to benefit from the heat energy to be converted into kinetic energy of the flow. Ultimate dimensions were calculated for the proposed nozzle is made of glass material. The study concentrates on the utilization of solar nozzles and their effect on wind energy. This study focused on and attempted to increase the local wind velocity (1 m/sec) in Kirkuk city in Iraq, to a higher velocity that could produce a large amount of kinetic energy which is then converted to generate power. Hence, increasing the efficiency of the plant. Results showed that wind velocity increases as the heat gain increases and the area decreased. The velocity at the converging position without including the solar radiation model reached about (15.1 m/sec), while in the case of enabling the solar radiation, it showed a value of (15.75 m/sec). As a result, the power produced from this proposed method has increased by a value of 74 W.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44775627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fish waste (FW) is biodegradable waste that remains underutilized and causes a problem to the environment since the existing disposal techniques result in health risks and environmental pollution. FW has significant potential for producing biogas that decrease the reliance on fossil fuels because it contains easily biodegradable organic matter. The physicochemical analysis of the fish waste such as moisture content (MC) of 61.78 %, volatile solids (VS) of 93.94 %, total solids (TS) of 38.21 %, ash content (AC) of 0.52%, total organic carbon (TOC) of 54.2%, total kjeldahl nitrogen (TKN) of 9.2% and carbon to nitrogen (C/N) ratio of 5.89 % were considered and analyzed in this research. In addition, the methane potential was determined and obtained using gas detector. The results shown that the methane (CH4) content in fish waste was 50.12 % which was the potential feedstock of fish waste for biogas production. Nevertheless, the VS of fish waste was high which was good for this feedstock to be easily digested as the sign of producing biogas and demonstrates 99.9985% of performance rate. Finally, the FW had a lower C/N ratio compared to other biogas production waste. Future work needs to consider co-digestion with higher C/N ratio feedstocks.
{"title":"Characterization and Analysis of Fish Waste as Feedstock for Biogas Production","authors":"Hortence Ingabire, Boniface Ntambara, Ezgad Mazimpaka","doi":"10.1093/ijlct/ctac135","DOIUrl":"https://doi.org/10.1093/ijlct/ctac135","url":null,"abstract":"\u0000 Fish waste (FW) is biodegradable waste that remains underutilized and causes a problem to the environment since the existing disposal techniques result in health risks and environmental pollution. FW has significant potential for producing biogas that decrease the reliance on fossil fuels because it contains easily biodegradable organic matter. The physicochemical analysis of the fish waste such as moisture content (MC) of 61.78 %, volatile solids (VS) of 93.94 %, total solids (TS) of 38.21 %, ash content (AC) of 0.52%, total organic carbon (TOC) of 54.2%, total kjeldahl nitrogen (TKN) of 9.2% and carbon to nitrogen (C/N) ratio of 5.89 % were considered and analyzed in this research. In addition, the methane potential was determined and obtained using gas detector. The results shown that the methane (CH4) content in fish waste was 50.12 % which was the potential feedstock of fish waste for biogas production. Nevertheless, the VS of fish waste was high which was good for this feedstock to be easily digested as the sign of producing biogas and demonstrates 99.9985% of performance rate. Finally, the FW had a lower C/N ratio compared to other biogas production waste. Future work needs to consider co-digestion with higher C/N ratio feedstocks.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42083283","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Pandey, R. Shrestha, Nawraj Bhattarai, Rabin Dhakal
Hydropower is powered by water, making it a clean source of energy. It contributes about 17% of worldwide annual energy generation and 90% of national energy generation, out of which 25% of its generation is contributed by small hydropower plants (SHPs). Thus, Nepal is predominantly dependent on a clean source of energy for power generation. In quantitative terms, approximately 70% of hydropower plants in Nepal are SHPs. Unfortunately, there are several bottlenecks to the smooth operation of these plants, viz. run-off-river hydropower with low water flow in dry season, insufficiency of proper guidance monitoring, regularization and inadequate and unfriendly policies. The study is based on primary and secondary data considering the SHPs spreading from eastern to western Nepal. Furthermore, the study follows the multicriteria decision analysis method to generalize the major issues at the sites. Inadequate water flow in the dry season is not the only issue for reduction in power generation; mechanical failure due to lack of monitoring and periodical maintenance is the predominant reason for the reduction in power output. This study discusses the role of reduction in water flow, unavailability of a trained workforce in rural hydropower areas, absence of appropriate equipment monitoring guidelines and inconsistent maintenance in the equipment failure and power production of hydropower plants. Every one in three SHPs has issues with smooth operation in terms of generation capacity, and overall, 50% of SHPs have mechanical issues as the major problem, which concludes the findings of the research.
{"title":"Problems identification and performance analysis in small hydropower plants in Nepal","authors":"R. Pandey, R. Shrestha, Nawraj Bhattarai, Rabin Dhakal","doi":"10.1093/ijlct/ctad043","DOIUrl":"https://doi.org/10.1093/ijlct/ctad043","url":null,"abstract":"Hydropower is powered by water, making it a clean source of energy. It contributes about 17% of worldwide annual energy generation and 90% of national energy generation, out of which 25% of its generation is contributed by small hydropower plants (SHPs). Thus, Nepal is predominantly dependent on a clean source of energy for power generation. In quantitative terms, approximately 70% of hydropower plants in Nepal are SHPs. Unfortunately, there are several bottlenecks to the smooth operation of these plants, viz. run-off-river hydropower with low water flow in dry season, insufficiency of proper guidance monitoring, regularization and inadequate and unfriendly policies. The study is based on primary and secondary data considering the SHPs spreading from eastern to western Nepal. Furthermore, the study follows the multicriteria decision analysis method to generalize the major issues at the sites. Inadequate water flow in the dry season is not the only issue for reduction in power generation; mechanical failure due to lack of monitoring and periodical maintenance is the predominant reason for the reduction in power output. This study discusses the role of reduction in water flow, unavailability of a trained workforce in rural hydropower areas, absence of appropriate equipment monitoring guidelines and inconsistent maintenance in the equipment failure and power production of hydropower plants. Every one in three SHPs has issues with smooth operation in terms of generation capacity, and overall, 50% of SHPs have mechanical issues as the major problem, which concludes the findings of the research.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":"1 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60777052","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The research paper discusses the challenges and opportunities surrounding sustainable waterfront development in Jeddah City, Saudi Arabia. The city faces several challenges such as inadequate infrastructure and hasty urbanization, but its strategic location, cultural heritage, and economic potential provide opportunities for sustainable development. The paper presents a comprehensive literature review of successful case studies from other cities and regions to identify the best practices and innovative methods for sustainable waterfront development in Jeddah City. The paper recommends green infrastructure, public–private partnerships and community-based planning and design to promote sustainable waterfront development. The paper emphasizes the need for an integrated and coordinated approach to waterfront development that focuses on enhancing resilience, preserving cultural heritage and promoting social equity. The paper suggests that further research is necessary to better understand the challenges and opportunities for sustainable waterfront development in Jeddah City. The areas that require attention include stakeholder engagement, the impact of climate change and the potential for alternative financing mechanisms. The findings of this research paper can guide policy makers, planners, developers and community leaders to make informed decisions toward sustainable waterfront development in Jeddah City.
{"title":"Investigating the challenges and opportunities for sustainable waterfront development in Jeddah City","authors":"Sultan Khalid Zaki, I. Hegazy","doi":"10.1093/ijlct/ctad062","DOIUrl":"https://doi.org/10.1093/ijlct/ctad062","url":null,"abstract":"The research paper discusses the challenges and opportunities surrounding sustainable waterfront development in Jeddah City, Saudi Arabia. The city faces several challenges such as inadequate infrastructure and hasty urbanization, but its strategic location, cultural heritage, and economic potential provide opportunities for sustainable development. The paper presents a comprehensive literature review of successful case studies from other cities and regions to identify the best practices and innovative methods for sustainable waterfront development in Jeddah City. The paper recommends green infrastructure, public–private partnerships and community-based planning and design to promote sustainable waterfront development. The paper emphasizes the need for an integrated and coordinated approach to waterfront development that focuses on enhancing resilience, preserving cultural heritage and promoting social equity. The paper suggests that further research is necessary to better understand the challenges and opportunities for sustainable waterfront development in Jeddah City. The areas that require attention include stakeholder engagement, the impact of climate change and the potential for alternative financing mechanisms. The findings of this research paper can guide policy makers, planners, developers and community leaders to make informed decisions toward sustainable waterfront development in Jeddah City.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":"1 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60777819","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tiangui Lv, Qiao Zhao, Xinmin Zhang, Han Hu, Can Geng
Jiangsu Province is not only a large province in terms of carbon emissions but also a pioneer in pursuing the goal of carbon neutrality. Improving carbon emission efficiency (CEE) is the key to lowering carbon emissions. Therefore, exploring CEE is of significance for balancing economic growth and successfully cutting carbon emissions. Based on the measurement of CEE in Jiangsu Province from 2008 to 2020, this paper explores its spatiotemporal pattern and influencing factors to propose corresponding policies. The results are as follows. (1) From 2008 to 2020, the CEE of Jiangsu Province exhibited a fluctuating increase, reaching 0.894 in 2020. The temporal variation trend of CEE in each region is consistent, whereas CEE in southern Jiangsu is greater. (2) The regional differences in CEE are evident. The low-high (LH) agglomeration region is mainly in northern Jiangsu, whereas the high-low (HL) agglomeration area is mainly in southern Jiangsu. (3) Technological progress is the primary way to raise CEE in Jiangsu Province, and the contribution of technical efficiency is relatively small. (4) The primary factors that promote CEE are economic growth and green technology progress, but environmental protection has an adverse effect. Therefore, all cities in Jiangsu Province should formulate carbon emission reduction policies that are in line with their development and provide a successful reference for regional green and low-carbon development and global climate governance.
{"title":"Spatiotemporal pattern and influencing factors of regional carbon emission efficiency: an empirical analysis of Jiangsu Province in China","authors":"Tiangui Lv, Qiao Zhao, Xinmin Zhang, Han Hu, Can Geng","doi":"10.1093/ijlct/ctad091","DOIUrl":"https://doi.org/10.1093/ijlct/ctad091","url":null,"abstract":"Jiangsu Province is not only a large province in terms of carbon emissions but also a pioneer in pursuing the goal of carbon neutrality. Improving carbon emission efficiency (CEE) is the key to lowering carbon emissions. Therefore, exploring CEE is of significance for balancing economic growth and successfully cutting carbon emissions. Based on the measurement of CEE in Jiangsu Province from 2008 to 2020, this paper explores its spatiotemporal pattern and influencing factors to propose corresponding policies. The results are as follows. (1) From 2008 to 2020, the CEE of Jiangsu Province exhibited a fluctuating increase, reaching 0.894 in 2020. The temporal variation trend of CEE in each region is consistent, whereas CEE in southern Jiangsu is greater. (2) The regional differences in CEE are evident. The low-high (LH) agglomeration region is mainly in northern Jiangsu, whereas the high-low (HL) agglomeration area is mainly in southern Jiangsu. (3) Technological progress is the primary way to raise CEE in Jiangsu Province, and the contribution of technical efficiency is relatively small. (4) The primary factors that promote CEE are economic growth and green technology progress, but environmental protection has an adverse effect. Therefore, all cities in Jiangsu Province should formulate carbon emission reduction policies that are in line with their development and provide a successful reference for regional green and low-carbon development and global climate governance.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":"1 1","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60778408","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Junxian Li, Cunqiang Huang, Xiangcheng Zhang, Xu Tian, Juan An
Abstract In pursuit of low-carbon life, renewable energy is widely used, accelerating the development of lithium-ion batteries. Battery equalization is a crucial technology for lithium-ion batteries, and a simple and reliable voltage-equalization control strategy is widely used because the battery terminal voltage is very easy to obtain. But when the battery voltage is used to determine whether the battery needs to end equalization, it often does not reflect the state of charge well, resulting in battery management system misjudgment, which makes it unable to achieve a better equalization effect. In this paper, we propose a high-performance equalization control strategy based on the equalization data of the general equalization strategy, which turns on the equalization again after the equalization is completed and uses the equalization time instead of the battery voltage as the indicator. In this paper, we analyse and test this principle in detail. The difference between the final voltage of the equalized battery and the target voltage is only 4 versus 3 mV, which is an extreme advantage compared with the error of 18 versus 24 mV of the general equalization strategy, and it adds almost no workload, which makes it a good prospect for application.
为了追求低碳生活，可再生能源的广泛应用，加速了锂离子电池的发展。电池均衡是锂离子电池的一项关键技术，由于电池端电压易于获取，一种简单可靠的电压均衡控制策略被广泛采用。但在用电池电压来判断电池是否需要端均时，往往不能很好地反映充电状态，造成电池管理系统误判，使其无法达到较好的均化效果。本文提出了一种基于一般均衡策略的均衡数据的高性能均衡控制策略，该策略在均衡完成后重新开启均衡，并以均衡时间代替电池电压作为指标。本文对这一原理进行了详细的分析和测试。均衡电池的最终电压与目标电压的差值仅为4 vs 3 mV，与一般均衡策略的误差18 vs 24 mV相比，具有极大的优势，并且几乎不增加工作量，具有良好的应用前景。
{"title":"High-performance lithium-ion battery equalization strategy for energy storage system","authors":"Junxian Li, Cunqiang Huang, Xiangcheng Zhang, Xu Tian, Juan An","doi":"10.1093/ijlct/ctad068","DOIUrl":"https://doi.org/10.1093/ijlct/ctad068","url":null,"abstract":"Abstract In pursuit of low-carbon life, renewable energy is widely used, accelerating the development of lithium-ion batteries. Battery equalization is a crucial technology for lithium-ion batteries, and a simple and reliable voltage-equalization control strategy is widely used because the battery terminal voltage is very easy to obtain. But when the battery voltage is used to determine whether the battery needs to end equalization, it often does not reflect the state of charge well, resulting in battery management system misjudgment, which makes it unable to achieve a better equalization effect. In this paper, we propose a high-performance equalization control strategy based on the equalization data of the general equalization strategy, which turns on the equalization again after the equalization is completed and uses the equalization time instead of the battery voltage as the indicator. In this paper, we analyse and test this principle in detail. The difference between the final voltage of the equalized battery and the target voltage is only 4 versus 3 mV, which is an extreme advantage compared with the error of 18 versus 24 mV of the general equalization strategy, and it adds almost no workload, which makes it a good prospect for application.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135003627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Although China's new energy power generation industry has developed, how to efficiently use clean energy and ensure safe supply needs further research. As a clean, pollution-free and high calorific value energy, hydrogen provides a solution for absorbing renewable energy and ensuring the stable operation of the power system. Based on the public goods attribute of system security and system operation behavior, this paper analyzes how to express the cultural value of energy supply security through economic means, and makes configuration adjustment under different interaction modes with the power grid, so as to achieve the effect of energy supply security. A multi-objective planning and operation optimization model is established, and the resource, social, economic and environmental benefits are analyzed. The model is solved by NSGA-II. The results show that the energy waste rate of hydrogen microgrid system can be reduced by 37.16%. The probability of power failure can be reduced to 0. Typical scenarios in both off-grid mode and grid-connected mode can increase economic income. In addition, up to more than 1000 tons of carbon emissions per day could be reduced under a typical scenario.
{"title":"Coupling optimization of hydropower and hydrogen systems considering energy supply safety culture","authors":"Renlin Guo","doi":"10.1093/ijlct/ctad080","DOIUrl":"https://doi.org/10.1093/ijlct/ctad080","url":null,"abstract":"Abstract Although China's new energy power generation industry has developed, how to efficiently use clean energy and ensure safe supply needs further research. As a clean, pollution-free and high calorific value energy, hydrogen provides a solution for absorbing renewable energy and ensuring the stable operation of the power system. Based on the public goods attribute of system security and system operation behavior, this paper analyzes how to express the cultural value of energy supply security through economic means, and makes configuration adjustment under different interaction modes with the power grid, so as to achieve the effect of energy supply security. A multi-objective planning and operation optimization model is established, and the resource, social, economic and environmental benefits are analyzed. The model is solved by NSGA-II. The results show that the energy waste rate of hydrogen microgrid system can be reduced by 37.16%. The probability of power failure can be reduced to 0. Typical scenarios in both off-grid mode and grid-connected mode can increase economic income. In addition, up to more than 1000 tons of carbon emissions per day could be reduced under a typical scenario.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136047415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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