HCMFM에 의한 자동차용 부품재료의 방식특성

송희열 건국대학교 산업기술연구원 2003 건국기술연구논문지 Vol.28 No.-

This study is concerned with the experimental effects of HCMFM(Highly Concentrated Methanol Fuel Mixture) and the anti-corrosion additives on the vehicle component materials. Galvanized iron, SBR and viton were used as test materials. Experiments were carried out under the conditions of 25℃ and 10 rpm submerging test specimens into the HCMFM and the anti-corrosion additive containing HCMFM for 50 days. Galvanized iron and viton showed anti-corrosiveness against M100 only without the change of exterior view and decrease of weight except M100A, M85, M85A and gasoline with local corrosion or decrease of luster. SBR was corroded against M100, M85 and gasoline with local corrosion, M100A and M85A with decolorization. Hexamethylenetetramine showed the significant anti-corrosion effects on galvanized iron against M100A, viton against M100A and M85A. Sebacic acid showed the significant anti-corrosion effects on SBR against M100A and adipic acid on SBR against M100A and M85A. Triethylenetetramine showed insignificant anti-corrosion effects on all the test specimens against M100A and M85A with homogeneous, local corrosion or swelling. DGOl-100 seems to be suitable anti-corrosion additive on galvanized iron against M85A, SBR against M85A, viton against M100A and M85A except galvanized iron against M100A and SBR against M100A with rust or local corrosion.

Phase Change Thermal Storage 시스템의 고체화 특성에 관한 실험적 연구

송희열 건국대학교 산업기술연구원 1995 건국기술연구논문지 Vol.20 No.-

This study is concerned with the solidification heat transfer characteristics of phase change thermal energy storage system. The temperature of PCM cylinder wall and coolant are measured by the change of coolant inlet temperature and mass flowrate. temperature variation in PCM cylinder, solidification time of PCM and heat flux are investigated experimentally for the various coolant inlet temperature and mass flowrate. The solidification time of PCM increases with the increase of coolant inlet temperature with linear slope of 0.929 and decreases with the increases of mass flowrate with linear slope of 0.567 in log-log coordinate as follows. ?? The effect of coolant inlet temperature on the solidification time of PCM has a tendency to be higher than that of coolant mass flowrate. Higher coolant inlet temperature and low mass flowrate are considered to be advantageous for steady discharge of heat for space heating in PCM energy solidification system.

DSP를 함유한 Cylindrical Annulus Heat Storage System의 용융특성에 관한 연구

송희열 건국대학교 산업기술연구원 1999 건국기술연구논문지 Vol.24 No.-

The objective of this study is concerned with the thermal performance of PCM mixture and melting heat transfer characteristics of vertical annulus solar energy storage system utilizing the DSP. Experimental nucleating ability of K₂SO₄,Cu powder, TiO₂ as nucleating agent for DSP are carried out. The temperature of PCM, tube wall and heat transfer fluid are measured with variation of fluid inlet temperature and fluid mass flowrate. Temperature variation of PCM, melting time of PCM and heat flux are investigated experimentally. Experimental result shows that 4 wt% of Cu powder, 3 wt% of TiO₂ have excellent nucleating ability for DSP. The melting time of PCM decreases linearly with the increase of fluid inlet temperature with the slope of 1.961 and increase of fluid mass flowrate with the slope of 0.357 in log-log coordinate as following. ?? Under this experimental conditions, the effect of fluid inlet temperature on the melting time of PCM is relatively higher than that of fluid mass flowrate.

열교환기설계에 관한 불결계수의 효과

송희열 대한설비공학회 1976 설비저널 Vol.5 No.3

무기성 PCM 혼합물에 의한 에너지저장용기재료의 방식특성

송희열,성현숙 건국대학교 산업기술연구원 2000 건국기술연구논문지 Vol.25 No.-

This is the experimental study on the effects of PCM (Phase Change Material) mixture and anti-corrosion additives on the metal for energy storage container. Aluminum, copper, steel, and SUS 304 were used as metal materials. Experiments were carried out at constant temperature above the melting point of the corresponding PCM submerging test metal specimens into the PCM mixture and anti-corrosion additives contained PCM mixture for 30 days. Aluminum showed the significant corrosion against all the PCM mixture and copper was not corroded against DSP only as the PCM mixture. Steel was corroded against GS with rust, ST with black color and not corroded against DSP, SA. SUS 304 seems to be corrosion-resistant material due to the anti-corrosiveness and no decrease of weight. Hexamethylene tetramine as anti-corrosion additive showed unsuitable anti-corrosion effects on aluminum against all the PCM mixture, but other additives showed suitable one against ST only, Mono quarternary ammonium chloride seems to be suitable additive for the anti-corrosion on copper against GS, DSP, SA and especially all the anti-corrosion effects on copper against DSP. N-methymorpholine and adipic acid showed insignificant anti-corrosion effects against PCM mixture except DSP and the other additives showed unsuitable anti-corrosion effects. All the anti-corrosion additives showed good anti-corrosion effects on SUS 304.

주택 및 소형건물을 위한 공기조화 장치 및 부품의 효율개선

송희열 대한설비공학회 1976 설비저널 Vol.5 No.2

DSP를 함유한 Thermal Energy Storage System의 고체화 특성

송희열 건국대학교 산업기술연구원 2001 건국기술연구논문지 Vol.26 No.-

This study is concerned with the solidification heat transfer characteristics of thermal energy storage system containing DSP as PCM. The temperature of PCM, tube wall and coolant were measured for the various inlet temperature and mass flowrate of coolant. The experimental investigations for the temperature variation of DSP, solidification time of DSP in DSP solidification system and heat flux were carried. The solidification time of DSP increases linearly with the Increase of coolant inlet temperature with the slope of 0.443 and decreases with the increase of coolant mass flowrate with the linear slope of 0.397 in log-log coordinate as following empirical design equation. τs = 16.55TC0.443 □-0.397 Under this experimental conditions, higher inlet temperature and lower mass flowrate of coolant are considered to be desirable to make steady extraction of heat stored from DSP solidification system for space heating.

Cellulose Acetate 막을 통한 염수투과 특성에 관한 실험연구

신영호,민병렬,송희열 연세대학교 산업기술연구소 1988 논문집 Vol.20 No.2

In this study, the transport phenomena of solvent and solute across the membrane are investigated utilizing three kinds of Cellulose Acetate R.O. membranes. Experimental results show that total volume flux(Jv) and rejection coefficient (R) increase when pressure difference across the membrane increases and feed concentration decreases. Therefore, higher efficiency of desalination by R.O. can be achieved by utilizing higher pressure differences across the membrane. According to R.O. data, increase in feed concentration causes increase of solute permeability, ω and decrease of pure water permeability, Lp. The values of ω and Lp increase as pore size of the membrane becomes larger. The reflection coefficient, σof SEPA-97, SEPA-92, SEPA-89 are 0.91, 0.90, 0.53 respectively. Most of R.O. data indicate the linear relationship between inverse of rejection coefficient and inverse of total volume flux through the membrane, which is derived from Kedem-Katchalsky model.

The Institute of Industrial Science & Technology Kon-Kuk University

송희열,김화중,유인상 建國大學校 附設 産業技術硏究所 1993 논문집 Vol.18 No.-

The objectives of this paper was to study was to study the effects of highly concentrated methanol fuel mixture(HCMFM) and the anti-corrosion additives on the vehicle component materials. The anti-corrosion experiments were carried out at 25℃ submerging several different materials used for vehicle component into the HCMFM and the anti-corrosion additive containing fuel mixture for 100 and 70 days, respectively. The experimental results showed that among several different materials tested, anti-corrosion effect against HCMFM was highly significant for all the materials except cloth-rubber composite tube. However, it was found that if methanol was not 100% pure, all tested materials except polymeric material were significantly corroded. It may be ascribed to organic acid present as an impurity. In case of using anti-corrosion additives, several different additives except triamine showed significant anti-corrosion effects. In addition, sebasic acid seems to be detrimental to copper because it changed the color of copper to blue. In general, teflon was the most corrosion-resistant material and a commercial anti-corrosion agent, DGOI-100 was comparatively superior as an anti-corrosion additive.

PCM Heat Exchanger에서 PCM의 용융특성

宋熙烈,崔一榮 건국대학교 산업기술연구원 1994 건국기술연구논문지 Vol.19 No.-

The objective of this paper was to study the melting heat transfer characteristics when the heat transfer fluid flows outside the vertical annulus PCM cylinder. The temperatures of PCM, cylinder wall and transfer fluid were measured for the various inlet fluid temperatures and mass flowrates. Correlations between the melting time and heat flux were discussed for the heat absorption of melting PCM. The melting time of PCM is inversely proportional to the inlet fluid temperature and mass flowrate with the corresponding slopes of 4.15 and 0.51 respectively in log-log courdinates as follows. ?? = ?????1???? The effect of inlet fluid temperature on the melting time is relatively remarkable than that of fluid mass flowrate.