Hello, maybe you start looking at producers of ORC Cycle systems, like Turboden in Italy, Carrier, GEN
and look what they use, there are many. I have heared of some scroll expanders for ORC cycles some years ago,
could find not much in my library though. See the literature index of http://www.plastverarbeiter.de/ai/re...ddb4ff7835.pdf. This article in german is about screw expanders used in big size refrigeration systems instead of solenoid valves. Scroll expanders and screw expanders need anyway a cycle oriented construction or they have a poor output. You can browse the website of http://www.bios-bioenergy.at/en/ too, they have ... or had nice information. In germany we had to switch to Kalina Cycles, as Organic Refrigerants are unwanted nowadays. Those are Ammonia Water binary cycles. They can use common water/steam expansion machines which makes them less expensive.