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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Korean Journal of Air-Conditioning and Refrigeration Engineering
Journal Basic Information
Journal DOI :
The Society of Air-Conditioning and Refrigerating Engineers of Korea
Editor in Chief :
Volume & Issues
Volume 19, Issue 12 - Dec 2007
Volume 19, Issue 11 - Nov 2007
Volume 19, Issue 10 - Oct 2007
Volume 19, Issue 9 - Sep 2007
Volume 19, Issue 8 - Aug 2007
Volume 19, Issue 7 - Jul 2007
Volume 19, Issue 6 - Jun 2007
Volume 19, Issue 5 - May 2007
Volume 19, Issue 4 - Apr 2007
Volume 19, Issue 3 - Mar 2007
Volume 19, Issue 2 - Feb 2007
Volume 19, Issue 1 - Jan 2007
Selecting the target year
A Numerical Analysis of the Abatement VOC in a Photocatalytic Micro-reactor
Youm, Min-Qou ; Jeong, Jin ; Kim, Chang-Nyung ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 19, issue 4, 2007, Pages 285~290
This study has been numerically conducted to investigate the removal efficiency of Volatile Organic Compound (VOC) in photocatalytic micro-reactor. This study has placed emphasis on the improvements of the working condition of photocatalytic micro-reactor. The micro-reactor consists of 19 microchannels with a rectangular cross-section. For the validation of the current numerical study, a computation has been carried out to simulate an existing experimental study on the cylindrical reactor, which has shown a good agreement. The degradation characteristics with different inlet concentrations and velocities have been obtained. The current results can be used for the design of advanced photocatalytic micro-reactor.
A Study on the Diffusion and Removal of Airborne Microorganism Pollution in Multistoried Apartment by the Multi-Zone Simulation
Hong, Jin-Kwan ; Choi, Sang-Gon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 19, issue 4, 2007, Pages 291~298
The purpose of this study is to evaluate the efficacy of multizone simulation that enables to grasp of details about microbial contaminant problem in an multistoried apartment. We used actual indoor test data to figure up microbial contaminant level as initial value for the multizone simulation and estimated the various effects of indoor occupant infected with germs such as bacteria and fungus and the performance of air sterilization by using multizone simulation in substitute for infeasible experimental approach. The results show that natural ventilation make ourselves generally useful for removing indoor microbial contaminants. The results also show that the performance of air sterilization reach the maximum in the case of using mechanical ventilation and UVGI air sterilizer. The conclusion is that this multizone simulation is useful tool for actual design method for immune building systems.
Examination of Airflow and Thermal Environment Characteristic around Human Body in a Room with Displacement Ventilation
Yang, Jeong-Hoon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 19, issue 4, 2007, Pages 299~306
Recently, the numerical analysis using person shape model for CFD (Computational Fluid Dynamic) has been researched widely for the thermal comfort and inhaled air quality of human body in the indoor environments. The purpose of this research is to examine the characteristic of airflow and thermal environment around human body by the experiment of displacement ventilation that assumes the indoor environment of natural convection. In this study, thermal manikin was used instead of real human body. The Airflow characteristic around human body was measured in precision by PIV (Particle Image Velocimetry). This experimental result will be used as data for CFD benchmark test using person shape model.
Evaluation of Thermal Comfort during Sleeping in Summer - Part IV : Study on Indoor Temperature Conditions for Comfort Sleep -
Kum, Jong-Soo ; Kim, Dong-Gyu ; Park, Jong-Il ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 19, issue 4, 2007, Pages 307~312
This study was performed to evaluate sleep efficiencies and conditions for comfortable sleep based on the analysis of sleep efficiency and MST under four thermals conditions (
). Five female subjects who have similar life cycle and sleep patterns were participated for the sleep experiment. Their age was from 20 to 22 years old. They were healthy, and had regular sleep with consistent bed and wakeup time. It was checked whether they had a good sleep before the night of experiment. Experiments were performed in an environmental chamber using thermo-hygrostat. The physiological signal (EEG) for sleep stage were obtained from C3-A2 and C4-Al electrode sites. Sleep stages were classified, then SWS latency and SWS/TST were calculated for the evaluation for sleep efficiencies on thermal conditions. As results, mean skin temperature for comfort sleeping was
. Considering sleep efficiency and mean skin temperature, indoor room temperature of upper limit was
Thermal Reliability Analysis of the Bearing Units in a Centrifugal Pump
Moon, Jung-Hwan ; Moon, Seung-Jae ; Lee, Jae-Heon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 19, issue 4, 2007, Pages 313~320
In this paper, the experimental study has been carried out to investigate the reliability lifetime of two bearing units based on the oil temperature. Measurements for the oil temperature as well as the bearing temperature during normal operation were performed to study the effects of oil viscosity and oil submergence percentages in the two bearing units. The optimal lubrication condition to increase the lifetime of the bearing unit A was found that its viscosity and submergence percentage were VG32 and 25%, respectively. For the bearing unit B, when the oil viscosity and submergence percent were VG32 and 75%, the lubrication condition was the most efficient. Finally, the adjusted rating times of both the bearing units were calculated to be over 28,000 h, which is greater than the minimum adjusted rating times of 25,000 h. Therefore, they satisfied the regulated lifetime of API 610.
A Numerical Study on the Performance Improvement of Kitchen Range Hood by Air Induction and Air Curtain
Sohn, Deok-Young ; Lim, Ji-Hong ; Choi, Yun-Ho ; Park, Jae-Hoon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 19, issue 4, 2007, Pages 321~327
In an apartment house that is generally air-tight and well insulated, the combustion gas from cooking devices is the major source of air pollution in the kitchen. It spreads throughout the house affecting the overall Indoor all quality. In this study, the performance of the kitchen range hood which employs air induction and air curtain was investigated by numerical simulation. The results are compared with that of two other kitchen range hoods which are in general use. The two general types of range hoods considered in the present calculations are box and plate type range hoods. The former has a large capture space between the filter and suction duct, while the latter has little. It was found that the capture efficiency of the kitchen range hood with air induction and air curtain Is higher than that of the general types of range hoods by 20% approximately The reason may be because the air induction and the air curtain block the air stream escaping from the front and the side part of range hoods effectively and because an additional fan for air induction and air curtain increases suction flow rates.
A Study of a Conduction Cooling System of a HTS SMES System
Koh, Deuk-Yong ; Lee, Kwan-Soo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 19, issue 4, 2007, Pages 328~332
A superconducting magnetic energy storage (SMES) system has shorter response time and longer life time, and is more economical, and environment-friendly than other uninterruptible power supply (UPS). A conduction cooling system is well answer for the high temperature superconductor (HTS) SMES system. Because the conduction cooling system is simple, light and small structure. The purpose of this paper is to design and verify the effective conduction cooling system for the HTS SMES system. The analysis of heat loads in cryostat is performed. Thermal shield heat loads, temperatures of HTS coil surface and conduction Cu plate are estimated and measured.
A Study of Optimum Insulation Conditions of a HTS Power Cable Cryostat
Koh, Deuk-Yong ; Lee, Kwan-Soo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 19, issue 4, 2007, Pages 333~338
The object of this study is to find the optimal insulation design conditions of a HTS power cable cryostat. The optimum condition of a cable cryostat is obtained by varying types of MLIs, cable core weights, spacer diameters, winding pitches and MLI layer numbers. As the weight of cable core is increased, conduction heat transfer from surroundings to cable cryostat is increased. But as the spacer pitch is increased from 120 mm to 200 mm, the heat leak of cable cryostat remains almost constant. The optimal number of MLI layers is suggested. Double ply MLI is more effective than triple ply MLI and the insulation effect is best when the number of MLI layers is 36.
Performance Enhancement of a PEMFC by Modification of Air Inlet Flow Header Configuration
Kim, Won-Nyun ; Kim, Yun-Ho ; Kim, Seo-Young ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 19, issue 4, 2007, Pages 339~345
In the present study, a 10-cell PEMFC stack with straight type cathode flow channels is employed to investigate the effect of inlet air flow header configuration on the overall fuel cell performance. Four different types of inlet flow headers are considered and the flow patterns according to the air inlet flow header configuration are numerically obtained. The computed result for a modified header predicts about 8.5% improvement in the air flow distribution at 10-cell cathode channel inlets. Experiments are also carried out to confirm the numerical findings by measuring actual air flow distributions and the polarization curves of the PEMFC stack.
A Research on Vocabulary Materialization for Evaluation of Architecture Plumbing Noise
You, Hee-Jong ; Jung, Eun-Jung ; Kim, Jae-Soo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 19, issue 4, 2007, Pages 346~354
Recently, in accordance with the buildings are rapidly becoming to high-stories, large-sizes, and since the case that noise of equipment machinery, tool itself infringes the life environment is on increasing, this is becoming to the object of civil appeal. Accordingly, in order to set up a countermeasure against such equipment machinery noise, even a systemic evaluating method is required, up to now while the appraisal that considering on the physical characteristic only had been done, but the characteristic about subjective valuation was not reflected as yet. Therefore, in this research, through the 1st, 2nd Psycho-Acoustics Experiments, the 30 vocabularies were extracted for evaluation of the construction equipment noise. As the result of Element Analysis, the 3 Elements were extracted from these vocabularies, and it could be understood that these Elements have been trustfully selected. It is now considering that the extracted vocabularies as per the above result would be used to Psycho-Acoustic Evaluation on Equipment Noise, and Psycho-Acoustics Experiment.