22 May 2008

FIELD TESTS OF HEAT EXTRACTION OR INJECTION USING FOUNDATION PILES AS GROUND HEAT EXCHANGERS APPLYING LOW FLOW CIRCULATION


Field experiment of heat extraction or injection with foundation piles as ground
heat exchangers applying low flow circulation has been carried out since October 2006 in
order to develop the low flow ground heat exchanger. The ground heat exchanger can
extract or inject nearly equal heat to the conventional ground heat exchanger even in a case
where the low flow circulation system is adopted in the primary side. As the results of
experiment, it was confirmed that several types of ground heat exchangers with flow rate of
8L/min extracted nearly equal heat to the conventional one with flow rate of 16L/min. The
authors also conducted the experiment using foundation piles with the different specification.
Additionally, temperature variation calculated by a simulation program is validated by
comparing to the measured one.