풍동장치를 이용한 열선풍소계의 보정 및 실태 평가

Calibration and Performance Test of Hot-wire Anemometers by Using a Calibration Wind Tunnel

  • 하현철 (한국산업안전공단 산업안전보건연구원) ;
  • 김태형 (창원대학교 환경공학과) ;
  • 김은아 (한국산업안전공단 산업안전보건연구원) ;
  • 김종철 (창원대학교 환경공학과) ;
  • 오정룡 (한국산업안전공단 산업안전보건연구원) ;
  • 정호근 (한국산업안전공단 산업안전보건연구원)
  • Ha, Hyun-Chul (Industrial Safety & Health Research Institute Korea Industrial Safety Corporation) ;
  • Kim, Tae-Hyeung (Department of Environmental Engineering, Changwon National University) ;
  • Kim, Eun-A (Industrial Safety & Health Research Institute Korea Industrial Safety Corporation) ;
  • Kim, Jong-Chul (Department of Environmental Engineering, Changwon National University) ;
  • Oh, Jung-Ryng (Industrial Safety & Health Research Institute Korea Industrial Safety Corporation) ;
  • Jung, Ho-Keun (Industrial Safety & Health Research Institute Korea Industrial Safety Corporation)
  • 발행 : 1999.11.30

초록

Hot-wire anemometers are most commonly used in measuring hood capture velocities due to their accuracy and convenience. But it was questionable that the anemometers being used in the field are accurate enough for the purpose of measurements. To answer this ques tion, a calibration wind tunnel was newly devised and tested. Subsequently, 53 hot-wire anemometers being currently used in the field were tested to evaluate the accuracy of anemometers. The average error was 16.93% while the average errors in the low (0.5~5m/s) and high (5~20m/s) velocity range were 17.40% and 16.45%, respectively. Most of anemometers underestimated the true velocities. It might be due to the contamination of hot-wire, resulting in the slow heat transfer between the sensor and air flow. Astonishingly, 16 of 53 anemometers were out of order due to the malfunctioning of zero adjustment control, power supply, display panel and sensor. It is desirable to calibrate periodically and clean the sensor after using in the dirty environment.

키워드