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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 25, Issue 12 - Dec 2013
Volume 25, Issue 11 - Nov 2013
Volume 25, Issue 10 - Oct 2013
Volume 25, Issue 9 - Sep 2013
Volume 25, Issue 8 - Aug 2013
Volume 25, Issue 7 - Jul 2013
Volume 25, Issue 6 - Jun 2013
Volume 25, Issue 5 - May 2013
Volume 25, Issue 4 - Apr 2013
Volume 25, Issue 3 - Mar 2013
Volume 25, Issue 2 - Feb 2013
Volume 25, Issue 1 - Jan 2013
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Study on the Cooling Performance of Single and Cascade Refrigeration Systems Using Thermoelectric Modules
Lim, Changhak ; Kim, Dongwoo ; Kim, Yongchan ; Seo, Kookjeong ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 12, 2013, Pages 641~646
DOI : 10.6110/KJACR.2013.25.12.641
The purpose of this study is to improve the cooling performance of single and cascade refrigeration systems using thermoelectric modules. The system consists of a heat sink, fan, and thermoelectric module. The operating parameters considered in this study include power distribution between the first- and second-stage thermoelectric modules, air flow, and variable condensing unit. The cooling capacity increased with decreases in the temperature difference between hot and cold surfaces, but decreased with increases in the condensing temperature. The COP decreased with increasing electric power of the thermoelectric module because of the increased Joule heat. The cooling performance improvement using the thermoelectric module is represented by the freezer temperature.
Study on the Characteristics of Thermal Output and Thermal Storage in a Thermally Activated Building System with Phase Change Material
Lee, Hyunhwa ; Lee, Soojin ; Song, Jinhee ; Kim, Sumin ; Lim, Jaehan ; Song, Seung-Yeong ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 12, 2013, Pages 647~653
DOI : 10.6110/KJACR.2013.25.12.647
TABS (Thermally Activated Building System) has recently applied by huge commercial buildings, airports, and convention centers in Europe. TABS provides night-time thermal storage by heating or cooling. The embedded water-based heating and cooling system uses the high thermal inertia of concrete in the building construction, in which a heating or cooling pipe is embedded. The aim of this study is to analyze the thermal storage and thermal output of TABS applied with PCM (Phase Change Material). To achieve this, prototypes of TABS and the thermal properties of various PCMs were investigated. By using the simulation program Physibel Voltra 6.0 W, the thermal storage and thermal output were evaluated according to a heating and cooling operation schedule.
Louvered Fin Heat Exchanger : Optimal Design and Numerical Investigation of Heat and Flow Characteristics
Ryu, Kijung ; Lee, Kwan-Soo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 12, 2013, Pages 654~659
DOI : 10.6110/KJACR.2013.25.12.654
This paper presents a numerical optimization of louvered fins to enhance the JF factor in terms of the design parameters, including the fin pitch, the number of louvers, the louver angle, the fin thickness, and the re-direction louver length. We carried out a parametric study to select the three most important parameters affecting the JF factor, which were the fin pitch, number of louvers, and the louver angle. We optimally designed the louvered fin by using 3rd-order full factorial design, the kriging method, and a micro genetic algorithm. Consequently, the JF factor of the optimum model increased by 16% compared to that of the base model. Moreover, the optimum model reduced the pressure drop by 17% with a comparable heat transfer rate.
Validity of Inter-Particle Models for the Mass-Transfer Kinetics of a Fin-Tube-Type Adsorption Bed
Ahn, Sang Hyeok ; Hong, Sang Woo ; Kwon, Oh Kyung ; Chung, Jae Dong ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 12, 2013, Pages 660~667
DOI : 10.6110/KJACR.2013.25.12.660
This study presents a numerical investigation of the heat and mass transfer kinetics of a fin-tube-type adsorption bed using a two-dimensional numerical model with silica-gel and water as the adsorbent and refrigerant pair. The performance is strongly affected by the heat and mass transfer in the adsorption bed, but the details of the mass transfer kinetics remain unclear. The validity of inter-particle models used to simulate mass-transfer kinetics were examined, such as a constant pressure model and non-constant pressure model, and the valid ranges of the diffusion ratio for each model are proposed. The COP and SCP have been numerically calculated as the performance indexes according to the diffusion ratio. The constant pressure model, which is commonly used in previous research, was found to be valid only in a limited range of diffusion ratio.
Fabrication and Performance Investigation of Surface Temperature Sensor Using Fluorescent Nanoporous Thin Film I
Kim, Hyun Jung ; Yoo, Jaisuk ; Park, Jinil ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 12, 2013, Pages 668~673
DOI : 10.6110/KJACR.2013.25.12.668
In this study, specimens with nano-sized porous thin films were manufactured by injecting fluorescence solution into the pores. We intended to find out the difference of the fluorescence intensity in each region of the specimen through an experimental apparatus that makes a temperature field. Before conducting experiments, the optimized manufacturing conditions were determined by analysis of all parameters that influence the emission intensity, and the experiments were carried out with the specimens produced in the optimized conditions. Then, the calibration curves of the fluorescence intensity versus temperature were performed by taking the intensity distributions from the specimen in various temperature fields. The surfaces of specimens were coated with Rhodamine-B (Rh-B) fluorescent dye and measured based on the fluorescence intensity. Silica (SiO2) nanoporous structure with 1-um thickness was constructed on a cover glass, and fluorescence dye was absorbed into these porous thin films.
Fabrication and Performance Investigation of Surface Temperature Sensor Using Fluorescent Nanoporous Thin Film II
Kim, Hyun Jung ; Yoo, Jaisuk ; Park, Jinil ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 12, 2013, Pages 674~678
DOI : 10.6110/KJACR.2013.25.12.674
We present a non-invasive technique to the measure temperature distribution in nano-sized porous thin films by means of the two-color laser-induced fluorescence (2-LIF) of rhodamine B. The fluorescence induced by the green line of a mercury lamp with the makeup of optical filters was measured on two separate color bands. They can be selected for their strong difference in the temperature sensitivity of the fluorescence quantum yield. This technique allows for absolute temperature measurements by determining the relative intensities on two adequate spectral bands of the same dye. To measure temperature fields, Silica (SiO2) nanoporous structure with 1-um thickness was constructed on a cover glass, and fluorescent dye was absorbed into these porous thin films. The calibration curves of the fluorescence intensity versus temperature were measured in a temperature range of
, and visualization and measurement of the temperature field were performed by taking the intensity distributions from the specimen for the temperature field.
Development of Correlation Analysis on the Test Methods of Furniure-like Products
Kim, Su Ha ; Lee, Yun Gyu ; Seo, Young Min ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 12, 2013, Pages 679~684
DOI : 10.6110/KJACR.2013.25.12.679
Hazardous chemicals emitted from building materials and furniture have led to social problems such as sick house syndrome. Test methods for the evaluation of pollutant emissions from furniture-like products have been applied using various national and international standards and classifications, but they are not currently unified. This research has been done to organize the various standards and certification methods and to make new classification systems. Proper test methods have been proposed, tested, and analyzed through this research.
A Study on the Operational Strategies for Outdoor Air Temperature Change Characteristics in a Radiant Floor Heating System
Ahn, Byung-Cheon ; Song, Jae-Yeob ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 12, 2013, Pages 685~692
DOI : 10.6110/KJACR.2013.25.12.685
In this study, the control characteristics and effects of heating control methods on the heating performance and energy consumption of a hot-water heating control system of a residential apartment were researched by simulation and experiment. The purpose of this study is to evaluate operational strategies for improving an indoor thermal environment and reducing f energy consumption in the radiant floor heating system of a residential apartment.
Comparative Study on Size Optimization of a Solar Water Heating System in the Early Design Phase Using a RETScreen Model with TRNSYS Model Optimization
Lee, Kyoung-Ho ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 12, 2013, Pages 693~699
DOI : 10.6110/KJACR.2013.25.12.693
This paper describes a method for size optimization of the major design variables for solar water heating systems at the stage of concept design. The widely used RETScreen simulation tool was used for optimization. Currently, the RETScreen tool itself does not provide a function for optimization of the design parameters. In this study, an optimizer was combined with the software. A comparative study was performed to evaluate the RETScreen-based approach with the case study of a solar heating system in an office building. The optimized results using the RETScreen model were compared to previously published results with the TRNSYS model. The objective function of the optimization is the life-cycle cost of the system. The optimized design results from the RETScreen model showed good agreement with the optimized TRNSYS results for the solar collector area and storage volume, but presented a slight difference for the collector slope angle in terms of the converged direction of the solutions. The energy cost, life-cycle cost, and thermal performance regarding collector efficiency, system efficiency, and solar fraction were compared as well, and the RETScreen model showed good agreement with the TRNSYS model for the conditions of the base case and optimized design.