頁籤選單縮合
題 名 | 開放式畜舍內幅射量之模擬 |
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作 者 | 王鼎盛; | 書刊名 | 農業工程學報 |
卷 期 | 36:1 1990.03[民79.03] |
頁 次 | 頁78-86 |
分類號 | 437.12 |
關鍵詞 | 畜舍; 幅射量; 開放式; |
語 文 | 中文(Chinese) |
中文摘要 | 本省位居亞熱帶,屬於海島型氣候,夏季高溫多濕,縱觀本省之畜舍以開放型畜舍居多,家畜受外氣候及畜舍內之暑境環境影,使家畜承受熱緊迫導致飼養效率低降。畜舍內之暑熱環境受畜舍構造之影響甚鉅,故欲改善畜舍內之暑熱環境須從降低畜舍內輻射勢量著手。 影響畜舍內輻射勢量的因子有:(1)直達日射量、全天日射量、大氣幅射量、氣溫、絕對濕度及風速等氣象條件,(2)棟方位、棟長、棟寬、簷高、屋頂斜率及屋頂材料之熱傳性質等畜舍條件,及(3)地面輻射率,吸收率、蒸發比及土壤熱傳性質等地面條件。 本文以模擬推導舍內輻射熱量公式進而寫成電腦程式同時以實驗方法印證之,結果理論計算值比實測值稍大,但其曲線近似平行,其最大誤差僅為14.6%。故可採用本程試以預估畜舍內之輻射熱量。又由實測及理論推導得知畜舍內之輻射勢量以長波輻射熱量居多。 |
英文摘要 | Taiwan is an island located in subtropical area with high temperature and humidity in the summer. Most of the livestock buildings are developed as an open-type to remedy the heat stress and increase the productivity. The purpose of this research is to study the thermal radiation in the livestock buildings. There are three major factors affect heat radiation in the livestock buildings, namely (1) Weather conditions, such as direct solar radiation, total solar radiation, atmospheric radiation, temperature, absolute humidity, and wind velocity (2) Building conditions, such as orientation, length, width, over-hangs, roof-slope, and insulation material, and (3) Environmental conditions, ground surface heat absorption and reflection, the ratio of evaporation, and the heat transfer of soil......etc. In this research, a theoretical model has been developed for simulation of the variations of thermal radiation in the livestock buildings. Simulation results compared with the measured data show that the theoretical approach were slightly higher than that of the measured data with maximum error of 14.6%. Consequently, most of the heat radiation were generated by the longwave radiation in both of theoretical analysis and experimental results. |
本系統中英文摘要資訊取自各篇刊載內容。