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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 15, Issue 4 - Dec 2006
Volume 15, Issue 3 - Sep 2006
Volume 15, Issue 2 - Jun 2006
Volume 15, Issue 1 - Feb 2006
Selecting the target year
A Theoretical Review on the Experience Curve toy Energy Technology
Chang, Han-Soo ; Choi, Ki-Ryun ;
Journal of Energy Engineering, volume 15, issue 4, 2006, Pages 209~228
The learning effect is one of the theoretical frameworks that examine the mechanisms of the deployment of energy technologies. The objective of this paper is to provide a theoretical overview and a critical analysis of the literature on the experience curve for energy technology. For these objectives, we review a couple of theoretical aspects and applications and investigate the sources of learning and cost reductions to grasp the mechanisms of teaming effect. Finally we conclude some insights from our theoretical reviews.
Optimal Dispatch and Reserve Pricing Reflecting Opportunity Cost
Kim, Jong-Deoc ; Bae, In-Su ; Kim, Jin-O ;
Journal of Energy Engineering, volume 15, issue 4, 2006, Pages 229~234
Electric energy is too difficult to manage realtime for irregular change of load because of non-storage. In specially, operation of reserve is ancillary service to supply stably to defend large troubles in electric power system. But whole of electric power system brings to economical loss because of reserve operation. Therefore optimal reserve quantity and optimal reserve price are necessary in order to minimize loss. In this paper, we have presents optimal dispatch and reserve price consideration of opportunity cost.
A Study on Performance Improvement of Heat Pump Adopting the Hot Gas Bypass Method
Kang, Shin-Hyung ; Byun, Ju-Suk ;
Journal of Energy Engineering, volume 15, issue 4, 2006, Pages 235~242
This study experimentally investigates the performance improvement of the heat pump by adopting the hot gas bypass method and using the internal heat exchanger according to the automatic defrost test conditions of ISO 5151 This study compares the hot gas bypass method with the time step method, and investigates effect on outdoor coil fan speed when the hot gas of compressor outlet enter outdoor coil inlet after the frost formation. The tests were made for the fan speeds of the outdoor coil controlled at 90, 60 and 30% of the normal speed together with the case of the stationary fan. The performance of the heat pump is evaluated by variables such as COP, heat capacity, and the average COP during the 210 minutes heating mode. Results show that average COP of the hot gas bypass mettled is
higher than that of the time step method. When the outdoor coil fan speed is 60% (780 rpm) of the normal speed, it shows the best COP and heating capacity.
Prediction and Experiment of Pressure Drop of R22 and R134a on Design Conditions of Condenser
Kang, Shin-Hyung ; Byun, Ju-Suk ; Kim, Chang-Duk ;
Journal of Energy Engineering, volume 15, issue 4, 2006, Pages 243~249
An experimental study on the refrigerant-side pressure drop of slit fin an tube heat exchanger has been carried out. A comparison was made between the predictions of previously proposed empirical correlations and experimental data for the pressure drop on design conditions of condenser in micro-fin tube for R22 and Rl34a. Experiments were carried out under the conditions of inlet refrigerant temperature of
and mass fluxes varying from
for R22 and Rl34a. The inlet air conditions are dry bulb temperature of
, relative humidity of 40% and air velocity varying from 0.68 to 1.43 m/s. Experiments show that pressure drop for R134a was
higher than R22 for the degree of subcooling
For the mass fluxes of
, the deviation between the experimental and predicted values for the pressure drop was less than
for R22 and Rl34a.
Application of Discrete-Ordinate Method to the Time Dependent Radiative Heat Transfer Calculations
Noh, Tae-Wan ;
Journal of Energy Engineering, volume 15, issue 4, 2006, Pages 250~255
In this study, the discrete ordinates method which has been widely used in the solution of neutron transport equation is applied to the solution of the time dependent radiative transfer equation. The self-adjoint form of the second order radiation intensity equation is used to enhance the stability of the solution, and a new multi-step linearization method is developed to avoid the nonlinearity in the material temperature equation. This new solution method is applied to the well known Marshak wave problem, and the numerical result is compared with that of the conventional Monte-Carlo method.
A Study on the Monitoring of Market Power using Contingent Transmission Rights in Competitive Electricity Markets
Park, Jung-Sung ; Han, Seok-Man ; Kim, Bal-Ho ;
Journal of Energy Engineering, volume 15, issue 4, 2006, Pages 256~276
Transmission congestion is one of the key factors to local market power in competitive electricity markets. Financial transmission rights provide the financia] protection to their holders by paying back the congestion rent. A variety researches have shown that the existing trading mechanisms on transmission right can exacerbate market power. This paper proposes an alternative methodology in mitigating the local market power using the Contingent Transmission Rights on the locational marginal pricing scheme. The proposed methodology was demonstrated with the Optimal Power Flow.
An Experimental Study on the Fundamental Characteristics of LPG Gas Injections System
Jang, Yeol-Sung ; Woo, Sung-Dong ; Kim, Hyeong-Sig ; Park, Chan-Jun ; Ohm, In-Yong ;
Journal of Energy Engineering, volume 15, issue 4, 2006, Pages 277~283
In this study, butane 100% was used as fuel to verify the real fuel effect such as vapor pressure variation due to temperature change. A MPI fuel injection system for V-6 engine, which has reverse 'L' type cross section to minimize the possibility of liquid phase injection, was composed and one bank was operated under sequential injection scheme. Flow rate were measured according to injection duration, interval, and pressure. Also occurring of liquid phase injection was monitored with varying vaporizer and fuel rail temperature. The result shows that basic characteristics of injection is a relatively difference between air and LPG injection. Under cold start condition, however, the occurrence of liquid injection becomes more severe as the pressure increases, and sufficiently high temperature both in vaporizer and fuel rail is very important to insure gaseous injection. In addition, the temperature of vaporizer plays more important role in keeping LPG vapor state and the reverse 'L' type cross section of the rail is available to prevent liquid injection.
A Study on a Resorption Beat Pump Using Methanol-Glycerine
Min, Byong-Hun ;
Journal of Energy Engineering, volume 15, issue 4, 2006, Pages 284~290
The improvement of energy recovery is mandatory to decrease consumption of fossil fuels and to minimize negative impacts on the environment which originates from large cooling and heating demand. The absorption heat pump technology has a large potential for energy saving in this respect. Absorption heat pump is a means to upgrade waste heat without addition of extra thermal energy. In this study, resorption heat pump for energy recovery has been investigated using methanol-glycerine. The simulated calculation of theoretical thermal efficiency was performed based on the thermodynamic properties of the working fluid over various operating conditions. The thermal efficiency of higher than 0.4 was obtained by raising industrial waste heat,
in this system.