复叠与双级压缩系统的模拟对比分析
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摘要
为了探究双级压缩制冷系统和复叠式制冷系统在低温环境下运行的可行性和经济性,在冷凝温度30℃,蒸发温度-20℃~-50℃工况下,通过EES模拟,将四种双级压缩循环方式分别与复叠式循环方式进行对比分析。研究表明:在蒸发温度从-20℃降到-50℃的工况下,同蒸发温度下,复叠循环系统的COP比一次节流中间完全(不完全)冷却循环系统的COP高20%,对于一次节流中间完全(不完全)冷却循环与复叠循环,系统COP都降低50%;对于二次节流中间完全(不完全)冷却循环与复叠循环,在同蒸发温度下,复叠循环系统的COP与二次节流中间完全冷却循环系统的COP相差不大,复叠循环系统的COP低于二次节流中间不完全冷却循环系统的COP,但二次节流的两个节流阀口径大,难协调并且系统回油不均,无法长期稳定运行。因此,在低温工况下(-20℃~-50℃)复叠循环相比于双级压缩循环具有更高的节能性、可行性。
In order to explore the feasibility and economy of the two-stage compression refrigeration system and cascade refrigeration system running in low temperature environment,with the condensation temperature of 30 ℃ and the evaporation temperature of-20℃ to-50℃,we compared and analyzed four kinds of two-stage compression cycles and cascade refrigeration system by EES simulation method. The study shows that: when the evaporation temperature reduced from-20℃ to-50℃,at the same evaporation temperature,the COP of the cascade refrigeration system is 20% higher than the COP of the primary throttling central complete(incomplete) compression refrigeration system,but the COP is both reduces by 50% to the cascade refrigeration system and primary throttling central complete(incomplete) compression refrigeration system; at the same evaporation temperature,the COP of the cascade refrigeration system is slightly less than the secondary throttling central complete(incomplete)compression refrigeration system,but in the secondary throttling central complete(incomplete) compression refrigeration system,the diameter of the two throttle valves is large,so it is difficult to coordinate and the system can not return to the oil well,so it can't run steadily for a long time. Therefore,at low temperature(-20℃ to-50℃),compared to the two-stage compression cycle,the cascade cycle has higher energy saving and feasibility.
In order to explore the feasibility and economy of the two-stage compression refrigeration system and cascade refrigeration system running in low temperature environment,with the condensation temperature of 30 ℃ and the evaporation temperature of-20℃ to-50℃,we compared and analyzed four kinds of two-stage compression cycles and cascade refrigeration system by EES simulation method. The study shows that: when the evaporation temperature reduced from-20℃ to-50℃,at the same evaporation temperature,the COP of the cascade refrigeration system is 20% higher than the COP of the primary throttling central complete(incomplete) compression refrigeration system,but the COP is both reduces by 50% to the cascade refrigeration system and primary throttling central complete(incomplete) compression refrigeration system; at the same evaporation temperature,the COP of the cascade refrigeration system is slightly less than the secondary throttling central complete(incomplete)compression refrigeration system,but in the secondary throttling central complete(incomplete) compression refrigeration system,the diameter of the two throttle valves is large,so it is difficult to coordinate and the system can not return to the oil well,so it can't run steadily for a long time. Therefore,at low temperature(-20℃ to-50℃),compared to the two-stage compression cycle,the cascade cycle has higher energy saving and feasibility.
引文
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[10]程有凯,常琳,张文虎,等.两级压缩与复叠式制冷方式的比较[J].制冷与空调,2004(3):66-69.
[2]张建一,宋怡梦.单级压缩或双级压缩制冷的技术经济分析[J].低温与超导,2009,37(12):23-28.
[3]原惠惠.双级压缩制冷系统设计及实验研究[D];郑州:郑州大学,2016.
[4]Bertsch S S,Groll E A.Two-stage air-source heat pump for residential heating and cooling applications in northern U.S.climates[J].International Journal of Refrigeration,2008,31(7):1282-1292.
[5]李军.复叠制冷系统:理论分析篇[J].制冷与空调,2010,10(5):16-19.
[6]郭耀君,谢晶,朱世新,等.双级压缩与复叠式压缩制冷系统的技术经济分析[J].化工进展,2015,34(8):3194-3201.
[7]王炳明,于志强,姜绍明,等.NH3/CO2复叠制冷系统实验研究[J].制冷学报,2009,30(3):21-24.
[8]周丹,元爱民,李大鹏,等.R404A/CO2复叠式制冷系统与R404A双级压缩式制冷系统热力性能对比分析[J].制冷与空调,2015,15(5):38-41.
[9]Park H,Kim D H,KIM M S.Thermodynamic analysis of optimal intermediate temperatures in R134a–R410A cascade refrigeration systems and its experimental verification[J].Applied Thermal Engineering,2013,54(1):319-327.
[10]程有凯,常琳,张文虎,等.两级压缩与复叠式制冷方式的比较[J].制冷与空调,2004(3):66-69.