Verena Zipf

Verena Zipf Fraunhofer Institute for Solar Energy Division Solarthermal and Optics Heidenhofstraße 2 79110 Freiburg Tel: +49 (0)761 4588 5978 Fax: +49 (0)761 4588 9900 Mail: Verena.Zipf@ise.fraunhofer.de Homepage: www.ise.fraunhofer.de

Curriculum Vitae

Born in Germany, Heilbronn,1984

Studies:
Germany, Karlsruhe Institute of Technology (KIT), Mechanical Engineering – Energy and Environmental Technology

Practical and scientific experience

Jan. 2012 – today Fraunhofer Institute for Solar Energy
PhD Position: Development of a latent heat storage for direct steam generation and industrial processes
May 2011 – Dec. 2011 Fraunhofer Institute for Solar Energy
Scientific assistant: Planning of heat storage lab prototype
Sept 2010 – Apr. 2011 Fraunhofer Institute for Solar Energy
Diploma thesis: Conceptual design of an innovative latent heat storage
May 2009 – Sept. 2009 Institut de Radioprotection et de Sûreté Nucléaire ( IRSN )
Internship: Modelling of the effects of an incident in the fucion reactor ITER
 

Voluntary and social activities

Oct. 2010 – Aug. 2011 University Group forUN
Oct. 2009 – June 2010 Member in the organization team of tourEUCOR 2010

Publications

Verena Zipf, Anton Neuhäuser, Daniel Willert, Peter Nitz, Stefan Gschwander, Werner Platzer: „HIGH TEMPERATURE LATENT HEAT STORAGE WITH A SCREW HEAT EXCHANGER: DESIGN OF PROTOTYPE”. Applied energy, 2012.

Verena Zipf, Anton Neuhäuser, Daniel Willert, Peter Nitz, Stefan Gschwander, Werner Platzer: “Development of a High Temperature PCM Storage for DSG: Storage Prototype with thermal oil “. SolarPaces - Concentrating solar power and chemical energy systems, Marrakesh, 2012.

Verena Zipf, Anton Neuhäuser, Peter Nitz, Stefan Gschwander, Werner Platzer: „HIGH TEMPERATURE LATENT HEAT STORAGE FOR CSP: TESTING OF PROTOTYPE WITH THERMAL OIL“. Innostock - The 12th international conference on energy storage, Lleida, 2012. (Oral presentation and conference paper)

Werner J. Platzer, Anton Neuhäuser, Verena Zipf, Stefan Gschwander, Peter Nitz: A new approach for high temperature latent heat storage for CSP”, 6. Internationale Konferenz und Ausstellung zur Speicherung Erneuerbarer Energien IRES , Berlin, 28.-30.11.2011

Verena Zipf, Anton Neuhaeuser, Peter Nitz, Stefan Gschwander, Werner Platzer: INNOLAT-CSP: Development of an innovative latent heat storage for concentrating solar thermal power systems.E.ON International Research Initiative Conference EIRI, Birmingham, 5. - 6. Juli 2011

Abstract of thesis

Development of a latent heat storage to increase the efficiency, dispatchability and profitability of solar energy production

To increase the proportion of solar energy production, direct steam generating power plants with thermal storages are an important technology to produce energy which can deliver base load or load dependent electricity. Moreover, the decentralized production of combined heat and power (CHP) with solarthermal collectors in small/middle scale power is investigated at the Fraunhofer ISE. Due to relatively small total investment needs, the distribution of CHP facilities is fairly easy. However, the specific investment is relatively high. Therefore the efficiency of these facilities has to be increased to make them profitable. With a thermal storage the occupancy rate can be increased to after the sunshine hours, resulting in a better profitability of CHP facilities. Moreover, with a thermal storage the dispatchability of heat and power is improved. The development of a suitable storage technology is imperative.
Latent heat storages are exergetically optimal suited for the storage of the energy in two phase working fluids (e.g. steam). Up to now, there is no technical implementation of latent heat storages in this field of application due to technical challenges (e.g. very low heat conductivity of phase change materials (PCM)). The innovative two tank storage concept, which will be developed during this work, consists of a granules and a molten material storage tank. The phase change occurs during the transport of the PCM from one storage tank to the other inside a screw heat exchanger (SHE). SHE are transport machines with hollow shafts and screw flights. Inside, a heat transfer media is used for heat transfer. The SHE for the storage is (dis)charged with steam/water. The phase change takes places during the transport of the PCM. Therefore a small heat exchanger area, high loading/unloading speeds and high storage capacity are present at the same time (in contrary to existing latent heat storage concepts). The three years’ work includes the development, built up and survey of two prototypes of the storage. With the measurement results, a simulation model of the storage will be built and thereafter validated.