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FEATURES OF PRESSURES IN THE PIPE FITTED BETWEEN TWO SNUBBERS IN HYDROGEN COMPRESSING SYSTEM
Mohammad Rahman(라흐만),Kyeonghwan Lee(이경환),Suprianto Wobowo(위보워),Jusik Woo(우주식),Hanshik Chung(정효민),i Hk Chung(정한식) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Compressing system is one of the most important processes in hydrogen gas handling: production, storage, distribution until using. High pulsation waveforms produced during hydrogen compression can be reduced by employing snubber in the system. There are some pipes to flow hydrogen between two snubbers. An experiment has been conducted to investigate the features of pressure in the pipe placed between snubbers in reciprocating compression system. In measuring amplitude FFT was done and pressure RMS values at input and output of one the pipe using data for 10, 20, 30, 50 and 60 ㎐ motor frequency of compressor operation. The pressure pulsation reductions are varied from 16.415~35.151% and corresponding pressure losses 0.007~0.759%.
라흐만(Mohammad-Shiddiqur Rahman),이경환(Gyeong-Hwan Lee),이광성(Kwang-Sung Lee),정한식(Han-Shik Chung),정효민(Hyo-Min Jeong) 대한설비공학회 2009 대한설비공학회 학술발표대회논문집 Vol.2009 No.-
Renewability and pollutant free energy source makes hydrogen energy popular rapidly. Hydrogen gas pressure which is after passing through reciprocating compressor part has high pulsation wave form. A unit, snubber is used as compressor components to reduce the harmful pulsation waveform and to remove the impurities in the hydrogen gas. An experiment has been conducted to investigate the pulsation reduction performance of a steel pipe used in snubber system. The amplitude of pressure reduction were varied from 0.054 ~ 0.321 ㎪ for 10 hz to 60 hz motor speed. Compressor operation by motor with 10 to 60 hz were resulted in reduction of pressure pulsation from 16.415% to 35.151%. Pressure losses were varied from 0.001% ~ 0.759%, and pressure drop per centimeter of the steel pipe were varied from 0.0160 ~ 16.031 ㎩.
태양열 온수 시스템에서 기포펌프와 전기펌프의 성능평가 및 비교분석
이광성(Kwangsung Lee),이설송(Li Xuesong),라흐만(Mohammad Shiddiqur Rahman),정효민(Hyomin Jeong),정한식(Hanshik Chung) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
This study performance evaluation and comparative analysis on the bubble pump and electric pump was conducted. The experimental apparatus were bubble pump, electric pump, solar collector and heat exchanger. In the electric pump set up to the solar heating system yields 5270 ㎉ of heat in the storage tank whereas bubble pump setting yields only 2080 ㎉. Bubble pump yields 39.50% energy that of electric pump from solar heating technique. The flow rate for electric pump set up experiment varies from 0.5 to 3.5 ℓ/min with mean 1.5 ℓ/min. But, in case of bubble pump it is recorded as 0.5 ℓ/min on average with 0 to 0.30 ℓ/min variation. The storage tank temperature raises up to 15℃ and 5℃ for electric and bubble pump, respectively.