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Session: Poster session & Sponsor Exhibition
Session starts: Monday 07 October, 14:00

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Yu-Ting Wu ()
Wei Wang ()
Ye-Qiang Zhang ()
Jing-Fu Wang ()
Chong-Fang Ma ()

Abstract:
Screw machines include single screw machine and twin screw machine. The screw compressors have been worldwide used in refrigeration, air conditioning and industrial gas compression. Twin screw machine as an expander have been developed for the application in energy conservation and renewable energy. However, the use of single screw machine as an expander is a new concept and no any prototype of single screw expander except our team is reported in the world. Single-screw expander can be used as expansion power machine in small capacity ORC power system with output power from 1 to 500 kW. It has many advantages, such as long working life, balanced loading of the main screw, high volumetric efficiency, low noise, low leakage, low vibration and simple configuration, etc. it is suited to superheated steam, saturated steam or wet steam. A single screw expander prototype with 117m Screw Diameter was developed. Compressed air and steam experiment system were built to test the performance of single screw expander. By adjusting the clearances from screw, gate rotor to shell and improving manufacture precision, the total efficiency increased from 30% of first prototype to above 60% of modified prototype. Other three types of single-screw expander prototypes, which are 155 mm screw diameter, 175 mm screw diameter and 195 mm screw diameter, have also been developed. The performances of these prototypes with rotating speed and pressure have been tested. From the results, maximum output power of each type of prototypes is 5kW, 9.9kW, 22.4kW and 51.8kW, and maximum total efficiency of each is 66%, 58.3%, 70% and 63%. An organic Rankine cycle (ORC) experimental system was also built. The preliminary experimental results were obtained. Experimental results indicate that the maximum efficiency of expander reached 80% and that of ORC reached 6%。