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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of Energy Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Energy Engineering
Editor in Chief :
Volume & Issues
Volume 10, Issue 4 - Nov 2001
Volume 10, Issue 3 - Sep 2001
Volume 10, Issue 2 - Feb 2001
Volume 10, Issue 1 - Feb 2001
Selecting the target year
Development of a Single Phase Shell-and-Tube Type Heat Exchanger Thermal Design Code Based on Stream Analysis
Journal of Energy Engineering, volume 10, issue 4, 2001, Pages 299~309
This shell-and-tube heat exchanger design code based on stream analysis method was developed to design accurate and advanced heat exchangers. Several geometry factors which affect the heat exchanger design was explained. Stream analysis method to calculate flow fraction of each stream and heat exchanger design flow chart was introduced. Performance of developed simulation code was compared with Delaware09, Delaware10, DongHwa and ANL experimental data. The statistical results of performance evaluation indicated that most data points are predicted within
30%. But the pressure loss was over predicted.
A Study on the Instantaneous Voltage Drop Compensator through the Series Voltage Injection
Journal of Energy Engineering, volume 10, issue 4, 2001, Pages 310~317
The instantaneous voltage drop is occurred when the fault is happened on the nearby feeders. The instantaneous voltage drop is continued during relatively short period. But, the effect of it can be very severe to some sensitive devices. That is, it can be the reason of restart or malfunction of some devices. And these phenomenons can cause the enormous economical damage and shorten the lifetime of the devices. In this paper the device which can compensate the instantaneous voltage drop, is studied. The device injects the voltage to the power system through the series transformer. The validity of the proposed algorithm using peak detection method is verified through the computer simulation and experiments.
Development of 1MW Organic Rankine Cycle System
Journal of Energy Engineering, volume 10, issue 4, 2001, Pages 318~326
To enhance thermal efficiency of thermal facility through recovery of low and medium temperature waste heat, 1 MW organic Rankine cycle system was designed and developed. The exhaust gases of 175
at two 100 MW power plants in pohang steel works were selected as the representative of low and medium temperature waste heat in industrial process for the heat source of the organic Rankine cycle system. HCFC-123, a kind of harmless refrigerant, was chosen as the working fluid for Rankine cycle. The organic Rankine cycle system with selected exhaust gases and working fluid was designed and constructed. From the operation, it was confirmed that the organic Rankine cycle system is available for low and medium temperature waste heat recovery in industrial process. The optimum operating manuals, such as heat-up of hot water, turbine start-up, and the process of electric power generation, were derived. However, electric power generated was not 1 MW as designed but only 670 kW. It is due to deficiency of pump capacity for supply of HCFC-123. So it is necessary to increase the pump capacity or to decrease the pressure loss in pipe for more improved HCFC-123 supply.
An Application Study on the Actual Site for Using Waste Heat
Journal of Energy Engineering, volume 10, issue 4, 2001, Pages 327~334
Heat is wasted by unconcern in industrial complex. This paper presented for using waste heat, which investigated step by step from searching waste heat to starting construction before and directly applied for the using waste heat in the actual site. Especially, using heat is assessed by investigation of heat supply and demand. Design of heat transportation system was made base on analysis of heat balance between demand and supply, which was analyzed by economical efficiency and property. Payback-period on investment was 1,909 years that was comparatively a short period of time in assessment.
Experimental Study on the Blade Excitation Frequency for the Natural Frequence of Centrifugal Pump Piping Systems
Journal of Energy Engineering, volume 10, issue 4, 2001, Pages 335~341
Pressure pulsations generated by the blade-tongue interaction induce vibration of the piping systems and the structure connected to pumps, resulting in the severe noise and fatigue fracture. Experiments were made on the natural frequencies of liquid columns in piping systems with a single suction, single stage, centrifugal volute pump. Experimental results show that the natural frequencies of the liquid columns in the pump piping systems depend on the dimensions of the pipes and the impeller shapes, and are not affected substantially by the rate of discharge and the rotating speed of the pump.
Feasibility Study of the Decay Heat Removal Capability Using the Concept of a Thermosyphon in the Liquid Metal Reactor
Kim, Yeon-Sik ; Sim, Yoon-Sub ; Kim, Eui-Kwang ;
Journal of Energy Engineering, volume 10, issue 4, 2001, Pages 342~348
A new design concept for a decay heat removal system in a liquid metal reactor is proposed. The new design utilizes a thermosyphon to enhance the heat removal capacity and its heat transfer characteristics are analyzed against the current PSDRS (Passive Safety Decay heat Removal System) in the KAL IMER (Korea Advanced LIquid MEtal Reactor) design. The preliminary analysis results show that the new design with a thermosyphon yields substantial increase of 20∼40% in the decay heat removal capacity compared to the current design that do not have the thermosyphon. The new design reduces the temperature rise in the cooling air of the system and helps the surrounding structure in maintaining its mechanical integrity for long term operation at an accident. Also the analysis revealed the characteristics of the interactions among various heat transfer modes in the new design.
Modeling on the Condensation of a Stable Steam Jet Discharging into a Quenching Tank
Journal of Energy Engineering, volume 10, issue 4, 2001, Pages 349~356
Phenomenon of direct contact condensation (DCC) heat transfer between steam and water is characterized by the transport of heat and mass through a moving steam/water interface. Since the DCC heat transfer provides some advantageous features in the viewpoint of enhanced heat transfer, it is widely applied to the diversified industries. This study proposes a simple condensation model on the stable steam jets discharging into a quenching tank with subcooled water from a single horizontal pipe for the prediction of the steam jet shapes. The model was derived from the mass, momentum and energy equations as well as thermal balance equation with condensing characteristics at the steam/water interface for the axi-symmetric coordinates. The extremely large heat transfer rate at the steam/water interface was reflected in the effective thermal conductivity estimated from the previous experimental results. The results were compared with the experimental ones. The predicted steam jet shape(i. e. radius and length) by the model was increasing as the steam mass flux and the pool temperature were increasing, which was similar to the trend observed in the experiment.
Operating Characteristics of Ammonia-Water Absorber Heat Exchange Cycle
Journal of Energy Engineering, volume 10, issue 4, 2001, Pages 357~362
A bench type ammonia-water absorber heat exchange cycle was tested by varying the system charging concentration, refrigerating valve opening and weak solution flow rate. It was observed that the cooling capacity was increased as the system charging concentration was increased. Optimum system charging concentration was found for the coolong capacity of the system. The opening rate of refrigerant expansion valve had a direct influence on the refrigerant sub-cooling at the condenser outlet. Optimum sub-cooling was found to be 0~4
. As the weak solution flow rate increased the concentration of strong solution and the evaporating pressure decreased. There existed a optimum weak solution flow rate which maximized the cooling capacity and COP.
Evaluation Study on the Effects of
Reduction Techniques on the Performance and the Emission Characteristics of Medium Size Gasification Combined Cycle Plant
Journal of Energy Engineering, volume 10, issue 4, 2001, Pages 363~369
Process design and performance evaluation were made for medium-size gasification combined/cogeneration plant. Based on the designed plant process configuration, the effects of
reduction techniques on the
emission, the power output, the efficiency and the stability of plant are investigated by applying various
reduction methods such as unsaturated/saturated nitrogen injection and fuel saturation of gas turbine combustor. The
reduction by nitrogen injection is more remarkable than that by fuel saturation, and its effect can be more enhanced by using saturated nitrogen. In addition, the applications of
reduction techniques accompany the improvement of plant power output and efficiency with the decrease of
emission, while it can cause unstable gas turbine operation.
Characteristics and Synergistic Effects of Coal/Wasted Tire/Polypropylene Coliquefaction (II)
Journal of Energy Engineering, volume 10, issue 4, 2001, Pages 370~378
Characteristics and synergistic effects of the coliquefaction of Alaskan subbituminous coal, wasted tire, and polypropylene were investigated in a tubing-bomb reactor at 41
, and the coliquefaction reactions were performed at 37
to evaluate the coliquefaction mechanism. The coliquefaction kinetic model based on the free-radical theory was proposed and simulated by the non-linear parameter estimation method. Simulated results represented experimental ones successfully with the correlation coefficient of 0.99. When a catalyst was not used, the conversions were decreased as tetralin increase due to the decrease of liquefaction of polypropylene. When naphthenate catalysts of Mo, Co, and Fe were used, the coliquefaction conversions were increased with the increase of the liquefaction of polypropylene. When Co-naphthenate catalyst was used, the increase of the coliquefaction conversion were as high as 21~23%.
A Study on Nitric Oxide Formation & Reduction in Industrial Burner (I) -NO Concetration-Distribution in Double Swirling Diffusion Flame by LIF-
Journal of Energy Engineering, volume 10, issue 4, 2001, Pages 379~386
This experimental study deals with on Nitric Oxide Formation & Reduction in Industrial Bunner. In this study, Laser-induced fluorescence (LIF) techniques have been used for quantitative measurements of Nitric Oxide. The NO A-X (0, 0) Vibrational band around 226 nm was excited using a XeCl excimer-pumped dye laser. And on-line excitation used
transition, for minimizing the other interferential effect. The measurements were taken NO concentration distribution in double swirling diffusion flame. In this swirl burner, NO concentration in downstream fo the flame decrease as primary/secondary air ratio increases.