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곽승범(Seung-Bum Kwak),최낙삼(Nak-Sam Choi),신세문(Sei-Moon Shin),신외기(Wae-Gi Shin) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.10
Rubber hoses for automobile radiators are apt to be degraded and thus failed due to the influence of contacting stresses of air and coolant liquid under thermal and mechanical loadings. The aging behaviors of the skin part of the hoses due to thermo-oxidative and electro-chemical stresses were experimentally analyzed. Through the thermo-oxidative aging test, it was shown that the surface hardness IRHD(International Rubber Hardness Degrees) of the rubber increased with a considerable reduction of failure strain as the aging time and temperature increased. On account of the penetration of coolant liquid into the skin part influenced by the electro-chemical degradation(ECD) test the weight of the rubber hose increased, whereas their failure strain and IRHD hardness decreased. The hardness of the hose in the side of the negative pole was the most deteriorated at the test site of the hose skin just below the coolant surface.
화성열병합발전소 DH economizer의 성능개선 연구
변수영(Su-Young Byun),곽승신(Seung-Shin Kwak),백광열(Kwang-Youl Back),양균식(Kyoun Sic Yang) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
Theoretical performance analysis on DH Economizer in Hwasung CHP was conducted. At first, current operating conditons and logics were examined, and two methods to improve the heat exchange performance were reviewed. One is to change the contorl logic, and the other is to increase heat exchanger capacity. ɛ-NTU analysis was performed to verify the feasibility of two methods. It was found that both methods are effective way to increase heat recovery of DH Economizer in Hwasung CHP.