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題 名 | 強制通風對散裝貯藏稻穀溫度變化之影響 |
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作 者 | 蔡致榮; | 書刊名 | 農業工程學報 |
卷 期 | 33:3 1987.09[民76.09] |
頁 次 | 頁51-66 |
分類號 | 434.252 |
關鍵詞 | 通風; 散裝; 貯藏; 溫度; 稻穀; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究以容積為0.35(m)³之通風試驗槽裝填70年第一期梗稻,放置於恆溫恆濕器內模擬穀倉通風作業,以觀察強制通風時稻穀溫度的變化情形。各組實驗之控制條件分別設定為通風量介於0.25~1.66CM/TON,模擬空氣溫度介於20~32℃,模擬空氣相對濕度介於60~90﹪,稻穀起始溫度則有40℃與35℃兩種。 綜合結果可得下列各點: 1.強制通風時通風量及稻穀與空氣間溫差是影響降溫速率的主要因素。通風量愈大時,通風降溫速率也愈大,反之亦反;而稻穀與空氣間溫差影響通風降溫速率的情形亦類似,唯通風後期當稻穀與空氣間溫差降低至2~3℃左右時無降溫效果,此時應停止通風以節約能源之消耗。 2.統計方法逐步迴歸分析的結果,降溫速率可被表成通風量,稻穀與空氣間溫差及空氣相對濕度的函數,其迴歸方程式如下所示,將使本研究之論點更形有力。 CR=0.5368-0.0139RH+0.7681AF+0.0825TD,R²=0.8550 3.由穀層下方進風時稻穀溫度之變化依序由下層、中層到上層先後各有一降溫的主要時期,因此實行強制通風作業時,須俟上層稻穀經過主要降溫時期以後,才能確切發揮通風降溫的效果。 |
英文摘要 | The experiment is a simulation study of the effect of air temperature and humidity on the temperature transition of rough rice in bulk storage under forced aerating condition. The air temperature and humidity were simulated to represent typical weather condition in Taiwan by controlling an environmental test chamber. A small scale experimental circular bin loaded with rough rice of 13﹪moisture content was placed in the environmental test chamber for aeration study. The experimental treatments were determined by the random combination of four factors such as air flow rate (AF,0.25-1.66CMM/TON), air temperature (TA, 20-32℃), air humidity (RH,60-90﹪) and initial rice temperature (TG0, 35-40℃). The results obtained from the study showed that air flow rate and the initial temperature difference (TD) between rice and air before aeration were the dominating factors on the rice temperature descending rate (CR) during aeration. The more the air flow rate is the larger the rice temperature descending rate is. With respect to the effect of the temperature difference, the same result were found. However, no cooling effect was detected if the temperature difference was reduced to 2-3℃. From the outputs of stepwise regression procedures, the rice temperature descending rate can be expressed as function of air flow tate, initial temperature difference and air humidity. The regression equation listed below with R2=0.855 will validate the preceding CR=0.5368-0.0139RH+0.7681AF+0.0825TD,R²=0.8550 Since the results showed that at some hours after upward aeration the maximum rice temperature descending rate for each top, middle and bottom layer in the test bin were detected first at bottom layer, then at middle layer and finally at top layer, thus the aeration period must be long enough to let the rice temperature descending rate for top layer reach its maximum value. |
本系統中英文摘要資訊取自各篇刊載內容。