Abstract
This paper describes field performance of air conditioning with an energy pile system, which was applied to pile foundations of an actual building, for the purpose of the cost reduction of an underground heat exchanger. Firstly, the building for both office and residential use, for which a space heating and cooling system using friction piles was installed, was built in Sapporo in December, 2000. Secondly, three tests were carried out in order to specify the design of a heat exchanger inside the pile, and U-tube type underground heat exchanger was adopted from the viewpoint of energy efficiency and installation cost. As a result of long term measuring on space heating operation, the seasonal average temperatures of brine's return from the underground and pile surface were 2.4℃ and 6.7℃, respectively. The average coefficient of performance was quite high ; 3.9 and the primary energy reduction rate relative to a typical air conditioning system reached 23.2%.
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