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CLC number: TB61

On-line Access: 2011-02-08

Received: 2010-05-05

Revision Accepted: 2010-07-22

Crosschecked: 2011-01-06

Cited: 12

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Journal of Zhejiang University SCIENCE A 2011 Vol.12 No.2 P.146-153

http://doi.org/10.1631/jzus.A1000212


Experimental evaluation of the effect of an internal heat exchanger on a transcritical CO2 ejector system


Author(s):  Xiao-xiao Xu, Guang-ming Chen, Li-ming Tang, Zhi-jiang Zhu, Shuang Liu

Affiliation(s):  Institute of Refrigeration and Cryogenics, State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China

Corresponding email(s):   xuxiaoxiao19@126.com, gmchen@zju.edu.cn

Key Words:  CO2 ejector system, Transcritical cycle, Heating coefficient of performance (COPr)


Xiao-xiao Xu, Guang-ming Chen, Li-ming Tang, Zhi-jiang Zhu, Shuang Liu. Experimental evaluation of the effect of an internal heat exchanger on a transcritical CO2 ejector system[J]. Journal of Zhejiang University Science A, 2011, 12(2): 146-153.

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author="Xiao-xiao Xu, Guang-ming Chen, Li-ming Tang, Zhi-jiang Zhu, Shuang Liu",
journal="Journal of Zhejiang University Science A",
volume="12",
number="2",
pages="146-153",
year="2011",
publisher="Zhejiang University Press & Springer",
doi="10.1631/jzus.A1000212"
}

%0 Journal Article
%T Experimental evaluation of the effect of an internal heat exchanger on a transcritical CO2 ejector system
%A Xiao-xiao Xu
%A Guang-ming Chen
%A Li-ming Tang
%A Zhi-jiang Zhu
%A Shuang Liu
%J Journal of Zhejiang University SCIENCE A
%V 12
%N 2
%P 146-153
%@ 1673-565X
%D 2011
%I Zhejiang University Press & Springer
%DOI 10.1631/jzus.A1000212

TY - JOUR
T1 - Experimental evaluation of the effect of an internal heat exchanger on a transcritical CO2 ejector system
A1 - Xiao-xiao Xu
A1 - Guang-ming Chen
A1 - Li-ming Tang
A1 - Zhi-jiang Zhu
A1 - Shuang Liu
J0 - Journal of Zhejiang University Science A
VL - 12
IS - 2
SP - 146
EP - 153
%@ 1673-565X
Y1 - 2011
PB - Zhejiang University Press & Springer
ER -
DOI - 10.1631/jzus.A1000212


Abstract: 
This study presents experimental results focused on a performance comparison of a transcritical CO2 ejector system without an internal heat exchanger (IHX) (EJE-S) to a transcritical CO2 ejector system with an IHX (EJE-IHX-S). The comparison includes the effects of changes in operating conditions such as cooling water flow rate and inlet temperature. Experiments are conducted to assess the influence of the IHX on the heating coefficient of performance (COPr), heating capacity, entrainment ratio, pressure lift, and other parameters. The primary flow rate of the EJE-IHX-S is higher than that of the EJE-S. The pressure lift and actual ejector work recovery are reduced when the IHX is added to the transcritical CO2 ejector system. Using a more practical performance calculation, the compression ratio in the EJE-S is reduced by 10.0%–12.1%, while that of EJE-IHX-S is reduced only by 5.6%–6.7% compared to that of a conventional transcritical CO2 system. Experimental results are used to validate the findings that the IHX weakens the contribution of the ejector to the system performance.

Darkslateblue:Affiliate; Royal Blue:Author; Turquoise:Article

Reference

[1]Aprea, C., Maiorino, A., 2008. An experimental evaluation of the transcritical CO2 refrigerator performances using an internal heat exchanger. International Journal of Refrigeration, 31(6):1006-1011.

[2]Boewe, D., Bullard, C., Yin, J., Hrnjak, P.S., 2001. Contribution of internal heat exchanger to transcritical R744 cycle performance. International Journal of HVAC&R Research, 7(2):155-168.

[3]Chen, Y., Gu, J.J., 2005. The optimum high pressure for CO2 transcritical refrigeration systems with internal heat exchangers. International Journal of Refrigeration, 28(8):1238-1249.

[4]Elbel, S.W., Hrnjak, P.S., 2004. Effect of Internal Heat Exchanger on Performance of Transcritical CO2 Systems with Ejector. 10th International Refrigeration and Air Conditioning Conference at Purdue, West Lafayette, USA, Paper R166.

[5]Elbel, S.W., Hrnjak, P.S., 2006. A Thermodynamic Property Chart as a Visual Aid to Illustrate the Interference between Expansion Work Recovery and Internal Heat Exchanger. 11th International Refrigeration and Air Conditioning Conference at Purdue, West Lafayette, USA, Paper R165.

[6]Elbel, S.W., Hrnjak, P.S., 2008. Experimental validation of a prototype ejector designed to reduce throttling losses encountered in transcritical R744 system operation. International Journal of Refrigeration, 31(3):411-422.

[7]Giuliani, G., Hewitt, N.J., Marchesi, D.F., Polonara, F., 1999. Composition shift in liquid-recirculation refrigeration systems: an experimental investigation for the pure fluid R134a and the mixture R32/134a. International Journal of Refrigeration, 22(6):486-498.

[8]Hoegberg, M., Vamling, L., Bemtsson, T., 1993. Calculation methods for comparing the performance of pure and mixed working fluid in heat pump applications. International Journal of Refrigeration, 16(6):403-413.

[9]Kim, M.H., Pettersen, J., Bullard, C.W., 2004. Fundamental process and system design issues in CO2 vapor compression systems. Progress in Energy and Combustion Science, 30(2):119-174.

[10]Klein, S.A., Reindl, D.T., Brownell, K., 2000. Refrigeration system performance using liquid-suction heat exchangers. International Journal of Refrigeration, 23(8):588-596.

[11]Liu, S., 2008. Performance Study on an Ejector Used in CO2-Heat Pump Water Heater. MS Thesis, Zhejiang University, Hangzhou, China, p.1-76.

[12]Lorentzen, G., Pettersen, J., 1993. A new efficient and environmentally benign system for car air-conditioning. International Journal of Refrigeration, 16(1):4-12.

[13]Mu, J.Y., Chen, J.P., Chen, Z.J., 2003. System design and analysis of the transcritical carbon dioxide automotive air-conditioning system. Journal of Zhejiang University-SCIENCE A, 4(3):305-308.

[14]Robinson, D.M., Groll, E.A., 1998. Efficiencies of transcritical CO2 cycles with and without an expansion turbine. International Journal of Refrigeration, 21(7):577-589.

[15]Tao, Y.B., He, Y.L., Tao, W.Q., Wu, Z.G., 2010. Experimental study on the performance of CO2 residential air-conditioning system with an internal heat exchanger. Energy Conversion and Management, 51(1):64-70.

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