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Experimental study on thermal sensation and physiological parameter changes under the interaction of environmental temperature and taste 环境温度与味觉交互作用下热感觉及生理参数变化的实验研究
IF 6.6 2区 工程技术
Energy and Buildings Pub Date : 2025-06-30 DOI: 10.1016/j.enbuild.2025.116093
Li Tong, Mingzhi Zhang, Songtao Hu, Xiaoxia Zhang
{"title":"Experimental study on thermal sensation and physiological parameter changes under the interaction of environmental temperature and taste","authors":"Li Tong,&nbsp;Mingzhi Zhang,&nbsp;Songtao Hu,&nbsp;Xiaoxia Zhang","doi":"10.1016/j.enbuild.2025.116093","DOIUrl":"10.1016/j.enbuild.2025.116093","url":null,"abstract":"<div><div>The thermal environment is a crucial part of the indoor environment and can exert influences on people’s thermal sensation as well as emotional changes. Taste, being a significant physiological sensation of the human body, also has an impact on human physiology and psychology. However, there is no clear conclusion on whether different tastes have different effects on thermal sensation at different environmental temperatures. This study aims to investigate the interaction between various environmental temperatures and tastes which has an impact on the changes in human thermal sensation and physiological parameters. Thirty subjects were selected for the experiment, where data such as subjective questionnaires, average skin temperature, core temperature and heart rate were collected. Three environmental temperatures (18°C, 22°C, 26°C) and five tastes (tasteless, salty, sweet, sour and bitter) were set. The results indicated that sweet taste enhanced human thermal sensation in cooler and neutral environments, whereas sour taste diminished it in warmer and neutral environments. Salty and bitter tastes did not affect thermal sensation. In the case of different environmental temperatures, the core temperature of the same taste decreased, the average skin temperature and heart rate increased as the environmental temperature rose. There was basically no variation in each objective parameter of different tastes at the same environmental temperature. This study not only complements the existing research in the related field concerning the influence of taste on human thermal sensation, but also furnishes a scientific foundation for creating a comfortable and healthy environment for humans.</div></div>","PeriodicalId":11641,"journal":{"name":"Energy and Buildings","volume":"345 ","pages":"Article 116093"},"PeriodicalIF":6.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144557162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
RCSGAN: Residual feature cycle semi-generative adversarial network for chillers fault diagnosis under extremely scarce labeled data RCSGAN:残差特征循环半生成对抗网络在极稀缺标记数据下的冷水机组故障诊断
IF 6.6 2区 工程技术
Energy and Buildings Pub Date : 2025-06-30 DOI: 10.1016/j.enbuild.2025.116085
Xuejin Gao , Zhiyuan Zhang , Huayun Han , Huihui Gao , Yongsheng Qi
{"title":"RCSGAN: Residual feature cycle semi-generative adversarial network for chillers fault diagnosis under extremely scarce labeled data","authors":"Xuejin Gao ,&nbsp;Zhiyuan Zhang ,&nbsp;Huayun Han ,&nbsp;Huihui Gao ,&nbsp;Yongsheng Qi","doi":"10.1016/j.enbuild.2025.116085","DOIUrl":"10.1016/j.enbuild.2025.116085","url":null,"abstract":"<div><div>The fault diagnosis of chillers is of significant importance for equipment maintenance and energy saving. Semi-supervised learning based methods alleviate the model’s rigid dependence on labeled data by learning from the information contained in a large amount of unlabeled data. However, the dynamic coupling characteristics and multi-fault severity levels of chillers result in poor inter-class separability of their data in low dimensional space, making existing models struggle to extract sufficient information from unlabeled data, and their performance tends to rely heavily on the number of labeled samples. Therefore, a fault diagnosis method based on residual feature cycle semi-generative adversarial network (RCSGAN) is proposed. This method enhances the inter-class separability by extracting residual features, allowing the model to mine more effective information from unlabeled data. Additionally, a cyclic training strategy combined with a novel pseudo-label selection method is proposed to further reduce the model’s reliance on the quantity of labeled data. Experimental results on the ASHRAE Research Project 1043 (RP-1043) dataset and real datasets show that the proposed method still achieves good fault diagnosis performance even in scenarios with extremely scarce labeled data. With only one labeled sample per category, RCSGAN improves the fault diagnosis accuracy by 26.16% compared with the current advanced methods on the RP-1043 dataset.</div></div>","PeriodicalId":11641,"journal":{"name":"Energy and Buildings","volume":"345 ","pages":"Article 116085"},"PeriodicalIF":6.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144536046","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Benchmarking Danish, Estonian and Finnish NZEB requirements with European Commission recommendations in residential and office buildings 将丹麦、爱沙尼亚和芬兰的NZEB要求与欧盟委员会对住宅和办公楼的建议进行比较
IF 6.6 2区 工程技术
Energy and Buildings Pub Date : 2025-06-30 DOI: 10.1016/j.enbuild.2025.116086
Raimo Simson , Kirsten Engelund Thomsen , Kim Bjarne Wittchen , Jarek Kurnitski
{"title":"Benchmarking Danish, Estonian and Finnish NZEB requirements with European Commission recommendations in residential and office buildings","authors":"Raimo Simson ,&nbsp;Kirsten Engelund Thomsen ,&nbsp;Kim Bjarne Wittchen ,&nbsp;Jarek Kurnitski","doi":"10.1016/j.enbuild.2025.116086","DOIUrl":"10.1016/j.enbuild.2025.116086","url":null,"abstract":"<div><div>Comparing building energy performance across countries is challenging due to varying climatic conditions, calculation methods, primary energy (PE) factors, and input data discrepancies. This study systematically compares nearly zero-energy building (NZEB) requirements and energy calculation methodologies between Denmark, Finland, and Estonia, using a new office building, an apartment building, and a single-family house—each designed to comply with the respective national NZEB requirements. To account for climatic differences, a heating-degree-days correction factor was applied to thermal transmittance values of building envelope components. NZEB requirements of each country were then compared against the European Commission (EC) recommended values (EU 2016/1318) through normalization and benchmarking, employing detailed dynamic simulations. Both national and standardized (EN 16798–1:2019) input data was used with country-specific climate. In the benchmarking analysis, simulated primary energy performances were evaluated against EC NZEB thresholds, and the on-site renewable energy generation required to meet these targets was quantified. Results show that Estonian NZEB align with EC recommendations for Nordic climates, but EC Oceanic benchmarks were unmet even when Estonian configuration were applied to Danish climate indicating that the Oceanic benchmark is more ambitious than Nordic. Danish and Estonian national NZEB PE thresholds for office buildings showed a gap of 7% and 23%, respectively, to meet EC recommendations. However, the case study office building, surpassing Estonian NZEB standards, met both Nordic and Oceanic EC benchmarks. Finnish NZEB requirements were readily met by the case study buildings, highlighting that Finnish NZEB thresholds are currently less stringent compared to those of Denmark, Estonia, and the EC recommendations.</div></div>","PeriodicalId":11641,"journal":{"name":"Energy and Buildings","volume":"345 ","pages":"Article 116086"},"PeriodicalIF":6.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144548799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Thermal comfort in mixed-mode cooled houses: A field study in the hot-humid climate of Danang, Vietnam 混合模式制冷房屋的热舒适:越南岘港湿热气候的实地研究
IF 6.6 2区 工程技术
Energy and Buildings Pub Date : 2025-06-30 DOI: 10.1016/j.enbuild.2025.116091
Dung Le , Ineko Tanaka , Qingyuan Zhang , Ryogo Mayama
{"title":"Thermal comfort in mixed-mode cooled houses: A field study in the hot-humid climate of Danang, Vietnam","authors":"Dung Le ,&nbsp;Ineko Tanaka ,&nbsp;Qingyuan Zhang ,&nbsp;Ryogo Mayama","doi":"10.1016/j.enbuild.2025.116091","DOIUrl":"10.1016/j.enbuild.2025.116091","url":null,"abstract":"<div><div>Natural ventilation is an essential efficient energy strategy for cooling in hot and humid tropical regions. In Vietnam, however, increasing living standards led to a significant rise in the use of air conditioners in housing, resulting in elevated energy consumption. Typically, natural ventilation and fans serve as the primary cooling method throughout the house, while air conditioners—mainly installed in bedrooms—are used only when residents are present and feel hot. Although this mixed-mode cooling method has gained popularity, the indoor thermal environment remains underexplored within the context of Vietnam’s thermal environment. This paper presents the results of an investigation into indoor thermal conditions and residents’ sensations under mixed-mode cooled environments in humid tropical Danang, Vietnam. The study encompasses both air-conditioned and naturally ventilated spaces for a comprehensive comparison. Measurements on environmental parameters and a survey on thermal sensation were conducted among 60 households in Danang from August − October 2022 and June – August 2023. Despite being in a coastal area, the houses were poorly ventilated, and indoor temperatures were often higher than outdoor temperatures. However, most residents reported satisfaction with their indoor conditions. The PMV index was found ineffective in predicting the thermal sensation of houses utilizing a mixed-mode cooling approach. A small group of respondents may have adjusted their expectations to accommodate their actual indoor thermal environment. The study provides insight into indoor thermal conditions and residents’ sensations in the context of Danang housing for further energy-saving initiatives and home thermal comfort.</div></div>","PeriodicalId":11641,"journal":{"name":"Energy and Buildings","volume":"345 ","pages":"Article 116091"},"PeriodicalIF":6.6,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522986","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Radiative property tests of cooling coatings: A round robin campaign 冷却涂层的辐射性能测试:循环试验
IF 6.6 2区 工程技术
Energy and Buildings Pub Date : 2025-06-29 DOI: 10.1016/j.enbuild.2025.116073
Yue He , Biao Lu , Yuan Zhi , Huibo Zhang , Hui Yu , Yanghua Lu , Rongbing Wan , Lixin Sun , Hanyu Yang , Quan Zhou , Jianhua Zhao , Ziqi Wang , Wenli Xia , Peng Ren , Huijun Mao , Yan Liu , Shuoyan Wang , Chi Feng
{"title":"Radiative property tests of cooling coatings: A round robin campaign","authors":"Yue He ,&nbsp;Biao Lu ,&nbsp;Yuan Zhi ,&nbsp;Huibo Zhang ,&nbsp;Hui Yu ,&nbsp;Yanghua Lu ,&nbsp;Rongbing Wan ,&nbsp;Lixin Sun ,&nbsp;Hanyu Yang ,&nbsp;Quan Zhou ,&nbsp;Jianhua Zhao ,&nbsp;Ziqi Wang ,&nbsp;Wenli Xia ,&nbsp;Peng Ren ,&nbsp;Huijun Mao ,&nbsp;Yan Liu ,&nbsp;Shuoyan Wang ,&nbsp;Chi Feng","doi":"10.1016/j.enbuild.2025.116073","DOIUrl":"10.1016/j.enbuild.2025.116073","url":null,"abstract":"<div><div>Radiative cooling is an emerging technology for scenarios requiring space cooling. Radiative property tests of cooling materials are critical for evaluating the cooling performance and energy-saving potential. However, there is a lack of quantitative analysis of the impact of laboratory qualifications on testing results. This study reported a round robin campaign initiated by Chongqing University (China) and participated by seven other academic institutes. In this campaign, six cooling coatings were selected as target materials. The radiative properties — shortwave reflectivity, hemispherical emissivity and atmospheric window emissivity — of the coatings were tested. Based on the testing results, material errors, repeatability errors and reproducibility errors were analyzed. The results revealed that there were certain differences in the radiative properties of the coatings due to their inherent properties. In general, different coatings exhibited varying material errors (0.01%–2.66%), which, although small, were challenging to eliminate. Meanwhile, the radiative property tests showed excellent repeatability, with repeatability errors below 1.00%, confirming that the tests themselves were reliable under proper control. However, significant differences between laboratories (reproducibility errors ranging from 2.03% to 7.40%) suggested that differences in instrument models and operators could lead to significant deviations in the results. This, in turn, severely affected the evaluation accuracy of the coatings’ cooling performance. Therefore, stricter and more detailed protocols are needed to improve the reproducibility for radiative property tests of the coatings.</div></div>","PeriodicalId":11641,"journal":{"name":"Energy and Buildings","volume":"345 ","pages":"Article 116073"},"PeriodicalIF":6.6,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
High-resolution building stock energy model for assessing the impact on the load curve of residential space heating electrification 住宅采暖电气化对负荷曲线影响的高分辨率建筑存量能量模型
IF 6.6 2区 工程技术
Energy and Buildings Pub Date : 2025-06-29 DOI: 10.1016/j.enbuild.2025.116069
Valentin Moreau , Marie-Hélène Laurent , Thomas Berthou , Bruno Duplessis , Pascal Stabat
{"title":"High-resolution building stock energy model for assessing the impact on the load curve of residential space heating electrification","authors":"Valentin Moreau ,&nbsp;Marie-Hélène Laurent ,&nbsp;Thomas Berthou ,&nbsp;Bruno Duplessis ,&nbsp;Pascal Stabat","doi":"10.1016/j.enbuild.2025.116069","DOIUrl":"10.1016/j.enbuild.2025.116069","url":null,"abstract":"<div><div>Assessing the impact of space heating electrification on the power demand requires high-resolution building stock energy models. A bottom-up white-box model offers the possibility to explicitly account for the impact of energy efficiency measures or behavioral changes. Although, these models require significant parametrization effort, and while they can reach the appropriate level of resolution, their validation is often performed at a coarse resolution.</div><div>This paper proposes a calibration and validation of the hourly space heating electrical load curve of the French residential stock. A representative sample of the French households based on a survey of 4,000 households is used to simulate the residential space heating load curve with simplified lumped capacitance (RC) models. A representative panel of the French household consisting of 6,000 smart meters is used to build a statistical estimation of the residential load curve.</div><div>At the national level, the model is accurate with a (CV)RMSE of 9% and a NMBE of 3%. The model remains quite accurate at finer scales. For 25 specific segments of the stock, the median (CV)RMSE is 22%, NMBE is 10% even if a few segments exhibit higher deviation or compensation errors. The model is fit for assessing future load curve warping based on explicit changes in energy efficiency of sufficiency measures.</div></div>","PeriodicalId":11641,"journal":{"name":"Energy and Buildings","volume":"345 ","pages":"Article 116069"},"PeriodicalIF":6.6,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
A RL-based human behavior oriented optimal ventilation strategy for better energy efficiency and indoor air quality 基于rl的人类行为导向的最佳通风策略,以提高能源效率和室内空气质量
IF 6.6 2区 工程技术
Energy and Buildings Pub Date : 2025-06-29 DOI: 10.1016/j.enbuild.2025.116072
Wenzhe Shang , Junjie Liu , Han Meng , Lizhi Jia , Xilei Dai
{"title":"A RL-based human behavior oriented optimal ventilation strategy for better energy efficiency and indoor air quality","authors":"Wenzhe Shang ,&nbsp;Junjie Liu ,&nbsp;Han Meng ,&nbsp;Lizhi Jia ,&nbsp;Xilei Dai","doi":"10.1016/j.enbuild.2025.116072","DOIUrl":"10.1016/j.enbuild.2025.116072","url":null,"abstract":"<div><div>In biological cleanrooms for pharmaceutical and biosafety laboratories, escalating cleanliness standards have made the high energy consumption associated with increased air change rates in ventilation systems untenable. Moreover, stringent pressure differential requirements are crucial in biological cleanrooms to ensure the physical isolation of pathogenic microorganisms. This study developed a multi-zone ventilation system model for a biopharmaceutical cleanroom using the Modelica language. A deep reinforcement learning (DRL) model was implemented in Python based on the actor–critic and proximal policy optimization (PPO) algorithms, utilising the Modelica model as the training environment. To maintain particulate matter (PM) concentrations and conserve energy, the DRL control model was trained to adjust air damper positions by identifying patterns in occupancy changes and pollutant concentration dynamics across various times and workspaces within the cleanroom. Results indicated that, relative to the conventional baseline control strategy, the developed reinforcement learning control approach achieved a 14.7 % reduction in energy consumption while maintaining pollutant concentrations within regulatory limits for cleanrooms, culminating in annual energy savings of 11,212.8 kWh. Additionally, pressure fluctuation ranges in the three controlled work zones of the cleanroom were diminished by 59.16 %, 9.58 %, and 29.32 %, respectively. SHapley Additive explanation (SHAP) analysis was employed to elucidate the contributing factors influencing the outputs of the developed DRL control model. Furthermore, the generalisation of the DRL control model was discussed by altering the control period and inner source of the PM.</div></div>","PeriodicalId":11641,"journal":{"name":"Energy and Buildings","volume":"345 ","pages":"Article 116072"},"PeriodicalIF":6.6,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Carbon mitigation and energy efficiency of hybrid cross-laminated timber buildings: A case study on a community center design 混合交叉层压木结构建筑的碳减排和能源效率:以社区中心设计为例
IF 6.6 2区 工程技术
Energy and Buildings Pub Date : 2025-06-28 DOI: 10.1016/j.enbuild.2025.116060
Yujin Kang, Sumin Kim
{"title":"Carbon mitigation and energy efficiency of hybrid cross-laminated timber buildings: A case study on a community center design","authors":"Yujin Kang,&nbsp;Sumin Kim","doi":"10.1016/j.enbuild.2025.116060","DOIUrl":"10.1016/j.enbuild.2025.116060","url":null,"abstract":"<div><div>Achieving carbon neutrality in the building sector requires innovative materials such as cross-laminate timber (CLT), energy-efficient solutions, renewable energy, and advanced building technologies to reduce greenhouse gas (GHG) emissions and enhance efficiency. This study evaluates the carbon mitigation potential of CLT as a nature-based solution (NBS) through substitution scenarios in a small-scale regional community center. The process begins with identifying potential building materials and a baseline model using traditional concrete. CLT is integrated as a hybrid material for walls and floors, substituting concrete in varying ratios to evaluate the life cycle carbon emissions and energy efficiency improvements. Key stages of the life cycle assessment (LCA) include material production, construction, operation, and end-of-life. Substituting concrete with CLT reduces GHG emissions by up to 9.22%, with the product stage showing the highest potential for carbon mitigation. The use stage also demonstrates significant reductions owing to the superior thermal performance of CLT, particularly in terms of operational energy consumption, where heating accounts for 88% of the energy savings in cold climates. Additionally, the study highlights the benefits of extending building lifespans and integrating renewable energy during the operation phase. Hybrid CLT buildings with higher exterior substitution ratios, as seen in scenarios S3-1 and S3-2, exhibit notable improvements in energy efficiency and life cycle emissions. Unlike previous studies, this study provides a focused analysis of the substitution rates, serving as a foundation for future large-scale timber construction. Continued research on detailed assemblies and optimized low-carbon designs is essential for advancing sustainable high-rise timber construction.</div></div>","PeriodicalId":11641,"journal":{"name":"Energy and Buildings","volume":"345 ","pages":"Article 116060"},"PeriodicalIF":6.6,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144504648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Comprehensive investigation of rooftop photovoltaic systems in apartment buildings: Focus on installation status and generation performance in South Korea 公寓屋顶光伏系统的综合调查:关注韩国的安装现状和发电性能
IF 6.6 2区 工程技术
Energy and Buildings Pub Date : 2025-06-28 DOI: 10.1016/j.enbuild.2025.116067
Ruda Lee, Jaewon Kim, Dongsu Kim, Jongho Yoon
{"title":"Comprehensive investigation of rooftop photovoltaic systems in apartment buildings: Focus on installation status and generation performance in South Korea","authors":"Ruda Lee,&nbsp;Jaewon Kim,&nbsp;Dongsu Kim,&nbsp;Jongho Yoon","doi":"10.1016/j.enbuild.2025.116067","DOIUrl":"10.1016/j.enbuild.2025.116067","url":null,"abstract":"<div><div>Rooftop photovoltaic (PV) systems in residential buildings play an essential role in reducing on-site electricity demand and promoting energy efficiency. While adoption has increased in recent years, the absence of robust policies for proper operation and maintenance presents a barrier to maximizing their potential. Inadequate management often leads to performance degradation, undermining both environmental and economic benefits. To address this issue, the present study investigates the installation characteristics and actual power generation performance of rooftop PV systems in South Korea apartment buildings, including existing ones. Despite the significant challenge posed by the severe lack of detailed data, such as design drawings, installation status, and applied system information, particularly for existing buildings, this study made extensive efforts to collect as much data as possible. Furthermore, this research integratively analyzed representative variables affecting power generation performance, including PV module performance, installation, and maintenance quality, which have not been comprehensively addressed in previous literature. These variables were categorized into constructional, installation, operation and maintenance (O&amp;M) factors. This integrated approach enhances understanding of the factors contributing to reduced power generation and supports the identification of effective countermeasures. The analysis revealed that single maximum power point tracking (MPPT) central inverters were frequently used regardless of environmental conditions, and approximately 20 % of installed systems had arrays oriented in different directions. While most systems showed good performance with an average daily yield of over 3.54 h/d, about 30 % exhibited signs of degradation. Four major causes were identified: mismatch, data loss, shading, and hardware defects. This study provides qualitative and quantitative analysis from the energy supply side, a perspective often lacking in policy discussions, and was conducted to reduce the gap between policy and research.</div></div>","PeriodicalId":11641,"journal":{"name":"Energy and Buildings","volume":"345 ","pages":"Article 116067"},"PeriodicalIF":6.6,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144522349","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
Evaluating the Operational Performance in Cairo’s Public Administrative Buildings: Stock Characterisation and Typical Energy Use 评估开罗公共行政建筑的运营绩效:库存特征和典型能源使用
IF 6.6 2区 工程技术
Energy and Buildings Pub Date : 2025-06-27 DOI: 10.1016/j.enbuild.2025.116065
Amr Auf Hamada , Sung-Min Hong , Rokia Raslan
{"title":"Evaluating the Operational Performance in Cairo’s Public Administrative Buildings: Stock Characterisation and Typical Energy Use","authors":"Amr Auf Hamada ,&nbsp;Sung-Min Hong ,&nbsp;Rokia Raslan","doi":"10.1016/j.enbuild.2025.116065","DOIUrl":"10.1016/j.enbuild.2025.116065","url":null,"abstract":"<div><div>As Egypt relocates its government to the New Administrative Capital, significant investments will be directed towards the renovation and adaptive reuse for Cairo’s existing public administrative buildings. Maximising the outcomes from these investments through energy efficiency measures offers a valuable opportunity, yet limited knowledge of building stock characteristics and operational energy performance can potentially hinder the formulation of informed and effective retrofit decisions. This study identifies and examines the stock subject to relocation, providing insights on building age, area, and common architectural characteristics. Applying K-Means clustering by age bands, the analysis identified three primary building groups within this stock: pre-1930 (Khedivial), 1960 s (modernist), and post-1980 (contemporary).</div><div>Given that 1960 s buildings were found to represent the largest proportion of the stock, metered energy consumption data for nine buildings as such were collected and analysed. Annual energy data indicate that most buildings consume, on average, approximately half of a World Bank-adopted benchmark, offering novel projections of potentially diminished retrofit savings. Monthly energy consumption analysis highlighted seasonal energy profiles: a fixed low winter monthly energy use of about 5 % of the annual EUI, contrasting with peak summer monthly energy use of about 13 % of the annual EUI. These typical seasonal profiles helped with evaluating a typical energy end-use breakdown: about 40 % for cooling, and 60 % for lighting and electric equipment combined. Supporting effective retrofit decision-making, this study presented the first known characterisation of Cairo’s public administrative building stock, proposed a methodology for analysing metered energy consumption that counteracted data availability limitations, and provided preliminary estimates for energy breakdown by end-use that disentangled the aggregated metering for the fully electrified consumption in Cairo’s public administrative buildings.</div></div>","PeriodicalId":11641,"journal":{"name":"Energy and Buildings","volume":"346 ","pages":"Article 116065"},"PeriodicalIF":6.6,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144504641","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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
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