22 May 2008

MODEL CALIBRATION FOR COMPARISON OF DIFFERENT CONFIGURATIONS OF GROUND SOURCE HEAT PUMP SYSTEMS


This paper describes part of a research project which aims to optimize heat pump systems with a borehole heat exchanger in terms of energy consumption. The research is
dealing with different configurations and control strategy. In regard to a great number of different system configurations, only four basic of them were selected. The paper presents model calibration of a heat pump system on a real ground source heat pump at CTU in Prague used for heating of a part of laboratory. System consists of one 100 m deep borehole, 9 kW heat pump, storage tank and involved control. Model is compiled in simulation environment TRNSYS. Results of simulation are obtained for a simplified building. Weather data are used from databases of Meteonorm for two different outdoor regional temperatures in the Czech Republic. The calibrated model and three other basic configurations based on it are used to simulate several operating strategies. Factor HSPF is used for comparison of energy consumption. According to the simulation results, a heat pump with the same performance characteristics can save up to 29 % of energy due to optimized configuration and control.