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Combining heat pumps with combistores: Detailed measurements reveal demand for optimization

A heating system that combines a ground source heat pump and solar collectors with a combistore was measured in detail in the laboratory by means of "whole system testing". The test rig thereby emulated a building with floor heating, hot water tappings, flat plate solar thermal collectors and a ground source heat exchanger. The tested heating system covered the heat demand for space heating and domestic hot water preparation in a reliable way with a good annual system performance factor of 4.5 that was determined after the physical test by means of test-calibrated simulation models.

A heating system that combines a ground source heat pump and solar collectors with a combistore was measured in detail in the laboratory by means of "whole system testing". The test rig thereby emulated a building with floor heating, hot water tappings, flat plate solar thermal collectors and a ground source heat exchanger. The tested heating system covered the heat demand for space heating and domestic hot water preparation in a reliable way with a good annual system performance factor of 4.5 that was determined after the physical test by means of test-calibrated simulation models. Nevertheless the measurements revealed that there is still room for improvements. It was found that the heat pump operates in space heating mode in an oscillating on/off behavior with short runtimes and respectively with a high number of starts and in addition with a supply temperature that is in average 8 K above the temperature that is needed in the heat distribution. Furthermore a significant transport of energy, from the upper part of the store that is reserved for domestic hot water preparation to the lower part, reserved for space heating, was detected.

SHC2013 - Energy Procedia, 48, p.361–369, ScienceDirect-Link

Autorenschaft:
Robert Haberl, Dr. Michel Haller, Andreas Reber, E. Frank, 2013
Zeitschrift / Sammelband:
<<Energy Procedia>>Volume 48
Ort / Verlag:
SHC 2013, International Conference on Solar Heating and Cooling for Buildings and Industry
Seiten / Kapitel:
361 – 369
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