International Journal of Low-carbon Technologies最新文献_第2页

Asymmetric time-varying dependence and variable structure dependence measurement and analysis of EUA and CER EUA和CER的不对称时变依赖和变结构依赖测量与分析

IF 2.3 4区工程技术

International Journal of Low-carbon Technologies Pub Date : 2023-05-10 DOI: 10.1093/ijlct/ctad036

Xing Yang, Yijing Ye, Jia-wen Li, Jun-long Mi

{"title":"Asymmetric time-varying dependence and variable structure dependence measurement and analysis of EUA and CER","authors":"Xing Yang, Yijing Ye, Jia-wen Li, Jun-long Mi","doi":"10.1093/ijlct/ctad036","DOIUrl":"https://doi.org/10.1093/ijlct/ctad036","url":null,"abstract":"\u0000 This paper analyzed the time-varying dependence and structural dependence between EU allowances (EUAs) and certified emission reductions (CERs) by using price fluctuation data from 2008 to 2021 on EU ETS. It was found that (1) there was a strong nonlinear spillover relationship between EUAs and CERs. From March 14, 2008 to March 16, 2012, the time-varying dependence values of EUAs and CERs were mostly between 0.6 and 1, and the mean coefficient of dependence was 0.86, showing a strong interdependence. From March 17, 2012 to January 2, 2017, the correlation between them was mostly below 0.6, and the mean coefficient of dependence fell to 0.25. This indicates that the dependency between EUA futures and CER futures was very low at this stage. However, in general, the mean value of dependence was above 0.55, that is, there was a dependency between them. (2) From March 14, 2008 to January 2, 2017, there were twelve structural mutation points in EUA and CER yield sequences. After four mutation points, the dependence coefficient increased, and the structural dependence enhanced. Meanwhile, after eight mutation points, the dependence coefficient decreased and the structural dependence weakened. The overall level remained above 0.6, showing the existence of structural dependence. (3) Abrupt changes in EUA and CER prices were closely related to the promulgation of major policies and unpredictable emergencies. The former caused carbon prices to fluctuate slightly. When the period of change was short and the recovery was rapid, it caused sharp fluctuations in carbon prices. When the duration of change was long, and the recovery was slow, it yielded impacts that extend far beyond the publication of important information.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41609142","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}

引用次数: 0

Decoupling analysis of economic growth, energy consumption and CO2 emissions in the industrial sector of Guangdong Province 广东省工业部门经济增长、能源消耗和二氧化碳排放的解耦分析

IF 2.3 4区工程技术

International Journal of Low-carbon Technologies Pub Date : 2023-05-10 DOI: 10.1093/ijlct/ctad040

Qing Guo, Wenpeng You

{"title":"Decoupling analysis of economic growth, energy consumption and CO2 emissions in the industrial sector of Guangdong Province","authors":"Qing Guo, Wenpeng You","doi":"10.1093/ijlct/ctad040","DOIUrl":"https://doi.org/10.1093/ijlct/ctad040","url":null,"abstract":"\u0000 Industrial carbon emissions are the main part of China's carbon emissions, so industrial carbon emission reduction is an important tool to achieve the \"double carbon\" target. This paper constructs a Tapio model to decompose the total decoupling indicators into energy saving decoupling indicators and emission reduction decoupling indicators, with a view to revealing more deeply the reasons and mechanisms for the changes in the decoupling indicators between economic growth and carbon dioxide emissions in the industrial sector of each prefecture-level city in Guangdong Province, as well as using cluster analysis to further explore the changes in the effect of energy saving and emission reduction in the industrial sector over the three five-year plans. The conclusions showed that: (1) the overall efficiency of energy saving and emission reduction in the industrial sector of Guangdong Province has improved, but there are large differences in efficiency between different cities; (2) the energy structure of the industrial sector in Guangdong Province has changed little due to immature technology. Based on the above findings, this paper puts forward corresponding policy recommendations.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43679157","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}

引用次数: 1

Effect of nanoparticles on the evaporation of a salt water film. 纳米粒子对盐水膜蒸发的影响。

IF 2.3 4区工程技术

International Journal of Low-carbon Technologies Pub Date : 2023-05-10 DOI: 10.1093/ijlct/ctad035

A. Alla, L. Bammou, S. Alami, M. Najim, A. Charef, Said Bouchta, M. Errai, M. Feddaoui

{"title":"Effect of nanoparticles on the evaporation of a salt water film.","authors":"A. Alla, L. Bammou, S. Alami, M. Najim, A. Charef, Said Bouchta, M. Errai, M. Feddaoui","doi":"10.1093/ijlct/ctad035","DOIUrl":"https://doi.org/10.1093/ijlct/ctad035","url":null,"abstract":"\u0000 The need for freshwater supply in different parts of the world has given great interest to the study of seawater desalination which has led to the development of various innovative techniques in this field. The present numerical study contributes to the improvement of the evaporative desalination operation by introducing nanoparticles into the base fluid. The desalination technique considered in this study consists of a saltwater film falling along the inner wall of a vertical channel heated uniformly by a constant heat flux. The equations governing the flow and the heat and mass transfer associated with the boundary and interface conditions are solved numerically using the finite difference method. We considered two values of salinity, 10 g.kg-1 and 39 g.kg-1 which correspond respectively to brackish water and sea water with different types and volume fractions of nanoparticles in order to study the effect of the combination of these parameters on the enhancement of desalination by evaporation. The results showed that the evaporation process by injecting nanoparticles into salt water improves due to its positive effect on thermophysical properties. In addition, Al2O3 is significantly better for evaporative desalination than TiO2 and copper. Moreover, we can achieve the same heat and mass transfer performance by using 2% alumina instead of 4% TiO2.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44175174","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}

引用次数: 0

Activated carbon derived from highland barley straw for removing heavy metals and organic pollutants 青稞秸秆活性炭去除重金属和有机污染物的研究

IF 2.3 4区工程技术

International Journal of Low-carbon Technologies Pub Date : 2023-05-10 DOI: 10.1093/ijlct/ctad042

Yihang Yue, Zexu Yu, Xiaoju Yue, Wentao Zhou, Saiyu Wang, Yanxi Yang, Youliang Lao, Mengdi Yang, C. Du, Shifeng Wang

{"title":"Activated carbon derived from highland barley straw for removing heavy metals and organic pollutants","authors":"Yihang Yue, Zexu Yu, Xiaoju Yue, Wentao Zhou, Saiyu Wang, Yanxi Yang, Youliang Lao, Mengdi Yang, C. Du, Shifeng Wang","doi":"10.1093/ijlct/ctad042","DOIUrl":"https://doi.org/10.1093/ijlct/ctad042","url":null,"abstract":"\u0000 Biomass activated carbon has been widely used in the field of wastewater treatment because of its unique properties, such as high specific surface area and porosity, good adsorption capacity, good mechanical strength, rich functional groups and thermal stability. In this work, highland barley straw is recycled and made into activated carbon using hydrothermal carbonization and alkaline activation processes in which the dependence of the product properties on the activation temperature, as one of the critical parameters, is intensively investigated. Under the optimum conditions at an activation temperature of 1100 °C, activated carbon in the form of mesoporous structure and polycrystalline graphite was produced with a specific surface area as large as 1906 m2/g, which is superior to that of commercial products. To investigate the absorption capacity of the prepared samples for pollutants in water, such as heavy metals and organics, potassium dichromate and methylene blue were utilized as the simulated pollutants. The removal efficiency of Cr6+ and methylene blue in water reached 90.3 % within eight hours and 87.7 % within four hours, respectively, and this demonstrated an excellent absorption capacity for activated carbon converted from agricultural waste. Th e successful fabrication of activated carbon with a super large specific surface area and remarkable adsorption ability derived from highland barley straw through a hydrothermal carbonization and alkaline treatment demonstrated the feasibility of the “turning waste into wealth” recycling strategy. It has also shown great potential for use in environmental protection applications, especially for water purification.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43738372","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}

引用次数: 0

Typical Meteorological Year Data Analysis for Optimal Utilization of Energy Systems at Six Selected Locations in Nigeria 尼日利亚六个选定地点能源系统优化利用的典型气象年数据分析

IF 2.3 4区工程技术

International Journal of Low-carbon Technologies Pub Date : 2023-05-05 DOI: 10.1093/ijlct/ctad014

Kilanko Oluwaseun, O. O. Sunday, Dirisu O. Joseph, Leramo O Richard, Babalola O Philip, Aworinde K Abraham, Udo Mfon, Okonkwo M Alexander, Akomolafe I Marvellous, Saleh Bahaa

{"title":"Typical Meteorological Year Data Analysis for Optimal Utilization of Energy Systems at Six Selected Locations in Nigeria","authors":"Kilanko Oluwaseun, O. O. Sunday, Dirisu O. Joseph, Leramo O Richard, Babalola O Philip, Aworinde K Abraham, Udo Mfon, Okonkwo M Alexander, Akomolafe I Marvellous, Saleh Bahaa","doi":"10.1093/ijlct/ctad014","DOIUrl":"https://doi.org/10.1093/ijlct/ctad014","url":null,"abstract":"\u0000 In this study, the Typical Meteorological Year (TMY) data for six locations representing the 6 geo-political zones in Nigeria were generated and analyzed using the Sandia Method. The analysis shows that seasonal variations exist in all the selected locations indicating two distinct seasons: the dry and wet seasons with varying lengths from north to south of the country. Due to its high global radiation levels (21–25 MJ/m2/day), the North is a desirable location for solar-thermal systems. Also, the high monthly mean temperature variations (about 18°C), low relative humidity (15%) and constant wind speeds (4m/s) experienced in the first three months of the year aid the installation of wind energy systems and the application of evaporative cooling techniques that reduce the thermal load and energy consumption of buildings. On the other side, the high relative humidity (80%) and mediocre radiation values derived almost throughout the year in the South-west, South-east and South-south regions discourages the extensive application of evaporative cooling and solar energy based systems in such locations, but the moderate wind speeds (2.9 m/s) and monthly mean temperature variations associated with these regions between the first three months of the year allow for the application of natural ventilation and some passive cooling systems so as to reduce the thermal load of buildings in the regions. The information presented in this work can serve as a guide for design and selection of energy systems and application of energy-related projects in Nigeria.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45419436","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}

引用次数: 0

Design and modelling of a small-scale reversible high temperature heat pump – organic Rankine cycle system for industrial waste heat recovery 用于工业余热回收的小型可逆高温热泵-有机朗肯循环系统的设计和建模

IF 2.3 4区工程技术

International Journal of Low-carbon Technologies Pub Date : 2023-05-05 DOI: 10.1093/ijlct/ctad038

Rahul Velanparambil Ravindran, M. Huang, N. Hewitt

{"title":"Design and modelling of a small-scale reversible high temperature heat pump – organic Rankine cycle system for industrial waste heat recovery","authors":"Rahul Velanparambil Ravindran, M. Huang, N. Hewitt","doi":"10.1093/ijlct/ctad038","DOIUrl":"https://doi.org/10.1093/ijlct/ctad038","url":null,"abstract":"\u0000 Organic Rankine cycle (ORC) and heat pump (HP) are two well-established technologies for industrial waste heat recovery. Given the similarity between ORC and HP configurations, a system that can switch between HP and ORC modes with minimal modification is feasible. The reversible system according to the requirement of the industry can exploit waste heat in lower temperature bands operating as a high-temperature heat pump (HTHP) to provide useful process heat or as an organic Rankine cycle system generating power and thus increasing the efficiency of waste heat exploitation. This study discusses the design aspects of a small-scale reversible HTHP - ORC system, including the system layout, component selection, selection of an appropriate working fluid, the operating conditions for both modes, and equipment sizing. R1233zd(E) was selected as the refrigerant for the reversible system and an automotive open drive scroll compressor was found to be suitable which can also be employed as an expander for ORC with minimum modifications. The study also presents the modelling of the reversible system in ORC and HTHP modes including performance analysis of scroll machine in expander and compressor roles attaining isentropic efficiency values up to 62.4% and 75.4% respectively. The modelling results show a cycle efficiency of 5.9% (Tev = 102 °C, ṁr = 0.064 kg/s) in ORC mode and a COP of 4.19 in HTHP mode (for a temperature lift of 49 K with Tsource: 85 °C, Ncomp: 2000 RPM).","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44658733","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}

引用次数: 0

Optimal control of energy storage system of high-permeability distributed photovoltaic low-voltage distribution network 高渗透分布式光伏低压配电网储能系统的优化控制

IF 2.3 4区工程技术

International Journal of Low-carbon Technologies Pub Date : 2023-04-25 DOI: 10.1093/ijlct/ctad041

Yezhou Yang, Yubo Yuan, Hao Jiao, Jinming Chen, Xianglu Pang, Shuyi Zhuang

{"title":"Optimal control of energy storage system of high-permeability distributed photovoltaic low-voltage distribution network","authors":"Yezhou Yang, Yubo Yuan, Hao Jiao, Jinming Chen, Xianglu Pang, Shuyi Zhuang","doi":"10.1093/ijlct/ctad041","DOIUrl":"https://doi.org/10.1093/ijlct/ctad041","url":null,"abstract":"Photovoltaic (PV) is one of the very promising renewable energy sources, but its output power is fluctuating. To maintain PV-energy storage system-load power balance in low-voltage distribution networks, we propose a new optimized sag control strategy, which is no longer indexed by the battery voltage but by the battery state of charge (SOC), because the battery SOC can better reflect the remaining battery capacity for better performance. In addition, to further optimize its performance, we try to use the ratio of inter-cell SOC for optimization. We analyzed the deficiencies of sag control in detail, derived a control strategy with cell SOC as an indicator, and finally analyzed its performance in detail. To verify the performance of the proposed strategy, based on MATLAB, we designed the power variation of 2 Lithium-ion battery packs to maintain the bus power stability under two cases of sudden rise as well as sudden fall of PV power, and 3 Lithium-ion battery to maintain during the bus power stabilization with one set of performance after failure, and the simulation results prove the feasibility of the proposed strategy.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-04-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45140149","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}

引用次数: 0

Capacity optimization strategy for energy storage system to ensure power supply 确保电力供应的储能系统容量优化策略

IF 2.3 4区工程技术

International Journal of Low-carbon Technologies Pub Date : 2023-04-25 DOI: 10.1093/ijlct/ctad039

H. Fu, Ming Shi, Miaomiao Feng

引用次数: 1

Research on optimal scheduling of integrated energy system in low-carbon parks based on demand response 基于需求响应的低碳园区综合能源系统优化调度研究

IF 2.3 4区工程技术

International Journal of Low-carbon Technologies Pub Date : 2023-04-19 DOI: 10.1093/ijlct/ctad020

Wei Xu, W. Han, Huaizhang Jin, Y. Bai, Huan Liu

{"title":"Research on optimal scheduling of integrated energy system in low-carbon parks based on demand response","authors":"Wei Xu, W. Han, Huaizhang Jin, Y. Bai, Huan Liu","doi":"10.1093/ijlct/ctad020","DOIUrl":"https://doi.org/10.1093/ijlct/ctad020","url":null,"abstract":"\u0000 The comprehensive energy system of the park is one of the effective ways to solve the problems of low utilization efficiency of comprehensive energy and difficulty in absorbing renewable energy. By coordinating the output of each unit to optimize the scheduling of the system, the operating cost of the system can be reduced to a certain extent, and the space for new energy generation to be connected to the Internet can be increased. Aiming at the characteristics of electric, heat and gas load demand of the integrated energy system of industrial low-carbon parks and the overall needs of low-carbon development, a research on the optimal scheduling of integrated energy systems in low-carbon parks based on demand response is proposed. By analyzing the structure and components of the integrated energy system of the low-carbon park, different types of demand response are modeled. On this basis, based on the comprehensive demand response of electricity and heat, the optimal dispatch model of the integrated energy system of the low-carbon park is constructed, and the model is solved to realize the optimal dispatch of the integrated energy system of the low-carbon park. The experimental results show that the proposed method has lower operating cost of the integrated energy system, better economy of the integrated energy system, and can effectively improve the power supply reliability and energy saving rate of the integrated energy system. The average system load rate of the proposed method is up to 98.7%, the average comprehensive energy utilization rate is up to 97.9%, and the system operation cost is only 10343.1 yuan.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46762418","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}

引用次数: 0

Does the Low-Carbon Construction of Cities in China Reduce Carbon Emission Intensity? 中国城市低碳建设是否降低了碳排放强度？

IF 2.3 4区工程技术

International Journal of Low-carbon Technologies Pub Date : 2023-04-03 DOI: 10.1093/ijlct/ctac131

Chengkang He, Cheng Shu, Jinlang Zou, Yunliang Li

{"title":"Does the Low-Carbon Construction of Cities in China Reduce Carbon Emission Intensity?","authors":"Chengkang He, Cheng Shu, Jinlang Zou, Yunliang Li","doi":"10.1093/ijlct/ctac131","DOIUrl":"https://doi.org/10.1093/ijlct/ctac131","url":null,"abstract":"\u0000 Currently, realizing the coordinated green development of the economy and environment has become the focus of all walks of life. To achieve this goal, it is important for cities to promote carbon reduction. China has implemented a low-carbon city pilot (LCP) policy since 2010 to achieve green transformative development. In this context, this study aims to assess whether the LCP policy achieves carbon peaking and carbon neutrality goals. Using 2007-2019 prefecture-level panel data from China and a time-varying difference-in-difference (DID) model, we conduct a quasi-natural experiment. The empirical results show that the carbon emission intensity (CEI) is greatly reduced in cities that implemented the LCP policy. Compared with the control group, the average value of CEI of cities in the experimental group is approximately three percentage points lower, and the robustness test results prove the reliability of the baseline estimates. In addition, we examine the time lag effect and find that in the experimental group, the CEI of cities is significantly lower in the fourth year and has a tendency to gradually increase. Meanwhile, the heterogeneity analysis in this research groups the samples according to economic development, population agglomeration and resource endowment. We find that in cities with better economic development, higher population agglomeration and relatively underdeveloped resource endowment, there is a greater reduction in CEI. Finally, we conduct a mechanism test and find that in the experimental group, the CEI of cities is severely reduced due to industrial structure optimization, environmental enforcement strengthening and technological innovation capabilities enhancement.","PeriodicalId":14118,"journal":{"name":"International Journal of Low-carbon Technologies","volume":" ","pages":""},"PeriodicalIF":2.3,"publicationDate":"2023-04-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48589525","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}

引用次数: 0