Narjes Abbasabadi, & Mehdi Ashayeri. (2025). From tweets to energy trends (TwEn2): social sensing–informed urban building energy modeling. Frontiers in Energy Research, 13. https://doi.org/10.3389/fenrg.2025.1688348
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Abstract
This study builds on our previous research, “From Tweets to Energy Trends (TwEn)” framework, which demonstrated the potential of social media interactions to inform urban energy predictions through a data-driven approach. Building on this foundation, we introduce TwEn2, a hybrid data-driven and physics-based modeling framework that advances the framework by enabling building-level analysis of urban-scale energy use with greater spatial specificity and enhanced applicability for urban building energy modeling (UBEM). The framework integrates geo-tagged social sensing data from the X platform with the U.S. Department of Energy’s prototype building models—focusing on mid-sized and large multifamily residential buildings across New York City’s boroughs—and benchmarking records. Tweet activity within building footprints is analyzed as a proxy for occupant presence and behavior, allowing assessment of correlations between human social dynamics and both measured and simulated monthly energy use across electricity, natural gas, and total energy consumption. By incorporating heigh fidelity social-sensing-data into physics-based simulations, TwEn2 improves predictive accuracy and enables UBEM informed by human activity patterns, validated against empirical benchmarking data. This framework provides a scalable, generalizable tool for urban energy modeling, planning, resilience and sustainability strategies, demonstrating the potential of social media as a real-time indicator of occupant dynamics to support informed energy management in cities.
Alam, M. S., & Abbasabadi, N. (2026). A CFD-Integrated Parametric Framework for Evaluating Passive Carbon-Capture Enclosure Performance. Architecture, 6(2), 65. https://doi.org/10.3390/architecture6020065
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Abstract
Integrating direct air carbon capture (DAC) into buildings offers a promising pathway for reducing atmospheric CO2, yet the role of architectural design in enhancing passive carbon-capture performance remains underexplored. This study presents a computational framework developed to optimize architectural design and enclosure geometry for enhanced passive airflow, using mass-flow rate as a proxy for the comparative assessment of carbon absorption potential. Implemented within Rhino3D and Grasshopper using Ladybug and Eddy3D, the workflow integrates weather data and CFD simulation to compute segmented mass-flow rates through stacked capture trays. The framework simplifies traditionally complex CFD processes by introducing a custom segmented mass-flow calculation approach that enables comparative performance assessment during early-stage design. Results confirm the validity of the proposed workflow, revealing that façade rotation can modify total mass flow by up to 96.5%; seasonal wind variability can cause airflow to range from approximately 8.5 kg/s in January to 169.5 kg/s in May in Seattle. Spatial configuration can alter airflow by up to an order of magnitude and introduce substantial spatial heterogeneity within capture zones. This research establishes a performance-driven design framework that enables architectural geometry to actively enhance passive carbon-capture integration, positioning building design as a measurable contributor to climate mitigation strategies. Ultimately, this work bridges architectural design and carbon-capture engineering, supporting interdisciplinary approaches to scalable, climate-responsive building systems.
Keywords
direct air capture; computational fluid dynamics; carbon-positive solutions; climate-responsive architecture; sustainable design; nature-based solutions; design computation
Abbasabadi, N., Moroseos, T. F., Ashayeri, M., & Meek, C. (2026). AI-Enhanced Urban Building Energy Modeling for Health-Driven Decarbonization in Vulnerable Communities. Architecture, 6(2), 84. https://doi.org/10.3390/architecture6020084
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Abstract
Retrofitting existing residential buildings is a critical strategy for achieving urban decarbonization while addressing public health disparities, particularly in communities disproportionately affected by environmental and socioeconomic stressors. This study presents a scalable urban building energy modeling framework that integrates physics-based simulations with machine learning to evaluate and prioritize health-driven retrofit strategies across residential building stocks. Synthetic datasets were generated through parametric simulations of representative building archetypes and retrofit scenarios, capturing variations in envelope performance, HVAC systems, infiltration rates, and ventilation strategies. Machine learning models were trained as surrogate predictors of building energy performance, enabling the rapid evaluation of retrofit impacts. A range of algorithms—including decision trees, random decision forests, gradient-boosting machines, support vector machines, k-nearest neighbors, and artificial neural networks—were evaluated. An artificial neural network implemented as a multilayer perceptron was selected for further analysis due to its strong predictive performance (R2 = 0.94) and ability to capture complex nonlinear relationships among retrofit variables. The final model used the Port optimization algorithm for stable convergence and improved generalization. The framework is applied to Seattle’s Duwamish Valley, a community experiencing disproportionate environmental and health burdens, and is generalizable and transferable to other cities with comparable residential building stocks across a range of climatic and environmental contexts. The results highlight retrofit priorities—particularly infiltration reduction, HVAC upgrades, and improved envelope performance—that deliver co-benefits for energy efficiency, indoor environmental quality, and occupant health. The results demonstrate that machine learning-enhanced physics-based UBEM can significantly accelerate retrofit evaluation while preserving the interpretability of simulation-based approaches. The proposed framework provides a scalable approach for identifying health-informed retrofit pathways that support equitable urban decarbonization.
Keywords
urban building energy modeling; machine learning; health-driven energy retrofits; indoor environmental quality; decarbonization
Worthy, A., Ashayeri Mehdi, Marshall, J. D., & Abbasabadi Narjes. (2026). A Framework for Augmenting Simulation-Based Building Energy Models with Earth Observational Microclimate Data Using Machine Learning Predictions. Urban Science, 10(7), 341. https://doi.org/10.3390/urbansci10070341
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Abstract
Accurate urban building energy modeling (UBEM) is constrained by mismatches between standard climate inputs and actual urban microclimate conditions. This study introduces a scalable, bottom-up, framework that integrates EnergyPlus building energy modeling simulation outputs with Earth observational and geographical-based urban morphology data, which are enhanced through machine learning techniques to improve energy demand predictions in urban settings. Applied to Los Angeles (LA), California, we evaluate the representativeness of typical meteorological year (TMYx) sampling sites against actual urban environmental conditions. We find that while satellite-derived surface temperatures show reasonable alignment with average city conditions, significant discrepancies are observed in urban form metrics such as tree cover, street cover, and building density, suggesting that TMYx stations should be placed in denser urban areas. We augment EnergyPlus simulations for 19 single-family buildings, with remote sensing data using machine learning models, to generate city-wide residential energy consumption heatmaps corrected for microclimate conditions. Models capture substantial intra-urban variation, with predicted energy use differing by approximately 10% between neighborhoods. Feature importance analysis highlights land surface temperature as a key predictor, underscoring its relevance to building energy research. We also find the majority of TMY3 sampling sites to be in low-vulnerability areas, underscoring the structural mismatch that is embedded in urban form and climate. This framework offers a scalable path for integrating urban microclimate effects into energy modeling to enable more precise and equitable energy policy and planning.
Keywords
urban microclimates; urban building energy use; Earth observational data; infrastructure equity
Abbasabadi, N., Worthy, A., Zhang, Z., Zhao, Y., & Liu, Y. (2026). An AI-augmented urban building energy Modeling framework integrating physics-based simulation, machine learning, and computer vision: The CityEnerTwin UBEM module. Energy and Buildings, 369, Article 117984. https://doi.org/10.1016/j.enbuild.2026.117984
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Abstract
Urban Building Energy Modeling (UBEM) plays a critical role in evaluating urban decarbonization strategies, but its accuracy and scalability are often constrained by simplified building archetype, limited façade-level data, and the computational cost of large-scale scenario analysis. This study presents the CityEnerTwin UBEM module, an artificial intelligence (AI)-augmented, physics-based framework that integrates modular workflows for computer vision–based façade semantic enrichment, localized archetype development, predictive and surrogate machine learning (ML), and climate-informed analysis to support scalable and computationally efficient urban energy modeling. Specifically, these workflows combine validated Vision Transformer (ViT)-based façade feature extraction methods for deriving material properties and window-to-wall ratio (WWR) from street-view imagery, K-means clustering for localized archetype development, and two complementary ML modeling streams: predictive models trained on measured operational energy data and surrogate models trained on synthetic UBEM simulation data for rapid retrofit scenario evaluation. Demonstrated on the University of Washington campus, the framework reduced campus-scale simulation error relative to measured energy consumption from 27.8% to 15.8%, while image-derived WWR inputs improved agreement for representative buildings from 23% to 20%. Predictive modeling using Random Forest (RF) achieved a test R2 of 0.88 and identified occupancy, building scale, and geometric efficiency as the dominant predictors of energy demand. Surrogate modeling using an Artificial Neural Network (ANN) achieved a test R2 of 0.98 and identified roof insulation, WWR, and shading depth as the most influential retrofit parameters, enabling rapid retrofit scenario evaluation. The results demonstrate the potential of integrated physics-based and data-driven workflows to improve UBEM representation, scalability, and computational efficiency for urban decarbonization planning. As the analytical core of the broader CityEnerTwin platform, the module connects spatially indexed building data and model outputs with interactive visualization to support urban-scale energy analysis and decision making.
Keywords
Urban building energy Modeling; Physics-based simulation; Computer vision; Machine learning; Surrogate Modeling; Retrofit scenario analysis
Borjigin, O., Sturts Dossick, C., Treece, B., Thonstad, T., Bernard, T., & Motley, M. (2026). Developing digital twins for bridge infrastructure: Roadmap and challenges from a proof-of-concept R&D study. Journal of Information Technology in Construction (ITcon), 31, 917-938. https://doi.org/10.36680/j.itcon.2026.039.
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Abstract
The exploration of Digital Twins (DT) technology in the Architecture, Engineering, Construction, and Operation (AECO) industry has gained momentum in recent years, with numerous studies proposing frameworks for its development. However, few real-world infrastructure applications have been systematically documented to guide future practitioners and researchers. This study addresses this gap by providing an empirical example of DT design and development through a proof-of-concept research and development (R&D) project. The I-90 Homer M. Hadley Bridge (I-90 Bridge) DT project, led by the University of Washington (UW) DT research team, was selected as a case study to demonstrate the application of DT technology for bridge health monitoring. Using a vignette-style narrative approach, the study integrates data from semi-structured interviews with project team members and project documentation generated during the project to illustrate how the system was conceptualized, developed, and delivered. The findings reveal that interoperability emerged as a consistent theme throughout the project, including technical challenges (legacy systems, proprietary programming, lack of standardization) and organizational challenges (multi-stakeholder engagement, organizational silos). Recognizing these challenges can help practitioners and researchers better identify key problems to address, thereby supporting a successful adoption of DT technologies.
Keywords
Digital Twins; Bridge Infrastructure; Organizational Interoperability; Technical Interoperability; Research & Development; Case Study
BE PhD Candidate Ori Borjigin received the Best Research Poster award at the 2026 Construction Industry Institute (CII) Annual Research Conference in Denver, CO on July 22nd, 2026. The poster featured research on the I-90 Digital Twin project, which is a collaboration between the Mobility Innovation Center, and faculty from the Departments of Construction Management and Civil and Environmental Engineering. View the Poster here. Related news items: Digital twin – proof of technology evaluation on the I-90 Homer Hadley floating…
My research is deeply rooted in the intersection of advanced technology and the construction industry. I am particularly interested in the exploration and application of Building Information Modeling (BIM) and Virtual Design and Construction (VDC). Beyond these technological frontiers, sustainable engineering holds a special place in my academic pursuits. I am dedicated to merging innovative technology with sustainable methods, aiming for a construction industry that is both advanced and environmentally responsible.
Ling, C., Chen, P., Chu, Y.-C., & Shen, Q. (2026). Not all teleworkers reduce travel: An intensity-dependent behavioral framework with explainable machine learning. Transport Policy, 187, Article 104267. https://doi.org/10.1016/j.tranpol.2026.104267
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Abstract
Previous studies have yielded mixed findings on the relationship between teleworking and travel, possibly due to overlooking teleworking intensity and its evolving impacts. This study examines how teleworking is associated with overall vehicle miles traveled (VMT) and vehicle travel time (VTT) across a spectrum of intensities, measured by the number of remote-work days per week. Using travel survey data in the Puget Sound Region, Washington, we estimate four explainable machine learning models (XGBoost with SHAP) that incorporate behavioral, socio-demographic, and built-environmental characteristics. Results find an intensity-dependent relationship among typical workers. Low-intensity teleworking (1 day/week) is associated with increased travel both pre- and post-pandemic, while moderate teleworking (2 days/week) shows near-neutral or marginally positive associations. In contrast, regular teleworking (3–5 days/week) is correlated with reduced travel. In 2023, teleworking intensity ranks among the top six contributors, accounting for 6.84% and 4.08% of model explainability for VMT and VTT, respectively, higher than in 2017. The reductions scale with intensity. Holding other factors constant, high-frequency teleworkers (3 days/week) in 2023 accrued approximately 10 fewer miles and 3 fewer minutes per five-day workweek than fully on-site workers, whereas full teleworkers (5 days/week) saved 19 fewer miles and 23 fewer minutes. These impacts are concentrated among high-frequency teleworkers with longer commute distances, while the effects are mixed among shorter-distance commuters. Teleworking can moderate impacts of other factors, such as commute distance, income, and population density. These findings help reconcile prior inconsistencies, showing that teleworking's role depends on intensity rather than simple adoption.
Research Interests: Machine learning, work from home, urban economics, transportation policy, urban data science, economic inequality