MATHEMATICAL MODELING AND EXPERIMENTAL INVESTIGATION OF THE VANE MOTION OF A ROTARY VANE EXPANDER IN CO2 HEAT PUMP SYSTEM
This paper presents a rotary vane expander which is used in the transcritical CO2 refrigeration system to replace the throttling valve for the COP improvement. The internal leakage has been focused on by mathematical model and experiment study. In the mathematical model, the forces acted on the vane have been calculated to estimate whether the vane will fly out to the cylinder and contact with the surface tightly or not. The calculated result shows that the friction force between the vane and the vane slot will forbid the vane to contact with the cylinder surface all the time, when there is no extra force acted on the bottom of the vane, and some springs can help to solve this problem.A test rig has been set up to verify the modeling result. In the prototype, four pressure sensors have been placed to record the Pressure-Time (p-t) diagrams to indicate the working process of the expander and analysis the internal leakage. After adding springs in the vane, the rotary vane type expander can start easily and work stably in the CO2 transcritical refrigeration cycle.
CO2 Transcritical Cycle Rotary Vane Expander internal leakage
Bingchun YANG Hansong ZENG Bei GUO Xueyuan PENG Ziwen XING
Institute of Compressors, School of Energy and Power Engineering Xi’an Jiaotong University, Xi’an, China, 710049
国际会议
The 22nd International Congress of Refrigeration(第22届国际制冷大会)
北京
英文
2007-08-21（万方平台首次上网日期，不代表论文的发表时间）