There is an ever-growing need for clean renewable energy in modern day society. Currently, major developments are being made on Decentralised Power conversion systems that use renewable energy sources. The application of ORC radial-flow turbines in Decentralised Power conversion applications seems promising, however, application of this technology is still sparse due to the lack of knowledge of the design, resulting in an extensive duration of the design cycle. The purpose of this thesis, is to reduce the duration of the design cycle, which can lead to a faster transition towards Decentralised Power Generation to help meet the increasing energy demands.