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Thermal performances and invisible thermal barrier formation mechanism of arc-shaped metal-fin-enhanced thermally activated building envelopes with directional heat charging feature

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building Simulation 2024年第9期17卷 1461-1489页

作者： Yang Yang Sarula Chen Jiqiang Zhang Zhenya Zhang Shuying Li Kunyu Chen Xiuyi Xiao College of Architecture and Art Hefei University of TechnologyHefei230601China anhui province key laboratory of intelligent building&building energy saving Anhui Jianzhu UniversityHefei230601China School of Architecture and Urban Planning Anhui Jianzhu UniversityHefei230601China College of City Construction Jiangxi Normal UniversityNanchang330022China

Thermally activated building envelopes(TABEs)are multifunctional component that combines structural and energy *** on re-examining the heat charging processes,an arc-shaped metal-fin-enhanced TABE(Arc-finTABE)with directional heat charging features is proposed to optimize the thermal barrier formation process.A comprehensive parameterized analysis is conducted based on a validated mathematical model to explore the influence of 5 fin-structure design parameters and the static insulation *** verified that the directional charging strengthening fins can improve transient thermal performances of Arc-finATBE and enlarge horizontal and vertical sizes of the thermal energy accumulation area surrounding the pipeline,while the maximum growth in extra heat loss is less than 3.17%.From the perspective of promoting heat injection into expected areas,the straight main fin configurations with the angle of main fins of 30°,shank length ratio of 0.4 and no leftward mounted fins are preferred in load-reduction mode,while the angle of main fins of 150°,shank length ratio of 0.8 and multiple fin designs,especially with one of the main fins horizontally toward the indoor side,are more favorable in auxiliary-heating ***,it is recommended to add one arc-shaped branch fin to each main fin to achieve a balance between performance improvement and material ***,branch fins with larger arc angles are preferred in auxiliary-heating mode,while smaller arc angles are conducive to injecting heat into the wall along main fins in load-reduction mode and preventing the heat near the inner surface from being *** the direct influence of the strengthened invisible thermal barrier,Arc-finTABEs can reduce the amount of static insulation layer by 20%–80%while achieving equivalent thermal performances as conventional high-performance walls.

关键词： thermo-activated building envelope thermal barrier formation performance enhancement arc-shaped metal fins fin parameters CFD model

Global hydraulic stability analysis for dynamic regulation in multi-zone variable air volume air-conditioning system

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energy and Built Environment 2024年第4期5卷 592-606页

作者： Tianyi Zhao Zhe Li Xiuming Li Honglian Peng Institute of building energy School of Civil EngineeringFaculty of Infrastructure EngineeringDalian University of TechnologyDalian 116024China anhui province key laboratory of intelligent building&building energy saving Anhui Jianzhu UniversityHefei 230022China School of Metallurgy Northeastern UniversityShenyang 110819China School of Architecture Harbin Institute of TechnologyHarbin150006China

Variable air volume air-conditioning system(VAV system)has multiple control loops that interfered with each other,which has serious impacts on its actual operation *** solve this problem,the index of global hydraulic stability,which takes the physical quantity of the pipe network pressure and the air flow rate as reference,is proposed based on Graph theory,and a pipe network model for the hydraulic calculation is ***,the simulation study based on the actual operation data is carried out in *** distribution of the pressure and the air flow in the pipe network is obtained,and the action interferences among adjacent terminal boxes are analyzed based on global hydraulic stability under damper position regulation strategy(DP strategy)and fan frequency regulation strategy(FF strategy).Results indicate that the FF strategy can decrease the total change distance of the damper position compared with the DP strategy,and then the fluctuation of the pressure and the air flow can be *** contribution of this study is to provide an evaluation index of global hydraulic stability,which can also be used in other air-conditioning systems with multiple terminals and multiple control loops.

关键词： VAV system Global hydraulic stability Adjustment strategy VAV box damper position

A Novel Detection Method for Pavement Crack with Encoder-Decoder Architecture

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Computer Modeling in Engineering & Sciences 2023年第10期137卷 761-773页

作者： Yalong Yang Wenjing Xu Yinfeng Zhu Liangliang Su Gongquan Zhang anhui province key laboratory of intelligent building and building energy saving Anhui Jianzhu UniversityHefei230022China anhui Institute of Strategic Study on Carbon Dioxide Emissions Peak and Carbon Neutrality in Urban-Rural Development Hefei230022China School of Electronic and Information Engineering Anhui Jianzhu UniversityHefei230601China School of Mechanical and Electrical Engineering Anhui Jianzhu UniversityHefei230601China

As a current popular method,intelligent detection of cracks is of great significance to road safety,so deep learning has gradually attracted attention in the field of crack image *** nonlinear structure,low contrast and discontinuity of cracks bring great challenges to existing crack detection methods based on deep ***,an end-to-end deep convolutional neural network(AttentionCrack)is proposed for automatic crack detection to overcome the inaccuracy of boundary location between crack and non-crack *** AttentionCrack network is built on U-Net based encoder-decoder architecture,and an attention mechanism is incorporated into the multi-scale convolutional feature to enhance the recognition of crack ***,a dilated convolution module is introduced in the encoder-decoder architecture to reduce the loss of crack detail due to the pooling operation in the encoder ***,since up-sampling will lead to the loss of crack boundary information in the decoder network,a depthwise separable residual module is proposed to capture the boundary information of pavement *** AttentionCrack net on public pavement crack image datasets named CrackSegNet and Crack500 is trained and tested,the results demonstrate that the AttentionCrack achieves F1 score over 0.70 on the CrackSegNet and 0.71 on the Crack500 in average and outperforms the current state-of-the-art methods.

关键词： Crack detection deep learning convolution neural network pixel segmentation

An interpretable graph convolutional neural network based fault diagnosis method for building energy systems

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building Simulation 2024年第7期17卷 1113-1136页

作者： Guannan Li Zhanpeng Yao Liang Chen Tao Li Chengliang Xu School of Urban Construction Wuhan University of Science and TechnologyWuhan 430065China anhui province key laboratory of intelligent building and building energy-saving Anhui Jianzhu UniversityHefei 230601China State key laboratory of Green building in Western China Xi'an University of Architecture&TechnologyXi'an 710055China key laboratory of Low-grade energy Utilization Technologies and Systems(Chongqing University) Ministry of Education of ChinaChongqing UniversityChongqing 400044China Hubei Provincial Engineering Research Centre of Urban Regeneration Wuhan University of Science and TechnologyWuhan 430081China

Due to the fast-modeling speed and high accuracy,deep learning has attracted great interest in the field of fault diagnosis in building energy systems in recent ***,the black-box nature makes deep learning models generally difficult to *** order to compensate for the poor interpretability of deep learning models,this study proposed a fault diagnosis method based on interpretable graph neural network(GNN)suitable for building energy *** method is developed by following three main steps:(1)selecting NC-GNN as a fault diagnosis model for building energy systems and proposing a graph generation method applicable to the model,(2)developing an interpretation method based on InputXGradient for the NC-GNN,which is capable of outputting the importance of the node features and automatically locating the fault related features,(3)visualizing the results of model interpretation and validating by matching with expert knowledge and maintenance *** was performed using the public ASHRAE RP-1043 chiller fault *** diagnosis results show that the proposed method has a diagnosis accuracy of over 96%.The interpretation results show that the method is capable of explaining the decision-making process of the model by identifying fault-discriminative *** almost all seven faults,their fault-discriminative features were correctly identified.

关键词： fault diagnosis graph neural network building energy system InputXGradient feature interpretation

Study on the evaluation method of diffuse radiation models——taking 5 typical cities in China as examples

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energy and Built Environment 2023年第2期4卷 236-243页

作者： Gang Su Shuangyang Zhang Wanxiang Yao Mengru Hu Haodong Hao School of Control and Mechanical Engineering Tianjin Chengjian UniversityTianjin 300384China anhui province key laboratory of intelligent building and building energy saving Anhui Jianzhu UniversityHefei 230022China building Environment and energy Application Engineering Department Tianjin Key Laboratory of Civil Structure Protection and Reinforcement Tianjin Chengjian UniversityTianjin 300384China State key laboratory of Clean energy Utilization Zhejiang UniversityZhejiang 310027China China Water Resources Beifang Investigation Designand Research Co.LtdTianjin 300202China

Diffuse solar radiation models play an extremely important role in solar photothermal utilization,resource assess-ment and energy consumption simulation,*** accuracy of these diffuse solar radiation models usually need to be evaluated by various statistical *** these statistical parameters,the Global Performance In-dex(GPI)has been extensively employed in recent years because of its comprehensiveness and wide *** paper takes five cities in China as representatives of 5 typical climate regions,and 12 solar scattered radia-tion models are fitted with the meteorological data of 5 *** on the comparative analysis of the existing GPI calculation methods,this paper points out that there are some defects in the existing GPI,and modifies the existing GPI based on the comprehensive consideration of statistical parameters,normalization preprocessing of statistical parameters,unified evaluation direction of parameters,weight redistribution of statistical parameters,and adjustment of extreme coefficient.12 types of new GPI are established in this paper,and the performance of diffuse solar radiation models are compared based on these *** rationality of GPI corrective measures is analyzed by means of the method reasonable index(MRI).The results show that the GPI calculation method(N10)which takes five corrective measures has the best performance,and the accuracy of the existing GPI can be improved by 13.33 to 65%.

关键词： Diffuse solar radiation Evaluation method Global performance index Method reasonable index

An improved transfer learning strategy for short-term cross-building energy prediction usingdata incremental

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building Simulation 2024年第1期17卷 165-183页

作者： Guannan Li Yubei Wu Chengchu Yan Xi Fang Tao Li Jiajia Gao Chengliang Xu Zixi Wang School of Urban Construction Wuhan University of Science and TechnologyWuhan 430065China anhui province key laboratory of intelligent building and building energy-saving Anhui Jianzhu UniversityHefei 230601China State key laboratory of Green building in Western China Xi'an University of Architecture and TechnologyXi'an 710055China College of Urban Construction Nanjing Tech UniversityNo.200North Zhongshan RoadNanjing 210009China key laboratory of Low-grade energy Utilization Technologies and Systems(Chongqing University) Ministry of Education of ChinaChongqing UniversityChongqing 400044China College of Civil Engineering Hunan UniversityChangsha 410082China Hubei Provincial Engineering Research Center of Urban Regeneration Wuhan University of Science and TechnologyWuhan 430065China

The available modelling data shortage issue makes it difficult to guarantee the performance of data-driven building energy prediction(BEP)models for both the newly built buildings and existing information-poor *** knowledge transfer learning(KTL)and data incremental learning(DIL)can address the data shortage issue of such *** new building scenarios with continuous data accumulation,the performance of BEP models has not been fully investigated considering the data accumulation ***,which can learn dynamic features from accumulated data adapting to the developing trend of new building time-series data and extend BEP model's knowledge,has been rarely *** studies have shown that the performance of KTL models trained with fixed data can be further improved in scenarios with dynamically changing ***,this study proposes an improved transfer learning cross-BEP strategy continuously updated using the coarse data incremental(CDI)*** hybrid KTL-DIL strategy(LSTM-DANN-CDI)uses domain adversarial neural network(DANN)for KLT and long short-term memory(LSTM)as the Baseline BEP *** evaluation is conducted to systematically qualify the effectiveness and applicability of KTL and improved ***-world data from six-type 36 buildings of six types are adopted to evaluate the performance of KTL and KTL-DIL in data-driven BEP tasks considering factors like the model increment time interval,the available target and source building data *** with LSTM,results indicate that KTL(LSTM-DANN)and the proposed KTL-DIL(LSTM-DANN-CDI)can significantly improve the BEP performance for new buildings with limited *** with the pure KTL strategy LSTM-DANN,the improved KTL-DIL strategy LSTM-DANN-CDI has better prediction performance with an average performance improvement ratio of 60%.

关键词： building energy prediction(BEP) cross-building data incremental learning(DIL) domain adversarial neural network(DANN) knowledge transfer learning(KTL)

Hydration Characteristics and Mechanical Properties of Cement-Based Materials Modified by Calcined Zeolite and Montmorillonite

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Journal of Renewable Materials 2023年第5期11卷 2191-2207页

作者： Lingling Qin Mengya Zhou Jiahao Yan Ping Duan Yingcan Zhu Wei Chen Zuhua Zhang Aiguo Wang Faculty of Materials Science and Chemistry Key Laboratory of Geological Survey and Evaluation of Ministry of EducationChina University of GeosciencesWuhan430074China key laboratory of Advanced building Materials of anhui province Anhui Jianzhu UniversityHefei230022China Guangxi key laboratory of New energy and building energy saving Guilin University of TechnologyGuilin541004China key laboratory of Road Structure and Materials of Ministry of Transport Chang’an UniversityXi’an710064China Centre for Sustainable Agricultural Systems University of Southern QueenslandToowoombaQLD4350Australia State key laboratory of Silicate Materials for Architectures Wuhan University of TechnologyWuhan430070China key laboratory for Green&Advanced Civil EngineeringMaterials and Application Technology of Hunan province College of Civil EngineeringHunan UniversityChangsha410082China

Montmorillonite and clinoptilolite zeolite were used as representative materials to prepare calcined clay-cement binary cementitious materials in order to study the effect of calcination treatment on the activation of clay minerals and the activity difference between layered and framed clays in this *** influence of different calcined clay content(2%,4%,6%,8%,10%)on the fluidity,compressive strength,microstructure,phase change,and hydration heat of cement-based materials were *** calcined clay improves the fluidity of cement-based materials as compared with the uncalcined *** addition of calcined montmorillonite(CMT)improves the development of mechanical strength,and the optimal compressive strength reaches 85 MPa at 28 days with 8%***,the activity of calcined clinoptilolite zeolite(CZL)is weak with few reaction sites,which slightly reduced the mechanical strength as compared to the blank *** addition of CMT changes the microscopic morphology of hydration products such as C-S-H and C-A-H,leading to the formation and transformation of ettringite in the early *** promotes the gradual polymerization of Si-O bonds into Si-O-Si bonds simultaneously,which accelerates the early hydration ***,CZL acts mainly as a filling function in the cementitious *** brief,CMT as an admixture can improve the mechanical properties of cement,but CZL has little *** work provides a guideline for the applications of calcined clay in cement,considering the influence of clay type on workability and mechanical strength.

关键词： Calcined clay cement montmorillonite clinoptilolite zeolite mechanical strength hydration

Conductivity enhancement of PEDOT：PSS film via sulfonic acid modification： application as transparent electrode for ITO-free polymer solar cells

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Science China Chemistry 2018年第9期61卷 1179-1186页

作者： Zhiqiang Zhao Qing Liu Wenfeng Zhang Shangfeng Yang Hefei National laboratory for Physical Sciences at Microscale Key Laboratory of Materials for Energy Conversion of Chinese Academy of Sciences Department of Materials Science and Engineering Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Hefei 230026 China School of Engineering Anhui Agricultural University Hefei 230036 China Collaborative Innovation Center of Henan province for energy-saving building Materials Xinyang Normal University Xinyang 464000 China

3-Hydroxy-1-propanesulfonic acid(HPSA)was applied as a modification layer on poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)(PEDOT:PSS)film via spin-coating,resulting in a massive boost of the conductivity of PEDOT:PSS film,and thus the as-formed PEDOT:PSS/HPSA bilayer film was successfully used as a transparent electrode for ITO-free polymer solar cells(PSCs).Under the optimized concentration of HPSA(0.2 mol L^(-1)),the PEDOT:PSS/HPSA bilayer film has a conductivity of 1020 S cm^(-1),which is improved by about 1400 times of the pristine PEDOT:PSS film(0.7 S cm^(-1)).The sheet resistance of the PEDOT:PSS/HPSA bilayer film was 98Ωsq^(-1),and its transparency in the visible range was over 80%.Both parameters are comparable to those of ITO,enabling its suitability as the transparent *** to atomic force microscopy(AFM),UV-Vis and Raman spectroscopic measurements,the conductivity enhancement was resulted from the removal of PSS moiety by methanol solvent and HPSA-induced segregation of insulating PSS chains along with the conformation transition of the conductive PEDOT chains within PEDOT:*** applying PEDOT:PSS/HPSA bilayer film as the transparent electrode substituting ITO,the ITO-free polymer solar cells(PSCs)based on poly[N-9″-hepta-decanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′,3′-benzothiadiazole)]:[6,6]-phenyl C71-butyric acid methyl ester(PC_(71)BM)(PCDTBT:PC_(71)BM)active layer exhibited a power conversion efficiency(PCE)of 5.52%,which is comparable to that of the traditional ITO-based devices.

关键词： polymer solar cells PEDOT:PSS 3-hydroxy-1-propanesulfonic acid conductivity transparent electrode

Influences of Multi-Component Supplementary Cementitious Materials on the Performance of Metakaolin Based Geopolymer

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Journal of Renewable Materials 2022年第7期10卷 1813-1828页

作者： Wu Jing Ren Luo Sha Ding Ping Duan School of Civil Engineering and Architecture Wuhan University of TechnologyWuhan430070China Wuhan Hanyang Municipal Construction Group Co. Ltd.Wuhan430050China Faculty of Materials Science and Chemistry Key Laboratory of Geological Survey and Evaluation of Ministry of EducationChina University of GeosciencesWuhan430074China Guangxi key laboratory of New energy and building energy saving Guilin University of TechnologyGuilin541004China Zhejiang Institute China University of Geosciences(Wuhan)Hangzhou311305China key laboratory of Advanced building Materials of anhui province Anhui Jianzhu UniversityHefei230022China key laboratory of Road Structure and Materials of Ministry of Transport Chang’an UniversityXi’an710064China

In this study,the workability and reaction mechanism of metakaolin(MK)based geopolymer blended with rice husk ash(RHA)and silica fume(SF)was *** prepared samples were subjected to tests including compressive strength and fluidity tests.X-ray diffraction(XRD)and Scanning electron microscope(SEM)were employed to explore the phase composition and microstructure of *** molecular bonding information of geopolymer was provided by Fourier transform infrared spectroscopy(FTIR).Meanwhile,the porosity of geopolymer was obtained by Mercury intrusion porosimeter(MIP)*** high-activity RHA obtained after calcination at 600℃ was used as a supplementary cementitious material to prepare *** properties of preventing morphology cracking and compressive strength are *** addition of RHA and SF changes the working performance of MK based geopolymer and provided a theoretical basis for future practical ***,the high chemical activity of SF and RHA contributes to the healing of microcracks.

关键词： Rice husk ash silica fume metakaolin geopolymer