실험실습용 국소배기 기초실험장치의 개발

Development of Basic Local Exhaust Ventilation System forExperimental Education

To enhance educational effect for exhaust ventilation system, more instructive educational engineering such as experimentalsystem should be needed. This study was performed to 1) manufacture the basic experimental system for localexhaust ventilation, 2) experiment with this system and 3) develop methodology of exhaust ventilation education. Withthis system, three pressures (static pressure(SP), velocity pressure(VP) and total pressure(TP)) were measured and illustratedand the graphic shapes agreed to theoretical ones relatively. Entry loss factor (Fh) of each hood was found to bedifferent with hood shape, duct velocity and flow rate. This result implies that precise Fh should be determined case bycase and a industrial hygienist should not be dependent on the existing values. Pressure loss using velocity pressuremethod and characteristics of air movement near hoods using fume were grasped with this system. But larger systemshould be recommended to produce more precise experimental results.