Solar XXI building in LNEG

Three Office Buildings Using Passive Heating and Cooling Design - July 2015

The Solar XXI building in LNEG is one of the three examples of new buildings where such techniques have been employed

This building is a combined office and laboratory at the National Energy and Geology Laboratory (LNEG). This 1500m2 (16,146ft2) multipurpose building in Lisbon, Portugal, is naturally ventilated and functions as a near zero energy building. Its cost is said to be little more than a conventional building of the same size.

Solar XXI building in LNEG

Plan and sectional view of the Solar XXI building in Lisbon, Portugal, showing distribution of the buried air pre-cooling system


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