跨临界CO2双级压缩空气源热泵循环的高级㶲分析
关键词：CO2高级㶲分析空气源热泵优化可避免㶲损不可避免㶲损内因㶲损外因㶲损
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[3] DILSHAD S,KALAIR A R,KHAN N.Review of carbon dioxide (CO2) based heating and cooling technologies:past,present,and future outlook[J].International journal of energy research,2019,44(3):1408- 1463.
[4] KELLY S,TSATSARONIS G,MOROSUK T.Advanced exergetic analysis:approaches for splitting the exergy destruction into endogenous and exogenous parts[J].Energy,2009,34(3):384- 391.
[5] MOROSUK T,TSATSARONIS G.Advanced exergetic evaluation of refrigeration machines using different working fluids[J].Energy,2009,34(12):2248- 2258.
[6] GONG S Y,BOULAMA K G.Parametric study of an absorption refrigeration machine using advanced exergy analysis[J].Energy,2014,76:453- 467.
[7] CHEN J Y,HAVTUN H,PALM B.Conventional and advanced exergy analysis of an ejector refrigeration system[J].Applied energy,2015,144:139- 151.
[8] SARKAR J,JOSHI D.Advanced exergy analysis of transcritical CO2 heat pump system based on experimental data[J].Sādhanā,2016,41(11):1349- 1356.
[9] BAI T,YU J L,YAN G.Advanced exergy analyses of an ejector expansion transcritical CO2 refrigeration system[J].Energy conversion and management,2016,126:850- 861.
[10] 黄卓.一种R744超市双温制冷系统的优化及3E评估[D].济南：山东大学，2019:52- 56.
[11] AGRAWAL N,BHATTACHARYYA S,SARKAR J.Optimization of two-stage transcritical carbon dioxide heat pump cycles[J].International journal of thermal sciences,2007,46(2):180- 187.
[12] MOSAFFA A H,GAROUSI FARSHI L,INFANTE FERREIRA C A,et al.Exergoeconomic and environmental analyses of CO2/NH3 cascade refrigeration systems equipped with different types of flash tank intercoolers[J].Energy conversion and management,2016,117:442- 453.
[13] NEKSA P.CO2 heat pump systems[J].International journal of refrigeration,2002,25(4):421- 427.
[14] 田华，马一太，王洪利，等.CO2跨临界双级压缩带中间冷却器系统[J].天津大学学报，2010,43(8):685- 689.
[15] 刘圣春，李正.CO2跨临界双级压缩制冷循环的热力学分析[J].制冷技术，2016,36(4):8- 13.
Advanced exergy analysis of transcritical CO2two-stage compressed air-source heat pump cycle
Abstract: At present, the air-source heat pump with natural refrigerant CO2 has a very good application prospect. In order to tap its energy saving potential, the conventional exergy analysis method has been improved, and an advanced exergy analysis method has been adopted to further study the cycle of a transcritical CO2 two-stage compressed air-source heat pump. The results show that the proportion of the avoidable endogenous exergy loss of the system is 46.88%, which can be avoided by improving the system component performance. From the angle of advanced exergy analysis, the proportion of the low pressure compressor, the proportion of the high pressure compressor and the proportion of the expander have the highest optimization priority. The exergy loss of the proportion of the high pressure compressor accounts for 25.37% of the total exergy loss, and the optimization of the proportion of the high pressure compressor can significantly improve the system performance. The exergy loss of the evaporator is all caused by internal factors. The exogenous exergy loss and the proportion of the avoidable exergy loss of the throttle valve are negative, and the system performance can be improved by replacing other throttling equipment. There is an optimal high pressure corresponding to the highest exergy efficiency in the system. When the high pressure increases from 8 MPa to 10 MPa, the avoidable endogenous exergy loss of the proportion of the high pressure compressor increases by 1.96%.
Keywords: carbon dioxide; advanced exergy analysis; air-source heat pump; optimization; avoidable exergy loss; unavoidable exergy loss; endogenous exergy loss; exogenous exergy loss;
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