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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of Energy Engineering
Journal Basic Information
Journal DOI :
The Korea Society for Energy Engineering
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Volume & Issues
Volume 24, Issue 4 - Dec 2015
Volume 24, Issue 3 - Sep 2015
Volume 24, Issue 2 - Jun 2015
Volume 24, Issue 1 - Mar 2015
Selecting the target year
Application of Well Allocation Factor for Injection Optimization of Waterflooding
Yoon, Su-Jin ; Kang, Pan-Sang ; Lim, Jong-Se ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 1~10
DOI : 10.5855/ENERGY.2015.24.4.001
For successful operation of waterflooding which is one of secondary recovery methods, suitable water injection allocation is important to increase oil recovery. Well allocation factor(WAF) which is one way to quantify the injector and producer connectivity, is utilized to allocate water injection of waterflooding. Static WAF cannot represent the field condition and can induce incorrect value. To compensate for limitation of static WAF, modified WAF which includes several parameters that affect patterns including well radius, distance between wells, and injection rates is proposed. In this study, static and modified WAFs were applied to injection optimization of waterflooding and results by each WAF were compared. In case of modified WAFs, produced water were less and produced oil were more than case of static WAF especially in big change of distance between producer and injector. Therefore, modified WAFs can allocate water injection more efficiently than static WAF.
A Study on Biogas Yield According to Food Waste Leachate Acid Fermentation Conditions
Moon, Kwangseok ; Pak, Daewon ; Kim, Jaehyung ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 11~17
DOI : 10.5855/ENERGY.2015.24.4.011
This study performed acid fermentation pre-treatment to improve production efficiency of methane that is produced as a product in case of anaerobic fermentation by using food waste leachate, and attempted to confirm the acid fermentation optimum through the BMP test by using pre-treated food waste leachate to increase the yield of methane. As a result of the BMP experiment by using acid fermented food waste leachate, the highest yield of methane of 0.220 L/g VS was confirmed in the HRT three-day condition, and in the initial BMP test by pH, pH 6 was 19,920 mg/L that the highest VFA and acetic acid/TVFA(76.2%) were shown. At this time, it was confirmed that the yield of methane was mostly within 10 days that was reduced to around one-third compared to the general methane fermentation (within 30 days). As the yield of methane was 0.294 L/g VS, it showed a high efficiency of around 1.3 times compared to the control group.
The Measurement of Flash Point for Unflammable-Flammable Binary Mixtures(CCl
+o-Xylene and CCl
+p-Xylene) Using Open Cup Tester
Kim, Chang-Seob ; Lee, Sungjin ; Ha, Dong-Myeong ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 18~23
DOI : 10.5855/ENERGY.2015.24.4.018
The flash point is used to categorize inflammable liquids according to their relative flammability. The flash point is important for the safe handling, storage, and transportation of inflammable liquids. The flash point temperature of two binary liquid mixtures(
) has been measured for the entire concentration range using Tag open cup tester. The flash point temperature was estimated using Raoult`s law, UNIQUAC model and empirical equation. The experimentally derived flash point was also compared with the predicted flash point. The empirical equation is able to estimate the flash point fairly well for
A study on Property of Emission Gas by the Content Variation of Urea
Kang, Hyungkyu ; Doe, Jinwoo ; Hwang, Inha ; Im, Jaeheuk ; Ha, Jonghan ; Na, Byungki ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 24~32
DOI : 10.5855/ENERGY.2015.24.4.024
National and international regulations on the exhaust gases of diesel engines are being strengthened, and a study of the combutsion engine and the post-porcessing system are in progress as a variety of ways. There are many techniques for the removal of nitrogen oxide like HC-SCR, LNT, Urea-SCR. And the technical development on the Urea-SCR owing to high conversion efficiency and fuel economy characteristics has being processed. This study investigated the physical/chemical properties of urea according to the change of the urea content, and were analysed the characteristic of exhaust gas. According to the increase of urea content, the contests of biuret aldehyde, phosphate content was increased and the changes of emission quantity of carbon monoxide, hydrocarbons and particulate matter in the exhaust gas was very slight. The emission quantity of NOx was decreased in accordance with increasing the urea content and it was shown to be more than 80 % in the urea solution having more than 30 wt%.
Feasibility Test of LPG Vehicles by Using DME-LPG Blends
Youn, Jumin ; Lee, Minho ; Park, Cheonkyu ; Hwang, Inha ; Ha, Jonghan ; Kang, Yong ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 33~41
DOI : 10.5855/ENERGY.2015.24.4.033
Dimethyl ether (DME) can be used as a clean diesel alternative fuel due to the high cetane number and low emission, it can also be applied to automotive fuel as a blended liquefied petroleum gas (LPG) because physical properties are similar to those of LPG. In this study, feasibility test of LPG vehicle using blended DME-LPG fuel was investigated. Three types of fuel supply such as LPLi (Liquid phase LPG injection), LPGi (Liquid phase gas injection) and mixer type were selected to consider the LPG fuel-injection system. The performance characteristics of LPG vehicle were examined by using LPG and blended DME-LPG fuel in order to compare the exhaust emissions (CO, THC,
) and fuel economy. The emissions and fuel economy of DME-LPG blend fuel were comparable to those of LPG with increasing driving distance.
Characteristics of Particle Number and Exhaust emission by Alteration of MTBE Contents in Gasoline
Lim, Taeyoon ; Song, Hoyoung ; Park, Cheonkyu ; Hwang, Inha ; Ha, Jonghan ; Na, Byungki ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 42~47
DOI : 10.5855/ENERGY.2015.24.4.042
While the oxygen content of gasoline for automobiles in Korea is regulated to less than 2.3 weight %, European and World-Wide Fuel Charter (WWFC) regulate it to less than 2.7 weight %. The oxygen content of oxygen-containing materials increases the octane number of the fuel due to the secondary combustion in the internal combustion engine. It has been reported to be effective in reducing emissions, such as CO, HC, which is caused by incomplete combustion. Before 2000s in the United States and Europe, there has been many researches about vehicle application of the changes in oxygen content of gasoline. However, there are not many domestic researches which reflect the improvement of the fuel quality and automotive technology. In this study, fuels of three different oxygen contents were applied to GDI and MPI engines. As a result, the changes of fuel consumption and emission gas were very similar depends of the oxygen content changes. The PN in GDI engine was decreased as the oxygen content was increased.
Thermal Stress Anaysis of Burning Plate by Configuration of Outdoor Gas Boiler
Lee, Suk Young ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 48~54
DOI : 10.5855/ENERGY.2015.24.4.048
This study investigates the result of thermal stress analysis on burning plate by classes at outdoor gas boiler. In the analysis results at the steady state, the maximum stress and deformations are 666,8MPa at A type and 0.20476mm at B type respectively. The deformation becomes larger as the field goes on from the center to the outside at burning plate. As there are 8 types in the order of maximum stress and deformation, F and C type have safest among 8 types respectively. Therefore, F type becomes most excellent on strength and safety among 8 types. By using the analysis result of burning plate model at gas boiler, it is possible to design the model applied practically at the safe component parameters of boiler system.
Effects of Defect Size on Crush Test Load of Butt Fusion Welded MDPE Pipes
Tun, Nwe Ni ; Lai, Huan Sheng ; Jeon, Gyu Min ; Yoon, Kee Bong ; Kil, Seong Hee ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 55~62
DOI : 10.5855/ENERGY.2015.24.4.055
It is expected that the size of welding defect affects the mechanical performance of welded medium density polyethylene (MDPE) pipe joints. In this study, butt fusion welded MDPE pipe joints with a single spherical or planar defect of various sizes were studied using experimental crush testing and also by finite element method. The crush test showed that the mechanical performance of crush was not affected by the size and geometry of a single welding defect when the defect size was increased to 45% of the pipe`s wall thickness. The simulation results indicated that the effect of the single welding defect on the Von Mises stress distribution near the defect explained the reason of the test results.
A Study on the Enhance of Air tightness Performance of a New Type Silding Window with horizontally Rolling Wheels
Jang, Hyok-Soo ; Kim, Young-Il ; Chuung, Kwang-Seop ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 63~70
DOI : 10.5855/ENERGY.2015.24.4.063
Crevices between window and window frame cause not only heat losses but also serve path to sound transmission and infiltration of fine dusts that are harmful to humans. There were many efforts in the past to eliminate these crevices but because of the windows` indispensable function of opening and closing, it was an unsolvable problem. In this study, a new type sliding window is developed by applying horizontally rolling wheels to implement a surface sealing which is excellent for enhancing air tightness. To evaluate the feasibility of the newly developed window, forces for opening and closing, durability and air tightness were testet according to Korean Testing Standards. Force for opening a 2000 N window is 30 N. It endured 100,000 cycles of opening and closing. Infiltration was
for a pressure difference of 10 Pa. Since this window has few moving parts, it has favorable features of low cost and few breakdown.
A Study on the Thermal Bridge Reduced Stiffeners for the Reduction of Window Overall Hear Transfer Coefficient
Jang, Hyok-Soo ; Kim, Young-Il ; Chung, Kwang-Seop ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 71~80
DOI : 10.5855/ENERGY.2015.24.4.071
Steel stiffener is required for reinforcing the structure of the window frame made of versatile but weak PVC material. Steel stiffener however becomes a source of greater heat loss and frequently plays a role of thermal bridge due to its high thermal conductivity. To maintain thermal resistance similar to PVC frame, steel stiffener is perforated to reduce the effective heat transfer area. To compensate the structural strength of the steel stiffener which is weakened by the perforation, the thickness is increased. Increase in thickness will also increase the thermal heat resistance. Five samples which are PVC frame, PVC frame + original steel stiffener, PVC frame + 30% perforated steel stiffener, PVC frame + 50% perforated steel stiffener, PVC frame + 65% perforated steel stiffener are modeled and simulated for 2nd moment of area and thermal resistance. Therm/window version 6.3 is used for thermal analysis. The results show that among the five samples analyzed, PVC frame + 65% perforated steel stiffener best satisfies both structural strength and thermal resistance.
Economic Comparison of Medium Capacity and Multi Boiler System Applied to Military Officer Housing
Kim, Min-yong ; Kim, Young Il ; Chung, Kwang Seop ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 81~88
DOI : 10.5855/ENERGY.2015.24.4.081
In midst of electrical energy consumption on the rise due to the industrial development and the improved quality of living, medium capacity and multi boilers which use gas that is comparatively low cost and can be supplied reliably are simulated for energy consumption using the partial load data obtained from the experiment. Economic analysis that considers initial and operation costs is carried out based on the Annual equal payment method.
The Study on the Combustion and Ash Deposition Characteristics of Ash Free Coal and Residue Coal in a Drop Tube Furnace
Moon, Byeung Ho ; Kim, Jin Ho ; Sh, Lkhagvadorj ; Kim, Gyu Bo ; Jeon, Chung Hwan ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 89~96
DOI : 10.5855/ENERGY.2015.24.4.089
Recently, much research has been put into finding the causes and solutions of slagging/fouling problems that occur at the end of the boiler. This slagging/fouling, caused by low-rank coal`s ash, disturbs the thermal power and greatly reduces efficiency. In environmental aspects, such as NOx pollution, governments have been implementing restrictions on the quantity of emission gases that can be released into the atmosphere. To solve these problems, research on Ash Free Coal (AFC), which eliminates ash from low-rank coal, is in progress. AFC has advantages over similar high-rank coals because it increases the heating value of the low grade coal, reduces the contaminants that are emitted, and decreases slagging/fouling problems. In this study, using a DTF, the changes of NOx emissions, unburned carbon, and the characteristics of ash deposition were identified. KCH raw coal, AFC extracted from KCH, residue coal, Glencore, and Mixed Coal (Glencore 85wt% and residue coal 15wt%) were studied. Results showed that AFC had a significantly lower emission of NOx compared to that of the raw coal and residue coal. Also, the residue coal showed a higher reactivity compared to raw coal. And finally, In the case of the residue coal and mixed coal, they showed a lower ash deposition than that of low-rank coal.
Analysis of Renewable Energy R&D Efficiency
Cho, Inkyung ; Kim, Kyunghee ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 97~104
DOI : 10.5855/ENERGY.2015.24.4.097
The performance in scientific contribution of renewable energy R&D has been overlooked, as it is shown in terms of industrial aspect. This paper analyzed the R&D efficiency of scientific aspects of each renewable energy resource in 2008-2012. Total R&D fund and the number of supported projects are selected as input variables, and the number of patents and papers as output variables to analyze the direct efficiency using DEA method. Through the analysis, it determines the efficiency of each energy resource R&D, and investigated the causes of inefficiency. This study has meaning to include entire renewable energy sources for the analysis, and is expected to serve as an important reference in policy making.
Airside Performance of Fin-and-Tube Heat Exchangers Having Round Wave Fins
Kim, Nae-Hyun ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 105~116
DOI : 10.5855/ENERGY.2015.24.4.105
In this study, airside performance of round fin-and-tube heat exchangers are compared with that of the herringbone wave fin-and-tube heat exchangers with an aim to investigate the effect of fin shape on thermal performance. Results show that j factors of the round wave fin are 1.2~22% larger than those of herringbone wave fin. The f factors of the round wave fin are -1.0~29% smaller than those of herringbone wave fin for 1 or 2 row configuration. For 3 row configuration, f factors of the round wave fin are 8.3~23% larger. The reason may be attributed to the reduced recirculation zone in the valley of the fin for round wave fin as compared with that of the herringbone wave fin. For round wave fin, the effect of fin pitch on j and f factor is not significant. In addition, j factors decrease as the number of tube row increases. On the other hand, f factors are independent of the number of tube row. A new correlation was developed based on the present data.
Effects on the Gas Dispersion by Changed Gas Composition
Min, Dongchul ; Gye, Hyeri ; Kim, Sungtae ; Kim, JongMin ; Kwon, Jeong-Rock ; Kim, Byung-Duk ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 117~123
DOI : 10.5855/ENERGY.2015.24.4.117
Recetly, Many industry have used unknown composition gases and no information gases. These gases were used increasing. As use increases, The more important software that can predict dispersion region and speed. It is very difficult to predict the dispersion of new gases. Because, it is predict from existing database. In this study, we propose to esimate dispersion region and speed of some gases, using a FLACS software and equivalent gas.
An Experimental Study on Performance of Vapor Compression Refrigeration Cycle with Al
Kim, Jeongbae ; Lee, Kyu-Sun ; Lee, Geunan ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 124~129
DOI : 10.5855/ENERGY.2015.24.4.124
An experimental study was performed estimating COP(Coefficient of Performance) of air-conditioning cycle using inverter scroll compressor with and without
nano particle. All experiments were done for various compressor speeds from 1000~4000 rpm and used the inverter controller called CANDY to change the compressor rpm. The air-conditioning cycle components in the apparatus were used as same with components of YF hybrid car. To estimate the COP, this study measured the temperature and pressure at inlets and outlets of compressor, condenser, and evaporator. And also measured the compressor input power using Powermeter. Through the experiments, the maximum error to estimate COP was shown about
at 3500rpm. The COP of refrigeration cycle with
nano-particle was similar with that of the base cycle without nano-particle between 1000~3000 rpm of the compressor speed. But, This study showed that the COP of the cycle with
over 3000 rpm of the compressor speed was higher than that of the base cycle due to the higher heat transfer rate increased in the evaporator from the higher oil flow rate inside the cycle as well known. Those results can be used the basic and fundamental data to design the air-conditioning cycle using inverter scroll compressor with
A Study on the Order of Priority for the Technoloy·policy of GHG Reduction in Power Plant using AHP
Lee, Won-Goo ; Kim, Hyung-Taek ; Park, Yong-Gu ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 130~139
DOI : 10.5855/ENERGY.2015.24.4.130
Korea country was set up over 30% greenhouse gas reduction target in comparision with BAU(Business as usal) at the national level, depending on climate change, which have been promoted as several technical and policy planning in order to reduce national greenhouse gas reduction. In this study, we derived the policies and technologies of power plant sector that is a high rate of reduction and public interest, we established a model for a common evaluation indicators and each of the evaluation factors between policy and technology priorities based on appropriate subject experts using analytic hierarchy process(AHP). Further we suggest insight to electricity company to establish the investment strategies of the technology and the associated policy by applying a weight evaluation index presenting a comprehensive priority.
The Effect of Biodiesel Blend Fuels As Reductants on NOx Conversion Efficiency of HC_SCR
Song, Hoyoung ; Lee, Minho ; Kim, Kiho ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 140~145
DOI : 10.5855/ENERGY.2015.24.4.140
This study was aimed at analyzing NOx conversion characteristics in the HC-SCR with biodiesel content changes of the secondary fuel injection (BD0, BD10, BD25). Test conditions for temperature were set to
considering the upstream temperature of a HC-SCR, distillation of the secondary injected fuels and etc. The amount of fuel injection was adjusted with a fixed space velocity of 55,000(1/h). According to the test results of distillation, the T90 was the same level about
on all test fuels and the amount of evaporation was reduced at lower than
temperature condition with increasing biodiesel content. As biodiesel content which is mixed with the secondary injected fuel is increased, NOx reduction efficiency was determined to decrease. The difference of the Nox reduction ratio in a high temperature condition(
) than the low temperature(
) was more significant. These results are thought to be poor evaporation properties (distillation) and high molecular weight of the biodiesel.
Greenhouse Gas Emission and Abatement Potential Analysis for the Korean Horticulture Energy Sector Using Bottom-Up Approach
Paik, Chunhyun ; Chung, Yongjoo ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 146~158
DOI : 10.5855/ENERGY.2015.24.4.146
A bottom-up approach has been conducted to estimate greenhouse gas (GHG) emission and to analyze the marginal abatement cost for the Korean horticulture energy sector. With the systematically derived activity and energy balance data, the BAUs have been estimated, along with the marginal abatement cost over the period 2010 through 2030. The result from the marginal abatement cost analysis may provide general guidelines and procedures for the establishment of GHG abatement polices.
A Design Optimization on Coupling Joint between Exhaust Chimney of Electricity Generator and Electromagnetic Pulse (EMP) Shield
Pang, Seung-Ki ; Kim, Jae-Hun ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 159~165
DOI : 10.5855/ENERGY.2015.24.4.159
The article presents a parametric study on geometrical design optimization for coupling the joint between a large exhaust air chimney and electromagnetic pulse (EMP) shield for gas turbine electricity generator. We conducted computational fluid dynamics (CFD) simulations on hydraulic diameters of waveguide below cutoff(WBC) ranges 800mm~1025mm, the connection distance ranges 150~450mm, and exhaust gas flow velocities at 15, 20, and 25m/s. The results show that the diameter of main chimney, connection distance, and exhaust gas velocity had impacts on flow stream at the EMP shield. To provide a fully developed stream line at three different flow velocity cases, the WBC diameter and distance of connection should be larger than 1050mm and longer than 300mm, respectively.
A Impact Study on Combustion Characteristics of the Engine by Changing the Gasoline Properties
Noh, Kyeong-ha ; Im, Sang-bin ; Lee, Min-ho ; Kim, Ki-ho ; Ha, Jong-han ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 166~174
DOI : 10.5855/ENERGY.2015.24.4.166
This study examined combustion characteristics by selecting the fuel which have a different physical properties compared to gasoline in order to examine the effects of vehicle performance and environment depending on the physical properties. The experiment examined the combustion characteristic in the optimum ignition timing according to the physical properties change and the lean burn by performing control about ignition timing and air-fuel ratio for each fuel, and it was also evaluated the exhaust gas according to the experiment. We used a single-cylinder engine for the experiment, and tested for gasoline properties change by selecting a fake fuel that beyond the fuel quality standards in 석대법. As a result, in the case of the selected fuel showed a difference in Octane and distillation characteristics, vapor pressure and it was also found to unstable combustion, and leads to a large amount of harmful exhaust gas.
Analysis of Loss of Condenser Vacuum Accident using a Conservative Approach with a Best-Estimate Code
Jeong, Hae-Yong ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 175~182
DOI : 10.5855/ENERGY.2015.24.4.175
A methodology to determine the most conservative initial condition based on random sampling of operation parameters is established, in which a best-estimate computer code is adopted to minimize the conservatism in code models. To validate the applicability of the suggested method, safety evaluation for a transient of loss of condenser vacuum in a pressurized water reactor is performed. One-hundred different initial conditions are generated by MOSAIQUE program automatically and the peak pressure for the most conservative case is determined from transient analyses. The safety margin obtained with the new approach is almost equivalent to the values determined with the existing methodologies. It is found that the time and human resources required for the safety evaluation could be reduced with the suggested approach.
A Study on the Primary Energy Change Amount and Grade Correlation following Factor Changes such as Area, Point of the Compass, Standard Layer, Insulation, Airtight Joint and Others
Kim, Dae-Won ; Chung, Kwang-Seop ; Kim, Young-Il ; Nam, Ariasae ; Kim, Sung-Min ; Cho, Young-Wook ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 183~191
DOI : 10.5855/ENERGY.2015.24.4.183
Studies on the environment-friendly and permanent low energy saving measure are and will continue to be an eternal challenge. However, the demand is high for the technologies that can save energy significantly in everyday life that produce tangible benefits for the users by applying saving factors and that anyone can access easily when it comes the related procedure. Government policies related to the improvement of energy effect in the existing building structure are characterized by complex procedure. Moreover, cost required and reliability issue emerge when request is made to an expert. Accordingly, this study seeks to present energy improvement plan that can be utilized simply and conveniently at any place, any time by enabling customized design according to individual taste by enabling energy change amount and grade prediction when the users select only the part that they want to replace by using a simple program.
A Technical Assessment of Possibility Sanction for Assistance to DPRK
Chung, Yongjin ; Kwon, Yongchai ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 192~199
DOI : 10.5855/ENERGY.2015.24.4.192
Under the economic banner of "self-reliance," North Korea has focused on hydro and thermal power as its main energy supply sources. However, in the face of extreme energy penury caused by machinery and material supply instability in the wake of the collapse of the former communist block as well as equipment aging and deterioration due to floods and other disasters, North Korea and international aid organizations are increasingly turning their attention toward energy source diversification. In particular, renewable energy is recognized as the best strategic energy source for North Korea and it is a decentralized energy option that is suitable in light of North Korea`s power distribution networks and its pursuit of self-reliance. Biogas can contribute to improving the human rights situation of North Koreans in conjunction with an increase in food production. For this reason, renewable energy is the most promising option for an energy source that is likely to secure humanitarian aid from international organizations such as the Food and Agricultural Organization (FAO) and the World Food Programme (WFP). However, the implementation of such humanitarian aid has been hampered by rising concerns about the diversion of provided energy materials for military purposes and the disguised introduction of dual use items strategic materials as well as UN Security Council resolutions and sanctions of the international community against North Korea`s military provocation, including nuclear tests and missile launches. This paper explores the possibility of solving this dilemma and proceeding with the humanitarian aid to North Korea by evaluating the potential for sanction and the risk of diversion of the possible products for biogas-related aid on the basis of the list of UN-sanctioned items.
Simulation and model validation of Biomass Fast Pyrolysis in a fluidized bed reactor using CFD
Ju, Young Min ; Euh, Seung Hee ; Oh, Kwang cheol ; Lee, Kang Yol ; Lee, Beom Goo ; Kim, Dae Hyun ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 200~210
DOI : 10.5855/ENERGY.2015.24.4.200
The modeling for fast pyrolysis of biomass in fluidized bed reactor has been developed for accurate prediction of bio-oil and gas products and for yield improvement. The purpose of this study is to analyze and to compare the CFD(Computational Fluid Dynamics) simulation results with the experimental data from the CFD simulation results with the experimental data from the reference(Mellin et al., 2014) for gas products generated during fast pyrolysis of biomass in fluidized bed reactor. CFD(ANSYS FLUENT v.15.0) was used for the simulation. Complex pyrolysis reaction scheme of biomass subcomponents was applied for the simulation of pyrolysis reaction. This pyrolysis reaction scheme was included reaction of cellulose, hemicellulose, lignin in detail, gas products obtained from pyrolysis were mainly
. The deviation between the simulation results from this study and experimental data from the reference was calculated about 3.7%p, 4.6%p, 3.9%p for
respectively, whereas 9.6%p and 6.7%p for
and CO which are relatively high. Through this study, it is possible to predict gas products accurately by using CFD simulation approach. Moreover, this modeling approach should be developed to predict fluidized bed reactor performance and other gas product yields.
A Study on the Characteristics of Lift Fluctuation Power Spectral Density on a Fin Tube in the Heat Recovery Steam Generator
Ha, Ji Soo ; Lee, Boo Youn ; Shim, Sung Hun ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 211~216
DOI : 10.5855/ENERGY.2015.24.4.211
Heat exchanger tube array in a heat recovery steam generator is exposed to the hot exhaust gas flow and it could cause the flow induced vibration, which could damage the heat exchanger tube array. It is needed for the structural safe operation of the heat exchanger to establish the characteristics of flow induced vibration in the tube array. The researches for the flow induced vibration of typical heat exchangers have been conducted by using single cicular tube or circular tube array and the nondimensional PSD(Power Spectral Density) function with the Strouhal number, fD/U, had been derived by experimental method. From the present study, the basis for the application of flow induced vibration to the heat recovery steam generator tube array would be prepared. For the previous mentioned purpose, the present CFD analysis introduced a single fin tube and calculated with the unsteady laminar flow over the single fin tube. The characteristics of vortex shedding and lift fluctuation over the fin tube was investigated. The derived nondimensional PSD was compared with the results of the previous experimental researches and the characteristics of lift PSD over a single fin tube was established from the present CFD study.
Simulation and Prediction on the Performance of a Hydrogen Engine
Han, Sung Bin ;
Journal of Energy Engineering, volume 24, issue 4, 2015, Pages 217~222
DOI : 10.5855/ENERGY.2015.24.4.217
A computer simulation has been developed to predict and investigate the performance of the assumed hydrogen engine. The simulation has be come a powerful tool as it saves time and also economical when compared to experimental study. The effects of various parameters, such as equivalent ratio, spark advance, revolutions per minute were calculated and then the optimal parameters of assumed engine were determined. The effects of spark advance, revolutions per minute, cylinder pressure, rate of pressure rise, flame temperature, rate of heat release, and mass fraction burned were simulated. The objective of the research paper is to develop a internal combustion model with hydrogen as a fuel.