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ORC-Demonstration Plant with 1 kW Scroll Expander


Veröffentlichungsart
Beitrag auf Tagung

Fakultät/Einrichtung
Natur und Technik

Institutszugehörigkeit
Julius Robert Mayer - Institut für Energietechnik
Hochschule Bremen
Neustadtswall 30
28199 Bremen
http://www.hs-bremen.de/internet/de/forschung/einrichtungen/jrmi/therm/

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

Jahrgang
2015

Name(n), Titel
ORC-Demonstration Plant with 1 kW Scroll Expander

Weitere Informationen zur Veranstaltung
XXII International Symposium - Research - Education - Technology

4. Internationale Konferenz - Niedertemperatur- und Abwärmenutzung in Kommunalen und Industriellen Energieversorgungssystemen

Veranstaltungsort
Hochschule Bremen
Neustadtswall 30
28199 Bremen

Datum
24. - 25- September 2015

Anmerkung
http://www.hs-bremen.de/internet/de/forschung/einrichtungen/jrmi/intercon/


Ansicht der ORC-Anlage mit scroll expander
µORC-Power plant
Abstract
In this paper the current project – an ORC demonstration and test plant with an oil free expander - will be presented. The core of the micro power plant is a scroll-expander with a nominal power of 1 kW.
A commercially available scroll expander (Air Squared Inc., E15H22N4.25) with generator was used as expansion machine of the plant, in order to check the capabilities and the theoretical and practical limitations. In the first testing phase, compressed air has been used as working fluid in the expansion machine and the characteristic curves (electric power versus revolution speed with overall efficiency) have been plotted. These results can be extrapolated on other working fluids theoretically and are an indicator for the limitations of the scroll expander coupled with the electric generator. In the main phase of the project, the complete ORC-Installation with R245fa as working fluid is going to be tested and evaluated.
Within the framework of many projects and activities in the JRM-Institute and Laboratory for Energy Engineering at the University of Applied Sciences in Bremen, several practical and theoretical aspects of energy transformation using Organic Rankine Cycle have been investigated.
One of the practical limitations and challenges of developing of new ORC-installations are expansion devices, or lack of suitable machines for special applications in small and middle range of performance (especially micro- and mini ORC-installations). There are many approaches and practical solutions and technologies like using micro turbines, scroll expanders, screw machines, special reciprocation engines and others. The internal efficiency of expansion process is one of the biggest sources of energy and exergy losses which restrict system’s efficiency. As example of practical possibilities and solutions, the application of a screw compressor as expansion device of ca. 30 kW has been investigated and the unique installation has been put into operation within a prior theoretical and practical work. The project work presented in this paper deals with smaller range of performance and uses existing components in order to extend the practical and theoretical experiences and potential applicability.

The general goal of the work was concept development, design, evaluation and optimization of an ORC plant in power range of ca. 1 kW. One of the practical intensions of the project was to investigate a commercially available scroll expander (Air Squared Inc., E15H22N4.25) with generator as core piece of the plant, to adopt the installation to this specific expansion device and to check the capabilities and the theoretical and practical limitations.
In the first stage of development, the heat source should be “simulated” by an electric heater but, as final solution, the test plant will be coupled with a solar installation in order to demonstrate the application as renewable energy conversion and use.


4. Internationale Konferenz LTHU
4. Internationale Konferenz - Niedertemperatur- und Abwärmenutzung in Kommunalen und Industriellen Energieversorgungssystemen
 

 

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