Browsing by Author "Viita, Tapani"

In Finland grain has to handle that seeds will stay in good condition in storage. The most common method of preservation is drying. 11 % of energy consumption in a grain growing chain is used in drying. EU has set the aim to achieve 9 % energy saving by year 2016 compared to average energy consumption in years 2001-2005. Ministry of agriculture and forestry has started energy program in agriculture, which aims to energy saving in agriculture. The aim of this study was to find out by computer simulation how to get the best energy efficiency in grain drying in different conditions. In the study was made a series of simulations to find out is different adjustments needed in different conditions. By sensitivity analysis was found out, which variable (condition or adjustment) affects most to the drying process. To find out reliability of the simulator energy consumption and drying time results was compared between simulation and real dryings in Viikki’s research farm. The best energy efficiency was achieved when high drying air temperature, fast grain circulation and small amount of air were used. The grain drying process is very sensitive to drying air temperature, moisture of grain and amount of air. The process is quite sensitive to density of grain and outside temperature. The simulator givesreliable results for energy consumption when grain moisture is more than 17% (w.b.) and for drying time when grain moisture is lower than 17 %. By adjusting grain drying process it is possible to save remarkable amount of energy. It is important to harvest and dry grain as good conditions as possible. Also isimportant to use isolation in dryer and maintain the burner.