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Characteristic test methods of the thermal mass flow controller
최용문,최해만,이생희,강웅 대한기계학회 2014 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.28 No.3
A thermal mass flow controller (MFC) is used to measure and control the mass flow of gases in industrial fields, for example, in thesemiconductor manufacturing process. In the present study, the characteristic test methods for rangeability, linearity, reproducibility,effects of temperature and valve response time are proposed to evaluate the performance of the MFC. Three commercial MFC productsare tested by gas flow standard system and a sonic nozzle to verify the effectiveness of the proposed test methods. Linearity tests showthat reading errors before and after adjustment must be provided to consumers. Reproducibility tests were conducted to evaluate theshort-term stability of MFCs. Temperature effect tests represent that deviation due to temperature effect of MFC body is larger than thatof gas flowing. Three MFCs show different response characteristics according to direction of flow rate change in response time test bymeasuring the flow setpoint, flow output signal, and real flow rate.
강 웅,신진우,이생희,윤병로,백운봉 한국수소및신에너지학회 2022 한국수소 및 신에너지학회논문집 Vol.33 No.6
Hydrogen fuel cell electric vehicles are typically refueled at a wide range of temperatures (-40°C to 85°C) in the hydrogen refueling station in accordance with the worldwide accepted standard. Currently, there is no traceable method by which to verify and calibrate the hydrogen flowmeters to be used at hydrogen refueling stations except for a water calibration process as a conventional method. KRISS hydrogen field test standard based on the gravimetric principle was developed to verify the measurement accuracy of the mass flowmeter to be used at hydrogen refueling stations for the first time in Korea.
LNG 선박용 spring load 안전방출밸브의 유량 성능시험
박경암(Kyung-Am Park),이생희(Saeng-Hee Lee),김경권(Keng-Kuen Kim),고장훈(Jang-Hoon Goh) 한국유체기계학회 2006 유체기계 연구개발 발표회 논문집 Vol.- No.-
Many LNG ships will be constructed in Korea and the demand of safety valves is increasing. The most important performance of the developed safety relief vales for LNG ship is flow capacity. Flow capacity tests for 8 sizes of developed safety valves were conducted in the high pressure gas flow standard system in KRISS. The initial spring force adjustment was important for setting pressure of the safety valve. The procedure of data reduction and evaluation of the safety valve performance are suggested. This procedure was approved by French Bureau Veritas and Lloyd’s Register.