IEBWUMS

 

Dynamic energetic evaluation of heat pump and micro CHP systems: Focus on heat pump systems

   

Duration: 3 Years

Start: 07/2014

End: 07/2017

Project partners:

• Technische Universität Dresden, Institut für Energietechnik, Professur für Gebäudeenergietechnik und Wärmeversorgung
• Universität Stuttgart, Institut für Gebäudeenergetik

Sponsors: BMWi – Federal Ministry for Economic Affairs and Energy, promotional reference 03ET1211B

   

Test procedures for heat pumps (HP) usually consider static boundary conditions. The energy efficiency is analyzed at single operating points. The results differ strongly from those measured in field tests.

In reality, heat pumps operate under various operating conditions and their efficiency depends on the system layout, the dimensioning of all components and the system control strategy as well as the unit’s controllability.

Together with our project partners at Dresden University of Technology and University of Stuttgart, the Institute for Energy Efficient Buildings and Indoor Climate (EBC) develops new dynamic evaluation methods for heat pump systems. As a main part of the project Hardware-in-the-Loop (HiL) test benches that allow testing of heat pump systems and small combined heat and power (micro CHP) units are built.

The tested hardware is coupled to a real time simulation via the test bench. At EBC the test bench consists of a climatic chamber which emulates the ambient conditions and a hydraulic assembly which emulates the hydraulic cycle of a heating system. The simulation calculates a building’s heat demand that is going to be the input value for the hydraulic part of the test bench.

The goal of the project is to develop a unified test procedure that is capable of evaluating the seasonal performance of heat generators during a small number of test days. Therefore, a certain number of days with representative weather data must be identified. These ambient conditions can be created in the climatic chamber and the building’s heat demand can be calculated in the simulation model.

Finally, the tested hardware is going to be exchanged between the project partners aiming to evaluate the reproducibility of the test procedure.

We appreciate the good cooperation with our project partners Dresden University of Technology (Institute of Power Engineering, Professorship of Building Energy Systems and Heat Supply) and University of Stuttgart (Institute of Building Energetics). And we gratefully acknowledge the financial support by the Federal Ministry for Economic Affairs and Energy (BMWi), promotional reference 03ET1211B.