ソ-ラ-ドライヤ-システムに関する基礎的研究-2-籾乾燥のための太陽熱コレクタ-シミュレ-ション
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概要
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The flat plate collector was produced for grain drying application. The performance tests were conducted with three type of air flow using various air flow rates. 1) Collector efficiency increases as air flow rates increase. Among three types of air flow, the order of efficiency is first, the reversed flow type, follwed by two-way flow type and the upper flow type. 2) The air temperature rise decrease as air flow rates increase. Especially in the reversed flow type, air temperature rise beyond 15℃ is attained when he average solar radiation is 1.2 cal/cm²min. Thus, the results indicate that the reversed flow type offers the best performance of the three types of air flow. (2) The mathematical model of the solar collector was developed as one part of solar grain drying simulation. Simulation results for the temperatures of the absorbing plate,the cover and the air showed reasonable agreement with the experimental data. It was demonstrated that this model was reasonably valid for simulation studies of rise drying. (3) Then, the simulation model was used to predict collector performance. The results were as follows: 1)Temperatures of the absorbing plate rise with an increase in the air flow rates and with a decrease in the collector area. 2) Air temperature is raised as air flow rates decrease and the collector area increases. 3) Collector efficiency increases with an increase in air flow rates. These conclusions agree well with the experimental results, showing that this model can be also used for the prediction of collector performance. (4) Simulation results showed the expression of the relationship between air flow rate and the energy collected to the each collection area. Thus, if air flow rate and collection area are assumed, energy collection can be calculated. Then, the relationship of energy collected and the collection area to air flow rates are shown in eqs.(21),(22). These can be used to predict the collection area when solar radiation is received in the drying season Aug.-Oct..
- 三重大学農学部の論文
- 1980-12-00