Solar and heat pump systems promise a significant efficiency improvement for heating systems. In this context three different system concepts are compared within TRNSYS simulations for solar heat pump systems with borehole heat exchangers and flat plate collectors. The concepts are examined with solar heat injection either to the hot side for domestic hot water preparation, to the cold side of the heat pump for thermal borehole support or in terms of a combination of both, hot and cold side injection. Connected to the hot side of the heat pump, the increase of the seasonal performance factor is 1.2. If connected to the cold side, the impact is typically below 0.2, but it significantly depends on the specific heat exchanger length and the collector area.
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