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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
Forced Convection Characteristics of V shape Circular fin-tube Heat Exchanger
Lee, Jong-Hwi ; Lim, Moo-Gi ; Kang, Hie-Chan ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 12, 2009, Pages 649~655
The purpose of the present study is to investigate the flow resistances and heat transfer characteristics of V-shaped circular fin-tube heat exchangers. Four types of V-shaped fins in which the fin areas are identical but the areas of the V-shaped portion are different have been tested numerically. The results obtained for heat transfer, pressure drop, and fin temperature are discussed in this paper. With increase in the area of the V-shaped portion, the pressure drop and heat transfer increase up to 40% and 24%, respectively, in the present test range.
Improvement of the Heat Resistance Reliability of an Axial Smoke Exhaust Fan
Hur, Jin-Huek ; Heo, Ki-Moo ; Moon, Seung-Jae ; Lee, Jae-Heon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 12, 2009, Pages 656~662
In this paper, the heat resistance reliability of an axial smoke exhaust fan was investigated. An axial smoke exhaust fan should be capable of operating at
for 2 hours. The heat resistance reliability was evaluated by the heat resistance reliability test. A B10 life with a 90% confidence level was estimated to be about 48 minute. The failure occurred in the motor due to high temperature. The main failure mechanisms of the motor were melting of bond and insulating paper and burning of insulating materials in the coil. The heat resistance reliability was improved by changing the way to unite the core and the coil and by replacing the insulating paper and the insulating materials of the coil. A B10 life with a 90% confidence level of a modified axial smoke exhaust fan was estimated to be over 120 minute.
Effect on Flow Boiling Heat Transfer of Minichannel Diameter for R-410A
Choi, Kwang-Il ; Pamitran, A.S. ; Oh, Jong-Taek ; Hrnjak, Pega ; Park, Chang-Yong ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 12, 2009, Pages 663~670
Two-phase flow boiling heat transfer of R-410A in horizontal small tubes was reported in the present experimental study. The local heat transfer coefficients were obtained over a heat flux range of 5 to 40 kW/
a mass flux range of 170 to 600 kg/
, a saturation temperature range of 3 to
, and quality up to 1.0. The test section was made of stainless steel tubes with inner diameters of 0.5 and 3.0 mm, and lengths of 330 and 3000 mm, respectively. The test section was heated uniformly by applying a direct electric current to the tubes. The effects on heat transfer of mass flux, heat flux, inner tube diameter, and saturation temperature were presented. The experimental heat transfer coefficients are compared with six existing heat transfer coefficient correlations. A new boiling heat transfer coefficients correlation based on the superposition model for R-410A in small tubes was developed with mean deviation of 10.13%.
A Study on Verification for the Design of Bio Safety Level 3 Laboratory by using Multi-zone Simulation
Lee, Hyun-Woo ; Choi, Sang-Gon ; Hong, Jin-Kwan ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 12, 2009, Pages 671~677
In Korea, since the implementation of the LMO Law, the interest of biosafety level 3(BL3) lab. is increasing. In this study, using CONTAM which is applying multizone modelling, the multizone simulation for design verification of BL3 lab. is performed. In BL3 lab., because required air change rate is greater than general estimated air-conditioning load and it is difficult to maintain room pressure difference efficiently, to maintain pressure difference between laboratory rooms is important through sealing condition of doors and proper airflow control of laboratory rooms. In this study, about BL3 lab,(M. tuberculosis research lab.), the multizone simulation for four kind of biohazard scenarios is carried out in the case of unexpected spread of contaminants in the laboratory room, anteroom, corridor and inside of BSC. Multizone simulation results show that these approach methods are used as a tool for the design and verification of BL3 lab.
A Study on the Water Resource and Environmental Pollution Level of Education Facilities in Green Building Certification Criteria
Kwag, Moon-Geun ; Choi, Chang-Ho ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 12, 2009, Pages 678~687
The purpose of this study is to develop the assessment category, items, a detail standard for environmentally friendly evaluation on the school. and to analyze the plan to improve the level of certification criteria on the School's water resource and environmental pollution. The results of this study brings on promoted environmentally friendly appreciation, resource con servation, reduction of contaminant, accordance in and around building, etc. For this purpose, analysis of domestic and foreign environmental friendly architectural citation screening system-BREEAM (1991), LEED 2.0(2001) etc.-was preceded, and through interview, survey and forum with professional group, developed evaluation item was verified and reappraised. Developed evaluation item were composed of 40 schools about water resource and environmental pollution.
A Study on the Energy Level of Education Facilities in Green Building Certification Criteria
Kwon, Young-Cheol ; Kwag, Moon-Geun ; Choi, Chang-Ho ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 12, 2009, Pages 688~694
With the increase in the demand for sustainable and environmentally-friendly development, Green Building Certification System came into force in 2002, Evaluation parts of Green Building Certification System are divided into land use and transportation, energy, ecological environment, and indoor environment. Alloted point for the part of energy is larger than other part, thus we can say that this part is very important to increase the green building performance. This study aims to analyze the present condition of design and construction for the part of energy in the certificated green school building. Total 40 certificated school buildings were selected and average scoring rate of each item was evaluated. Key particular to be considered were suggested to improve the item of energy consumption.
Dynamic Analysis of Single-Effect/Double-Lift Libr-Water Absorption System using Low-Temperature Hot Water
Kim, Byong-Joo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 12, 2009, Pages 695~702
Dynamic behavior of Libr-water absorption system using low-temperature hot water was investigated numerically. Thermal-hydraulic model of single-effect/double-lift 100 RT chiller was developed by applying transient conservation equations of total mass, Libr mass, energy and momentum to each component. Transient variations of system properties and transport variables were analysed during start-up operation. Numerical analysis were performed to quantify the effects of bulk concentration and part-load operation 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 bulk concentration was found to exist, which resulted in the minimum time constant with stable cooling capacity. COP and time constant increased as the load decreased down to 40%, below which the time constant increased abruptly and COP decreased as the load decreased further.
A Study on Performance Improvement Measures of Pressurized Smoke Control Systems for Exit Passageways of High-Rise Buildings
Son, Bong-Sae ; Kim, Jin-Soo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 12, 2009, Pages 703~714
One of the biggest problems in smoke control systems for high-rise buildings is stack effect, but there are no recognized methods or measures to solve the problem of stack effect as yet. The stack effect can be overcome by forming the uprising current inside the stair hall properly, but there is a limit to the height in supplying into the stair hall the smoke control air volume to be supplied to a floor in case of escape from fire. The limit to the height can be extended by over-coming the stack effect by pressurizing the stair hall and the ancillary room simultaneously. It can also be anticipated that the stack effect can be overcome by connecting the air supply shaft to the stair hall at the top. As a result of computer simulations using a network type of tool, it is found that adequate performance can be achieved by pressurizing the stair hall only for a building of 190m or less, and up to 360m when pressurizing the stair hall and the ancillary room simultaneously. In all those cases, however, an overpressure venting damper is required which operates within a suitable range for venting the overpressure outside.
Recent Progress in Air-Conditioning and Refrigeration Research: A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2008
Han, Hwa-Taik ; Choi, Chang-Ho ; Lee, Dae-Young ; Kim, Seo-Young ; Kwon, Yong-Il ; Choi, Jong-Min ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 21, issue 12, 2009, Pages 715~732
This article reviews the papers published in the Korean Journal of Air-Conditioning and Refrigeration Engineering during 2008. It is intended to understand the status of current research in the areas of heating, cooling, ventilation, sanitation, and indoor environments of buildings and plant facilities. Conclusions are as follows. (1) Research trends in thermal and fluid engineering have been surveyed in the categories of general fluid flow, fluid machinery and piping, new and renewable energy, and fire. Well-developed CFD technologies were widely applied in developing facilities and their systems. New research topics include fire, fuel cell, and solar energy. Research was mainly focused on flow distribution and optimization in the fields of fluid machinery and piping. Topics related to the development of fans and compressors had been popular, but were no longer investigated widely. Research papers on micro heat exchangers using nanofluids and micro pumps were also not presented during this period. There were some studies on thermal reliability and performance in the fields of new and renewable energy. Numerical simulations of smoke ventilation and the spread of fire were the main topics in the field of fire. (2) Research works on heat transfer presented in 2008 have been reviewed in the categories of heat transfer characteristics, industrial heat exchangers, and ground heat exchangers. Research on heat transfer characteristics included thermal transport in cryogenic vessels, dish solar collectors, radiative thermal reflectors, variable conductance heat pipes, and flow condensation and evaporation of refrigerants. In the area of industrial heat exchangers, examined are research on micro-channel plate heat exchangers, liquid cooled cold plates, fin-tube heat exchangers, and frost behavior of heat exchanger fins. Measurements on ground thermal conductivity and on the thermal diffusion characteristics of ground heat exchangers were reported. (3) In the field of refrigeration, many studies were presented on simultaneous heating and cooling heat pump systems. Switching between various operation modes and optimizing the refrigerant charge were considered in this research. Studies of heat pump systems using unutilized energy sources such as sewage water and river water were reported. Evaporative cooling was studied both theoretically and experimentally as a potential alternative to the conventional methods. (4) Research papers on building facilities have been reviewed and divided into studies on heat and cold sources, air conditioning and air cleaning, ventilation, automatic control of heat sources with piping systems, and sound reduction in hydraulic turbine dynamo rooms. In particular, considered were efficient and effective uses of energy resulting in reduced environmental pollution and operating costs. (5) In the field of building environments, many studies focused on health and comfort. Ventilation. system performance was considered to be important in improving indoor air conditions. Due to high oil prices, various tests were planned to examine building energy consumption and to cut life cycle costs.