열풍건조기의 건조성능과 공기령의 상관관계 연구

In order to improve the drying performance of a hot air dryer, it is advantageous to make the hot, dry air reach the drying material rapidly. The time the air takes to reach the material depends upon the location and velocity of the inlet air and location of the material. The arrival time of the air and drying performance of 15 internal locations of a 1 HP geothermal source heat pump-type hot air dryer is calculated through computational simulation and is verified with measurement. For the arrival time calculation, the age of air concept using a step-up method, which analyzes the concentration variation with respect to time, is applied for numerical simulation. For the experiment, evaporation of 40 g water contained in a chalet was measured for 15 locations during the one hour operation of a dryer. The results show that the age of the air and drying performance are strongly correlated and as the age of the air is shortened the drying performance gets better.