Behind The Paper: Genetic algorithm-based assessment of kinetic façade prototypes for energy optimization and user comfort: a hotel case study in Iran

Every paper tells a story but most of that story remains invisible behind the final polished version. This research began with a simple question: how can we design building façades that are not only energy-efficient, but also truly responsive to human comfort in challenging climates?
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Springer International Publishing
Springer International Publishing Springer International Publishing

Genetic algorithm-based assessment of kinetic façade prototypes for energy optimization and user comfort: a hotel case study in Iran - Discover Sustainability

Abstract Hotel buildings in hot-humid climates face complex design challenges due to continuous occupancy, diverse functional spaces, and high demands for energy efficiency and occupant comfort. This study investigated how kinetic façade systems can address these challenges by dynamically adapting to environmental conditions. Three façade prototypes—a hexagonal rotating panel system, a Rec-Tri Pro sliding system, and the Al Bahar design inspired by Islamic geometric principles—were modeled and evaluated using environmental simulation tools in Grasshopper (Ladybug and Honeybee). A multi-objective genetic algorithm (Octopus) was employed to perform more than 1800 simulation-based optimization runs. Performance was assessed using four indicators: Energy Use Intensity (EUI), Daylight Autonomy (DA), Discomfort Glare Probability (DGP), and Predicted Mean Vote (PMV). The results indicate that each façade system demonstrated distinct performance strengths. The Al Bahar configuration exhibited the most balanced overall performance, achieving high daylight autonomy (74.8%), controlled glare levels (DGP < 0.35), and stable thermal comfort (PMV ranging between − 0.1 and + 0.4). In contrast, the Rec-Tri system achieved the lowest optimized energy consumption (~ 104.8 kWh/m2). These conclusions are based on a comparative multi-criteria assessment rather than prioritizing a single performance indicator. This study proposed a replicable five-stage framework to support the early-stage design and optimization of responsive kinetic façades in hospitality buildings through integrated simulation and standardized comparative evaluation methods. Graphical Abstract Highlights Kinetic façades integrated with GA for climate-based hotel design optimizationFirst study comparing Hexagon, Rec-Tri Pro, and Star façades in Sari’s climateRec-Tri Pro had lowest energy use intensity (~ 104.8 kWh/m2/year)Star prototype showed best daylight autonomy (~ 74.8%) and glare control (DGP ~ − 3.34)Hexagon prototype offered the most balanced performance among all metrics

 What followed was a long and often demanding journey. One of the most difficult parts was identifying the right kinetic façade prototypes and translating them into working parametric models. Each system whether rotating, sliding, or folding had its own logic, and implementing them accurately was far from straightforward. Many times, models did not behave as expected, simulations failed, or results contradicted assumptions. What appears as a clear comparison in the paper was, in reality, the result of repeated trial and error.

At the same time, conducting this research without access to advanced facilities particularly in Iran, added another layer of challenge. Limited resources meant that every step required more time, creativity, and persistence. Tasks that might be straightforward in well-equipped environments often became complex and time-consuming.Data collection and analysis were equally demanding. Running hundreds of simulations, checking outputs, and ensuring consistency across different performance metrics required continuous energy and focus. There were moments of exhaustion and doubt, especially when progress felt slow or uncertain. Staying motivated throughout this process was, in itself, a challenge.

Yet, over time, patterns began to emerge. Each façade system revealed its own strengths and trade-offs, and the complexity of the problem became clearer. This was perhaps the most rewarding moment when scattered results started to form a coherent narrative, and the research question began to find its answer. Looking back, this paper is not only about kinetic façades or optimization techniques. It is about persistence in the face of limitations, about learning through failure, and about continuing the process even when it becomes difficult. The challenges were not separate from the research—they were part of what shaped it.

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Sustainable Architecture/Green Buildings
Technology and Engineering > Civil Engineering > Building Construction and Design > Sustainable Architecture/Green Buildings
Architecture
Humanities and Social Sciences > Arts > Architecture
Energy Conservation
Physical Sciences > Earth and Environmental Sciences > Environmental Sciences > Energy Policy, Economics and Management > Energy and Behaviour > Energy Conservation
Model Building and Simulation
Humanities and Social Sciences > Society > Sociology > Sociological Methods > Sociological Quantitative Methods > Model Building and Simulation
Housing and Built Environments
Humanities and Social Sciences > Society > Population and Demography > Human Geography > Urban Geography and Urbanism > Housing and Built Environments

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