Measured Thermal Performances of the Energy Pile System of the Dock Midfield at Zürich Airport

Pahud, Daniel and Hubbuch, Markus (2007) Measured Thermal Performances of the Energy Pile System of the Dock Midfield at Zürich Airport. In: European Geothermal Congress European Geothermal Congress 2007, 30 may, 1 June 2007, Unterhaching, Germany.

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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 measurement campaign 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. The global system efficiency is over 5. 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. Thanks to the detailed measurements of the system, the elaboration of PILESIM2, version 2 of PILESIM, has been realised. The geocooling mode is better taken into account in the calculation. The comparison of the calculations with measurements is very satisfactory. PILESIM2 calculations show that if cooling energy could be delivered at 16 – 17°C, the cooling machine would not need to be used. The global system efficiency would increase from 5.1 to 5.7. From an economical point of view, the pile system is more convenient than a conventional system. The additional investment of the pile system is paid back in about 8 years.

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