Smart Materials for Adaptive Building Facades
Improving Indoor Climate and Building Performance through Material Intelligence
E.M.I. Adam (TU Delft - Architecture and the Built Environment)
E.R. van den Ham – Mentor (TU Delft - Architecture and the Built Environment)
M. Bilow – Graduation committee member (TU Delft - Architecture and the Built Environment)
Maria Sara Di Maggio – Graduation committee member (Arup)
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Abstract
The built environment is responsible for a large share of global energy consumption. Where façades play a crucial role in regulating the interaction between indoor and outdoor conditions. While adaptive façades can improve indoor climate performance, many existing systems rely on motors, sensors and complex control systems. This research investigates how smart materials can be integrated into adaptive building façades to improve indoor climate performance and reduce energy demand.
The study follows a mixed-method approach consisting of a literature review, material evaluation, design development, physical prototyping and building performance simulations. First, different categories of smart materials were analysed and evaluated for façade integration. Shape Memory Alloys were selected for further development. This because of their temperature-responsive behaviour, reversible actuation, relatively high actuation force and suitability for passive façade applications.
The selected SMA was translated into a passive adaptive natural ventilation component. The design uses the linear contraction of an SMA wire to activate a Scotch yoke mechanism. Which rotates a set of lamellas to open and close the ventilation component. Experimental testing confirmed that the SMA wire can generate sufficient force and contraction to actuate the mechanism. The design was evaluated through building performance simulations in DesignBuilder and EnergyPlus. Using both a reference room and the Hartje Noord case study in Amsterdam.
The simulation results show that adaptive natural ventilation can reduce overheating when cooler outdoor air is available, especially during the evening, night and early morning. However, passive ventilation alone was not sufficient to maintain thermal comfort during peak summer conditions. The most promising result was found in the hybrid scenario. Where adaptive ventilation was combined with active cooling. In this case, the summer cooling demand was reduced by approximately 68% compared to the reference scenario.
The research demonstrates that SMA-driven adaptive ventilation can contribute to lower-energy building performance as part of a hybrid climate strategy. The proposed component should be considered a proof-of-concept, as further testing is needed regarding durability, airtightness, acoustic performance, draught risk and real-world façade integration.