不完全过热对R32转子式压缩机低频运行性能的影响
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摘要
适当地降低压缩机频率可实现省电节能,但频率过低也会对运行效率产生不同程度的影响。通过将压缩机低频运行于过热区间至吸气带液区间,研究不完全过热循环下的压缩机的运行机理及效率。结果表明:控制干度x∈[0.96,1)时,极低频率下压缩机能耗减少,系统压比进一步降低,排气温度的下降幅值超过了过热段的28.9%～40.3%;运行于低于额定频率附近时,容积效率较之常规控制过热度区间仅降低0.8%～1.3%,电效率也仅降低0.3%～0.7%,但该趋势与频率变化呈反比;在该范围内更高的性能系数COP使得综合效率系数更为完善。
Energy saving can be achieved by appropriately reducing the compressor frequency,but too low frequency will have an impact on operational efficiency to different degree. By making the compressor operate at low frequency in the superheating interval to the two-phase suction interval,the operating mechanism and efficiency of the compressor under incomplete superheating cycle were studied. The results show that the energy consumption of the compressor is reduced and the pressure ratio of the system is decreased further at extremely low frequencies when the quality x ∈[0.96,1),and the reduction amplitude of exhaust temperature exceeds 28.9%～40.3% of the superheated section;When operating near the frequencies below the rated frequency,the volumetric efficiency is only reduced by 0.8%～1.3% compared to the conventional control superheat interval,and the electrical efficiency is only reduced by 0.3%～0.7%,but the trend is inversely proportional to the change of frequency.A higher coefficient of performance COP within this range leads to a more complete coefficient of comprehensive efficiency.
Energy saving can be achieved by appropriately reducing the compressor frequency,but too low frequency will have an impact on operational efficiency to different degree. By making the compressor operate at low frequency in the superheating interval to the two-phase suction interval,the operating mechanism and efficiency of the compressor under incomplete superheating cycle were studied. The results show that the energy consumption of the compressor is reduced and the pressure ratio of the system is decreased further at extremely low frequencies when the quality x ∈[0.96,1),and the reduction amplitude of exhaust temperature exceeds 28.9%～40.3% of the superheated section;When operating near the frequencies below the rated frequency,the volumetric efficiency is only reduced by 0.8%～1.3% compared to the conventional control superheat interval,and the electrical efficiency is only reduced by 0.3%～0.7%,but the trend is inversely proportional to the change of frequency.A higher coefficient of performance COP within this range leads to a more complete coefficient of comprehensive efficiency.
引文
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[22]杨丽辉,陶乐仁,陶宏,等.滚动转子式压缩机吸气状态与排气温度的试验研究[J].制冷学报,2014,35(2):49-53.
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[25]虞中旸,陶乐仁,王超,等.变频滚动转子式压缩机变吸气状态试验研究与模型建立[J].化工进展,2017,36(3):832-838.
[26]孙帅辉,郭鹏程,孙龙刚,等.变吸气工况R32涡旋压缩机湿压缩过程模拟研究[J].西安理工大学学报,2015,31(3):282-288.
[27]陈华俊,马国远,石文星.变频滚动转子压缩机容积效率的频率修正方法[J].流体机械,2001,29(10):12-19.
[28]马一太,刘忠彦,李敏霞.容积式制冷压缩机电效率的分析[J].制冷学报,2013,34(3):1-7.
[2]金听祥,李冠举,郑祖义.变频空调器性能影响因素的试验研究[J].中国建设信息:供热制冷,2010(9):66-69.
[3]刘光华.变频制冷机组的回油设计[J].制冷与空调,2012,12(6):28-31.
[4]肖学智,周晓芳,徐浩阳,等.低GWP制冷剂研究现状综述[J].制冷技术,2014,34(6):37-42.
[5]臧润清,车晶.小型制冷压缩机的湿行程及其防治[J].压缩机技术,2000(3):8-10.
[6]矢岛龙三郎,吉见敦史,朴春成.降低R32压缩机排气温度的方法[J].制冷与空调,2011,11(2):60-64.
[7]张良,徐士鸣.湿蒸汽两相压缩过程工作特性理论研究节能技术,2006,136(24):99-102.
[8]陈二锋,王志标,张早校,等.活塞压缩机喷水内冷却过程的性能分析[J].压缩机技术,2005(2):5-13.
[9]张利,陆颖翀.吸气干度对R32压缩机可靠性影响研究[J].电器,2013(S1):703-706.
[10]王超,陶乐仁,黄理浩,等.R32制冷系统湿压缩的最佳吸气干度范围[J].化工进展,2017,36(1):100-106.
[11]胡地,李红旗.滚动转子式压缩机的技术现状及发展趋势[J].制冷与空调,2017,17(2):73-79.
[12]任峰,石小雷.滚动转子压缩机的性能拟合方程的建立和试验验证[J].制冷与空调,2009,9(6):50-53.
[13]李文华,谷波.滚动转子式、涡旋式压缩机在制冷空调领域的应用现状及展望[J].流体机械,1999(12):52-54.
[14]Authors U.The american society of heating,refrigerating,and air-conditioning engineers[J].Contractor Magazine,1997(10):51.
[15]刘颖,王如竹,李云飞,等.热泵工况下滚动转子式压缩机试验研究[J].低温工程,2001,123(5):53-57.
[16]田晓亮,王兆俊,赵先星.常规50Hz压缩机变频性能试验[J].青岛大学学报(工程技术版),1998(4):61-64.
[17]郭仁宁,王建,杨柳.基于涡旋压缩机比功率的结构参数优化研究[J].压缩机技术,2008(4):11-13.
[18]王柳,林江波.涡旋压缩机用电机冷却系统CFD传热分析[J].流体机械,2017,45(2):57-61.
[19]宫天泽,郑学利,赵宇开.变频压缩机综合效率系数的研究与应用[J].节能技术,2012,30(5):435-438.
[20]杨亮,朱瑞琪.以压缩机排气温度为控制参数的电子膨胀阀流量控制系统的研究[D].西安:西安交通大学,2000.
[21]吕鹏,曹建文,陈文卿,等.喷油对变频螺杆压缩机性能影响的试验研究[J].压缩机技术,2016(1):27-31.
[22]杨丽辉,陶乐仁,陶宏,等.滚动转子式压缩机吸气状态与排气温度的试验研究[J].制冷学报,2014,35(2):49-53.
[23]马国远,李红旗.旋转压缩机[M].北京:机械工业出版社,2001:102.
[24]吴业正,李红旗,张华,等.制冷压缩机:第3版[M].北京:机械工业出版社,2017:96.
[25]虞中旸,陶乐仁,王超,等.变频滚动转子式压缩机变吸气状态试验研究与模型建立[J].化工进展,2017,36(3):832-838.
[26]孙帅辉,郭鹏程,孙龙刚,等.变吸气工况R32涡旋压缩机湿压缩过程模拟研究[J].西安理工大学学报,2015,31(3):282-288.
[27]陈华俊,马国远,石文星.变频滚动转子压缩机容积效率的频率修正方法[J].流体机械,2001,29(10):12-19.
[28]马一太,刘忠彦,李敏霞.容积式制冷压缩机电效率的分析[J].制冷学报,2013,34(3):1-7.