[en] In the present article, a model of scroll expander will be introduced. This model is able to evaluate the performance of a given machine with influence of the geometry. Several losses are also included by the model such as internal leakages, heat transfers or mechanical losses. The forces generated by the gas pressure on the involutes can also be calculated.
That expander model is used in order to demonstrate its potential and provide some guidelines to the design of a new expander suitable for the application.