摘要
目的:研究在不同季节工况、蒸发温度为25℃条件下,高温压缩机转速对NH_(3)/CO_(2)复叠制冷系统性能的影响。方法:建立NH_(3)/CO_(2)复叠制冷系统模型并验证其可靠性,计算分析高温压缩机转速与系统高温蒸发温度、高温排气温度、中间温度、高温压缩机功率、制冷量、性能系数的变化关系。结果:仿真模型对制冷量的预测与理论值的相对误差小于14.1%。高温压缩机转速从2300 r/min增至3300 r/min,春季、夏季、秋季、冬季工况下的制冷量分别提升了31.7%,41.7%,33.9%,25.2%,且在低转速范围内冬季制冷量最高;高温压缩机功率呈两段式上升趋势,提升了40%~45%。结论:存在使得性能系数最大的最佳高温压缩机转速。基于系统对不同季节工况的适应性问题,提出了变转速NH_(3)/CO_(2)复叠制冷系统方案,与定转速系统相比每年可减少19.9%耗电量。
Objective:This study aimed to research the influence of different rotation speed of high-temperature compressor on the performance of NH_(3)/CO_(2)cascade refrigeration system under various seasons and evaporation temperature of 25℃.Methods:The NH_(3)/CO_(2)cascade refrigeration system model was established and its reliability was verified in this paper.The relationship between the rotation speed of high-temperature compressor and the evaporation temperature,the discharge temperature,the intermediate temperature,high-temperature compressor power,cooling capacity,Coefficient of Performance(COP)of cascade refrigeration system was calculated and analyzed.Results:The relative error of the simulation model for predicting the heat transfer was less than 14.1%.The cooling capacity of the system in spring,summer,autumn and winter respectively increases by 31.7%,41.7%,33.9%and 25.2%as the rotation speed of the high-temperature compressor increased from 2300 r/min to 3300 r/min,and the cooling capacity was the highest in winter in the low-speed range.In addition,high temperature compressor power showed a two-stage upward trend,increased by 40%~45%.Conclusion:There was a maximum COP and corresponding optimal high-temperature compressor speed.Based on the adaptability of the system to different seasons,a scheme of variable rotation speed NH_(3)/CO_(2)cascade refrigeration system is proposed.Compared with the system with constant speed,the power consumption could be reduced by 19.9%per year.
作者
叶梦莹
顾众
谢晶
YE Meng-ying;GU Zhong;XIE Jing(College of Food Science and Technology,Shanghai Ocean University,Shanghai 201306,China;Shanghai Professional Technology Service Platform on Cold Chain Equipment Performance and Energy Saving Evaluation,Shanghai 201306,China;Shanghai Engineering Research Center of Aquatic Product Processing&Preservation,Shanghai 201306,China;National Experimental Teaching Demonstration Center for Food Science and Engineering〔Shanghai Ocean University〕,Shanghai 201306,China)
出处
《食品与机械》
北大核心
2021年第9期104-109,116,共7页
Food and Machinery
基金
国家“十三五”重点研发项目课题(编号:2019YFD0901604)
上海市科委科技创新行动计划(编号:19DZ1207503)
上海市科委公共服务平台建设项目(编号:20DZ2292200)。
关键词
复叠制冷系统
压缩机
变转速
季节
循环性能
NH_(3)
CO_(2)
cascade refrigeration system
compressor
variable rotation speed
different seasons
cycle performance
NH_(3)
CO_(2)
