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Non-uniform operative temperature distribution characteristics and heat-source-controlled core-area range of local heating radiators

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Building Simulation 2023年第1期16卷 87-103页

作者： Dengjia Wang Weijia Li Yanfeng Liu yaowen chen Liang Hu Hu Du State Key Laboratory of Green Building in Western China Xi'an University of Architecture and TechnologyXi'an 710055China School of Building Services Science and Engineering Xi'an University of Architecture and TechnologyXi'an 710055China Welsh School of Architecture Cardiff UniversityCardiffCF103NBUK

Heating the whole space,which is currently used in northern China,leads to high energy consumption and substantial pollution.A transition to local heating has the potential to help address this *** this paper,the effects of radiator-related parameters(position,power,and size)and room-related parameters(aspect ratio and height)on local heating were *** evaluation indices,the effective coefficient of operative temperature(OTEC)and the effective coefficient of local heating(LHEC),were *** addition,the heat source-control core-area(HSCCA)was proposed,and the effect range of heat sources in the space was evaluated by the attenuation of operative *** findings demonstrated that the radiator position has a greater influence on local heating than *** the position of the radiator was changed from"close to the inner wall"to"close to the outer wall",the LHEC(the interior one-quarter of room is a local heating zone)was found to decrease by 73%.The size of the radiator,which is close to the inner wall,doubled or quadrupled,and the LHEC increased by 9%and 18%.Moreover,rooms with a larger aspect ratio or small room height were found to be the most optimal for local heating *** area of the HSCCA decreased as the position of the radiator approached the outer *** findings of this study can be used as a design reference for the radiator when the heating mode changes from"full-space heating"to"local heating".

关键词： local heating radiator non-uniform thermal environment operative temperature mean radiant temperature temperature distribution

Effect of Varying Temperature and Oxygen on Particulate Matter Formation in Oxy-Biomass Combustion

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Energy Engineering 2022年第3期119卷 863-881页

作者： chen Wang Cicilia Kemunto Mesa Samuel Bimenyimana Nathan Bogonko George Adwek Yiyi Mo Godwin Norense Osarumwense Asemota Changfu Yuan yaowen chen Changtai Li Etienne Ntagwirumugara Aphrodis Nduwamungu Fujian Provincial Higher–Educational Engineering Research Centre of Intelligence and Automation in Construction College of Civil EngineeringHuaqiao UniversityXiamenChina Kenya Industrial Research and Development Institute NairobiKenya Hello Renewables Ltd.KigaliRwanda Mount Kenya University ThikaKenya African Centre of Excellence in Energy for Sustainable Development University of RwandaKigaliRwanda Morayo College NairobiKenya Fujian Baichuan Construction Technology Co. Ltd.XiamenChina Haoqi(Xiamen)Construction Technology Co. Ltd.XiamenChina University of Rwanda College of Science and TechnologyKigaliRwanda

Offsetting particulate matter emissions has become a critical global aim as there are concerted efforts to deal with environmental and energy poverty *** study consists of investigations of computing emissions of particulate matter from biomass fuels in various atmospheres and *** laboratory setup included a fixed bed electric reactor and a particulate matter(PM)measuring machine interfaced with the flue gas from the fixed bed reactor combustion *** experiments were conducted at seven different temperatures(600℃-1200℃)and six incremental oxygen concentrations(21%-100%).Five biomass types were studied;A-cornstalk,B-wood,C-wheat straw,D-Rice husk,E-Peanut shell,each pulverized to a size of approximately 75 *** study shows that PM emitted during char combustion is consistently higher than that emitted during the *** de-volatilization,increase in temperature leads to linear decrease in PM emission between atmospheres of 21%O_(2)to 50%O_(2),thereafter,between 70%O_(2)to 100%O_(2);increase in temperature leads to a rise in PM *** average PM formation from all the five considered biomass is relatively comparable however,with differing atmospheres and temperatures,the fibrous and low-density biomass forms more *** char combustion,the study shows that at oxygen levels of 21%,70%,90%and 100%,increase in temperature leads to increased PM *** increase in oxygen concentration and temperature increases the rate of combustion hence diminishing the time of combustion.

关键词： Oxy-fuel combustion particulate matter(PM) volatiles char combustion

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模块化光伏空调机组研发及性能实测分析

暖通空调 2024年第4期54卷 105-112页

作者：樊博浩王登甲肖莹陈耀文王莹莹刘艳峰刘怀灿绿色建筑全国重点实验室西安西安建筑科技大学西安珠海格力电器股份有限公司珠海

针对岛礁等孤立区域远离内陆、设备系统维修不便、安全可靠性要求高的问题,本文设计出直流型、交流型蓄电模块化新型光伏空调机组,对蓄电、逆变、制冷等机组部件进行了集成设计,对集成热堆积造成的机组性能衰减进行了理论分析。搭建了... 详细信息

针对岛礁等孤立区域远离内陆、设备系统维修不便、安全可靠性要求高的问题,本文设计出直流型、交流型蓄电模块化新型光伏空调机组,对蓄电、逆变、制冷等机组部件进行了集成设计,对集成热堆积造成的机组性能衰减进行了理论分析。搭建了性能实验平台,实测了晴天、多云和雨天等不同天气工况下模块化空调机组的运行性能,得到2类机组的COP范围为2.80~3.35。模块化光伏空调机组可满足太阳能丰富的孤立区域的空调需求,具有更换灵活方便的特点。

关键词：太阳能光伏空调模块化机组孤立区域实验测试机组性能

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西藏高原村镇住宅冬季典型热电负荷特征研究

暖通空调 2024年第8期54卷 73-80页

作者：林志泽王登甲刘艳峰王柏超陈耀文傅治国门端宜西安建筑科技大学西安绿色建筑全国重点实验室西安西藏自治区建筑勘察设计院拉萨

针对当前村镇住宅负荷特征表征中缺少基于用能行为差异的热电负荷关联性分析,以西藏高原村镇居住建筑为研究对象,通过走访与调研归纳出典型建筑结构特征、人员活动等信息,提炼出8种典型用能情景。利用EnergyPlus模拟计算不同用能行为下... 详细信息

针对当前村镇住宅负荷特征表征中缺少基于用能行为差异的热电负荷关联性分析,以西藏高原村镇居住建筑为研究对象,通过走访与调研归纳出典型建筑结构特征、人员活动等信息,提炼出8种典型用能情景。利用EnergyPlus模拟计算不同用能行为下典型居住建筑全年逐时热电负荷,根据k均值聚类分析提取村镇住宅热电负荷特征,并提出基于逐时负荷系数的动态负荷典型化方法。最后基于特征参数化分析得到用能行为差异下西藏高原村镇建筑各类用户的用能特征。

关键词：热电负荷负荷特征西藏村镇建筑用能行为居住建筑太阳能

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Performance of Gas-Steam Combined Cycle Cogeneration Units Influenced by Heating Network Terminal Steam Parameters

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Energy Engineering 2024年第6期121卷 1495-1519页

作者： Guanglu Xie Zhimin Xue Bo Xiong yaowen Huang Chaoming chen Qing Liao cheng Yang Xiaoqian Ma Zhongshan Jiaming Electric Power Co. Ltd.CNOOC Gas&Power GroupZhongshan528403China School of Electric Power South China University of TechnologyGuangzhou510640China

The determination of source-side extracted heating parameters is of great significance to the economic operation of cogeneration *** paper investigated the coupling performance of a cogeneration heating and power system multidimensionally based on the operating characteristics of the cogeneration units,the hydraulic and thermodynamic characteristics of the heating network,and the energy *** a steam network supported by a gas-steam combined cycle cogeneration system as the research case,the interaction effect among the source-side prime movers,the heating networks,and the terminal demand thermal parameters were investigated based on the designed values,the plant testing data,and the validated *** operating maps of the gas-steam combined cycle cogeneration units were obtained using THERMOFLEX,and the minimum source-side steam parameters of the steam network were solved using an inverse solution procedure based on the hydro-thermodynamic coupling *** cogeneration operating maps indicate that the available operating domain considerably narrows with the rise of the extraction steam pressure and flow *** heating network inverse solution demonstrates that the source-side steam pressure and temperature can be optimized from the originally designed 1.11 MPa and 238.8°C to 1.074 MPa and 191.15°C,*** the operating strategy with the minimum source-side heating parameters,the power peak regulation depth remarkably increases to 18.30%whereas the comprehensive thermal efficiency *** operation under the minimum source-side heating steam parameters can be superior to the originally designed one in the economy at a higher price of the heating *** a fuel price of$0.38/kg and the power to fuel price of 0.18 kg/(kW·h),the critical price ratio of heating steam to fuel is 119.1 kg/*** influence of the power-fuel price ratio on the economic deviation appears relatively weak.

关键词： Gas-steam combined cycle cogeneration of heating and power steam network inverse problem operating performance

Nuclear magnetic resonance spectroscopy is highly sensitive for lipid-soluble metabolites

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Neural Regeneration Research 2013年第22期8卷 2103-2110页

作者： Haiyang Dai Bikai Hong Zhifeng Xu Lian Ma yaowen chen Yeyu Xiao Renhua Wu Department of Medical Imaging Second Affiliated HospitalShantou University Medical College Department of Medical Imaging Huizhou Municipal Central Hospital Department of Radiology the First People's Hospital of Foshan Department of Pediatrics Second Affiliated HospitalShantou University Medical College Central Laboratory Shantou University

Although the water-soluble metabolite profile of human mesenchymal stem cells is known, the lipid profile still needs further investigation. In this study, methanol-chloroform was used to extract lipid-soluble metabolites and perchloric acid was used to extract water-soluble metabolites. Fur- thermore, a dual phase extraction method using methanol-chloroform and water was used to obtain both water and lipid fractions simultaneously. All metabolite extractions were analyzed on a 9.4T high-resolution nuclear magnetic resonance spectrometer. Metabolite resonance peaks were as- signed in the acquired spectra according to the chemical shift, and the extraction efficiency of dif- ferent methods was compared. Results showed that in the spectra of water-soluble extracts, major metabolites comprised low molecular weight metabolites, including lactate, acetic acid, fatty acids, threonine, glutamic acid, creatine, choline and its derivatives, while in the spectra of lipid-soluble extracts, most metabolites were assigned to fatty acids. Among the different extraction procedures, perchloric acid was more efficient in extracting water-soluble metabolites and methanol-chloroform was efficient in extracting organic components compared with the dual phase extraction method. Nuclear magnetic resonance spectroscopy showed that as low as 0.7 mg organic yield was enough to obtain clear resonance peaks, while about 6.0 mg water-soluble yield was needed to obtain rela- tively favorable spectral lines. These results show that the efficiency of extracting water and lipid fractions is higher using perchloric acid and methanol-chloroform compared with dual phase ex- traction and that nuclear magnetic resonance spectroscopy is highly sensitive for analyzing lipid-soluble extracts.

关键词： neural regeneration nuclear magnetic resonance spectroscopy mesenchymal stem cells metabo-lite profiles extraction method optimization water-soluble lipid-soluble perchloric acid metha-nol-chloroform grants-supported paper neuroregeneration

Modelling and Optimization of Clean and Affordable Electricity Solution for Small-Scale Savings and Credit Cooperatives(SACCOs)

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Energy Engineering 2023年第4期120卷 791-810页

作者： Xiaomei Lin Samuel Bimenyimana chenWang Godwin Norense Osarumwensa Asemota Jeanne Paula Ihirwe Aphrodis Nduwamungu Etienne Ntagwirumugara Athanase Gace Changfu Yuan yaowen chen Changtai Li Shilpi Bora YiYi Mo Jiyu Lai Mabao Wu Yong Tang Merit M.Huang College of Science and Technology The Open University of FujianFuzhou350013China Intelligence and Automation in Construction Provincial Higher–Educational Engineering Research Centre Huaqiao UniversityXiamen361021China African Centre of Excellence in Energy for Sustainable Development University of RwandaKigali4285Rwanda Morayo College Nairobi999070Kenya Department of Economics and Management Hebei University of TechnologyTianjin300401China College of Science and Technology University of RwandaKigali4285Rwanda Fujian Baichuan Construction Technology Co. Ltd.HuliXiamen361021China Haoqi(Xiamen)Construction Technology Co. Ltd.HaicangXiamen361021China School ofDesign Ajeenkiya D Y PatilUniversityPune412105India College of Civil Engineering Huaqiao UniversityXiamen361021China College of Transportation and Civil Engineering Fujian Agriculture and Forestry UniversityFuzhou350100China Highway Southeast Engineering Co. Ltd.Xiamen361100China Fuzhou Sinotom Information Technology Co. Ltd.Fuzhou350001China

Renewable energy exploitation is among the development strategies set by the government of Rwanda on the roadmap to 2023/2024 universal electricity access and theUnitedNations plans by *** previous studies oncleanenergy technologies inRwandahavemostly focusedonhouseholds’usagebut there are currentlynostudies describing the feasibility of clean energy technologies for financial *** skepticism on renewable energy in Africa was previously reported by some *** realized that most SACCOs(Savings and Credit Co-Operatives)in Rwanda use diesel technology for backup/emergency electricity supply,taking consideration of abundant solar resources in Rwanda,having seen the viability and feasibility studies from other countries of renewable energy for different institutions(financial included);thiswork uses theHOMEREnergy Software and the electricity load profile of a typical SACCO in Rwanda to analyse the affordability and viability of on-site renewable energy generation for SACCO in *** results reveal that a solar PV systemwith storage can be the optimal solution(with levelized cost of electricity(LCOE)of 0.713$/kWh which is cheaper than 0.73$/kWh for diesel technology)for SACCOs located in both off-grid areas and grid-connected areas(with 0.041$/kWh LCOE which is lower than the current electricity tariff in Rwanda).The findings in this work can serve as basic tools/materials for policy drafters in Rwanda on how financial institutions can contribute to climate change mitigation through self-renewable energy exploitation.

关键词： HOMER energy solar energy SACCO in Rwanda climate change mitigation

A Design of Software and Hardware System for Pre-hospital Emergency Treatment

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Chinese Journal of Biomedical Engineering(English Edition) 2020年第3期29卷 1-9页

作者： Bingxu Ye Feng chen Shaomin Ou Yang Xie yaowen chen The Key Lab of Digital Signal and Image Processing of Guangdong Shantou Guangdong 515063China Shantou University Medical College Shantou Guangdong 515041China The Second Affiliated Hospital of Shantou University Medical College Shantou Guangdong 515041China

This paper aims to improve the pre-hospital first-aid knowledge and pre-hospital first-aid success rate and optimize the pre-hospital emergency *** paper mainly discusses a comprehensive pre-hospital emergency system,which consists of the hardware part and software *** hardware is based on the international cardiopulmonary resuscitation guidelines,and a cardiopulmonary resuscitation(CPR)training auxiliary equipment is developed,which can be applied in pre-hospital first aid training to help people perform accurate chest *** software part is based on the WeChat applet platform to set up a pre-hospital first-aid dispatching system that connects callers and CPR *** software system effectively improves the pre-hospital CPR first-aid system and increases the rescue success rate of cardiac arrest patients.

关键词： Chest compression CPR Auxiliary equipment WeChat applet

重叠式自由贸易区扩张与整合是否改变其对参与国的贡献

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广西大学学报（哲学社会科学版） 2023年第3期45卷 179-194页

作者：张桢林陈瑶雯苏源广西大学经济学院广西民族大学东盟学院国发智库研究院

RCEP作为全球经济体量最大的区域自贸协定,自由化程度将高于目前成员国间的自贸协议,对各国的经济发展与福利分析表明,现行的RCEP框架能促进大多数参与国的国内经济增长。重叠式自由贸易区的扩张与整合对国家带来的影响存在较为明显的... 详细信息

RCEP作为全球经济体量最大的区域自贸协定,自由化程度将高于目前成员国间的自贸协议,对各国的经济发展与福利分析表明,现行的RCEP框架能促进大多数参与国的国内经济增长。重叠式自由贸易区的扩张与整合对国家带来的影响存在较为明显的异质性,对中国产业升级有明显助力,对较为落后的发展中国家有更强的增长效应,对发达国家有较好的福利效应。

关键词： RCEP 一般均衡模型 GTAP模型经济增长自由贸易区

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