风速,温度与相对湿度测量精度的关系研究(英文)  

Study on relationships of wind velocity ,temperature and measurement precision of relative humidity

作　　者：黄晓因[1] 周平[2] 

机构地区：[1]云南农业大学计算机科学系,云南昆明650201 [2]云南农业大学农学与生物技术学院,云南昆明650201

出　　处：《浙江大学学报（农业与生命科学版）》2007年第3期322-327,共6页Journal of Zhejiang University:Agriculture and Life Sciences

基　　金：the National Natural Science Foundation of China(40265001);Yunnan Provincal ScienceFoundation(2002C0038 M)

摘　　要：农产品产后干燥加工环境普遍采用干湿球测湿法测量空气相对湿度.在温,湿度控制室内,对风速v,温度t,相对湿度U进行试验,结果指出:v的下界为0.2 m·s-1;当v>2.5 m·s-1后,按v=2.5m·s-1计算不影响测量精度;t<40℃时,干湿球系数A几乎不受t的影响;在40℃<t<70℃范围内,A值大体上与t的2/3次方成正比;t>80℃以后,A与t的关系变得复杂.提出了40℃<t<70℃范围内A的计算公式.经验证,在0.2<v<4 m·s-1,40℃<t<70℃和30%<U<90%R.H范围内,使用此公式计算获得的相对湿度值,误差<1.5%R.H.Psychrometric method is widely used to measure the air relative humidity in dryness processing of agricultural products. The experiments about the relationships of the wind velocity v, temperature t and relative humidity U were made in temperature humidity controlling cabin. The results indicate that the dowm limit of v is 0.2 m. s^-1 and has no influence on the measurement accuracy, regarding v as 2.5 m. s^-1 when v〉2.5 m.s^-1. The results also show that psychrometer constant A is hardly effected by the temperature when t〈40℃, and it is proportional to t2/3 within 40℃〈t〈70℃ ; The relationship of A and t becomes complication when t〉80℃. A formula about A is proposed within 40℃〈t〈70℃, and it is demonstrated that the error of the relative humidity calculated by this formula is less than 1.5 % R. H, when 0.2〈v〈 4 m.s^-1,40℃〈t〈70℃ and 30%〈 U〈90% R.H.

关 键 词：干湿球测湿法 风速 温度 相对湿度 计算方法 

分 类 号：TP806[自动化与计算机技术—检测技术与自动化装置] S163[自动化与计算机技术—控制科学与工程]