Theoretical and Experimental Development of an Innovative Isothermal Oil-Free Co-rotating Scroll Compressor and Expander for Energy Storage
The development of an efficient isothermal turbine and compressor is essential for the realization of a small-scale compressed air energy storage(CAES).This article presents the theoretical and practical research results of an oil-free co-rotating scroll air compressor and turbine working with water injection to make the operations of expansion and compression as isothermal as possible.The theoretical performance is predicted with the help of a mathematical model using the equations of energy and mass conservation and the equation of state.This model takes into account the effects of water injection and volumetric losses.The experimental prototype is an oil-free scroll air compressor with the distinctive feature of having two mobile involutes working in synchronized co-rotation one relative to another.The prime-mover is an electric motor driving the two scrolls with two synchronizing belts.Water injection in the housing intends to provide a quasi-isothermal compression.The same device is used as an isothermal expander by supplying high-pressure air with water when it rotates backwards in expander mode,the electric motor acting then as a generator.Expected improvements to a standard scroll compressor and expander are a better volumetric efficiency and a greater power density due to a higher rotational speed of the scrolls,thanks to their symmetrical masses.The isothermal processes increase also the overall performance.
Compressed air energy storage Co-rotating scroll compressor Isothermal compression and expansion Oil-free volumetric compressor Water injection inside compressor and turbine
Angel IGLESIAS Daniel FAVRAT
Industrial Energy Systems Laboratory(LENI),(e)cole Polytechnique Fédérale de Lausanne(EPFL)1015 Lausanne,VD,Switzerland
国际会议
桂林
英文
1-14
2013-07-16（万方平台首次上网日期，不代表论文的发表时间）