敦煌地区干热与干冷环境特征研究

Environmental Characteristics of Dry Heat and Dry Cold in Dunhuang Area

目的建立大气环境干热、干冷环境特征的表征方法,以便定量表征大气环境干热、干冷的严酷性,为高分子材料及产品在该地区的老化试验与评估提供参考。方法设置温度-相对湿度组合为临界值,统计给定时期内温度高于临界温度、相对湿度低于临界相对湿度的时间为干热时间,统计给定时间内温度低于临界温度、相对湿度低于临界相对湿度的时间为干冷时间,并以干热时间、干冷时间占给定时期总时间的百分比来表征干热、干冷环境特征,研究临界条件、数据间隔时间对干热、干冷特征的影响。结果以25℃RH40%、5℃RH40%为临界条件分别统计干热时间和干冷时间的月、年百分比,可表征大气环境的干热、干冷特征。敦煌6、7月份为干热严酷月,月干热时间百分比超过40%,1、2月份为干冷严酷月,月干冷时间百分比可超过70%。结论临界温度、临界相对湿度、统计年份、数据间隔时间等对统计结果有较大的影响。

The work aims to establish a characterization method for the characteristics of dry heat and dry cold environments in atmospheric environment,so as to quantitatively characterize the harshness of dry heat and dry cold in atmospheric environment,and to provide reference for the aging test and evaluation of polymer materials and products in this area.The combination of temperature and relative humidity was set as a critical value.The time of temperature above critical temperature and relative humidity below critical relative humidity was defined as dry-heat time;the time of temperature below critical temperature and relative humidity below critical relative humidity was defined as dry-cooling time.And the dry-heat and dry-cooling environment characteristics were characterized by dry-heat time,dry-cooling time as a percentage of total time in a given period.With 25℃RH 40%and 5℃RH 40%as the critical condition,the monthly and annual percentages of dry-heat time and dry-cooling time can counted to characterize the characteristics of dry-heat and dry-cooling in atmospheric environment.June and July of Dunhuang were dry-heat severe month,the monthly dry-heat time percentage was more than 40%,January and February were dry-cold severe months,and the monthly dry-cooling time percentage can exceed 70%.The critical temperature,critical relative humidity,statistical year,data interval time,etc.have great influence on the statistical results.