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Session: Poster session
Session starts: Tuesday 13 October, 13:30

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Ruiping Zhi (Beijing University of Technology)
Yuting Wu (Beijing University of Technology)
Yeqiang Zhang (Beijing University of Technology)
Biao Lei (Beijing University of Technology)
Wei Wang (Beijing University of Technology)
Guoqiang Li (Beijing University of Technology)
Chongfang Ma (Beijing Unversity of Technology)

Abstract:
Energy saving is a global problem we commonly face. And ORC(Organic Rankine Cycle) system offers great opportunites. ORC system can capture waste heat from internal combustion engines and industry process discarding heat at low and moderate temperatures, and then converts it to high quality energy(green electricity). And single screw expander as a key component is gaining ever increasing interest in this relative fields due to its unique advantages, including its own rated power(1-200 kW), simple structure, balanced loads, low noise and long service life, etc. Many experiments have been carried out on the performance of single screw expanders in ORC system. W. Wang did some experimental study of single screw expander prototype and stated that the output power has a maximum point with increase of rotational speed. W. He carried out expriements on the performance of the single screw expanders with compressed air as working fluid under different intake pressures and showed that the measured torque has a large increase as the intake pressure increases and has a slight decreases as the rotational speed increases. It is known that the torque of single screw expanders is an important factor that we are more concered about in its design and application. However there are no papers to study the theoretical torque of single screw expander under variable conditions. In this paper, we establish the mathematical model of theoretical torque about single screw expanders, and then develop the MATLAB programming code to get the theoretical results under different conditons such as different diameter of main rotor, different intake pressure and different tooth width of gate rotor. So the aim of this paper is to study the theoretical torque of single screw expanders under variable conditions. By comparation of experimental and theoretical results, we found that the error is in a permissible range. These results acquired here can provide theoretical foundation for estimating the output power of single screw expanders, selecting the type of single screw expanders, and even designing the single screw expanders.