열교환기설계에 관한 불결계수의 효과

송희열 대한설비공학회 1976 설비저널 Vol.5 No.3

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.

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.

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.

주택 및 소형건물을 위한 공기조화 장치 및 부품의 효율개선

송희열 대한설비공학회 1976 설비저널 Vol.5 No.2

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.

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.

低溫相變化에너지 저장시스템의 溶融特性에 關한 硏究

閔兵烈,宋熙烈 建國大學校 附設 産業技術硏究所 1988 논문집 Vol.13 No.-

This is concerned with study on the melting heat transfer characteristics of low temperature phase change energy storage system. The temperatures of PCM in radial direction, tube wall and fluid are measured by the change of fluid inlet temperature and mass flowrate. Experimental results are compared with the theory to investigate the appropriateness of unsteady-state one dimensional heat conduction equation of PCM and dependences of total melting time on Stefan numbers and Biot numbers are investigated. Experimental results ar within 7% agreement with the theory and show that heat transmission enthalpy model is appropriate for analysis of melting heat transfer characteristics. The total melting Fourier number is correlated with Biot number and Stefan number as following. ?? It is considered to be reasonable that high Stefan number with high heat transfer rate is advantageous for the shortening of heat absorption time in PCM melting system.

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