30 May 2005

COMPARING NEW CONTROL CONCEPTS FOR HEAT PUMP HEATING SYSTEMS ON A TEST BENCH WITH THE CAPABILITY OF HOUSE AND EARTH PROBE EMULATION


A test bench for dynamical tests on a brine-to-water heat pump is presented. The test bench at the
Measurement and Control Laboratory of ETH allows the comparison of heat pump control concepts under
real conditions. The thermal behaviors of a fictitious house as well as of a fictitious earth probe are
emulated for a real heat pump installed at the test bench. The weather is also emulated using synthetic
weather data. Since these conditions are reproducible, the controllers can be compared among each other
equitably under the same conditions. A new control concept for heat pumps is also introduced, which
makes use of weather forecast data to optimize the heat distribution during the day. The results of the
comparison between a conventional relay-type controller and the new model predictive controller show
that with the new controller concept the heating costs are reduced by 10%.