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Modeling and management performances of distributed energy resource for demand flexibility in Japanese zero energy house

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Building Simulation 2023年第11期16卷 2177-2192页

作者： Yanxue Li Xiaoyi Zhang Fu Xiao weijun gao Yan Liu Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdao266033China Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityHong KongChina Faculty of Environmental Engineering The University of KitakyushuKitakyushu808-0135Japan

Zero-energy buildings(ZEBs)can contribute to decarbonizing building energy systems,while the energy mismatch between energy demand and on-site stochastic generation in ZEBs increases the need for energy flexibility.This study proposed mixed-integer linear programming energy management schemes for optimizing the flexible scheduling of distributed energy resources,including battery energy storage,heat pump,and building thermal mass as a passive thermal energy storage system.With optimally designed objectives,this study used case studies to evaluate the flexibility potential provided by the demand-side management,considering dynamic characteristics of the process.The results showed that the proposed demand-side management for battery storage offers significant potential in increasing photovoltaic(PV)self-consumption and reducing operational costs.Cost reduction ratios of flexible dispatch of combined PV and battery storage systems exceed 15%.Flexible coupling of PV and heat pump systems for meeting hot water demand can reduce energy cost by more than 20%.The flexible coupling of the heat pump and PV system also had a significant impact on the power consumption pattern of domestic heat pumps,the load-shifting potential highly depends on the available PV generation and hot water demand.The optimal trade-off between thermal energy use and thermal comfort violation may not reduce the total energy used for space heating,the increased PV consumption helped reduce grid imports.The study provides insights into the energy flexibility behavior and efficiency of the proposed demand-side management for ZEBs,which is expected to provide guidelines for exploring demand-side flexibility.

关键词： energy flexibility zero-energy building distributed energy resources energy system management

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Preliminary data on effects of different street vegetation on stress recovery

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Building Simulation 2023年第11期16卷 2109-2121页

作者： Chao Liu Nan Zhang Jiaxin Li Jing Shi weijun gao Yanan Yu Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdao266033China College of Architecture and Urban Planning Qingdao University of TechnologyQingdao266033China

Streets are important public spaces in daily life,and their stress-relieving abilities help to improve people’s physical and mental health.To investigate the effects of different types of street vegetation on people’s stress recovery,this study used virtual reality technology to establish five street scenes with different vegetation types,including a non-vegetated street,a street with trees,a street with trees and grass,a street with trees and hedges,and a street with trees,grass,and flowers.Twenty-four participants completed the Trier Social Stress Test and then watched the five street scenes for stress recovery.Participants rated the vegetated streets as significantly better at reducing stress than the non-vegetated street.Compared with the non-vegetated street,the participants’POMS scores decreased by 2.59-12.09 and ROS scores increased by 0.83-3.67 after watching the vegetated streets,indicating significant improvement in mood(P<0.001).HRV data showed that the combination of trees,grass,and flowers was the most effective for stress recovery(LF/HF=0.67±0.42;pNN50=27.41%±16.32%).EEG data showed that participants’alpha power was 0.05-0.66µV2 higher and mental stress scores based on brainwave power were 0.23-0.37 points lower in the vegetated streets than in the non-vegetated street.The occipital and frontal regions showed the most positive responses to changes in vegetation elements,and alpha brainwaves in the O2 channel were the most active.Therefore,the streets with vegetation were more conducive to stress recovery than the non-vegetated street.It is thus suggested to integrate trees,grass,flowers,and other vegetation types along streets.

关键词： street vegetation stress recovery HRV EEG

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The effect of classroom wall color on learning performance: A virtual reality experiment

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Building Simulation 2022年第12期15卷 2019-2030页

作者： Chao Liu Yalin Zhang Limei Sun weijun gao Qiuyun Zang Jiaxin Li Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdao 266033China College of Architecture and Urban Planning Qingdao University of TechnologyQingdao 266033China

The wall color has the certain impact on the learning performance of college students in the classroom.To find the suitable wall color to improve the learning performance,this study used the virtual reality(VR)technology to build five virtual classrooms with yellow,red,white,blue,and green walls,while the subjective evaluation and objective physiological indicators of college students were collected.The subjective survey showed the cold-colored walls such as blue and green had the highest levels of relaxation and pleasure,while the warm-colored walls such as yellow and red had the better attention and learning performance.And the white-walled classroom had the lowest subjective evaluation and the worst learning performance,but the white wall was widely used in the present class room.Physiological test results showed the yellow wall had the higher HRV-nLF/nHF and low-β&high-βfrequencies in the FP2 channel in the frontal,but the white wall had the lowest scores.Moreover,the correlation analysis had confirmed electroencephalography(EEG)and electrocardiogram(ECG)indicators could be employed to evaluate the learning performance.These findings provide an effective reference for the spatial design of university classrooms and a basis for the study of physiological indicators.

关键词： learning performance color virtual reality electroencephalography university classroom

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Study on the challenge and influence of the built thermal environment on elderly health in rural areas:Evidence from Shandong,China

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建筑模拟(英文) 2023年第8期16卷 1345-1360页

作者： Yanxue Li Yue Gu Zhihui Li Xiaoyi Zhang weijun gao Fu Xiao Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyFushun Road 11Qingdao 266033China Department of Building Environment and Energy Engineering The Hong Kong Polytechnic UniversityHong KongChina Qingdao Women and Children’s Hospital Tongfu Road 6Qingdao 266000China Faculty of Environmental Engineering The University of KitakyushuKitakyushu808-0135Japan

Elderly health is increasingly recognized as a worldwide challenge with the continuous social aging trend.This study aimed to investigate the thermal conditions of the elderly in rural areas of Shandong,China.The thermal sensation and physiological response performances of elderly participants were examined in their own houses.Results show a clear seasonal pattern in cardiovascular disease mortality,cold stress increases the cardiovascular disease risk.The coal-based stoves serve as the main source of home heating and their limited coverage of the room area gave rise to poor quality of thermal comfort.The analysis of skin temperature for those under 65 and above did not reveal any significant difference in response to different indoor temperatures.The regression results confirm that a colder home leads to a rising value of the elderly’s systolic blood pressure,rising by more than 1 mmHg for every 1℃decrease in indoor temperature and thus posing a greater risk of cardiovascular diseases.The systolic blood pressure value of older subjects rise more when they are exposed to decreasing indoor temperatures,possibly due to an age-related decline in their ability to maintain stability of blood pressure.It is noteworthy that the average blood velocity of older subjects reduces less in response to decreasing indoor temperatures,indicating a weakened capacity to resist cold stress and its associated high risk of hypertension.This investigation provides evidence in favor of improving the thermal environment of the elderly and reducing their risk of cardiovascular diseases.

关键词： rural house thermal environment cardiovascular diseases physiological parameters elderly

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Field Investigation and Comparison Analysis of Low-Grade Heat Pump Technologies in Building Space Heating Projects

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Energy Engineering 2022年第1期119卷 63-81页

作者： Yanxue Li weijun gao Xiaoyi Zhang Wenya Xu Yingjun Ruan Yinzhong Wang Innovation Institute for Sustainable Maritime Architecture Research and Technology Qingdao University of TechnologyQingdao266033China Faculty of Environmental Engineering The University of KitakyushuKitakyushu808-0135Japan Institute of Mechanical Engineering Tongji UniversityShanghai200092China Dongying Electric Power Company Dongying257000China

The building sector contributes a large ratio of final energy consumption,and improving building energy efficiency is expected to play a significant role in mitigating its carbon dioxide emission.Herein,we collected the on-site measurement data to investigate the techno-economic performances of different heat pump types that exist in building space heating projects in Qingdao,China.An in-depth analysis revealed the temperature variations of measured low-grade heat sources over the whole heating supply period,and urban sewage water shows high stable heat energy quality compared with seawater and geothermal heat resources.Operational behaviors including cycling inlet and outlet temperature of the selected heat pumps were illustrated,and analysis evaluated detailed effects of operational parameters on energy efficiency performances.Then the relationship between COPs distributions of heat pumps and operational conditions was examined further,and the positive effect of the rising temperature of heat sources on energy efficiency improvement of heat pump is highlighted when the heating supply temperature is higher.Furthermore,we analyzed the economic and carbon emission performance of the heat pump system,and results show that electricity price plays a vital role in the lifespan energy cost saving potential,and the heat pump could serve as a promising approach in reducing CO_(2) related to the building space heating.Finally,we recommended suggestions for improving the overall energy efficiency and cost competitiveness of decentralized heat pump systems for building space heating.

关键词： On-site measurement heat pumps heating supply operational performance

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Quantifying the spatiotemporal characteristics of ecosystem services and livelihoods in China’s poverty-stricken counties

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Frontiers of Earth Science 2021年第3期15卷 553-579页

作者： Lilei ZHOU Dongjie GUAN Xingzhong YUAN Mengjie ZHANG weijun gao Faculty of Architecture and Urban planning Chongqing UniversityChongqing 400030China Key Lab of Three Gorges Reservoir Region Eco-Environment(Ministry of Education) Chongqing UniversityChongqing 400030China Faculty of Environmental Engineering University of KitakyushuKitakyushu 808-0135Japan College of Architecture and Urban Planning Chongqing Jiaotong UniversityChongqing 400074China

Understanding the coupling relationship between ecosystem services and poverty livelihoods is a prerequisite for poverty eradication and ecological protection in China.In this paper,we intended to quantify the coupling relationship between ecosystem services and poverty livelihoods in 717 poverty-stricken counties in China.First,we identified distinct levels of ecosystem services and poverty respectively in the poverty-stricken areas based on the ecosystem services subsystem index and poverty livelihoods subsystem index.Then,we calculated the coupling degree and coupling coordination degree between the ecosystem services and the poverty livelihoods in China^poverty-stricken counties from 2000 to 2015.Finally,we analyzed the temporal and spatial evolution of the coupling between ecosystem services and poverty livelihoods.The results indicate that the ecosystem services showed a trend of first decreasing and then increasing,while the poverty level showed an increased trend.In addition,the coupling relationship between ecosystem services and poverty livelihoods in poverty-stricken counties was also improved from 2000 to 2015.However,the coupling degree value or coupling coordination degree values in some counties or contiguous impoverished areas showed a decreased trend,the coupling relationship between ecosystem services and poverty livelihoods in those counties or areas was higher conflict.Future more,the coupling relationship in China's poverty-stricken counties was mainly intermediate conflict and low conflict,which need to improve in the future.Thus,it is suggested that effective measures are required to lift ecosystem services out of the poverty trap and into sustainable livelihoods.

关键词： ecosystem services poverty livelihoods coupling degree coupling coordination degree coupling relationship spatiotemporal characteristic

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基于电磁理论和热力学方法的太赫兹波空-天-地-海衰减模型

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无线电通信技术 2024年第1期50卷 96-105页

作者：杨志荣高惟君韩充上海交通大学太赫兹无线通信实验室上海200240

太赫兹(Terahertz, THz)频段(0.1~10 THz)可以提供数十GHz的连续带宽,以实现6G通信系统中的天地一体化网络(Space-Air-Ground Integrated Network, SAGIN)。然而,太赫兹波与SAGIN中信道介质的相互作用仍然是一个谜。太赫兹波在太空-大气... 详细信息

太赫兹(Terahertz, THz)频段(0.1~10 THz)可以提供数十GHz的连续带宽,以实现6G通信系统中的天地一体化网络(Space-Air-Ground Integrated Network, SAGIN)。然而,太赫兹波与SAGIN中信道介质的相互作用仍然是一个谜。太赫兹波在太空-大气-地表-海面(空-天-地-海)信道中所遭受到的吸收和散射效应可被建模为太赫兹光子与介质粒子的碰撞过程,在此基础上结合电磁理论和热力学方法提出了通用的太赫兹波空-天-地-海衰减模型。相比已有模型,该模型考虑了各类粒子(包括凝聚态粒子、单个分子和自由电子)所导致的衰减效应,涵盖了太赫兹波在传播过程中所能遇到的衰减效应。基于该模型对太赫兹波在大气和外层空间的传播损耗进行数值计算,计算结果表明,除自由空间损耗(Free-Space Path Loss, FSPL)外,其他衰减效应在50 km以上的大气都可以忽略不计,而在50 km以下的大气中则需要考虑这些衰减效应。

关键词：太赫兹通信传播损耗信道天地一体化网络

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Research on Passive Design Optimization about an Experimental Rural Residence in Hot Summer and Cold Winter Region of China

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Journal of Building Construction and Planning Research 2016年第3期4卷 131-156页

作者： Qian Wu weijun gao School of Civil Engineering and Architecture Zhejiang University of Science and Technology Hangzhou China Faculty of Environmental Engineering The University of Kitakyushu Kitakyushu Japan

In China, rural residential environment under the poor construction measures has not been satisfactory due to the backward infrastructure of countryside and the lacking of professional planning, which will result in considerable amount of energy consumption in the future. The economy of rural residences in the hot summer and cold winter region of China is relative developed, but the indoor thermal environmental quality is not so good. In this paper, the design strategies directed by passive design ideas for a small experimental rural residential building located in Hangzhou city was introduced and researched in response to hot summer and cold winter climate. Through modeling solution undertaken by Ecotect software, the building performance was simulated and analyzed for the optimization of design factors, such as shape, roof angle, insulation system, shading devices, as well as day-lighting system. Based on the above study, a set of appropriate energy-saving technologies were provided for improving the new rural residences construction in Hangzhou, which should also be recommended to other projects constructed in the same climate region.

关键词： Hot Summer and Cold Winter Region Rural Residence Passive Design Simulation

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腹腔镜手术治疗急腹症的临床有效性评估分析

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中外医疗 2024年第5期43卷 82-85页

作者：高维军刘秀珍诸城市中医医院山东潍坊262200

目的探讨腹腔镜手术治疗方案在急腹症患者临床治疗中的效果。方法单纯随机选取2021年1月—2022年12月诸城市中医医院的150例急腹症患者为研究对象,遵循单双号分组原则,平均分为对照组和观察组,各75例。对照组使用常规开腹手术治疗,观... 详细信息

目的探讨腹腔镜手术治疗方案在急腹症患者临床治疗中的效果。方法单纯随机选取2021年1月—2022年12月诸城市中医医院的150例急腹症患者为研究对象,遵循单双号分组原则,平均分为对照组和观察组,各75例。对照组使用常规开腹手术治疗,观察组使用腹腔镜手术治疗。比较两组治疗效果。结果观察组临床总疗效(97.33%)高于对照组(88.00%),差异有统计学意义(χ^(2)=4.807,P<0.05)。治疗后,观察组各血清炎症因子指标、临床指标、并发症发生率均低于对照组,差异有统计学意义(P均<0.05)。结论对急腹症患者实施腹腔镜手术治疗,可以显著提升其临床疗效,减少并发症发生概率,同时可以更好地调节各项炎症因子指标,有助于缩短手术及住院时间,提高康复效果。

关键词：急腹症腹腔镜手术临床疗效并发症发生率

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Present Assessment of Public Traffic System Based on GIS in Kitakyushu

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Open Journal of Civil Engineering 2014年第4期4卷 397-405页

作者： Kazuyuki Watari weijun gao Faculty of Environmental Engineering The University of Kitakyushu Kitakyushu Japan Geo Cluster Co. LTD Japan

With increasing of serious environment problems and the coming of the aging society, new traffic systems should be urgently rebuilt. It is necessary to evaluate the traffic service level by utilizing new technique and tool. This paper takes Kitakyushu city as case study to carry out an evaluation of urban traffic system. The concept of accessibility and mobility is used to evaluate the present condition of existing public traffic system based on GIS technology, and then establishment of new route is discussed according to the evaluation results. Additionally, this paper established GIS database and illustrated the relationship between the public traffic and population density. The regions without enough existing traffic were identified. Moreover, the essential terms and considerations were put forward to simulate a new route of public traffic line.

关键词： Urban Public Traffic GIS Technology Kitakyushu Japan

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