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태양열에 의한 냉방 및 난방시스템의 성능향상(Ⅱ) - 태양열을 이용한 흡수식 냉동기의 성능 -
박문수(M.S.Park),김무근(M.G.Kim),김효경(H.K.Kim),노승탁(S.T.Ro) 대한설비공학회 1989 설비공학 논문집 Vol.1 No.1
The purpose of this study is to obtain the dynamic characteristics of an absorption refrigerator powered by solar energy by experiments. Since the absorption refrigerator power by solar energy should have the characteristics which is suitable for the intermittence and rarity of solar energy, not only the characteristics of the steady state operations but also the partial load and the transient operations should be considered. The minimum available temperature of the storage tank should be known, and the absorption refrigerator can be suitably selected for air-conditioning systems. In this study, the experimental data of the transient state for on-off and warming-up operations has been obtained. Also the experiments are performed which test the minimum available temperature of the storage tank. The results show that it takes 1 hour to get to the steady state of the absorption refrigerator, and the minimum available temperature of the storage tank is about 68℃, and show that in the partial load operations the performance of the absorption refrigerator is improved by applying the modified control method to on-off operations.
심규진(K. J. Shim),이중섭(C. S. Yi),악바르 완다(Wanda Ali Akbar),정한식(H. S. Chung),정효민(H. M. Jeong),김무근(M. G. Kim) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
Nowadays, study about hydrogen fuel which consist of hydrogen extraction and reforming processes, fuel cell equipment, and receptacle are flourishing all over the world. Currently, Korea hydrogen station is still underdeveloping. And also the most important part which is hydrogen compressor has not been developed. Snubber is one of the important parts in hydrogen compressing system. It is installed before and after reciprocating hydrogen compressor. Snubber has two functions. One is making down pulsation waveform. Because pressure hydrogen gas where is after passing through reciprocation compressor part has high pulsation waveform, so this waveform has to decline. And the other function is precipitating alien substances to outside. Normally, even if 99.99% hydrogen gas is still containing alien substance. Buffer is set up inside snubber and the waveform will hit buffer. This snubber study uses CFD analysis, then it compares between with-buffer snubber and without-buffer snubber.