摘要
为解决制冷剂除霜系统融霜结束后可能发生的压缩机湿压缩和库温波动问题,本文在库温-20℃、结霜量3 kg工况下,以风机延时开启的时间为变量,对除霜结束后风机延时开启0~180 s进行单一变量的实验研究。从除霜结束后的库温波动、除霜时间、系统恢复制冷后压缩机吸气状态方面,比较分析风机延时不同时间开启对系统运行特性的影响。结果表明:除霜结束不延时开启风机,库温将突升5℃,并且恢复制冷的前4 min,压缩机存在湿压缩问题;除霜结束风机延时开启的最佳时间为140~180 s,此时库温升高比风机不延时开启情况降低3℃,总库温波动在5℃以内,除霜时间在12 min左右,且除霜结束恢复制冷时有效避免了压缩机可能出现的湿压缩问题。
In order to solve the problem of the probable wet compression and temperature fluctuation of cold storage after liquid refrigerant defrosting operation, the method of fan delayed running is proposed. Taking the delayed time of fan running as a variable parameter, the experiment has conducted under the condition of -20 ℃ cold storage temperature and 3 kg weight of frost with the delayed time of fan running from 0 s to 180 s after the finish of defrost. The system parameters such as temperature fluctuation of cold storage after the finish of defrosts, defrosting time and the suction parameters of the compressor after system returning to work are analyzed and compared for dif- ferent delay time of fan running. The result shows that running the fan without delay after defrosting, the cold storage temperature will sud- den rise 5 ~C and wet compression occurs for the first 4 rain after refrigeration is resumed ; the best delay time of fan running is 140 s to 180 s after defrosting and the rise of temperature in cold storage is 3 ~C lower than that in the condition without fan delaying, and the tem- perature fluctuation of cold storage is within 5 ℃. The defrosting time is about 12 min, and the probable wet compression is completely a- voided after refrigeration system returns to work.
出处
《制冷学报》
CAS
CSCD
北大核心
2017年第2期114-118,共5页
Journal of Refrigeration
基金
天津科技创新体系及平台建设计划(14TXGCCX00018)
天津市科技特派员项目(15JCTPC62700,16JCTPJC47800)
天津市应用基础与前沿技术研究计划(16JCQNJC06600)资助~~
关键词
冷库
制冷剂除霜
库温波动
湿压缩
cold storage
liquid refrigerant defrosting
temperature fluctuation
wet compression
