Abstract
This article describes the results of a project whose task is to research and develop a screw expander through the inversion of a screw compressor. The article summarizes aspects of the construction of an experimental device that works with an oil-flooded air screw expander. The expander was subjected to experimental and numerical analysis, the results of which are presented in the article. Numerical analysis to examine the expansion process is performed both on the basis of the analytical geometric description of the working chamber of the expander and on the basis of the geometry obtained from a 3D scan of a real machine. The results of experimental and numerical analysis will be used to integrate an oil-flooded screw expander into an energy unit for the use of low-potential heat, for example in ORC systems.
Highlights
Numerical analysis to examine the expansion process is performed both on the basis of the analytical geometric description of the working chamber of the expander and on the basis of the geometry obtained from a 3D scan of a real machine
A screw expander is based on the inversion of a screw compressor and under certain conditions may be a suitable alternative to a turbine as a thermal cycle expansion device for the transformation of thermal energy into mechanical energy
The joint implementation of the project by the University of West Bohemia, OTH AmbergWeiden and ATMOS resulted in an initial analysis of the expansion process inside an oilflooded air screw expander
Summary
A screw expander is based on the inversion of a screw compressor and under certain conditions may be a suitable alternative to a turbine as a thermal cycle expansion device for the transformation of thermal energy into mechanical energy These conditions are basically defined by the parameters of the heat source. The classical steam Rankine cycle is not suitable for the use of low-potential heat, and working substances with a lower boiling point than water are usually used If such a working substance is used, a screw expander is usually an integral part of the Organic Rankine Cycle (ORC), the binary cycle or the Kalina cycle. In the case of low-potential heat applications, a liquid phase may appear during the expansion of the low-boiling working fluid, causing erosion of the turbine blades In such a case, a screw expander capable of working without damage should be used, even with a relatively large proportion of liquid phase. The mathematical model can be used to modify the profiles of screw bodies to optimize the expansion process
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