Bachelor's thesis Robin Kurth


Implementation of an single room heating control for heatpumps

Overview looked at system Copyright: EBC Overview for the looked at system

Recently enforced laws such as the „Energieeinsparverordnung“ (EnEV) yield the need for the affected
groups to fulfill the tightened conditions in terms of the housing-complex and the reduction
in the consumption of primary energies. In this situation the heatpump shall take its place as a
key-technology towards more efficient heating. The heatpump uses renewable heat from its surrounding,
which is then elevated to useful heating temperatures through the adding of energy.
The technology of heatpumps harbors, in comparison to commonly used heating systems like
boilers, great potentials to reduce the energy consumption. These potentials could not be used
till now due to insufficient control strategies as well as uneconomical aquisition costs and operating
modes, which causes many heatpumps to lag behind to the expected COPs. The community
study “MOSKWA” tracked parts of these potentials down to single room controls and an additional
flow-temperatur control. The resulting reduction of energy adds up to an improvement of
11% compared to an ideal uneconomical user. Moreover exists a variety of papers about the same
topic, which point into a similiar direction, but to this day were only implemented in simulations.
If the predicted potentials exist and of what quantity they are in the end, is necessary to validate
in actual experiments without further idealisation.
In this thesis a higher control concept for a central flow-temperature control is developed based
on the given predictions of MOSKWA. Furthermore it will be tested in a Hardware-the-Loop test
bench. The needed interfaces will be developed and implemented. The overall system contains a
reduced room in a simulated house-environment, which shall be extendalble for as many rooms
as needed. Furthermore the System contains the controller as well as a coupled heatpump. For
the communication of these components through the interfaces a stable connection will be established.
In the given thesis a MQTT-protocol shall be used for this task. Likewise will the funcionality
of the controller and stable parameters for its operation be determined. Moreover will
the parameters of the controller be optimized in regard of its build-up time and other commonly
applied characteristics. Lastly two reference scenarios and one simple time-temperature-profile
shall be established.
By implementing a correct working communication structur between the different components
of the system and an application of the Control concept at the test bench parts of the predicted
potentials und new problems reveal itself and show the need of further experiments in this field.