The influence of ventilation network structure on heat and moisture transfer of grain pile
Improving the grain storage ventilation is a crucial method for ensuring food security and sustainable storage.This paper choose a novel ventilation network based on a Gui-shaped air duct and vertical riser as research object using numerical simulation to exam the influences of various riser heights and ventilation rates per ton of grain on the temperature and moisture fields within the grain pile.The optimal structure and operation parameters are also determined.The results show that the rate of decrease in average temperature and moisture is proportional to the riser height dueing the early stage of ventilation,but becomes inversely proportional during the later stage.The higher the ventilation volume,the better the cooling effect.But at the same time,it will intensify moisture absorption in grain piles near the ventilation ducts.After comprehensive analysis,the optimal structure is identified as a vertical riser height of 1.5m,with a recommended ventilation volume of 5 m3/(h·t)per ton of grain.
numerical simulationstructure optimizationventilation per ton of grainventilation effect
万方数据
维普
