Current efforts to improve building envelopes mostly focus on reducing energy demand by static measures such as insulation, selective glazing and shading. The resulting envelopes are limited in adapting to weather conditions or occupants’ needs and leave vast potentials for energy savings, onsite energy generation and improvement of occupant comfort untapped. In this work, we report on a dynamic building envelope that utilizes lightweight modules based on a hybrid hard/soft-material actuator to actively modulate solar radiation for local energy generation, passive heating, shading and daylight penetration. We describe two envelope prototypes and demonstrate autonomous solar tracking in real weather conditions. The dynamic photovoltaic envelope achieves an increase of up to 50% in electricity gains as compared to a static photovoltaic envelope. We assess energy savings potentials for three locations, six construction periods and two building use types. The envelope is most effective in temperate and arid climates, in which, for the cases analyzed, it can provide up to 115% of the net energy demand of an office room.
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The data that support the plots within this paper are partly available on a public repository (https://github.com/architecture-building-systems/CityEnergyAnalyst)51 or from the corresponding author upon reasonable request.
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We thank G. Lydon from the Architecture and Building Systems Group, ETH Zurich, for helpful suggestions. We thank M. Niffeler from the Architecture and Building Systems Group, ETH Zurich, for assistance with FEA. We acknowledge support from the Building Technologies Accelerator programme of Climate-KIC. We acknowledge Flisom AG for provision of high-efficiency CIGS PV modules.
B.S., M.B., P.J., S.C. and A.S. are inventors on an international patent application (PCT/EP2018/080425) submitted by ETH Zurich that covers the actuator, the manufacturing method, the pneumatic control system and the envelope. The remaining authors declare no competing interests.
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Supplementary Figs. 1–10, Notes 1–3, Table 1 and refs.
The video shows the operation of the soft-robotic-driven dynamic building envelope with 30 elements. The envelope cycles through different states, such as open, close, towards east and towards west. Parallel and sequential control of envelope rows is also presented, demonstrating the possibility to generate different transition patterns. The envelope is mounted at the NEST building at the Swiss Federal Laboratories for Materials Science and Technology, in Dübendorf, Switzerland.
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Svetozarevic, B., Begle, M., Jayathissa, P. et al. Dynamic photovoltaic building envelopes for adaptive energy and comfort management. Nat Energy 4, 671–682 (2019). https://doi.org/10.1038/s41560-019-0424-0
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