摘要
本文对风冷式冷藏保温箱送风过程进行实验研究,采用热源法测试冷藏保温箱漏热系数,冷藏保温箱内和门封四周的温度变化,建立降温时间模型,计算冷藏保温箱最佳送风量。结果表明:冷藏保温箱从环境温度降到0℃的时间,计算与实验结果的最大误差为6.93%,平均误差为5.77%;从2℃降到0℃时间的最大误差为6.15%,平均误差为5.28%,其计算模型精度较高。冷藏保温箱降温时间随送风量的增加而减短,且降温时间的减小幅度越来越小,综合考虑降温时间和初投资,送风量选择0.021m^3/s比较合适;由于门封四周密封不均匀,门封测点12#处温度最低,环境温度为10、20、30℃时,其结露临界相对湿度分别为64.4%、64.9%、52.1%,阴雨天气门封结露的可能性较大。
Experiment on air supply of refrigerated incubator was performed. Heat leakage coefficient of refrigerated incubator was tested by heat source method. Temperatures in incubator and around door seal were recorded. Cooling time model was set up. The optimum air supply was worked ont. The results show that maximum and average error of cooling time from environment temperature to 0 ℃ of refrigerated incubator between calculated value and experimental value are respectively 6.93% and 5. 77%. Similarly those of cooling time from 2 ℃ to 0 ℃ are 6.15% and 5.28% , it is meaning that calculation model of cooling time is high in precision. With the increase of supply air, cooling time of refrigerated incubator becomes shorter, decrease rate of cooling time becomes smaller and smaller. Air supply of 0.021m^3/s is considered to be more appropriate based on a comprehensive consideration of cooling time and initial investment. Temperature at point 12# around door seal is the lowest, the relative humidities of critical condensation at ambient temperature of 10, 20 and 30 ℃ are respectively 64.4% , 64.9% and 52.1% , the wet weather was likely to show dew.
出处
《低温与超导》
北大核心
2017年第12期62-66,79,共6页
Cryogenics and Superconductivity
基金
天津市科技计划项目(14TXGCCX00018)
关键词
冷藏保温箱
风冷
降温时间
漏热率
相对湿度
Refrigerated incubator, air cooled, Cooling time, Heat leakage rate, Relative humidity
