浙江大学学报（农业与生命科学版）
浙江大學學報（農業與生命科學版）
절강대학학보（농업여생명과학판）
JOURNAL OF ZHEJIANG UNIVERSITY(AGRICULTURE & LIFE SCIENCES)
2007年
3期
322-327
,共6页
干湿球测湿法%风速%温度%相对湿度%计算方法
榦濕毬測濕法%風速%溫度%相對濕度%計算方法
간습구측습법%풍속%온도%상대습도%계산방법
psychrometric method%wind velocity%temperature%relative humidity%calculation
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:口的下界为0.2 m·s-1;当v＞2.5 m·s-1后,按v-2.5 m·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;f＞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.
農產品產後榦燥加工環境普遍採用榦濕毬測濕法測量空氣相對濕度.在溫,濕度控製室內,對風速v,溫度t,相對濕度U進行試驗,結果指齣:口的下界為0.2 m·s-1;噹v＞2.5 m·s-1後,按v-2.5 m·s-1計算不影響測量精度;t＜40℃時,榦濕毬繫數A幾乎不受t的影響;在40℃＜t＜70℃範圍內,A值大體上與t的2/3次方成正比;f＞80℃以後,A與t的關繫變得複雜.提齣瞭40℃＜t＜70℃範圍內A的計算公式.經驗證,在0.2＜v＜4 m·s-1,40℃＜t＜70℃和30%＜U＜90%R.H範圍內,使用此公式計算穫得的相對濕度值,誤差＜1.5%R.H.
농산품산후간조가공배경보편채용간습구측습법측량공기상대습도.재온,습도공제실내,대풍속v,온도t,상대습도U진행시험,결과지출:구적하계위0.2 m·s-1;당v＞2.5 m·s-1후,안v-2.5 m·s-1계산불영향측량정도;t＜40℃시,간습구계수A궤호불수t적영향;재40℃＜t＜70℃범위내,A치대체상여t적2/3차방성정비;f＞80℃이후,A여t적관계변득복잡.제출료40℃＜t＜70℃범위내A적계산공식.경험증,재0.2＜v＜4 m·s-1,40℃＜t＜70℃화30%＜U＜90%R.H범위내,사용차공식계산획득적상대습도치,오차＜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.
