P&D Renosource – Multi-source heat pump system for the boiler replacement with ground probes for peak load coverage

Carsten Wemhoener Head of IET Building System Technology Department and Professor

Abstract
The project investigates a boiler replacement in two multi-family dwellings, where the oil boilers are replaced by indoor installed propane heat pumps with the two heat sources air and a peak load coverage by borehole heat exchangers. By designing the ground source for peak coverage, existing space and drilling depth constraints are overcome and the heat pump is operated without fossil fuel peak coverage. This is also supported by the high possible flow temperatures of 70 °C of the propane heat pumps. The monitoring of the heat pumps over three heating periods therefore serves not only for operational evaluation and optimization, but also for the verification of simulation models, which are used to develop advanced design and planning recommendations for these multi-source systems. Furthermore, an evaluation of indoor propane heat pumps with regard to efficiency and economy will be performed. The goal is to document a best practice system for multi-source applications and indoor installed propane heat pumps.

Authors: Wemhöner, Carsten; Meier, Christoph.

Note: This result was developed outside of the Renowave project.