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다중열원 열회수형 유동층 열교환기의 전열성능에 대한 실험적 연구
박상일(Sang-Il Park),고창복(Chang-Bok Ko),이영수(Young-Soo Lee) 대한설비공학회 2017 설비공학 논문집 Vol.29 No.2
The heat transfer performance of a multi-heat-source fluidized bed heat exchanger was analyzed. The fluidized bed heat exchanger examined in this study can simultaneously recover the waste heat from gas, water vapor, and hot water. The effects of waste water flow rate, gas flow rate, and cooling water flow rate were examined to find their experimental correlations with the heat transfer coefficient. A computer program using the correlations was developed in this study to predict the thermal performance of the fluidized bed heat exchanger. The calculated heat transfer rates of gas, water vapor, waste water, and cooling water were compared with the measured values. It was found that the error of the calculated values was less than 12%.
열매체유 유동층 열교환기의 전열성능에 대한 실험적 연구
박상일(Sang-il Park),고창복(Chang-Bok Ko),이영수(Young-Soo Lee) 대한설비공학회 2015 설비공학 논문집 Vol.27 No.3
The heat transfer performance of heating medium oil fluidized bed heat exchanger was measured. The operation variables were air flow rate, air inlet temperature, moisture content, water flow rate and water inlet temperature. The outside heat transfer coefficient was determined from the heat exchanger experiment and its experimental correlation was determined as a function of air velocity and viscosity of heating medium oil. Effect of viscosity was well agreed with the previous studies. Errors of the correlation equation was less than about 10% for outside heat transfer coefficient developed in this study when compared with the measured value. Hot water with the temperature greater than 77℃ could be produced by using the heating medium oil fluidized bed heat exchanger.
한 쌍의 2차원 반무한 사각전극이 유전성 유체에 작용하는 전기유체역학적 힘
이대근(Dae Keun Lee),최경빈(Kyong Bin Choi),동상근(Sang-Keun Dong),고창복(Chang-Bok Ko),정정열(Jung-Yeul Jung) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
When a couple of 2-dimensional, semi-infinite and rectangular electrodes is placed in a dielectric fluid and voltages applied to them are different, the electrohydrodynamic force acting on a dielectric fluid is analytically obtained. Since the physical domain is symmetric on the centerline and the applied potentials are anti-symmetric based on the mean value, the analysis on the half physical domain suffices for our purpose. The half domain can be conformally transformed to the infinite strip, where the Laplace equation on the electrical potential can be easily solved. When the results are applied to a micropump design, it can provide the body-force field and the hydrostatic pressure difference and help the optimal design of electrodes.
순산소 연소를 이용한 연소로 가열특성에 관한 실험적 연구
정유석(Yu-Seok Jeong),이은경(Eun-Kyung Lee),고창복(Chang-Bok Ko),노동순(Dong-Soon Noh),장병록(Byung-Lok Jang),한형기(Hyung-Kee Han) 한국연소학회 2006 KOSCOSYMPOSIUM논문집 Vol.- No.-
The oxy-fuel combustion heating characteristics is investigated experimentally by measuring furnace and steel temperature variations for batch type furnace simulator with a specially designed low NOx oxy-fuel burner. Economics of using oxy-fuel combustion is confirmed and, the furnace and steel temperature variations for different heating conditions are compared to deduce optimal heating control pattern for energy savings and rapid uniform heating. High CO₂ concentration (> 80-90%), low NOx (40ppm) and CO (<10ppm) are measured in the flue gas. Temperature differences (<30℃) inside the furnace and steel are reduced relatively by increasing the burner jet momentum.
전자장치 냉각을 위한 콘 형상 모세관을 이용한 모세관 펌프 루프
정정열(Jung-Yeul Jung),오후석(Hoo-Suk Oh),곽호영(Ho-Young Kwak),이대근(Dae Keun Lee),고창복(Chang-Bok Ko) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
A capillary pumped loop (CPL) was developed using cone shaped capillary structure for cooling electronic device. Cone shaped capillary structure was constructed by sand blast with 32 ㎛-diameter Al₂O₃ nano particles. The CPL fabricated was tested under various conditions such as different relative heights, fill ratios and heat fluxes. The operation conditions of CPL were varied depending on relative height, fill ratio and heat flux. With an allowable temperature of 55 ℃ on the evaporator surfaces, the CPL can handle a heat flux of about 0.8 W/㎝². Steady state operation condition was achieved within 10 minutes.
실증운전을 통한 배가스 열회수 히트펌프 시스템의 성능 분석
이승호(Seung-Ho Lee),이길봉(Gil-Bong Lee),이영수(Young-Soo Lee),박상일(Sang-Il Park),고창복(Chang-Bok Ko),백영진(Young-Jin Baik),이관수(Kwan-Soo Lee) 대한설비공학회 2014 설비공학 논문집 Vol.26 No.1
A field test of a 70 ㎾ heat pump system with flue gas heat recovery was performed by an experiment at the Korea Institute of Energy Research. The flue gas is exhausted from a 320 RT absorption chiller-heater in the heating season. Using this flue gas, source water of the heat pump is heated by a condensed-type heat exchanger in the chimney. The operating characteristics of the heat recovery heat pump system were analyzed. Based on the results of the experiments, operating maps were obtained, and an optimum operating range is suggested, in which the return and heat source water temperature are 51℃ and 31℃, respectively. Additionally, economic analysis of this system was conducted and about 50% energy cost savings can be expected in the heating season.
정정열(Jung-Yeul Jung),오후석(Hoo-Suk Oh),곽호영(Ho-Young Kwak),최경빈(Kyong-Bin Choi),고창복(Chang-Bok Ko) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
Convective heat transfers of a nanofluid in rectangular microchannel were measured. An integrated microsystem consisting of a single microchannel on one side and two localized heaters and seven polysilicon temperature sensors along the channel on the other side were fabricated. Aluminum dioxide (Al₂O₃) suspended nanofluids with various particle volume fractions were used in experiment to investigate the effect of the volume fraction of the nanoparticles to the convective heat transfer and fluid flow in microchannels. The convective heat transfer coefficient with Al₂O₃ suspended nanofluid was measured to be increased up to 30 % compared to the distilled water at a volume fraction of 1.8 vol.% without major friction loss. A new type of convective heat transfer correlation was proposed to correlate experimental data of heat transfer for nanofluids in microchannels.
배가스 열회수 히트펌프 시스템 실증을 통한 운전특성 분석
이승호(Seung-Ho Lee),이관수(Kwan-Soo Lee),이길봉(Gil-Bong Lee),이영수(Young-Soo Lee),박상일(Sang-Il Park),고창복(Chang-Bok Ko) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.6
The performance test of the 15 RT grade heat pump system with flue gas heat recovery was performed in the Korea Institute of Energy Research. The flue gas is exhausted from the 320 RT absorbtion chiller-heater in winter season. Using this flue gas, source water is heated by condensed type heat exchanger in by-pass. And the operating characteristics of the heat recovery heat pump system were analyzed. Based on the results of the experiments, operating maps were obtained and optimum operating range was suggested where the return and heat source water temperature are 51℃ and 31℃, respectively.