Development of an exergy-based valuation method for community supply systems

Anna Kallert
Fraunhofer-Institute for Building Physics

Branch Kassel, Department Energy Systems, Group LowExergy Systems
Phone: +49 561 / 804 1876 –

Prof. Dr.-Ing. Gerd Hauser
Technical University of Munich, Department of Civil Engineering and Surveying, Institute of Building Physics

2. Supervisor
Professor Folke Björk
KTH – Royal Institute of Technology, Department of Civil and Architectural Engineering, Division of Building Technology, Stockholm Sweden

Short discription of the subject

Background and motivation
The energy turnaround requires innovative, sustainable, renewable and efficient approaches for the provision of thermal energy for heating and cooling of community building systems. Within community supply systems, interactions occur caused by varying of energy demand of different building types (net reactive buildings). In terms of its performance (quantitative “energetic” and qualitative “exergetic”) the evaluation of several building types in a district or municipal building systems is only insufficiently possible. Furthermore, there are no approaches that consider both the generation and the demand side. For this reason, it is striven to develop a method based on thermodynamic principles – especially the “LowEx” approach- for dynamic evaluation of community building systems.
In the context of an exergetic, dynamic just simplified assessment method but also simulation models for single buildings already exist. These models and methods have been developed as part of the national "collaborative project LowEx" and "LowEx Monitor" and the international "ECBCS Annex 49". But by usage of these models and assessment methods it is not possible to review and assess the interactions of buildings within a community supply system. As a result it is a challenge to map all these interactions – from generation and demand side – to make a review of all parameters.

Based on existing approaches a method of exergetic assessment of community supply systems should be developed gradually. By usage of selected system configurations a dynamic analysis of the exergy flows has to be realised. As part of the analyses interactions of the buildings as part of the community system with each other has to be taken into account.

For the implementation, the following scientific methods can be used:
Through an analysis of data from projects funded by the Federal Ministry of Economics and Technology (BMWi) it is possible to validate the approaches of the method.

Expected results

Short CV

Since 10.2012Research associate and PhD Student as part of the Fraunhofer Gesellschaft e. V. -doctoral program
11.2011 - 05.2012Diploma thesis II (Siemens AG, Energy Sector, Mülheim a.d. Ruhr):
„Modeling of evaporation cooling at air inlet of stationary gas turbines“ 
10.2010 - 05.2012Mechanical Engineering studies II, Specialization „Thermal Engineering“
04.2010 - 10.2010Diploma thesis I (Fraunhofer Institute for Building Physics, Kassel):
„Summer heat protection: Comparative analysis of methods for assessment of heat insulation of buildings under summer conditions“
08.2007 - 11.2011Research assistant at Fraunhofer Institute for Building Physics, Kassel Branch, Department Energy Systems
08.2007 - 02.2008Internship: Fraunhofer Institute for Building Physics, Kassel Branch, Department Energy Systems
02.2007 - 09.2007Assistant at ABS Guss GmbH, Kassel, casting industry
10.2006 - 10.2010Research Assistant at the University of Kassel: educational activities
10.2004 - 09.2010Mechanical Engineering studies I, Orientation: Life Cycle Engineering (LCE) and Assessment (LCA), sustainable process optimization

Focus of interests and research


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