Go to the main menu
Skip to content
Go to bottom
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 23, Issue 4 - Dec 2014
Volume 23, Issue 3 - Sep 2014
Volume 23, Issue 2 - Jun 2014
Volume 23, Issue 1 - Mar 2014
Selecting the target year
Experimental Analysis of Propensity for Spontaneous Combustion of Low-Rank Coal Upgraded by Spray Coating with Heavy Oil
Chun, Dong Hyuk ; Park, In Soo ; Kim, Sang Do ; Rhim, Young Joon ; Choi, Ho Kyung ; Yoo, Jiho ; Lim, Jeong Hwan ; Lee, Si Hyun ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 1~6
DOI : 10.5855/ENERGY.2014.23.2.001
Upgrading technology has been studied for efficient utilization of low rank coal. Spray coating of heavy oil was applied on the upgrading process in order to stabilize low rank coal against spontaneous combustion. Low rank coal, which contains more than 30wt% of moisture, was upgraded to high calorific coal and stabilized by spray coating of heavy oil. It was identified that spray coating of heavy oil after drying coal is the optimum procedure of upgrading low rank coal. The experimental results show that more than 2wt% of heavy oil should be adsorbed on the coal in order to stabilize sufficiently for spontaneous combustion.
Analysis of Adsorption Phenomena of Hydrogen on Carbon Nanotube usint Molecular Simulation
Chun, Dong Hyuk ; Moon, Jong-Ho ; Kim, Hyun Uk ; Park, Young Cheol ; Lee, Tai-Yong ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 7~12
DOI : 10.5855/ENERGY.2014.23.2.007
Molecular simulation was performed to evaluate the possibility of hydrogen storage of carbon nanotubes. The equilibrium state of hydrogen adsorbed on carbon nanotubes was simulated by grand canonical Monte Carlo method at constant temperature and pressure. The interaction energy between hydrogen molecule and carbon nanotube was calculated by Lennard-Jones potential model. According to the interaction energy calculated, more hydrogen molecules were adsorbed on the inside than the outside of nanotubes. Whereas the adsorption strength was higher outside than inside. Adsorption capacity was investigated for various temperature and pressure. The maximum capacity of carbon nanotube for hydrogen storage was 2.5wt% at 200 K and 200 bar.
Natural Convection Heat Transfer of an Inclined Helical Coil in a Duct
Park, Joo-Hyun ; Chung, Bum-Jin ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 13~20
DOI : 10.5855/ENERGY.2014.23.2.013
The natural convection heat transfers of a helical coil in a duct were measured experimentally varying the inclination. To achieve high Rayleigh number, mass transfer experiments instead of heat transfer experiments were performed based upon the analogy. The
was fixed to
. The turn numbers were 1~10. the pitch to diameter ratio were 1.3~5, and the inclination of the helical coil
. The measured
for a single turn of the helical coil was very close to that from McAdams heat transfer correlation for a horizontal cylinder. The heat transfers of the helical coil were varied by the pith, number of turns, and duct height in a complex manner showing the velocity, chimney, and pre-heating effects. The results of the study contributes to the phenomenological analyses of the natural convection heat transfer of a compact heat exchanger.
The Influence of the Surface Roughness on the Natural Convection on a Vertical Flat Plate
Ohk, Seung-Min ; Chung, Bum-Jin ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 21~27
DOI : 10.5855/ENERGY.2014.23.2.021
The influence of the surface roughness on the natural convection heat transfers of a vertical plate were measured experimently. Mass transfer experiments instead of heat transfer experiment were performed based on the analogy. The piecewise electrodes were adopted to measure the local-average Nusselt number. Prandtl number was 2,014 and height of the plate was 0.154m The test results for a smooth surface showed similar heat transfer rate with the Le Fevre heat transfer correlation for a vertical plate. The Nusselt number increased with the roughness Rz
. The test results were presented by a simple correlation.
A study on the evaluation of metal component in automatic transmission fluid by vehicle driving
Lee, Joung-Min ; Lim, Young-Kwan ; Doe, Jin-Woo ; Jung, Choong-Sub ; Han, Kwan-Wook ; Na, Byung-Ki ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 28~34
DOI : 10.5855/ENERGY.2014.23.2.028
Automatic transmission fluid (ATF) is used for automatic transmissions in the vehicle as the characterized fluid. Recently, the vehicle manufacture usually guarantee for fluid change over 80000~100000 km mileage or no exchange, but most drivers usually change ATF below every 50000 km driving in Republic of Korea. It can cause to raise environmental contamination by used ATF and increase the cost of driving by frequently ATF change. In this study, we investigate the various physical properties such as flash point, fire point, pour point, kinematic viscosity, cold cranking simulator, total acid number, and metal component concentration for fresh and used ATF after driving (50000 km, 100000 km). The result showed that the total acid number, pour point, Fe, Al and Cu component had increased than fresh ATF, but 2 kind of used oil (50000 km and 100000km) had similar physical values and metal component concentration.
A Study on the Heat Loss Effect of Steel Structure in a Refrigerator Mullion
Ha, Ji Soo ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 35~41
DOI : 10.5855/ENERGY.2014.23.2.035
The present study has been carried out to reduce the heat loss from a refrigerator by numerical heat transfer analysis and temperature measurement experiment for the verification of heat transfer analysis result. To perform this purpose, two dimensional heat transfer analysis and measurement of temperature on the surface of freezer for the horizontal cross sectional plane of a refrigerator has been accomplished. From the present study, it could be seen that the steel support in the mullion near gasket region has a heat transfer characteristics which transfer outside heat well from the high temperature hotline and outside air to the inner refrigerator. The effect of removing steel support on the reducing heat loss of a refrigerator was 24.8% and removing steel support might introduce significant improvement of refrigerator heat loss.
Investigation of Tar/soot Yield of Bituminous and Low Rank Coal Blends
Lee, Byung Hwa ; Kim, Jin Ho ; Kim, Gyu Bo ; Kim, Seng Mo ; Jeon, Chung Hwan ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 42~48
DOI : 10.5855/ENERGY.2014.23.2.042
Soot and tar which were derived from combustion or pyrolysis processes in Puverized Coal(PC) furnace or boiler have been significantly dealing in a radiative heat transfer and an additional source of NOx. Furthermore, the increasing for the use of a coal with low caloric value gives rise to a lot of tar-soot yield and LOI in a recycled ash for using cement materials. So, the ash with higher tar-soot yield and LOI can not recycle due to decreased strength of concrete. In this study, tar-soot yields and flame structures were investigated using the LFR for a blending combustion with bituminous coal and sub-bituminous coal. Also, The investigation were conducted as each single coals and blending ratio. The coals are used in a doestic power plant. In the experimental results, sub-bituminous coal with high volatile contents shows longer soot cloud length than bituminous coal, but overall flame length was shorter than bituminous coal. Tar-soot yields of sub-bituminous coal is lower than those of bituminous coal. Combustion characteristics are different between single coal and blended coal. Therefore, finding an optimal coal blending ratio according to coal rank effects on tar-soot yields.
A Study on Energy Saving Effect from Automatic Control of Air Flowrate and Estimation of Optimal DO Concentration in Oxic Reactor of Wastewater Treatment Plant
Kim, Min Han ; Ji, Seung Hee ; Jang, Jung Hee ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 49~56
DOI : 10.5855/ENERGY.2014.23.2.049
It is important to keep stable effluent water quality and minimize operation cost in biological wastewater treatment plant. However, the optimal operation is difficult because of the change of influent flow rate and concentrations, the nonlinear dynamics of microbiology growth rate and other environmental factors. Therefore, many wastewater treatment plants are operated for much more redundant oxygen or chemical dosing than the necessary. In this study, the optimal control scheme for dissolved oxygen (DO) is suggested to prevent over-aeration and the reduction of the electric cost in plant operation while maintaining the dissolved oxygen (DO) concentration for the metabolism of microorganisms in oxic reactor. For optimal control, The oxygen uptake rate (OUR) is realtime measured for the identification of influent characterization and the identification of microorganisms' oxygen requirement in oxic reactor. Optimal DO seT-Point needed for the microorganism is suggested based on real time measurement of oxygen uptake of microorganism and the control of air blower. Therefore, both stable effluent quality and minimization of electric cost are satisfied with a suggested optimal setpoint decision system by providing the necessary oxygen supply requirement to the microorganisms coping with the variations of influent loading.
Thermal management system for electric vehicle batteries and technology trends
Seo, Hyun Sang ; Cho, Haeng Muk ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 57~61
DOI : 10.5855/ENERGY.2014.23.2.057
Challenges the automotive industry as the increase in consumption of oil and energy,
emissions of global warming, caused by exhaust emissions and urban air pollution, it is time for a deal is needed. The solution of these highly regarded in the market as there is a demand of electric cars. In this study, electric car motor, battery and high-voltage core components, including the drive motor of the effective thermal management technologies, thermal management of the battery and the drive motor to evaluate the technology and development trends.
Optimization of biomethane production by biogas upgrading process using response surface mothodolgy
Park, Seong-Bum ; Sung, Hyun-Je ; Shim, Dong-Min ; Kim, Nack-Joo ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 62~73
DOI : 10.5855/ENERGY.2014.23.2.062
This research was focused to apply response surface methodology for optimization of bio-methane production by biogas upgrading process. Methane concentration(Y1) and methane efficiency(Y2) on biogas upgrading process were mathematically described as being modeled by the use of the Box-Behnken design on response surface methodology. The results of ANOVA(analysis of variance) about models, the probability value of the methane concentration and methane recovery response surface model are 0.0001 and 0.0001, respectively and coefficient of determination(
) are 0.9788 and 0.9710, respectively. The response surface model is proved of high reliability and suitability. The operation pressure had the greatest influence to methane concentration than other operation parameters and the PSA rotary valve velocity had the greatest influence to methane recovery than other operation parameters. Optimal condition of biogas upgrading process for production of
bio-methane were operation pressure 8.0bar and outlet flow rate 31.55RPM, respectively. At that operation condition the methane concentration of bio-methane was 97.13% and methane recovery in biogas upgrading process was 75.89%.
An Analysis on the Economic Impacts of the Bio-gas Supply Sector
Baek, Min-Ji ; Kim, Ho-Young ; Yoo, Seung-Hoon ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 74~82
DOI : 10.5855/ENERGY.2014.23.2.074
The government is planning to expand the bio-gas supply as a method for mitigating greenhouse gas emissions to deal with climate change. By means of a policy instrument, the government is considering an introduction of the Renewable Fuel Standard (RFS) whose targets include bio-gas. This paper attempts to look into the economic effects of expanding the bio-gas supply by applying an input-output (I-O) analysis using a 2011 I-O table. The bio-gas supply sector consists of liquefied petroleum gas supply sector and city gas supply sector, based on the tenets of introducing the RFS. The production-inducing effect, value-added creation effect, and employment-inducing effect of the bio-gas sector are analyzed. The supply shortage effect and the price pervasive effect are also investigated. The results show that the production or investment of 1.0 won in the bio-gas supply sector induces the production of 1.0539 won and the value-added of 0.1998 won in the national economy. Moreover, the production or investment of 1.0 billion won, supply shortage of 1.0 won, and a price increase of 10.0% in the bio-gas supply sector touch off the employment of 0.5279 person, 1.6229 won, and an increase in overall price level by 0.0183%, respectively.
Comparative Analysis on the Economic Effects of Integrated-Energy and Manufactured Gas Supply Sectors
Park, So-Yeon ; Lee, Kyoung-Sil ; Yoo, Seung-Hoon ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 83~92
DOI : 10.5855/ENERGY.2014.23.2.083
This paper attempts to conduct a comparative analysis on the economic effects of integrated-energy and manufactured gas supply sectors. To this end, an input-output (I-O) analysis is applied using most recently published 2011 I-O table. In particular, the two sectors are specified as exogeneous to identify the economic effects on own and other sectors. Production-inducing effect, value-added creation effect, and employment-inducing effect are quantified based on demand-driven model. Supply shortage effect and price pervasive effect are analyzed employing supply-driven model and Leontief price model, respectively. The results show that production-inducing effect, value-added creation effect, and employment-inducing effect of integrated-energy and manufactured gas supply sectors are estimated to be 1.5461 vs. 1.0297, 0.4759 vs. 0.1941, and 2.2885 vs. 0.4053 respectively. Price pervasive effects of the 10% increase in integrated-energy and manufactured gas supply sectors are computed to be 0.0127% and 0.1585%, respectively. This information can be utilized in forecasting the economic effects of introducing integrated-energy or manufactured gas as a heating source and the impacts of a rise in price of integrated-energy or manufactured gas on price level of other sectors.
Analysis of energy security by the diversity indices: A case study of South Korea
Jang, Yong-Chul ; Bang, Ki-Yual ; Lee, Kwan-Young ; Kim, Kyung Nam ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 93~101
DOI : 10.5855/ENERGY.2014.23.2.093
How to determine the extent of national energy security? In this paper, we estimate it by comparative analysis of South Korea and other OECD countries in terms of energy diversity (fuel diversity). Energy security consists of 4 key factors such as availability, accessibility, acceptability, affordability. Especially the importance of accessibility can grow as local imbalance of supply and demand increases. As a proxy of the accessibility, fuel diversity can be a significant indicator to estimate a measure of energy security. In this paper, we use Shannon-Wiener index to measure energy diversity. If fuel diversity increases, the stability of energy security also should increase, because of the smoothing effect to lessen dependence on key energy sources. In 2012 Korean growth rate of H-index (energy diversity) is 18.38%, which is higher than other OECD countries. However, Korean H-index itself is 1.93, lesser than other countries. Shift from oil to coals/gas within fossil fuels has more impact on H-index than weight transition from fossil fuels to renewable energies in Korea. We conclude that more renewable energy is an effective solution to achieve higher energy diversity and ultimately higher energy security as the same as the German case.
An Analysis on the Value Chain of Korean Bioenergy Industry
Park, Chang-Dae ; Chae, Yeoung-Jin ; Park, Jung-Gu ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 102~113
DOI : 10.5855/ENERGY.2014.23.2.102
This study analyzes whether the value-added structure of Korean bioenergy industry exhibits a virtuous cycle through the value chain(VC) within bioenergy firms, using a regression analysis based on a survey to Korean bioenergy companies. As a result, in Korean bioenergy companies, the R&D outputs positively influence an increase in production, and a decrease in production costs positively influences an increase in profit rates per sales. However, the government's supports for R&D is analyzed neither to lead an increase in corporates' R&D investments, nor to contribute to an increase in their R&D outputs. In addition, it turns out that an increase in production does not contribute to a decrease in production costs. Besides, it is analyzed that an increase in profit rates per sales does not contribute to an increase in production or an increase in the R&D investments. The virtuous cycle of the value chain in Korean bioenergy firms is, therefore, estimated to be weak. This study has a policy implication to need further efforts to create the virtuous cycle in the VC of Korean bioenergy industry.
A Study on the Fluid Dynamic of Catalytic Converter in Exhaust Pipe
Wangwenhai, Wangwenhai ; Cho, Haeng Muk ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 114~118
DOI : 10.5855/ENERGY.2014.23.2.114
The need to maximize the exhaust pipe inside surface and to minimize exhaust resistance And Find the best point between the exhaust and the duration of contact between the two surfaces. Exhaust gas mass flow On the whole cross section of catalytic converters more uniform distribution will contribute to its usability. Based on the flow rate of fluid traces given color, Exhaust fluid resistance in the porous catalyst can be estimated, from the efficiency of the catalytic converter that is very important.
Relationship between declining oil use and electrification
Choi, Hyo-Yeon ; Kim, Sun-Young ; Yoo, Seung-Hoon ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 119~124
DOI : 10.5855/ENERGY.2014.23.2.119
After the oil crisis in 1970s, many countries have tried to reduce oil dependency. Especially, in Korea, rapid declining oil consumption has speedily brought to electrification and a surge in electricity demand. This paper attempts to estimate the relationship between declining oil use and electrification in Korea using OECD panel data covering from 1985 to 2011. To this end, random effect model and fixed effect model are employed. The increase in the ratio of energy oil to total energy consumption by 10%p leads to reduce the electricity demand by about 15%. This result can be useful information to cope with the recent crisis of electric power. In addition, industrial sector is ranked in forth the ratio of industrial electricity use to total electricity use according to the result of comparative analysis of electricity consumption by use in OECD countries. Therefore, industrial sector should be treated as the main target of demand-side management policies for electricity.
An historical analysis on the carbon lock-in of Korean electricity industry
Chae, Yeoungjin ; Roh, Keonki ; Park, Jung-Gu ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 125~148
DOI : 10.5855/ENERGY.2014.23.2.125
This paper performs a historical analysis on the various factors contributing to the current carbon lock-in of Korean electricity industry by using techo-institutional complex. The possibilities of the industry's carbon lock-out toward more sustainable development are also investigated. It turns out that market, firm, consumer, and government factors are all responsible for the development of the carbon lock-in of Korean power industry; the Korean government consistently favoring large power plants based on the economy of scale; below-cost electricity tariff; inflation policy to suppress increases in power price; rapid demand growth in summer and winter seasons; rigidities of electricity tariff; and expansion of gas-fired and imported coal-fired large power plants. On the other hand, except for nuclear power generation and smart grid, environment laws and new and renewable energy laws are the other remaining factors contributing to the carbon lock-out. Considering three key points that Korea is an export-oriented economy, the generation mix is the most critical factor to decide the amounts of carbon emission in the power industry, and the share of industry and commercial power consumption is over 85%, it is unlikely that Korea will achieve the carbon lock-out of power industry in the near future. Therefore, there are needs for more integrated approaches from market, firm, consumer, and government all together in order to achieve the carbon lock-out in the electricity industry. Firstly, from the market perspective, it is necessary to persue more active new and renewable energy penetration and to guarantee consumer choices by mitigating the incumbent's monopoly power as in the OECD countries. Secondly, from the firm perspective, the promotion of distributed energy system is urgent, which includes new and renewable resources and demand resources. Thirdly, from the consumer perspective, more green choices in the power tariff and customer awareness on the carbon lock-out are needed. Lastly, the government shall urgently improve power planning frameworks to include the various externalities that were not properly reflected in the past such as environmental and social conflict costs.
A Study on the Resistance of Stress Corrosion Cracking due to Expansion Methods for Steam Generator Tubes in Nuclear Power Plants
Kim, Young Kyu ; Song, Myung Ho ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 149~157
DOI : 10.5855/ENERGY.2014.23.2.149
The steam generator tubes of nuclear power plants have various types of corrosion failures during the plant operation. The stress corrosion cracking which occurs on the outer surface of tube is called the secondary side stress corrosion cracking and mainly occurs in the expansion-transition area of tube. The causes are the concentration of impurities by the sludge pile-up related to the geometry of its region and the residual stress by tube expansion in the process of steam generator manufacturing. Especially the directionality and sizes of residual stresses are differed according to the tube expansion methods and the direction and the frequency of tube cracks depend on their characteristics. In bases on the plant experiences, it is notified that circumferential cracks of tubes expanded with explosive expansion method are dominantly occurred compared to those of tubes done with hydraulic expansion one. Therefore in this study, according to tube expansion methods frequencies and sizes of tube cracks with specific direction are compared by means of accelerated immersion test and also the crack morphology and the specific chemicals from water-chemistry environment are observed through the fracture surface examination.
Accounting for Early Action with Consideration of Energy Efficiency Improvements
Kim, Changseob ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 158~169
DOI : 10.5855/ENERGY.2014.23.2.158
In the context of
mitigation, how early reduction action taken by individual companies previous to the actual regulated period is implemented at the free allocation process, remains one of the major issues. This article considered efficiency factor as a criterion for the early action. Then the emissions allowance allocated was compared and analyzed with and without the consideration of early action. In the cases of manufacturing sectors of Korea for the period 2001~2009, it is shown that emissions in the all industries fell by their efficiency factors. The amounts of emissions allowance allocated to the all industries except petro-chemistry are increased when EA is counted in the allocation process.
A STUDY ON THE PERFORMANCE AND EMISSIONS CHARACTERISTICS OF SPARK IGNITION ENGINE FUELLED WITH ETHANOL GASOLINE BLENDED FUEL
Han, Sung Bin ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 170~174
DOI : 10.5855/ENERGY.2014.23.2.170
This paper presents the influences of ethanol addition to gasoline on bench test a spark ignition engine performances and emissions characteristics. The use of ethanol gasoline blended fuels decrease the brake power and brake torque, and increases the brake specific fuel consumption (BSFC). Ethanol gasoline blended fuels show lower brake torque and brake power and higher BSFC than gasoline. When ethanol containing oxygen is blended with gasoline, the combustion of the engine becomes better and therefore CO emission is reduced. HC emissions decrease to some extent as ethanol added to gasoline increase, as the percentage of ethanol in the blends increased, NOx emission was decreased under various engine speeds.
Study on Performance Evaluation and Efficiency Comparison for Solar Collector with Thermosyphon Tube-type
Sim, Han-Sub ; Yang, Young-Joon ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 175~182
DOI : 10.5855/ENERGY.2014.23.2.175
The use of solar energy among renewable energy tends to increase because of infinity and cleanness of resources. Even though the consumption rate of solar energy in our country is still low, however, in recent years, the research for solar energy have been widely conducted due to policy support of government. This study was performed to make the system of performance test for solar collector and to investigate thermal efficiency for solar collector with thermosyphon tube-type. As a result, in case of indoors measurement using halogen lamp, thermal efficiency for solar collector with thermosyphon tube-type was increased about 15~22% after 120 minutes compared with that of solar collector with double evacuated tube-type. In addition, in case of outdoors measurement, thermal efficiency of thermosyphon tube-type was showed maximum about 46% higher than double evacuated tube-type.
An Establishment of Commercial Grade Item Dedication Implementing System for Operating NPPs in Korea
Yeom, Dong Un ; Chang, Hee Seung ; Song, Tae Young ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 183~190
DOI : 10.5855/ENERGY.2014.23.2.183
A Commercial Grade Item Dedication(CGID) for Korean operating nuclear power plants has been implemented since 2012. The CGID implementation and strategies for Korea are established as follows: CGID policy establishment, R&D of a specific methodologies of CGID, enrollment of third party organizations for CGID work, CGID program establishment for enrolled suppliers, establishment of training courses for certification, and CGID process development for quality class Q and A. Consequently, it is expected that these activities are enable to enhance the reliability and the safety of components and/or parts in nuclear power plants.
Development of Maintenance Effectiveness Monitoring Program for APR1400 Safety Related Systems
Yeom, Dong Un ; Hyun, Jin Woo ; Song, Tae Young ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 191~198
DOI : 10.5855/ENERGY.2014.23.2.191
Korea Hydro & Nuclear Power Co. (KHNP) has developed and implemented the maintenance effectiveness monitoring (MR) programs for the operating nuclear power plants. MR programs are developed by reflecting design characteristics of the operating nuclear power plants to monitor the plant performance for improving the safety and reliability. Recently, KHNP has developed the MR program for APR1400 safety related systems to establish the advanced maintenance system and will verify the suitability of the MR program through evaluating initial performance. Consequently, it is expected that the safety of the new plant will be improved by developing and implementing the MR program.
A Survey on the M&V to guarantee the energy saving performance of ESCO
Lim, Ki Choo ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 199~206
DOI : 10.5855/ENERGY.2014.23.2.199
ESCO industry should guarantee the energy saving performance in response to changes of regulations ESCO. In this point, the application of the M&V is important task on energy saving performance. Therefore, we need to examine the contents of practice for the M&V in developed countries. Between energy user and ESCO, it is important to provide and measure the energy saving performance by guarantee of energy savings performance contracts. After 2013 ESCO business began focusing on guaranteed savings contracts. For this reason, we need to take M&V cases recommended from IPMVP and applied in United States and Japan. Therefore, we should be ready about M&V application for the real conditions of ESCO.
Analysis on Energy Demand Resulting From the Change in Window Area & Installation of Interior Exterior Blinds
Kim, Dae-Won ; Chung, Kwang-Seop ; Kim, Young-Il ; Nam, Ariasae ; Oh, Se Min ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 207~216
DOI : 10.5855/ENERGY.2014.23.2.207
The energy loss can be divided into the loss caused by heat transfer and the loss caused by air flow. Heat transfer is the loss resulting from the heat transmittance of external wall, roof, and floor, and represents one of the most vulnerable elements of existing buildings. To prevent such loss, it is necessary to increase the mean heat transmittance of entire external wall, including the window, to a level above the standard regional value and ensure the air-tightness of window. The old buildings have the structure which is prone to the loss of greater air flow due to the air infiltration through the exit/entrance door upward along the stairway by the stack effect and simultaneous suction of air from each floor, and becomes even vulnerable to the loss of heat insulation for each floor, although the external wall and windows are the most vulnerable parts. The improvement plans for each floor need to be submitted in tandem with the diagnosis of whole building, regarding the diagnosis plan and energy improvement measures based on the survey of site, rather than adhering to the misconception that the replacement of window alone will result in energy-savings.
A Study on the Effects of Etching Surface Characteristics on Condensation Heat Transfer in Pre-heating Exchanger
Seok, Sungchul ; Hwang, Seung Sik ; Choi, Gyu Hong ; Shin, Donghoon ; Chung, Tae Yong ;
Journal of Energy Engineering, volume 23, issue 2, 2014, Pages 217~222
DOI : 10.5855/ENERGY.2014.23.2.217
In order to improve the heat efficiency of the general residential boiler, we performed an experiment of condensation heat transfer to air pre-heating exchanger adhered to the condensing boiler. In this study, surface roughness was imposed on the surface of stainless steel by etching. And in order to evaluate the heat transfer performance on each plate, the counter flow heat exchanger fabricated with polycarbonate in used. As a result, on etching treated plate's overall heat transfer coefficient is higher than the original plate. And etching treated plate during 60 seconds with etchant is the to average 15% compared to bare stainless steel. And we studied the heat transfer enhancement factor through the analysis of surface characteristics using AFM.