Hyppo를 이용한 Rolling Cylinder의 용융특성에 관한 실험적 연구

송희열,김동석 건국대학교 산업기술연구원 1997 건국기술연구논문지 Vol.22 No.-

This is concerned with the study on the thermal performance of PCM mixture and melting effects of PCM cylinder where the air flows outside. Hypo is used as PCM and Na₂B₄O7·7H₂O or Na₂SO₄as nucleating agent. The temperatures of PCM in axial direction, cylinder wall, air inlet al and outlet were measured for the various air velocity and rolling speed of cylinder. Experiment results show that optimum condition of PCM mixures is 95 wt% of Hypo containing 1.5 wt% of Na₂SO₄as nucleating agent. Melting effects have excellent increase with rolling. The melting time of PCM with rolling is 1/9~1/2 times shorter than that of PCM without rolling. The effect of air velocity on melting is remarkable than that of rolling. The melting time of PCM is expressed as following correlations with respect to air inlet velocity and rolling speed of PCM cylinder.

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.

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.

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.

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.

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.

自然循環形 太陽熱溫水加熱器의 性能

宋熙烈 건국대학교 1983 學術誌 Vol.27 No.2

本 硏究는 自然循環形 太陽熱溫水加熱器의 性能實驗으로, 加熱器의 效率을 항상시키기 위하여 알루미늄 로올 본드 溫水加熱器의 熱傳達 모델을 設計하여 集熱器 및 저장탱크 내의 물의 溫度分布를 實驗的으로 考察하여 加熱器의 集熱性能을 評價하였다. 實驗結果, 알루미늄 로올 본드 平板型 集熱器의 熱傳達 모델은 熱特性을 해석하기에 충분하고, 유리덮개 板을 一枚 使用時, 集熱效率은 45% 정도로 50℃ 이상의 溫水를 얻을 수 있다. 集熱器 上部 헤더와 저장탱크 下部間의 높이차는 集熱效率面에서 볼 때 60cm 정도가 바람직하다. The performance of solar water heater with natural circulation was tested. Heat transmission model for aluminium roll bond type was designed and fabricated to increase the efficiency of solar water heater. The collection performance was evaluated by the temperature distribution of collector and storage tank. Experimental results show that heat transmission model is sufficient for the analysis of the thermal characteristics of solar water heater. Aluminium roll bond type solar water heater supplies hot water above 50 degree centigrade with an overall efficiency of 45 percent. The height between the collector top and the tank bottom is desired to be about 60 centimeters in the collection efficiency.

효소 촉매를 이용한 저온 유지분해의 효용성에 관한 연구

송희열,김인원,김기선 건국대학교 산업기술연구원 1996 건국기술연구논문지 Vol.21 No.-

The optimum operating conditions for the decomposition of fat and oil by enzyme hydrolysis was studied. The effect of the concentration of enzyme, reaction temperature and agitation speed on the neutralization value and decomposition efficiency were analyzed in a batch-type bioreactor. The washing effect of EMPA was measured as well. The highest decomposition efficiency of 95% was obtained at the operating condition of 0.05wt% of enzyme, reactor temperature of 50℃ and agitation speed of 200rpm. EMPA111 and EMPA117 also enhanced the washing effect of soup.

PCM Rolling Cylinder의 고체화특성

송희열,김석현 건국대학교 산업기술연구원 1998 건국기술연구논문지 Vol.23 No.-

In this study, the solidification heat transfer characteristics of horizontal PCM rolling cylinder where the coolant flows outside is investigated. The temperature of PCM in axial direction, cylinder wall, coolant inlet and outlet were measured for the various experimental conditions of coolant velocity and rolling speed of PCM cylinder. The solidification effect of PCM by coolant velocity is relatively excellent than that by rolling speed. The solidification time of PCM with rolling is 1/4~1/2 times shorter than that of PCM without rolling. The solidification time of PCM is correlated with the coolant with the coolant velocity and rolling speed of PCM cylinder as following. τs=3.287 x 10³(v)0.68(sc)0.46

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.