Measured thermal performances of the Dock Midfield energy pile system at Zürich airport

Pahud, Daniel and Hubbuch, Markus (2006) Measured thermal performances of the Dock Midfield energy pile system at Zürich airport. In: Energie- und Umweltforschung im Bauwesen Schweizerisches Status-Seminar 2006, 7-8 September 2006, ETH, Zurich.

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The Dock Midfield is the new terminal E of the Zürich airport. As the upper ground layer is too soft to support the loads of the building, 440 foundation piles have been built. More than 300 piles have been converted into energy piles in order to contribute to the heating and cooling of the building. Measurements of the energy pile system begun in October 2004 for a 2 years period. The results of the first year are presented. The measured system heat balance, and in particular the annual heating and cooling demands are close to the design values. Furthermore the thermal performances of the system are very good. It confirms the necessity and the suitability of a detailed and careful design process for this type of system. The design procedure has been based on detailed studies, involving response test analysis, thermal dynamic simulations of the building and the energy pile system. The pile heat balance indicates that 39% of the annual extracted energy is injected by geocooling. This ratio is compatible and conform to the system design predictions. An improving potential lies in the cooling distribution. It could increase the global annual system efficiency from 4.9 to 5.4.

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