Experimental and Numerical Characterization of an Oil-Free Scroll Expander

The scroll characterization was carried out using both experimental and numerical tests. Six different rotational velocities in the range of (400 - 2400) rpm with a fixed pressure level (7.5 bar) were tested for validating the numerical model using air as a working fluid. The numerical model was then used to calculate the scroll expander performance operating in an existing ORC system with R134a as working fluid.