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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 21, Issue 12 - Dec 2009
Volume 21, Issue 11 - Nov 2009
Volume 21, Issue 10 - Oct 2009
Volume 21, Issue 9 - Sep 2009
Volume 21, Issue 8 - Aug 2009
Volume 21, Issue 7 - Jul 2009
Volume 21, Issue 6 - Jun 2009
Volume 21, Issue 5 - May 2009
Volume 21, Issue 4 - Apr 2009
Volume 21, Issue 3 - Mar 2009
Volume 21, Issue 2 - Feb 2009
Volume 21, Issue 1 - Jan 2009
Selecting the target year
Analysis on the Drying Performance with the Flow Rate of Circulation Air in a Heat Pump Dryer
Lee, Kong-Hoon ; Kim, Oak-Joong ; Lee, Sang-Ryoul ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 1, 2009, Pages 1~8
The simulation of a heat pump dryer has been carried out to figure out the effect of air flow rate on the drying performance represented by MER, SMER, and so on. The simulation includes the analyses of one-stage heat pump cycle and simple drying process using the drying efficiency. The heat pump cycle with Refrigerant 134a has been considered. In the dryer, some of drying air from the drying chamber flows through the heat pump system, the rest of air bypasses the heat pump system. The two air flows joins before the drying chamber inlet. The performance parameters considered in the present study are MER, SMER, the temperature and humidity of drying air. Those parameters are compared for different total air flow rate or bypass air flow rate.
Development of Simplified Building Energy Simulation Program for Building Energy Performance Analysis
Park, Jong-Il ; Kang, Yoon-Suk ; Ihm, Pyeong-Chan ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 1, 2009, Pages 9~15
There are various types of energy simulation tool to predict both thermal load and energy use. However, the problem about these software is that they have too much input variables and need expert with skills to run the simulation. Therefore, the purpose of this study is to develop the thermal analysis simulation program with input variables which eliminates coordinates of building components instead of using full coordinates by using DOE2. Since the simulation engine of the program is DOE2, the validity of S-DOE is performed by comparing peak heating and cooling load results with VisualDOE and annual energy use results with actual energy use of 1996. The results have shown that there are little difference between VisualDOE and S-DOE. Also it showed that there are little difference between actual energy use and S-DOE energy use results. S-DOE took less time to model a building than VisualDOE. These results reveals that the application of S-DOE have potentials in accurately predicting both energy load and energy use of the building and still have an advantage of taking less time to model a building.
Experimental Study on Characteristics of Evaporation Heat Transfer and Oil Effect of
Lee, Sang-Jae ; Kim, Dae-Hoon ; Choi, Jun-Young ; Lee, Jae-Heon ; Kwon, Young-Chul ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 1, 2009, Pages 16~22
In order to investigate
heat transfer coefficient and pressure drop by PAG oil concentration during
evaporation, the experiment on evaporation heat transfer characteristics in a mini-channels were performed. The experimental apparatus consisted of a test section, a DC power supply, a heater, a chiller, a mass flow meter, a pump and a measurement system. Experiment was conducted for various mass fluxes(
), heat fluxes(
) saturation temperatures(
), and PAG oil concentration(0, 3, 5wt%). The variation of the heat transfer coefficient was different according to the oil concentration. With the increase of the oil concentration, the evaporation heat transfer coefficient decreased and the delay of dryout by oil addition was found. Pressure drop increased with the increase of the oil concentration and heat flux, and the decrease of saturation temperature.
An Evaluation on Evacuation Safety in Training Facilities For Young People based on Fire and Evacuation Simulation
Chol, Chang-Ho ; Cho, Mm-Kwan ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 1, 2009, Pages 23~32
The Purpose for this study was to analyze the evacuation behavior of a training facilities for young people in case of fire emergency. It is necessary to study for fire safety design of the training facilities. The study carried out two different simulations on the training facilities. The results were divided into two groups by using Simulex, FDS. By comparing those two different outputs, we were able to verify the problems of existing training facilities. The results have shown that there was a need for a greater structural design in these training facilities.
An Experimental Study on the Pumping Characteristics of Diffuser/Nozzle Based Piezoelectric Micropumps with Different Geometries and Operating Conditions
Yong, Jung-Kwon ; Kim, Chang-Nyung ; Kim, Chin-Uck ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 1, 2009, Pages 33~40
In the present experimental study, the pumping performances of diffuser/nozzle based piezoelectric micropumps are estimated with different operating factors and geometries. Here, the effects of the input voltage and frequency on the pumping performances have been examined together with the influences of the positions of the inlet and outlet. The results show that the flow rate of the micropump is larger with larger input voltage with the largest flow rates for the frequency to be close to 6.0 Hz all through the current experimental study. Also, it has been found that the positions of the inlet and outlet affect much on the performance of the piezoelectric micropumps. Error estimation has been carried out for the evaluation of the pumping performance in association with the uncertainty of the measurement.
Thermal Characteristics of Under Ventilated Compartment Fire
Kim, Sung-Chan ; Hamins, Anthony ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 1, 2009, Pages 41~48
The present study has been performed to investigate the thermal characteristics of under-ventilated compartment fire which is a typical fire condition in structures. A series of fire experiments was conducted to characterize the thermally driven flow in a 2/5 scale ISO 9705 fire compartment. Three different fuels were used in this test series, methane gas, heptane pool, and polystyrene pellets fire. In order to measure accurate temperature, double shield aspirated thermocouples reducing the effect of radiative energy exchange on temperature measurement were used in addition to bare bead thermocouples. The upper layer temperature for well ventilated fire was increased with increasing heat release rate, but it was slightly decreased for under-ventilated fire. The measured temperatures in the upper layer at the front sampling location were higher than at the rear. Thermal characteristics through the doorway were also analysed for a wide range of heat release rates. This study provides a comprehensive and quantitative assessment of fire behavior for under-ventilation condition of fire.
A Research on the
Peak Point Control According to Ventilation Rate During Sleeping
Kim, Se-Hwan ; Kim, Dong-Gyu ; Park, Jong-Il ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 1, 2009, Pages 49~54
Ventilation requirement of apartment was mandated according to building equipment standards in 2006. When ventilation unit was considering for indoor air quality maintenance, we needed energy saving and efficiency ventilation control methods. This study carried out experiment of ventilation rate 0.7 adequacy. When we lived in apartment, we assumed that sleeping time was long stayed time in unconsciousness. Experiments carried out ventilation rate 0, 0.1, 0.4 and 0.7 in environment chamber from 22 o'clock to 06 o'clock, the concentration of
, temperature and humidity rate measured. Analyzing the results, conclusions are as follows. 1) When we sleep in bedroom, ventilation rate 0.4 meet the requirements of domestic legal standards. Conform fan of similarity law, ventilation rate 0.4 reduced power cost about 80% than 0.7. 2) In generally sleeping time 8 hours, peak point control reduced running time of ventilation unit about 43% than normal control.
Performance Analysis of Vane Rotary Expander for
Kim, Ho-Young ; Ahn, Jong-Min ; Kim, Hyun-Jin ; Cho, Sung-Oug ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 1, 2009, Pages 55~62
Relatively low cycle performance of a conventional
system is partly due to significant increase in friction loss in the expansion process, since the pressure drop across the expansion device is considerably large compared to a conventional refrigeration cycle. To recover friction loss and increase refrigeration effect by providing isentropic expansion, a rotary vane type expander has been designed. Performance of the designed expander has been investigated by numerical simulation. With the pressure condition of 9 MPa/4.5 MPa and inlet temperature of
, volumetric, isentropic, and mechanical efficiencies of the expander are calculated to be 58.1%, 101.1%, and 78.8%, respectively, resulting in total expander efficiency of 46.3%. With this expander, COP of a
refrigeration cycle is estimated to be improved by about 14%.
UV Immune System of Personalized Space
Jeong, Ky-Bum ; Choi, Sang-Gon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 1, 2009, Pages 63~70
The air sterilization systems are investigated experimentally in this paper. The goal is to reduce bacteria, mold and viruses in office air by using a UV sterilizer installed inside a partition panel and wall-mounted unit. These systems allow occupants to turn the system on/off and to control the incoming air speed and direction. The partition air sterilization system conditions and sterilizes the air, and then delivers the clean air into the personal task area through the partition panels, which are connected to the pressurized under-floor plenum. Room air exits through the return grills mounted on the ceiling. The wall-mounted air sterilization system sterilizes the air, and then delivers the clean air to the personal task area from the wall. In this study a full-size experimental environment is established to investigate the immunization performance of these air sterilization systems. A typical office space scale is used in this study in order to find an optimal system to achieve a sterilized healthy micro-environment. Multiple system parameters, including volume flow rate and velocity of supplied air, were regulated during the experiments. The more air contact these air sterilization systems had, the better disinfection performance. Over 90% of eradication ratios were obtained by these two air sterilization systems. The results indicate that these systems can efficiently disinfect office air contamination.