Performance Expectation of A Geothermal Heat Pump System Using A Numerical Model

Abstract

The aim of this study is to expect the long-term performance of a geothermal heat pump system by simulation with a numerical model and monitored data. In three ground heat exchangers (GHEs) entering and leaving fluid temperatures and GHE flow rates were monitored during a period of system operation. The monitored data were used to calculate heat transfer rates of GHEs. From the weekly and seasonal variations of heat transfer rates, we defined the characteristics of cooling and heating loads of the building. A simplified numerical model of borehole heat exchanger was applied to simulate heat transfer rate of GHEs and the validity of the model was approved by comparing with the heat exchange rates of measured data. The numerical model is used to predict long-term performance and the stability of the system.