Dr. Iason Konstantzos is an Assistant Professor of Architectural Engineering at University of Nebraska – Lincoln. Committed to human-centric building design and operation, he has been pursuing research on human perception and human-building interaction, smart sensing systems, control paradigms, and design guides focused on indoor environmental quality. His work has achieved broad impact in the indoor environmental research field, as well as in the fenestration and lighting industry, and he has been heavily involved in ASHRAE in multiple roles, currently serving as Chair for the TC4.5 for Fenestration. Iason holds Bachelor’s and Master’s degrees from the National Technical University of Athens (NTUA) in Greece, and a PhD degree from Purdue University.

Areas of Research and Professional Interest

• Human Comfort in the Built Environment
• Building Envelope Design and Operation
• Building Energy Analysis and Simulation
• Lighting and Daylighting
• Smart Buildings, Sensors and Controls

Research Profiles:

• Google Scholar
• ResearchGate

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Funding

Selected Projects:

• Smart and Connected Childcare (Smart and Connected Communities - National Science Foundation - $83,867) 
• Virtual/Augmented Discipline Exploration Rotations for Improved Engineering Student Engagement, Self-Efficacy, Diversity Awareness, and Retention (IUSE - National Science Foundation - $493,001)
• Intelligent Environments for Older Adults (Future of Building Industry - $50,000)
• Harnessing walking variability to reduce falls in older adults (Nebraska Research Initiative - $150,000)
• Efficient Airport Foreign Object Detection with Small Unmanned Aerial System, Adaptive Lighting, and Machine Learning (Nebraska Collaboration Initiative - $40,000)
• An Intelligent Building Framework to Promote Adaptive Building Operation (Nebraska Research Initiative - $39,239)
• Assessment of the Use of Augmented Reality and BIM in Medical Care (Nebraska Research Initiative - $20,000)
• Augmented Reality for Avatar-Based Metronomes to Improve Human Movement (Nebraska Research Initiative - $40,000)
• Enhanced Imaging Frameworks against Future Outbreaks of COVID-19 (COVID19 Rapid Grant - $32,266)
• A New Paradigm for the Ηuman-centered Οperation of Αdaptive Βuildings (Startup Funding)
• Operational and Design Characteristics of Circadian Lighting Systems (UCARE)

Selected Publications

In international refereed journals:

1. Soleimani Javid, A., Konstantzos, I., (2025). Non-Intrusive Infrared Facial Thermography for Personal Thermal Sensation Prediction Models: A Field Study. Building and Environment, 112606
2. Kent, M., Ko, WH, Konstantzos, I., Schiavon, S. MacNaughton, P., Wilkins, AJ. (2024). The design of window shades and fenestration for view clarity. Lighting Research and Technology, 14771535241261270
3. Soleimani Javid, A., Konstantzos, I., Liu, X. (2024). Challenges and Opportunities of Occupant-centric Building Controls in Real-world Implementation: a critical review. Energy and Buildings 113958
4. Kumar, S., Underwood, S. H., Masters, J. L., Manley, N. A., Konstantzos, I., Lau, J., ... & Wang, L. M. (2023). Ten questions concerning smart and healthy built environments for older adults. Building and Environment, 110720.
5. Kuhlenengel, M., Waters, C., Konstantzos, I. (2021). The Effects of the Visual Environment on K-12 Student Achievement. Buildings 11(11), 498
6. Ko, W. H., Schiavon, S., Altomonte, S., Andersen, M., Batool, A., Browning, W., ..., Konstantzos, I., … & Wienold, J. (2022). Window View Quality: Why It Matters and What We Should Do. LEUKOS, 18(3), 259-267.
7. Quek, G., Wienold, J., Khanie, KS., Erell, E., Kaftan, E., Tzempelikos, A., Konstantzos, I., Christoffersen, J., Kuhn, T., Andersen, M. (2021). Comparing performance of discomfort glare metrics in high and low adaptation levels. Building and Environment, 206, 108335.         
8. Kim, M., Konstantzos, I., Tzempelikos. (2020). Real-time daylight glare control using a low-cost, window-mounted HDRI sensor. Building and Environment 106912
9. Konstantzos, I., Sadeghi, S. A., Kim, M., Xiong, J., & Tzempelikos, A. (2020). The effect of lighting environment on task performance in buildings–a review. Energy and Buildings, 110394.
10. Wienold, J, Iwata, T., Khanie, MS, Erell, E., Kaftan, E., Rodriguez, RG, Garreton, YA, Tzempelikos, T., Konstantzos, I., Christoffersen, J., Kuhn, TE., Pierson, C., Andersen, M., (2019). Cross-validation and robustness of daylight glare metrics. Lighting Research and Technology, 1477153519826003 
11. Konstantzos, I., Kim, M., Tzempelikos, A. (2018). An integrated method and web tool to assess visual environment in spaces with window shades. Science and Technology for the Built Environment. 24(5), 470-482.
12. Xiong, J., Tzempelikos, A., Bilionis, I., Awalgaonkar, N., Lee, Konstantzos, I., Sadeghi, SA, Karava,P. (2018). Inferring personalized visual satisfaction profiles in daylit offices from comparative preferences using a Bayesian approach. Building and Environment, 138, 74-88
13. Konstantzos, I., Tzempelikos, A. (2017). Daylight glare evaluation with the sun in the field of view through window shades. Building and Environment. 113, 65-67.
14. Sadeghi, SA, Karava, P., Konstantzos, I., Tzempelikos, A. (2016). Occupant interactions with shading and lighting systems using different control interfaces: a pilot study. Building and Environment 97, 177-195.
15. Konstantzos, I., Chan, Y. C., Seibold, J., Tzempelikos, A., Proctor, R. W., & Protzman, B. (2015). View Clarity Index: a new metric to evaluate clarity of view through window shades. Building and Environment, 90, 206-214.
16. Konstantzos, I., Tzempelikos, A., & Chan, Y. C. (2015). Experimental and simulation analysis of daylight glare probability in offices with dynamic window shades. Building and Environment 87, 244-254.
17. Chan, Y. C., Tzempelikos, A., & Konstantzos, I. (2015). A systematic method for selecting roller shade properties for glare protection. Energy and Buildings, 92, 81-94.

In international conference proceedings:

1. Erfani Moghaddam, MA., Konstantzos, I. “Evaluating multi-zone temperature variability and adaptive HVAC control strategies in a residential-like environment”. Accepted in CISBAT International Conference, Lausanne, Switzerland, September 2025.
2. Erfani Moghaddam, MA., Konstantzos, I. “Towards a novel intelligent and fully interactive IoT framework for residential buildings”, CISBAT International Conference, Lausanne, Switzerland, September 2023.
3. Soleimani Javid, A., Konstantzos, I. “An evaluation of ensemble machine learning algorithms for predicting thermal sensation using the ASHRAE Comfort Database II”, ASHRAE Annual Conference, Tampa, June 2023.
4. Hummel, K., Ryherd, E., Konstantzos, I., & Raikes, A. “Applying unsupervised machine learning clustering techniques to early childcare soundscapes.” In Proceedings of Meetings on Acoustics (Vol. 50, No. 1). AIP Publishing.
5. Munyer, T., Brinkman, D., Zhong, X., Huang, C., & Konstantzos, I. (2022). Foreign Object Debris Detection for Airport Pavement Images based on Self-supervised Localization and Vision Transformer. arXiv preprint arXiv:2210.16901.
6. Soleimani Javid, A., Konstantzos, I. “Smart Low-cost Thermal Imaging Acquisition Towards Personal Comfort Prediction”, Herrick High Performance Buildings Conference, July 2022.
7. Kuhlenengel, M., Waters, C., Konstantzos, I. “Assessing the impact of outside view on learning: a close look to EN 17037 ‘view out’ practices through the analysis of 220 classrooms”, CISBAT International Conference, Lausanne, Switzerland, September 2019.
8. Kim, M., Konstantzos, I., Tzempelikos, A. “A low-cost stereo-fisheye camera sensor for daylighting and glare control”, CISBAT International Conference, Lausanne, Switzerland, September 2019.
9. Kim, M., Konstantzos, I., Tzempelikos, A. “A New Control Framework For The Visual Environment Based On Low-Cost HDR Luminance Acquisition”, Proceedings of 5^th High Performance Buildings conference at Purdue, July 2018
10. Konstantzos I., Tzempelikos, A. “An Online Interactive Tool to Assess Visual Environment in Offices with Roller Shades”, CISBAT International Conference, Lausanne, Switzerland, September 2017
11. Konstantzos, I. Tzempelikos, A., "Selecting shading properties based on glare mitigation, energy performance and connection to the outdoors", Proceedings of BSA2017: Building Simulation Applications Conference, Bolzano, Italy, February 2017.
12. Konstantzos, I., Tzempelikos A., “A holistic approach for improving visual environment in private offices”. Proceedings of SBE 16, Thessaloniki, October 2016
13. Konstantzos, I., Tzempelikos A., “Daylight Glare Evaluation when the Sun is Within the Field of View Through Window Shades”, Proceedings of 4^th High Performance Buildings Conference at Purdue, July 2016.
14. Konstantzos I., Tzempelikos, A. “Design recommendations for perimeter office spaces based on visual performance criteria”, CISBAT International Conference, Lausanne, Switzerland, September 2015. 
15. Konstantzos I., Tzempelikos, A. “Daylight Glare Probability Assessment with Shading Controls”, ASHRAE Winter Conference, Chicago, January 2015.
16. Chan, Y-C. Konstantzos I. A. Tzempelikos, “Annual Daylight Glare Evaluation for Typical Perimeter Offices: Simulation Models versus Full-Scale Experiments Including Shading Controls”, ASHRAE Annual conference, Seattle, June 2014.
17. Konstantzos, I., Tzempelikos, A. “Daylight glare probability measurements and correlation with indoor illuminances in a full-scale office with dynamic shading controls”, Proceedings of 3rd High Performance Buildings Conference at Purdue, July 2014.

Technical Documents and Reports

• ASHRAE GPC 45P (2025) - Measurement of Whole Building Performance for Occupied Buildings except Low-Rise Residential Buildings (Visual Environment Subgroup leader) – Under Public Review
• Report of Multidisciplinary Taask Group (MTG) on Health and Wellness in the Built Environment (HWBE), ASHRAE Environmental Health Committee (EHC) – September 2022