실험실습용 국소배기 기초실험장치의 개발

To enhance educational effect for exhaust ventilation system , more instructive educational engineering such as experimental system should be needed. This study was performed to 1) manufacture the basic experimental system for local exhaust ventilation, 2) experiment with this system and 3) develop methodology of exhaust ventilation education. With this system , three press ures ( static pressure(SP), veloci ty pressure(VP) and total pressure(TP)) were measured and illustrated and the graphic shapes agreed to theoretical ones relatively. Entry loss factor (F_h) of each hood was found to be different with hood shape, duct velocity and flow rate. This result implies that precise F_h should be determined case by case and a industrial hygienist should not be dependent on the existing values. Pressure loss using velocity pressure method and characterist ics of air movement near hoods using fume were grasped with this system . But larger system should be recommended to produce more precise experimental results.