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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 22, Issue 12 - Dec 2010
Volume 22, Issue 11 - Nov 2010
Volume 22, Issue 10 - Oct 2010
Volume 22, Issue 9 - Sep 2010
Volume 22, Issue 8 - Aug 2010
Volume 22, Issue 7 - Jul 2010
Volume 22, Issue 6 - Jun 2010
Volume 22, Issue 5 - May 2010
Volume 22, Issue 4 - Apr 2010
Volume 22, Issue 3 - Mar 2010
Volume 22, Issue 2 - Feb 2010
Volume 22, Issue 1 - Jan 2010
Selecting the target year
Analysis on the Heat load Pattern According to Ratio of the Heat Consumers in District Heating
Lee, Hoon ; Lee, Yoon-Pyo ; Kim, Lae-Hyun ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 3, 2010, Pages 123~129
The district heating users can be generally classified into two groups such as apartments and buildings. In consideration that the time zone of the maximum heat load for apartments is different from those of buildings during a day, the maximum heat supply range is presented. In case of the investigated area, the maximum heat supply is occurred at the ratio between apartments and buildings that is 65%：35%. Thus the heat supply range is increased as much as 15% if the time zone when the maximum heat load is occurred is considered.
Thermal Reliability Analysis of BLDC Motor in a High Speed Axial Fan by Numerical Method
Moon, Sun-Ae ; Lee, Jae-Heon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 3, 2010, Pages 130~138
The thermal reliability of the closed-type BLDC motor for the high speed axial fans is analyzed by a numerical method in this paper. Since the module and the motor part are combined in a closed case, the heat generated from a rotor in the motor and the electronic components in the PCB module can not be effectively removed to the outside. Therefore the module will easily fail by high temperature. The accelerated-life testing was accomplished to formulate the life equation and numerical method is used to predict the inside temperature of the PCB module, which is one of the life equation parameter according to the environment. When the environment temperature of BLDC motor is 21, 35 and 50
, the temperature in the PCB space is predicted as 73.4, 87.5 and 102.4
. Then the life time with the temperature are calculated as 2,239, 863 and 328 hours.
The Design and Performance Test of a Centrifugal Compressor for HFC-134a Refrigerant
Sin, Jung-Kwan ; Kim, Kyung-Hoon ; Kang, Shin-Hyoung ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 3, 2010, Pages 139~148
A centrifugal compressor for HFC-134a has been newly designed and developed. Flow analysis using commercial programs was used to evaluate performance and internal flow of the impeller, inlet guide vane and diffuser etc. The purpose of this study is to establish the design theory necessary to the development of HFC-134a centrifugal compressors and to supply basic data related to design by reviewing design values and experimental values through the performance test. The compressor for HFC-134a was also investigated experimentally to check compression performance. The calculated data coincide the test results of compressor. The data obtained in the present study are useful for design of HFC-134a centrifugal compressors.
A Numerical Simulation of Flow and Heat Transfer in a Dimple-type Plate Heat Exchanger
Ahn, Hyuk-Jin ; Lee, Sang-Hyuk ; Hur, Nahm-Keon ; Park, Hyoung-Joon ; Ryu, Hea-Seong ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 3, 2010, Pages 149~155
In the present study, the characteristics on the internal flow and heat transfer of the dimple-type plate heat exchanger were numerically investigated. For the numerical analysis, the conjugate heat transfer analysis between hot fluid-separating plate-cold fluid was performed using the periodic boundary condition at the center area of the plate and appropriate inlet and outlet conditions for the two streams. The numerical results were validated by the comparison with the experimental data. From these results, the correlations of the Colburn j-factor for the heat transfer and the Fanning f-factor for the flow friction were obtained. The present results could be applicable for the optimal design of dimple-type plate heat exchanger.
A Combustion Instability Analysis of a Gas Turbine Combustor Having Closed Acoustic Boundaries at Both Ends
Cha, Dong-Jin ; Shin, Dong-Myung ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 3, 2010, Pages 156~164
Combustion instability is a major issue in design of gas turbine combustors for efficient operation with low emissions. Combustion instability is induced by the interaction of the unsteady heat release of the combustion process and the change in the acoustic pressure in the combustion chamber. In an effort to develop a technique to predict self-excited combustion instability of gas turbine combustors, a new stability analysis method based on the transfer matrix method is developed. The method views the combustion system as a one-dimensional acoustic system with a side branch and describes the heat source as the input to the system. This approach makes it possible to use not only the advantages of the transfer matrix method but also well established classic control theories. The approach is applied to a gas turbine combustion system, which shows the validity and effectiveness of the approach.
Performance of Thermoelectric Power Generator with Various Thermal Conditions
Han, Hun-Sik ; Kim, Myung-Kee ; Um, Suk-Kee ; Kim, Seo-Young ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 3, 2010, Pages 165~170
Experiments have been performed to investigate the key parameters determining the performance of thermoelectric power generation. The experimental results obtained show that the power output significantly increases with the temperature difference between cold and hot sides of thermoelectric generator. However, the effect of the hot side temperature under the identical temperature difference on the overall performance of a thermoelectric generator is meager. The conversion efficiency defined as the ratio of the power generated to the heat absorbed at the hot side increases with the temperature difference. The behavior of the thermoelectric generator is shown to be consistent with the theoretical analysis. The optimum current giving the maximum conversion efficiency and the maximum conversion efficiency are linearly increased with the temperature difference.
Cooling Performance of Thermoelectric Module with Air-Cooled Heat Exchanger Fins
Shin, Jae-Hoon ; Han, Hun-Sik ; Kim, Yun-Ho ; Kim, Seo-Young ; Hyun, Jae-Min ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 22, issue 3, 2010, Pages 171~179
Thermal performance of louver fin and plate fin in a thermoelectric cooling system with a duct-flow type fan arrangement is analytically evaluated. The thermoelectric cooling system consists of a thermoelectric module and two heat exchanger fins. The analytic results show that the optimized louver fin has lower thermal resistance than plate fin. The COP and heat absorbed rate of the thermoelectric cooling system with optimized louver fins are 10.3% and 5.8% higher than optimized plate fins, respectively.