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.

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

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.

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.

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.

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.

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.

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.

Failure Cost와 Life Cycle Cost를 고려한 연속시스템에 대한 최적 장치 선택에 관한 연구

진상화,김용하,송희열,여영구,김인원 한국안전학회 2004 한국안전학회지 Vol.19 No.4

In this study, the required life cycle cost is evaluated in consideration of the equipment's availability during its life cycle. In order to meet the maximum availability required by the process, the failure cost and life cycle cost is assessed, The optimal equipment selection method is presented according to the analysis of the failure cost and life cycle cost. For the systems in which equipments are connected serially, the optimal equipments are selected by minimizing the life cycle cost and satisfying the required system availability goal. In addition, the selection methods and life cycle cost are analyzed according to the cost variation of the equipment. By using the life cycle evaluation procedure, the failure cost and maintenance cost needed during the life cycle of the equipment can be presented.

平板形太陽熱集熱器의 性能에 關한 理論的 硏究

宋熙烈 건국대학교 부설 산업기술연구소 1985 논문집 Vol.10 No.-

本 硏究는 太陽熱集熱器의 性能에 關한 몇가지 重要한 因子를 解釋하여 이의 새로운 評價方法을 提示하였는 바, 이 方法을 利用하여 여러 파라미터가 集熱器의 效率에 미치는 영향을 調査檢討하였다. 透明커버의 消滅係數와 風速이 一定할 때, 集熱器 效率은 集熱板의 吸收率 增加에 따라 증가되었고, 集熱板吸收率變化가 集熱器 效率變化에 미치는 영향은 2~3%이다. 集熱板吸收率과 風速이 一定할 때, 集熱基效率은 透明커버의 소멸계수의 증가에 따라 相對的으로 감소하였으며 이때의 效率變化는 6~7%이다. 뿐만아니라 集熱板吸收率과 透明커버의 소멸계수가 一定할 때 集熱器效率은 風速이 증가함에 따라 相對的으로 감소하였고, 風速變化에 따른 集熱器效率은 6~7%의 變化를 보이고 있다. 透明커버의 소멸계수 및 風速變化가 集熱器效率에 미치는 영향은 集熱板의 吸收率變化에 의한 경우보다 相對的으로 현저하였다. 커버와 外氣, 集熱板과 커버, 集熱板과 流體間의 對流傳熱係數에 關한 계속적인 硏究가 행해져야 할 것으로 사료된다. This study is concerned with the analysis of several important parameters and presentation of its new evaluation method on the performance of flat-plate solar collector. The influence of these parameters on efficiency was investigated. When the extinction coeffient of transparent cover and wind velocity are cantant, collector efficiency was increased with the increase of absorptance of absorber plate and influence of these variations on efficiency is about 2~3 percent. The absorptance of absorber plate and dwind velocity contant, efficiency was relatively decreased with the increase of extinction coefficient and efficiency variation is 6~7 percent. Besides all other conditions being equal, efficiency was relatively decreased with the increase of wind velocity and wind velocity variation effect on efficiency 6~7 percent. The influence of extinction coefficient and wind velocity variation on efficiency is relatively remarrkable than that of absorptance. Further investigations on convection coefficients between cover and ambient, plate and cover, plate and fluid are desired to be carried out.