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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 16, Issue 12 - Dec 2004
Volume 16, Issue 11 - Nov 2004
Volume 16, Issue 10 - Oct 2004
Volume 16, Issue 9 - Sep 2004
Volume 16, Issue 8 - Aug 2004
Volume 16, Issue 7 - Jul 2004
Volume 16, Issue 6 - Jun 2004
Volume 16, Issue 5 - May 2004
Volume 16, Issue 4 - Apr 2004
Volume 16, Issue 3 - Mar 2004
Volume 16, Issue 2 - Feb 2004
Volume 16, Issue 1 - Jan 2004
Selecting the target year
An Experimental Study on the Cooling Characteristics of an Infrared Detector Cryochamber
Kang Byung Ha ; Lee Jung Hoon ; Kim Ho-Young ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 889~894
Infrared (IR) detectors are widely used for many applications, such as temperature measurement, intruder and fire detection, robotics and industrial equipment, thermoelstic stress analysis, medical diagnostics, and chemical analysis. Quantum detectors commonly need to be refrigerated below 80 K, and thus a cooling system should be equipped together with the detector system. The cooling load, which should be removed by the cooling system to maintain the nominal operating temperature of the detector, critically depends on the insulation efficiency of the cryochamber housing the detector. Thermal analysis of cryochamber includes the conduction heat transfer through a cold well, the gases conduction and gas outgassing, as well as radiation heat transfer, The transient cooling characteristics of an infrared detector cryochamber are investigated experimentally in the present study. The transient cooling load increases as the gas pressure is increased. Gas pressure becomes significant as the cooling process proceeds. Cool down time is also increased as the gas pressure is increased. It is also found that natural convection effects on cool down time become significant when the gas pressure is increased.
A Generalized Flow Model and Flow Charts for Predicting Mass Flow Rate through Short Tube Orifices
Choi Jong Min ; Kim Yongchan ; Kwak Jae Su ; Kwon Byong Cheol ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 895~900
With the phaseout of CFC and HCFC refrigerants, refrigeration and heat pump systems must be redesigned to match and improve system performance with alternative refrigerants. A generalized flow model for predicting mass flow rate through short tube orifices is derived from a power law form of dimensionless parameters generated by Pi-theorem. The database for developing the correlation includes extensive experimental data for R12, R22, R134a, R407C, R410A, and R502 from the open literature. The correlation yields an average deviation of
and a standard deviation of
based on the present database. In addition, rating charts for predicting refrigerant flow rate through short tube orifices are generated for R12, R22, R134a, R407C, R410A, and R502.
A Study on the Collection Characteristics of a Moving Electrode Electrostatic Precipitator - I. Effect of Collection Plate Velocity -
Kim Yong-Jin ; Ha Byung-Kil ; Jeong Sang-Hyun ; Moon Sang-Cheol ; Yoo Joo-Sik ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 901~907
This study investigate the effect of collection plate velocity on the electrical and collection characteristics of a moving electrode electrostatic precipitator (MEEP). Though a high resistivity fly ash is attached at the collecting electrode, the MEEP has very stable characteristics of voltage and corona current. Collection efficiency, corona current, and overall collection efficiency are increased, as the magnitude of the collection plate velocity increases.
A Study on the Collection Characteristics of a Moving Electrode Electrostatic Precipitator - II. Effect of Wave Form of Pulse Energization and Dust Concentration -
Kim Yong-Jin ; Ha Byung-Kil ; Jeong Sang-Hyun ; Hong Won-Seok ; Yoo Joo-Sik ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 908~913
This study investigates the effect of the wave form of pulse energization and dust concentration on the collection characteristics of a moving electrode electrostatic precipitator (MEEP). Under the same specific corona power, the collection efficiency of the MEEP for the lower dust concentration (
) becomes higher than that for the higher concentration (
). Both the collection efficiency and specific corona power increase with increasing pulse period for the same value of applied voltage. The collection efficiency of MEEP is higher than that of the conventional fixed plate electrode electrostatic precipitator.
Measurement and Analysis of Energy Consumption of HVAC Equipment of a Research Building
Kim Seong-Sil ; Kim Youngil ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 914~922
In this study, measurement and analysis of energy consumption of a research building have been conducted. The energy audit procedure includes monitoring of electricity and LNG consumption over a period of three yews from 2000 to 2002. Data acquisition system for collecting energy consumption data of HVAC equipment such as chillers, fan filter units, AHUs, cooling towers, boilers, pumps, fan coil units, air compressors and etc. has been installed in a building located in Seoul. Data collected at an interval of 1 minute are analyzed for studying the energy consumption pattern of a research building. Percentage of energy consumption of all HVAC equipment is
in 2001, and
in 2002, respectively. Electricity consumption of chillers accounts for
of the total energy consumption, which is the largest. Annual energy consumption-rate per unit area is
in 2001, and
year 2002, respectively.
Development of Freeze Drying Analysis Program using Fixed Grid
Nam Jin Hyun ; Song Chi Sung ; Kim Charn-Jung ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 923~931
A multi-dimensional freeze drying analysis program, which took simultaneous heat and mass transfer, sublimation of ice and motion of sublimation front into full account, was developed using finite volume method with fixed grid. The effect due to the motion of sublimation interface was modeled by an enthalpy formulation streamlined for the freeze drying problems. The efficiency and accuracy of the program was validated by solving one- and two-dimensional freeze drying problems frequently encountered in industrial processes. Finally, the freeze drying processes of cylinder and slab objects with permeable side surfaces were simulated, which demonstrated the capability of the present analysis program in solving multi-dimensional freeze drying problems with complex sublimation interface configurations.
An Experimental Study on Multi-Fault Detection and Diagnosis Analysis of HVAC System
Cho Sung-Hwan ; Hong Young-Ju ; Yang Hooncheul ; Ahn Byung-Cheon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 932~941
The objective of this study is to detect the multi-fault of HVAC system using a new pattern classification technique. To classify the effect of single-fault in determining the pattern, supply air temperature, OA-damper, supply fan, and air flowrate were chosen as experimental parameters. The combination of supply temperature, flow rate, supply fan and OA-damper were chosen as multi-fault conditions. Three kinds of patterns were introduced in the analysis of multi-fault problem. To solve multi-fault problem, the new pattern classification technique using residual ratio analysis was introduced to detect the multi-fault as well as single-fault. The residual ratio could diagnose single-fault or multi-fault into several patterns.
Effect of Radiation on Laminar Film Boiling of Binary Mixtures
Seong Hyeon-Chan ; Kim Kyoung-Hoon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 942~951
This paper presents the results of a theoretical study of the effect of radiation during free convective laminar film boiling for methanol/water binary mixtures on an isothermal vertical wall at atmospheric pressure. With the well-known boundary layer theory as a basis, a theoretical model has been formulated into consideration for mass diffusion at liquid phase. The equations are numerically solved by a similarity method to investigate the effects of radiation emissivity on the surface with various parameters such as wall superheat and composition of more volatile component at liquid phase far from the wall. From the results, the distributions of the physical quantifies are investigated in both phases. New correlations are proposed to predict the heat transfer coefficient of binary mixtures. It is shown that the proposed correlations are in good agreement with numerical results and with Bromley's correlation within maximum
errors. It is also found that as the wall superheat is increased, radiation effect becomes more important.
Study on the Energy Efficiency Improvement of Hybrid Dehumidification Air Conditioning System Compared with Refrigeration System
Lee Su-Dong ; Park Moon-Soo ; Chung Jin-Eun ; Choi Young-Seok ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 952~959
The hybrid liquid desiccant air conditioning system has been in use for many years, primarily in industrial process applications requiring dehumidification and humidity control. In this study, the hybrid dehumidifier has been designed to study the dehumidification characteristic of the aqueous triethylene glycol (TEG) solution. The experimental results show energy efficient characteristics of hybrid liquid desiccant air conditioning system compared with the refrigeration system in terms of energy use, the difference of pressure loss between hybrid liquid desiccant air conditioning system and refrigeration system. Data obtained are useful for design guidance and performance analysis of the hybrid air conditioning system.
An Analysis of Demand for Environmental Controls on Different Residential Building Types
Leigh Seung-Bok ; Won Jong-Seo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 960~968
One of the most important functions of a building is to provide thermally comfortable indoor environmental conditions for the occupants. Therefore, a great deal of energy is consumed for heating and cooling to satisfy those thermal requirements. In order to provide thermal comfort with minimum heating and cooling energy consumption, optimal design of building affecting indoor climate is required. This study used the TRNSYS for modeling and simulation of the energy flows of residential building types, and examined the energy efficient measures to reduce the thermal loads. The residential building types are classified into the detached house, apartment house and high-rise residential complex. The results of the simulation show that the heating energy consumption in the detached house is especially high, whereas the cooling load is an important determinant in the apartment house and high-rise residential complex. The measures examined are the insulation thickness, various types of glazing, infiltration, natural and controlled ventilation, solar shading, orientation and etc. Comparative evaluations and sensitivity analyses revealed the effects of these variables and identified their energy efficient building design strategies.
Design and Implementation of Optimal Control Algorithms for Building Energy Management
Jin Jung-Hwa ; Chung Sun-Tae ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 969~976
Building energy saving is one of the most important issues in these days. Energy saving control strategies should be developed properly to achieve the saving. One of such area we could apply is the HVAC (Heating, Ventilation and Air-Conditioning) system. Through the optimal control algorithm for building energy management system (EMS), you can not only save the cost of building energy, but also protect HVAC system components against the unexpected condition. In order to verify the effectiveness of building energy saving, field test was accomplished for several months at 'A' building. And to get the measured data, remote control was used. If the remote control is used in BAS (Building Automation System), control and monitoring can be done for all of the building systems, such as HVAC, power, lighting, security and fire-alarm etc. anywhere any time. Using the remote control, Control and monitoring is possible for the testing system without going there. As the results of field test, we could reduce
of the building energy cost.
Boiling Heat Transfer in a Narrow Rectangular Channel with Offset Strip Fins
Kim Byong Joo ; Jeong Eun Soo ; Sohn Byong Hu ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 977~983
An experimental study on saturated flow boiling heat transfer of R113 was peformed in a vertical narrow rectangular channel with offset strip fins. Two-phase pressure gradients and boiling heat transfer coefficients in an electrically heated test section were measured in the range of quality
, mass flux
, and heat flux of
Two-phase friction multipliers were determined as a function of Lockhart-Martinelli parameter. Local boiling heat transfer coefficients were analysed in terms of mass flux, heat flux and local vapor quality. Correlation for boiling heat transfer coefficients was proposed, which was in good agreement with experimental data.
Study on Thermal Property in Urban Area - Part 1 : Experimental Analysis for Predicting Methodology of Thermal Property in Urban Area -
Son Won-Tug ; Lee Sung ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 984~989
Significant air temperature increases in urban areas is well known as the heat island phenomenon in a global scale. Therefore, we propose numerical model in order to analyze quantitative effects of building environmental factors on the heat island phenomenon in urban area. In this paper, thermal property of upper atmosphere is experimentally investigated for Sakae, Nagoya Japan. In conclusion, it was confirmed that the boundary layer of a urban canopy existed near the altitude of 139 m.
Dynamic Analysis of an Ammonia-Water Absorption Chiller
Kim Byong Joo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 16, issue 10, 2004, Pages 990~998
Dynamic behavior of an ammonia-water absorption system was investigated numerically. Thermal-hydraulic model for a single-effect 3 RT chiller was developed by applying transient conservation equations of total mass,
mass, energy and momentum to each component. Transient variations of system properties and transport variables were analysed during start-up operation. Numerical analyses were performed to quantify the effects of bulk concentration and charging ratio on the system performance in terms of cooling capacity, coefficient of performance, and time constant of system. For an absorption chiller considered in the present study, optimum charging ratio and bulk concentration were to found to exist, which resulted in the maximum cooling capacity and COP. The time constant increased as the charging ratio increased, but decreased with the increase of bulk concentration.