Hochschule Bremen - University of Applied Sciences

Hochschule Bremen

Theoretical and Practical Investigation of µORC Installation with Scroll Expander

Beitrag auf Tagung

Natur und Technik

Julius Robert Mayer - Institut für Energietechnik

Smolen, Slawomir, Prof. Dr.-Ing.
Eicke, Albrecht, Dipl.-Ing.


Name(n), Titel
Smolen S., Eicke, A.
International Symposium – Research - Education - Technology

Weitere Informationen zur Veranstaltung
Proceedings, October 2017
Edited by. H. Meironke, J. Kropiwnicki, S. Smolen
ISBN: 978-3-9817740-2-3

Hochschule Stralsund

12.-13. Oktober 2017

An innovative Micro-Organic-Cycle-Installation has been developed and designed in the Laboratory for Energetics of the University of Applied Sciences in Bremen. This new device has the specific capability to be connected to an alternative power source and is transportable for use at conferences and trade fairs. The design incorporates a scroll engine as the expansion device, which requires no lubrication and is relatively small.
The installation can be coupled to solar collectors providing the heat at the temperature level of 130 °C. Alternatively as current solution of the test bench, the heat can be generated by an electric driven thermal heater rated at a nominal power of 20 kW to demonstrate the functionality of the ORC itself without using solar energy. Disregarding the source of the heat, it is transmitted by two plate heat exchangers to the working fluid (R245fa). The operating pressure of 1,38 MPa is maintained by a sliding vane pump. The fluid can be completely evaporated and superheated to the maximal temperature of 115 ° C. Subsequently, the refrigerant vapor enters the core of the plant - the scroll expander. The fluid is expanding with a pressure ratio of 3,5. After expansion the refrigerant vapor is desuperheated and fully condensed in the condenser. Between the storage vessel and the feed pump is built in a subcooler to avoid cavitation in the positive displacement feed pump. The generator is loaded with a series of controlled shiftable halogen lamps, each of about 100 W electric power. Voltage and current are measured to calculate the electrical power.
The measurements, operational control and partly regulation are carried out by the means of LabVIEW-Software connecting data sources and evaluating the thermodynamic cycle online.



Access Keys: