Effect of mixing chamber diameter on performance of transcritical CO2 heat pump system with ejector

doi:10.11949/j.issn.0438-1157.20151268

Abstract

Abstract:

The use of ejectors is one of the most promising methods to recover the throttling loss of transcritical CO₂ heat pump systems. Experimental investigation on the effect of mixing chamber diameter on the performance of transcritical CO₂ heat pump system with ejector was carried out. The mixing chamber diameter was 1.2, 1.4 and 1.6 mm, respectively. The hot water inlet temperature, as well as the evaporating temperature was kept constant in all experiments. Hot water outlet temperature as a variable was chosen to be the comparison reference of the experiments. The results showed that the effect of the mixing chamber diameter on the compressor exhaust temperature was relatively small. However, the diameter has a significant effect on the compressor exhaust pressure. The system with 1.6 mm mixing chamber diameter had the lowest compressor exhaust pressure and the highest heating coefficient of performance (COP). Moreover, for the performance of the ejector, the mixing chamber diameter had a greater effect on the entrainment ratio than the pressure lift ratio.

Key words: carbon dioxide, heat pump, recovery, transcritical, ejector, mixing chamber diameter, system performance

摘要：

通过在跨临界CO₂系统中引入喷射器是回收系统节流损失的有效手段。实验研究了混合室直径分别为1.2、1.4、1.6 mm时,对带喷射器的跨临界CO₂热泵整体性能以及喷射器自身性能的影响。整个实验中热水进口温度、蒸发温度不变,热水出口温度作为比较基准,在实验中为变量。结果表明,混合室直径对压缩机排气温度影响较小,而其对压缩机排气压力影响较大,当混合室直径为1.6 mm时,压缩机排气压力最小;当混合室直径为1.6 mm时,系统制热系数最高。

关键词: 二氧化碳, 热泵, 回收, 跨临界, 喷射器, 混合室直径, 系统性能

CLC Number:

TB61

WEI Jin, TANG Liming, QI Haiming, CHEN Qi, CHEN Guangming. Effect of mixing chamber diameter on performance of transcritical CO₂ heat pump system with ejector[J]. CIESC Journal, 2016, 67(5): 1719-1724.

魏晋, 唐黎明, 亓海明, 陈琪, 陈光明. 混合室直径对带喷射器的跨临界CO₂热泵性能影响[J]. 化工学报, 2016, 67(5): 1719-1724.

References 21

[1]	LORENTZEN G. The use of natural refrigerants: a complete solution to the CHC/HCFC predicament [J]. International Journal of Refrigeration, 1995, 18(3): 190-197.
[2]	ELBEL S. Historical and present developments of ejector refrigeration systems with emphasis on transcritical carbon dioxide air-conditioning applications [J]. International Journal of Refrigeration, 2011, 34(7): 1545-1561.
[3]	GAY N H. Refrigerating system: US1836318 [P]. 1931-12-15.
[4]	KORNHAUSER A A. The use of an ejector as a refrigerant expander [C]//Proceeding of the USNC/IIR-Purdue 1990 Refrigeration Conference. Indiana, USA: Purdue University, 1990.
[5]	SARKAR J. Optimization of ejector-expansion transcritical CO2 heat pump cycle [J]. Energy, 2008, 33(9): 1399-1406.
[6]	NAKAGAWA M, MARASIGAN A R, MATSUKAWA T, et al. Experimental investigation on the effect of mixing length on the performance of two-phase ejector for CO2 refrigeration cycle with and without heat exchanger [J]. International Journal of Refrigeration, 2011, 34(7): 1604-1613.
[7]	BANASIAK K, HAFNER A, ANDRESEN T. Experimental and numerical investigation of the influence of the two-phase ejector geometry on the performance of the R744 heat pump [J]. International Journal of Refrigeration, 2012, 35(6): 1617-1625.
[8]	LEE J S, KIM M S, KIM M S. Experimental study on the improvement of CO2 air conditioning system performance using an ejector [J]. International Journal of Refrigeration, 2011, 34(7): 1614-1625.
[9]	XU X, CHEN G, TANG L, et al. 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.
[10]	LUCAS C, KOEHLER J. Experimental investigation of the COP improvement of a refrigeration cycle by use of an ejector [J]. International Journal of Refrigeration, 2012, 35(6): 1595-1603.
[11]	MINETTO S, BRIGNOLI R, BANASIAK K, et al. Performance assessment of an off-the-shelf R744 heat pump equipped with an ejector [J]. Applied Thermal Engineering, 2013, 59(1): 568-575.
[12]	LI D, GROLL E A. Transcritical CO2 refrigeration cycle with ejector-expansion device [J]. International Journal of Refrigeration, 2005, 28(5): 766-773.
[13]	DENG J, JIANG P, LU T, et al. Particular characteristics of transcritical CO2 refrigeration cycle with an ejector [J]. Applied Thermal Engineering, 2007, 27(2): 381-388.
[14]	ELBEL S, HRNJAK P. Experimental validation of a prototype ejector designed to reduce throttling losses encountered in transcritical R744 system operation [J]. International Journal of Refrigeration, 2008, 31(3): 411-422.
[15]	ZHANG Z, MA Y, Wang H, et al. Theoretical evaluation on effect of internal heat exchanger in ejector expansion transcritical CO2 refrigeration cycle [J]. Applied Thermal Engineering, 2013, 50(1): 932-938.
[16]	徐肖肖, 陈光明, 唐黎明, 等. 带喷射器的跨临界CO2热泵热水器系统的实验研究[J]. 西安交通大学学报, 2009, 43(11):51-55. XU X X, CHEN G M, TANG L M, et al. Experiment on performance of transcritical CO2 heat pump water heater system with ejector [J]. Journal of Xi'an Jiaotong University, 2009, 43(1): 51-55.
[17]	唐黎明, 李涛, 吕宇捷, 等. 3种跨临界二氧化碳热泵热水器系统的实验研究[J]. 低温工程, 2012, 189(5):22-27. TANG L M, LI T, LÜ Y J, et al. Experimental study on three types of transcritical carbon dioxide heat pump water heater systems [J]. Cryogenics, 2012, 189(5): 22-27.
[18]	龚秀峰, 李敏霞, 马一太, 等. 跨临界CO2蒸气压缩/喷射制冷循环分析[J]. 工程热物理学报, 2014, 35(12):2343-2347. GONG X F, LI M X, MA Y T, et al. Thermodynamic analysis of a transcritical CO2 vapor compression/ejection refrigeration cycle [J]. Journal of Engineering Thermophysics, 2014, 35(12): 2343-2347.
[19]	Heat pump water heater for household and similar applications: GB/T 23137 [S]. 2008.
[20]	Performance rating of desuperhearter/water heaters: ANSI/AHRI 470 [S]. 2006.
[21]	Residential heat pump water heaters: JIS C9220 [S]. 2011.

Effect of mixing chamber diameter on performance of transcritical CO₂ heat pump system with ejector

混合室直径对带喷射器的跨临界CO₂热泵性能影响

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