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Solar XXI building: Proof of concept or a concept to be proved?

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  • Oliveira Panao, Marta J.N.
  • Gonçalves, Helder J.P.

Abstract

Solar XXI building is a low energy office building where passive and active solar strategies have been applied to reduce the use of energy for heating, cooling and lighting, combining also an extensive photovoltaic façade for electricity production. Solar XXI opened in 2006 and is considered a high efficient building, close to a net zero energy building (NZEB), where the difference between the energy consumed and that produced is 1/10th of the energy consumed by a Portuguese standard new office building. Its design includes many energy efficiency concepts, such as a high insulated envelope, south sun exposure, windows external shading, photovoltaic panels heat recovery, ground-cooling system, daylighting, stack effect and cross ventilation. The solar gains of the windows and the effectiveness of shading devices were evaluated in order to correlate solar radiation, external and indoor air temperatures. It was also verified that amplitude-dampening of ground-cooled air ranged between 5 and 8 °C, following the trend of the analytical solution for heat diffusion of a cylindrical air/soil heat-exchanger.

Suggested Citation

  • Oliveira Panao, Marta J.N. & Gonçalves, Helder J.P., 2011. "Solar XXI building: Proof of concept or a concept to be proved?," Renewable Energy, Elsevier, vol. 36(10), pages 2703-2710.
    • Handle: RePEc:eee:renene:v:36:y:2011:i:10:p:2703-2710
    DOI: 10.1016/j.renene.2011.03.002
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    Cited by:

    1. José Marco Lourenço & Laura Aelenei & Jorge Facão & Helder Gonçalves & Daniel Aelenei & João Murta Pina, 2021. "The Use of Key Enabling Technologies in the Nearly Zero Energy Buildings Monitoring, Control and Intelligent Management," Energies, MDPI, vol. 14(17), pages 1-21, September.
    2. Hollmuller, Pierre & Lachal, Bernard, 2014. "Air–soil heat exchangers for heating and cooling of buildings: Design guidelines, potentials and constraints, system integration and global energy balance," Applied Energy, Elsevier, vol. 119(C), pages 476-487.
    3. Savvides, Andreas & Vassiliades, Constantinos & Michael, Aimilios & Kalogirou, Soteris, 2019. "Siting and building-massing considerations for the urban integration of active solar energy systems," Renewable Energy, Elsevier, vol. 135(C), pages 963-974.

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