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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 18, Issue 12 - Dec 2006
Volume 18, Issue 11 - Nov 2006
Volume 18, Issue 10 - Oct 2006
Volume 18, Issue 9 - Sep 2006
Volume 18, Issue 8 - Aug 2006
Volume 18, Issue 7 - Jul 2006
Volume 18, Issue 6 - Jun 2006
Volume 18, Issue 5 - May 2006
Volume 18, Issue 4 - Apr 2006
Volume 18, Issue 3 - Mar 2006
Volume 18, Issue 2 - Feb 2006
Volume 18, Issue 1 - Jan 2006
Selecting the target year
Evaluation of Thermal Comfort during Sleeping in Summer - Part III : About Indoor Air Temperatures Rise -
Kim Dong-Gyu ; Kum Jong-Soo ; Kim Se-Hwan ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 18, issue 7, 2006, Pages 535~540
This study was performed In evaluate sleep efficiencies and conditions for comfortable sleep based on the analysis of Physiological signals under variations in thermal conditions. Five female subjects who have similar life cycle and sleep patterns were participated for the sleep experiment. It was checked whether they had a good sleep before the night of experiment. EEGs were obtained from C3-A2 and C4-A1 electrode sites and EOGs were acquired from LOC (left outer canthus) and ROC (right outer canthus) for REM sleep detection. Sleep stages were classified, then TST (total sleep time), SWS (slow wave sleep) latency and SWS/TST were calculated for the evaluation of sleep efficiencies on thermal conditions. TST was defined as an amount of time from sleep stage 1 to wakeup. SWS latency was from light off time to sleep stage 3 and percentage of SWS over TST was calculated for the evaluation of sleep quality and comfort sleep under thermal conditions. As result, the condition which raise a room temperature provided comfortable sleep.
A Prediction of Hybrid Ventilation System Performance in Apartment House
Hwang Ji-Hyeon ; Oh Chang-Yong ; Kim Moo-Hyun ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 18, issue 7, 2006, Pages 541~548
A hybrid ventilation system was introduced to predict the ventilation performance of the apartments. This ventilation system was composed of the natural supply-air inlet and the forced exhaust-air outlet. Analysis was conducted by CFD technique and was performed on three ventilating flow rates; 30, 60,
. As the results, residents feel comfortable thermally for
. In the case of
, however, residents feel uncomfortable both thermally and in air currents. In this study the energy saving for space heating is also an important factor. In the case of whole region with
, residents feel comfortable at each region of the model apartment. It is shown that this hybrid ventilation system is possible method for the apartment house.
An Experimental Study on the Sterilizing and Antibacterial Performance of Polybutylene Pipe with Nano-Silver
Choi Sang-Gon ; Hong Jin-Kwan ; Kim Yong-Bong ; Yang Chan-Mo ; Park Min-Kyu ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 18, issue 7, 2006, Pages 549~555
In the present study, sterilizing and antibacterial performance tests of Polybutylene pipe with nano-silver were carried out in the testing bench of water supply facilities. Experimental results show that the average sterilizing and antibacterial rate of two micro-biological samples such as E. coli and S. aureus is about 90% in case of stillness experimental condition and 99% in case of flowing experimental condition, when elapsed time is 120 hours and 3 hours, respectively. Experimental results also show that the supply water velocity in nano-silver Polybutylene pipe varies from 1 m/s to 1.5 m/s, the elapsed time needed sterilizing rate reach to 100% decreases.
Design of an Ammonia/water Bubble Absorber with Binary Nanofluids
Kim Jin-Kyeong ; Kim Sung-Soo ; Kang Yong-Tae ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 18, issue 7, 2006, Pages 556~562
The objectives of this paper are to analyze simultaneous heat and mass transfer performance for a plate type bubble absorber with binary nanofluids numerically and to investigate the effects of binary nanofluids and surfactants on the size of the bubble absorber. The effective absorption ratio represents the effect of binary nanofluids and surfactants on the absorption performance. The kinds and concentrations of nano-particles and surfactants are considered as the key parameters. The results show that the addition of surfactants can reduce the size of absorber up to 74.4%, the application of binary nanofluids does the size up to 63.6%. Combination of binary nanofluids and surfactants can reduce the size of absorber up to 77.4%.
A Study on the Emission Characteristics of Gaseous Organic Contaminants from Building Materials and Newly Constructed Apartments
Kim Yun-Deok ; Lee Yun-Gyu ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 18, issue 7, 2006, Pages 563~570
We investigated the emission characteristics of gaseous organic contaminants from building materials and newly constructed apartments. The emission test for building materials was done with small chamber method, and field measurements in newly constructed apartment were carried out by Korea Standard Test Method for Indoor Air Quality. First, the emission test by small chamber showed that the TVOC emission from building materials was much higher than formaldehyde. On the other hand, as expected, considerably high concentration of both TVOC and HCHO was detected in the new apartment.
Characteristics of the Ice Slurry Transportation System for District Cooling Depending on the Transportation Lines
Lee Yoon-Pyo ; Chung Jae-Dong ; Yoon Seok-Mann ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 18, issue 7, 2006, Pages 571~577
The characteristics of ice packing factor (IPF) at the ice slurry system using one line type are compared with the system using two lines type. The installation space for one transporting line is saved at the one line system. For the one line type, the ice packing factor is reduced along the downstream, but for the two lines type, the ice packing factor is fixed. For the one line system, mass flow rate in the main line is fixed along the down-stream, but for two lines system, the mass flow rate in the main line is reduced along the downstream. For one line system, along the down stream after IPF=0, the temperature at the main steam is increased, and the extracted mass flow is increased. The initial IPF, at which the IPF is not arrived at zero upto the final node, is proposed for the B area.
Numerical Analysis on Recirculation Generated by Obstacles around a Cooling Tower
Lee Jung-Hee ; Choi Young-Ki ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 18, issue 7, 2006, Pages 578~586
The present study has been conducted to examine the effect of obstacles around a cooling tower and an air-guide to prevent recirculation. In order to analyze the interaction between external flow and cooling tower exit flow, the external region as well as the cooling, tower are included in computational domain. Two dimensional analysis is performed using the finite volume method with non-orthogonal and unstructured grid system. The standard
turbulence model is used. To investigate the recirculation phenomena, flow and temperature fields are calculated with three approaches such as, the distance between cooling tower and obstacle, the allocated geometrical type, and the effect of height of obstacle. In addition, the air-guide is considered in the current computation. The mean recirculation rate increases with the height of obstacle. The effect of air-guide to reduce the mean recirculation rate is obviously observed.
A System Operating Algorithm for the Effective Operation of a Multi-type Air-conditioning System
Han Do-Young ; Park Kwan-Jun ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 18, issue 7, 2006, Pages 587~595
A system operating algorithm was developed for the effective operation of a multi-type air-conditioning system. The system operating algorithm includes control algorithms for a safety mode, an initial operating mode, a stabilization mode, a fault diagnosis mode, an efficiency mode, and a tracking mode. Various tests were performed to show the effectiveness of these algorithms. Tests showed good results for the operation of a multi-type air-conditioning system. Therefore, these algorithms developed for this study may be used for the effective control of a multi-type air-conditioning system.
Ice Slurry Formation of a Solution in a Pressurized Plate Heat Exchanger
Lee Dong-Gyu ; Kim Byung-Seon ; Peck Jong-Hyeon ; Hong Hi-Ki ; Kang Chae-Dong ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 18, issue 7, 2006, Pages 596~602
Ice adhesion and blockage problems have been issued in continuous ice slurry making process. So we composed continuous ice slurry making device using a commercial small plate heat exchanger (PHX), and investigated character of ice formation. An experiment of ice formation was peformed with an aqueous solution of ethylene glycol 7 mass%. In the experiment, the effect of the pressurization on ice slurry formation during the cooling process was investigated. The pressurization test for the aqueous solution was performed by setting valves at the PHX inlet and outlet. At the results, the time of continuous ice formation increased as the pressure of the plate heat exchanger increased for cooling temperature of
. Also continuous ice formation at the cooling temperature of
showed a possibility. It was found that the pressurization may contribute to suppress the dissolution of supercooled aqueous solution in the PHX.
A Study on the Mitigation Schemes of Thermal Stratification Phenomenon in a Branch Piping
Park Man-Heung ; Kim Kwang-Chu ; Lee Seung-Chul ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 18, issue 7, 2006, Pages 603~611
A variety of schemes were sought for a mitigation of thermal stratification phenomenon in the branch piping of domestic nuclear power plant. Several mechanisms of thermal stratification occurrence were introduced in this paper. A number of factors were selected to find out the schemes for thermal stratification mitigation and the computational analysis were performed. The length of vertical branch piping, the diameter, the radius of curvature of the elbow, the direction of connection between main piping and branch piping, the slope of branch piping, the leakage flow rate, the installation of additional valve, the change of the 1st valve position and another branch piping connected with branch piping were mentioned as factors in this paper.