Group Project Responsible for the geometry calculations, and thermodynamic and dynamic analysis in Matlab. Responsible for the design of the scroll expander in Solidworks.
Goal
The designing (geometry and dimensions, thermodynamic characteristics, imbalancing, overcharges and efficiency) of a scroll expander so that exploits the gas heat energy that is expelled by an Organic Rankine Cycle (ORC) system and produces mechanic work thus generating electricity.
ORC system specifications
System power: 1.5kW
Rotation speed: 3000 rpm
Fluid: nitrogen
Input / output pressure: 11bar / 1.5bar
Inlet temperature: 130 oC
Process
Calculation of the volumes of each combustion chamber of the two cooperating scrolls, provided the desirable specifications. The chart shows the relationship between the volume (m3) of the compressed air in the chamber and the angle of the shaft (degrees)
Calculation of thermodynamic properties using mass, forces and energy equilibrium as well as kinematic and dynamic analysis, given the calculated volumes. The chart shows the relationship between the pressure (bar) of the compressed air in the chamber and the angle of the shaft (degrees)
Calculation of dimensions for the given thermodynamic properties.
Modeling of the systems and simulation in Simulink in order to analyse its behavior.
Optimization of the properties and dimensions, based on the resulted power and volumetric efficiency that the dimensions of each loop provided.
Results
The resulted specifications of the scroll expander we designed was: