Construction of Simulation Model and Study on Heat Exchange Rates for GeoHP Air Conditioning System Using Pile Foundation

A Case of Sannou Junior High School in Akita City

Abstract

A simulation model of GeoHP air conditioning systems using the pile foundation was constructed using a analytical modeling approach.The simulation model combined a heat storage tank of 140m³, a 60HP heat pump, 75 vertical heat exchangers with double U-tubes of 50m deep, and horizontal piping systems. Using the simulation model, the available heat exchange rates from the pile foundation in the GeoHP systems in Sannou Junior High School were studied through case studies. As a result, it is concluded that the heat exchanges from the pile foundation (143, 658kWh) can be increased by 1.6times from the present value (90, 067kWh) without significant reduction of COP.