In this work exergetical performance analysis is carried out based on the second law of thermodynamics for organic flash cycle(OFC) using a two-phase expander instead of throttle expansion in order to recover efficien...In this work exergetical performance analysis is carried out based on the second law of thermodynamics for organic flash cycle(OFC) using a two-phase expander instead of throttle expansion in order to recover efficiently finite thermal reservoirs.The exergy destructions(anergies) at various components of the system are theoretically investigated as well as the exergy efficiency.Results show that the anergy of heat exchanger or two-phase expander decreases while the anergy of throttle valve increases with increasing flash temperature,and the exergy efficiency has an optimum value with respect to the flash temperature.Under the optimal conditions with respect to the flash temperature,exergy efficiency increases with the heating temperature and the component having the largest exergy destruction varies with the flash temperature or heating temperature.展开更多
针对大型液氮储罐漏热而产生的冷量浪费和液氮气化而产生的超压问题,根据绝热膨胀制冷原理、节流膨胀原理,设计分别以刚性容器绝热放气、索尔文活塞膨胀以及节流膨胀等三种制冷方法,并对这三种方法的实际制冷性能进行了分析。分析结果表...针对大型液氮储罐漏热而产生的冷量浪费和液氮气化而产生的超压问题,根据绝热膨胀制冷原理、节流膨胀原理,设计分别以刚性容器绝热放气、索尔文活塞膨胀以及节流膨胀等三种制冷方法,并对这三种方法的实际制冷性能进行了分析。分析结果表明:刚性容器绝热放气、索尔文活塞膨胀、节流膨胀的理论制冷量分别为19. 34 k J/kg、27. 43 k J/kg、10. 76 k J/kg,实际制冷量分别为14. 51 k J/kg、12. 14 k J/kg、9. 37 k J/kg,索尔文活塞膨胀的理论制冷量最大,刚性容器绝热放气的实际制冷量最大。由于索尔文活塞膨胀的机械结构与热力过程的复杂性,使得索尔文活塞膨胀的效率最低。该研究结果为减少大型低温储罐的损耗提供了新的解决方向。展开更多
基金supported by Research Fund,Kumoh National Institute of Technology
文摘In this work exergetical performance analysis is carried out based on the second law of thermodynamics for organic flash cycle(OFC) using a two-phase expander instead of throttle expansion in order to recover efficiently finite thermal reservoirs.The exergy destructions(anergies) at various components of the system are theoretically investigated as well as the exergy efficiency.Results show that the anergy of heat exchanger or two-phase expander decreases while the anergy of throttle valve increases with increasing flash temperature,and the exergy efficiency has an optimum value with respect to the flash temperature.Under the optimal conditions with respect to the flash temperature,exergy efficiency increases with the heating temperature and the component having the largest exergy destruction varies with the flash temperature or heating temperature.
文摘针对大型液氮储罐漏热而产生的冷量浪费和液氮气化而产生的超压问题,根据绝热膨胀制冷原理、节流膨胀原理,设计分别以刚性容器绝热放气、索尔文活塞膨胀以及节流膨胀等三种制冷方法,并对这三种方法的实际制冷性能进行了分析。分析结果表明:刚性容器绝热放气、索尔文活塞膨胀、节流膨胀的理论制冷量分别为19. 34 k J/kg、27. 43 k J/kg、10. 76 k J/kg,实际制冷量分别为14. 51 k J/kg、12. 14 k J/kg、9. 37 k J/kg,索尔文活塞膨胀的理论制冷量最大,刚性容器绝热放气的实际制冷量最大。由于索尔文活塞膨胀的机械结构与热力过程的复杂性,使得索尔文活塞膨胀的效率最低。该研究结果为减少大型低温储罐的损耗提供了新的解决方向。
