两相射流泵供液下的平板速冻实验研究
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摘要
为了验证两相射流泵在商用平板速冻机中应用的可行性,根据射流泵用作节流装置时可以回收制冷剂的膨胀功实现蒸发器倍量供液的基本原理,研究了射流泵供液的平板速冻机在25、30、35和40℃4个冷凝温度下的性能。实验结果表明:射流泵可以适应新型制冷剂R507并且可应用于1.3 t/批商用平板速冻机;平板速冻机的性能随着冷凝温度的升高先上升后下降。当冷凝温度为35℃时性能最佳,此时射流泵的引射系数比25℃时提升42.5%,比40℃时提升36.8%,而平板速冻机比使用热力膨胀阀供液时的冻结速率快7.7%,节约能耗7.4%。
In order to verify the feasibility of the application of ejector in commercial plate freezer,the performance of two-phase ejector is studied experimentally with condensing temperatures of 25 ℃,30 ℃,35 ℃ and 40 ℃.The results show that the ejector can adapt to the new refrigerant R507,and it is feasible to use the 1.3 t commercial plate freezer.The performance of the ejector tends to increase and then decrease with the condensing temperature.With the optimum condensing temperature of 35 ℃,the ER of the ejector can be improved by 42.5% from that at 25 ℃ and about 36.8% higher than that at 40 ℃.The freezing rate of the system with the ejector is about 7.7% faster than the expansion valve system,and the energy consumption is reduced by about 7.4%.
In order to verify the feasibility of the application of ejector in commercial plate freezer,the performance of two-phase ejector is studied experimentally with condensing temperatures of 25 ℃,30 ℃,35 ℃ and 40 ℃.The results show that the ejector can adapt to the new refrigerant R507,and it is feasible to use the 1.3 t commercial plate freezer.The performance of the ejector tends to increase and then decrease with the condensing temperature.With the optimum condensing temperature of 35 ℃,the ER of the ejector can be improved by 42.5% from that at 25 ℃ and about 36.8% higher than that at 40 ℃.The freezing rate of the system with the ejector is about 7.7% faster than the expansion valve system,and the energy consumption is reduced by about 7.4%.
引文
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[5] DOPAZO J A,FERNáNDEZ-SEARA J.Experimental evaluation of an ejector as liquid recirculator in an overfeed NH3 system with a plate evaporator[J].International Journal of Refrigeration,2011,34(7):1676-1683.
[6] DOPAZO J A,SEARA J F.Experimental evaluation of freezing processes in horizontal plate freezers using CO2 as refrigerant[J].2012,35:2093-2101.
[7] MINETTO S,BRIGNOLI R,ZILIO C,et al.Experimental analysis of a new method for overfeeding multiple evaporators in refrigeration systems[J].International Journal of Refrigeration,2014,38(1):1-9.
[8] 陈依水.喷射泵供液方式的单级压缩平板速冻机[J].制冷,1992(3):85-88.CHEN Yi-shui.Single stage compression plate freezer with supplying liquid by ejector[J].Refrigeration,1992(3):85-88.
[9] SUMERU K,H NASUTION,F N ANI.A review on two-phase ejector as an expansion device in vapor compression refrigeration cycle[J].Renewable & Sustainable Energy Reviews,2012,16(7):4927-4937.
[10] LAWRENCE N,ELBEL S.Analysis of two-phase ejector performance metrics and comparison of R134a and CO2 ejector performance[J].Science & Technology for the Built Environment,2015,21(5):515-525.
[11] PALACZ M,SMOLKA J,FIC A,et al.Application range of the HEM approach for CO2,expansion inside two-phase ejectors for supermarket refrigeration systems[J].International Journal of Refrigeration,2015,59:251-258.
[12] MEGDOULI K,TASHTOUSH B M,NAHDI E,et al.Performance analysis of a combined vapor compression cycle and ejector cycle for refrigeration cogeneration[J].International Journal of Refrigeration,2017,74:517-527.
[13] HOU W,WANG L,YAN J,et al.Simulation on the performance of ejector in a parallel hybrid ejector-based refrigerator-freezer cooling cycle[J].Energy Conversion & Management,2017,143:440-447.
[14] 万金庆,宋立尧,曹晓程,等.一种射流泵节流供液制冷系统[P].中国:CN102878715 B,2013-01-16.WAN Jin-qing,SONG Li-yao,CAO Xiao-cheng,et al.A throttle cooling system for ejector[P].China:CN 102878715 B,2013- 01-16.
[15] 曹晓程,万金庆,宋立尧,等.平板速冻机三种供液方式的实验比较[J].制冷学报,2015,36(6):78-82.CAO Xiao-cheng,WAN Jin-qing,SONG Li-yao,et al.Experimental comparison of three liquid supply system on plate freezer[J].Journal of Refrigeration,2015,36(6):78-82.
[2] TOMASEKM L,RADERMACHER R.Analysis of a domestic refrigerator cycle with an ejector[J].Ashrae Transactions,1995(1):1431-1438.
[3] KOZINSKIR C.Vehicle air conditioning system utilizing refrigerant recirculation within the evaporatorccumulator circuit[P].US:US 5493875 A,1996-02-27.
[4] 山田悦久,西嶋春幸,松井秀也,等,小型货车用喷射式冷冻机[J].制冷技术,2010(2):35-39.YAMADA E,NISHIJIMA H,MATSUI H,et al.Ejector system for small truck refrigerators[J].Refrigeration Technology,2010(2):35-39.
[5] DOPAZO J A,FERNáNDEZ-SEARA J.Experimental evaluation of an ejector as liquid recirculator in an overfeed NH3 system with a plate evaporator[J].International Journal of Refrigeration,2011,34(7):1676-1683.
[6] DOPAZO J A,SEARA J F.Experimental evaluation of freezing processes in horizontal plate freezers using CO2 as refrigerant[J].2012,35:2093-2101.
[7] MINETTO S,BRIGNOLI R,ZILIO C,et al.Experimental analysis of a new method for overfeeding multiple evaporators in refrigeration systems[J].International Journal of Refrigeration,2014,38(1):1-9.
[8] 陈依水.喷射泵供液方式的单级压缩平板速冻机[J].制冷,1992(3):85-88.CHEN Yi-shui.Single stage compression plate freezer with supplying liquid by ejector[J].Refrigeration,1992(3):85-88.
[9] SUMERU K,H NASUTION,F N ANI.A review on two-phase ejector as an expansion device in vapor compression refrigeration cycle[J].Renewable & Sustainable Energy Reviews,2012,16(7):4927-4937.
[10] LAWRENCE N,ELBEL S.Analysis of two-phase ejector performance metrics and comparison of R134a and CO2 ejector performance[J].Science & Technology for the Built Environment,2015,21(5):515-525.
[11] PALACZ M,SMOLKA J,FIC A,et al.Application range of the HEM approach for CO2,expansion inside two-phase ejectors for supermarket refrigeration systems[J].International Journal of Refrigeration,2015,59:251-258.
[12] MEGDOULI K,TASHTOUSH B M,NAHDI E,et al.Performance analysis of a combined vapor compression cycle and ejector cycle for refrigeration cogeneration[J].International Journal of Refrigeration,2017,74:517-527.
[13] HOU W,WANG L,YAN J,et al.Simulation on the performance of ejector in a parallel hybrid ejector-based refrigerator-freezer cooling cycle[J].Energy Conversion & Management,2017,143:440-447.
[14] 万金庆,宋立尧,曹晓程,等.一种射流泵节流供液制冷系统[P].中国:CN102878715 B,2013-01-16.WAN Jin-qing,SONG Li-yao,CAO Xiao-cheng,et al.A throttle cooling system for ejector[P].China:CN 102878715 B,2013- 01-16.
[15] 曹晓程,万金庆,宋立尧,等.平板速冻机三种供液方式的实验比较[J].制冷学报,2015,36(6):78-82.CAO Xiao-cheng,WAN Jin-qing,SONG Li-yao,et al.Experimental comparison of three liquid supply system on plate freezer[J].Journal of Refrigeration,2015,36(6):78-82.