24 June 2014

THERMODYNAMIC ANALYSIS OF GROUND COUPLED HEAT PUMPS WITH SOLAR THERMAL REGENERATION – MONITORING AND SIMULATION RESULTS


Combined solar and heat pump systems exist since some years in a large variety on the market. There exist so-called parallel and serial configurations. Ground coupled heat
pumps work parallel sometimes with regeneration of the ground source using solar thermal. Such solar and heat pump systems have the potential of performing very efficiently
compared to standard heat pump systems. However, the technical effort and thus the investment costs increase significantly. In addition, the installation and operation are more
likely to be subject to errors and failures. In order to optimize control strategies and to evaluate the benefit of these systems simulations have to be performed. Eventually, the
costs per saved kWh have to be competitive. Monitoring data and system simulation results are presented and a thermodynamic analysis of regeneration of the ground is conducted for different types and designs of ground heat exchangers by means of simulation with Matlab/Simulink. For such an investigation, detailed models of the ground heat exchanger that are validated against measured data are
presented. Results of system simulations with different ground heat exchangers are compared.