頁籤選單縮合
題 名 | 乾濕球溫度對於相對濕度量測誤差之影響=Effects of the Relative Humidity Error from Measuring Dry Bulb and Wet Bulb Temperatures |
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作 者 | 陳加忠; 沈德欽; 雷鵬魁; | 書刊名 | 農業工程學報 |
卷 期 | 42:2 1996.06[民85.06] |
頁 次 | 頁88-98+49 |
分類號 | 432.523 |
關鍵詞 | 乾球溫度; 濕球溫度; 相對濕度; 量測誤差; 濕度計; Dry bulb temperature; Wet bulb temperature; Relative humidity; Measuring error; Psychometer; |
語 文 | 中文(Chinese) |
中文摘要 | 此研究中,探討以乾、濕球溫度值計算相對濕度之誤差特性。並以ASHRAE公式標準值比較經驗公式之適用性。比較乾、濕球溫度之量測誤差對於相對濕度值之計算誤差之影響能力。利用吸風式溫濕球溫度計以研究濕球溫度量測作業所需風速與作業時間。試驗結果顯示經驗公式中Penman公式最佳,準確度為±0.3%RH。乾、濕球溫度量測誤差同為高估或低估時,對相對濕度值計算之準確性影響不顯著。兩種溫度各為高估與低估時,對相濕度計算值則造成嚴重誤差。此研究中吸風式乾濕球溫度計所需之風速為3~5 m/s,作業時間為60秒以上。 |
英文摘要 | The errors of relative humidity by the calculation from the measurement values of dry bulb and wet bulb temperatures were analyzed. Four empirical equations used to calculate the RH value were compared with the standard values that adopted from the ASHRAE Standard model. The calculated bias and relative errors derived from the measured errors of temperature were evaluated. The required ventilation speed and period of an aspirated psychrometer were studied. The results of this study indicate that the Penman equation was the best empirical models to calculate the RH values. The accuracy is 0.3%. As the measuring errors for dry and wet bulb temperatures had the same pattern of over-estimated or underestimated values, the effect of the accuracy for the calculated RH values was insignificant. As one temperature is underestimated and the other is over-estimated, the calculated errors become so serious. An airspeed of 3m/s - 5 m/s and the operating period of 60 sec is the adequate technique for the measuring of wet bulb temperature. |
本系統中英文摘要資訊取自各篇刊載內容。