Performance of two-phase ejector in compression/ejection refrigeration cycle

被引：0

作者：

Wang, Fei ^{[1
]}

Lü, Henglin ^{[1
]}

Feng, Wei ^{[1
]}

Shen, Shengqiang ^{[2
]}

机构：

[1] School of Architecture and Engineering, China University of Mining and Technology, Xuzhou 221116, Jiangsu

[2] Key Laboratory for Desalination of Liaoning Province, School of Energy and Power Engineering, Dalian University of Technology, Dalian 116024, Liaoning

来源：

Huagong Xuebao/CIESC Journal | 2012年 / 63卷 / 10期

关键词：

Choking; Compression/ejection; Condensation shock; Mixing pressure; Two-phase ejector;

D O I：

10.3969/j.issn.0438-1157.2012.10.013

中图分类号：

学科分类号：

摘要：

Taking into account of the phenomena of choking in entrained flow and condensation shock in mixing chamber, a thermodynamic model of two-phase ejector was established by using mass, momentum and energy balances. In the simulation, the mixing area in the mixing chamber is constant. With R141b as refrigerant, the pressure change in the ejector at various mixing pressures was studied, and the effects of mixing pressure on the performance of compression/ejection cycle, the entrainment ratio and exit pressure of ejector were analyzed. The variations of optimum suction chamber pressure drop, the corresponding ejector entrainment ratio, the system optimum performance coefficient and the corresponding performance improvement ratio with condensation temperature and evaporation temperature were presented. The results show that under the operation conditions in this study, no condensation shock occurs in the mixing chamber of two-phase ejector. The constant area model for mixing chamber is more appropriate than constant pressure model. It is important to choose appropriate mixing pressure for optimizing the system performance, and the optimum mixing pressure, at which the ejector has the highest entrainment ratio, is slightly lower than the pressure of entrained flow but far larger than the critical pressure entrained flow.

引用

页码：3094 / 3100

页数：6

共 11 条

[1] Kemper G.A., Harper G.F., Brown G.A., Multiple phase ejector refrigeration system
[2] Kornhauser A.A., The use of an ejector as a refrigerant expander, Proceeding of the 1990 USNC/IIR-Perdue Refrigeration Conference, pp. 10-19, (1990)
[3] Nehdi E., Kairouani L., Bouzaina M., Performance analysis of vapour compression cycle using ejector as an expander, Int. J. Energ. Res, 31, 4, pp. 364-375, (2007)
[4] Deng J., Jiang P., Lu T., Wang G., Lu W., Theoretical analysis of a transcritical CO <sub>2</sub> vapor compression/ejection refrigeration cycle, J. Tsinghua Univ.: Sci. & Tech, 46, 5, pp. 670-673, (2006)
[5] Fan X., Yin J., Liu H., Chen Z., Study on a new kind of vapor-compression/ejection hybrid refrigeration cycle, Journal of Xi'an Jiaotong University, 30, 5, pp. 5-11, (1996)
[6] Bilir N., Ersoy H.K., Performance improvement of the vapour compression refrigeration cycle by a two-phase constant area ejector, Int. J. Energ. Res, 33, 5, pp. 569-480, (2009)
[7] Liu J., Chen J., Chen Z., Ejector in compression/ejection hybrid refrigerator: Design and performances, Journal of Applied Sciences, 24, 6, (2006)
[8] Li T., Sun M., Li Q., Chen Y., Yuan X., Performance of transcritical carbon dioxide system with ejector, Journal of Xi'an Jiaotong University, 40, 5, pp. 553-557, (2006)
[9] Li D.Q., Groll E.A., Transcritical CO <sub>2</sub> refrigeration cycle with ejector-expansion device, International Journal of Refrigeration, 28, 5, pp. 766-773, (2005)
[10] Liao S.M., Zhao T.S., Jakobsen A., Correlation of optimal heat rejection pressures in transcritical carbon dioxide cycles, Applied Thermal Engineering, 20, 9, pp. 831-841, (2000)

← 1 2 →