Heat Exchanger Pile System of the Dock Midfield at the Zürich Airport. Detailed Simulation and Optimisation of the Installation

Pahud, Daniel and Fromentin, Antoine and Hubbuch, Markus (1999) Heat Exchanger Pile System of the Dock Midfield at the Zürich Airport. Detailed Simulation and Optimisation of the Installation. Project Report. UNSPECIFIED.

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Abstract

The Dock Midfield, a new terminal of 500 m long at Zürich airport, will be constructed on 350 foundation piles. About 300 will be used as heat exchanger piles for heating and cooling purposes. The piles are thick, up to a diameter of 1.5 m, which is unusual for heat exchanger piles. Validated TRNSYS simulation tools are used and adapted for the thermal simulation of the Dock Midfield pile system. The heat exchanger pile system has to be sized and optimised in a proper way, and requires a precise knowledge of the input data. A response test has been carried out to determine in situ the thermal conductivity of the ground and measure the average ground temperature. The results confirm that no significant ground water movement is present. A detailed simulation of the pile system reproduces as best as possible the system layout. This latter is improved and an optimal system control is found on the basis of simulation results. The system thermal performances simulated with PILESIM correspond to those obtained with the detailed model. PILESIM is a simulation tool for heating and cooling systems which use heat exchanger piles or multiple borehole heat exchangers. PILESIM has been developed in the framework of this study. It can be used by people who are not necessarily experts in system simulation and TRNSYS. A great flexibility has been preserved in order to be able to simulate a large variety of system concepts. The required time to define and simulate a system is reasonably short, which is a great advantage for the assessment of an early project and different system concepts.

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