This study presents a beta type Stirling engine mechanism and its performance analysis. The displacer
motion of the engine is performed by a lever mechanism. The performance of the engine was investigated
via comparing with a rhombic-drive engine possessing an equal sided rhombic. Comparison was made for
kinematic behaviors, power and thermal efficiency. For comparison; the piston swept volume, the inner
heat transfer area, the hot and cold end temperatures, the inner heat transfer coefficient, charge pressure
and dead volumes were kept equal for both engines. As working fluid the helium was used. Thermodynamic
treatments of engines were performed via the nodal analysis. The power of the lever driven engine
was found to be greater than the power of the rhombic drive engine. Under the equal charge pressure, the
thermal efficiency of the lever driven engine was found to be lower than the efficiency of the rhombic
drive engine however, under the equal working fluid mass the thermal efficiency of the lever driven
engine was found to be greater than that of the rhombic drive engine. The external volume and mass
of the lever driven engine is lower than the rhombic drive engine.
2013