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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 23, Issue 12 - Dec 2011
Volume 23, Issue 11 - Nov 2011
Volume 23, Issue 10 - Oct 2011
Volume 23, Issue 9 - Sep 2011
Volume 23, Issue 8 - Aug 2011
Volume 23, Issue 7 - Jul 2011
Volume 23, Issue 6 - Jun 2011
Volume 23, Issue 5 - May 2011
Volume 23, Issue 4 - Apr 2011
Volume 23, Issue 3 - Mar 2011
Volume 23, Issue 2 - Feb 2011
Volume 23, Issue 1 - Jan 2011
Selecting the target year
Effect of Boundary Temperature Distributions on the Outlet Gas Composition of the Cylindrical Steam Reformer
Kim, Seok ; Han, Hun-Sik ; Kim, Seo-Young ; Hyun, Jae-Min ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 23, issue 6, 2011, Pages 383~391
DOI : 10.6110/KJACR.2011.23.6.383
Numerical simulations have been conducted for the cylindrical steam reformer having various boundary temperature distributions.
are often generated or destroyed by the reactions, namely the Steam Reofrming(SR) reaction, the Water-Gas Shift (WGS) reaction and the Direct Steam Reforming(DSR) reaction. The SR and the DSR reactions are endothermic reactions, and the WGS reaction is an exothermic reaction. The rate of reactions can be slightly controlled by artificially given boundary temperature distributions. Therefore, the component ratio of the gases at the outlet are different for various boundary temperature distributions, namely the constant, cubic and linear distributions. Among these distributions, the linear temperature distribution is outstanding for efficient hydrogen production of the steam reformer.
Performance Simulation of Ground-Coupled Heat Pump(GCHP) System for a Detached House
Sohn, Byong-Hu ; Choi, Jong-Min ; Choi, Hang-Seok ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 23, issue 6, 2011, Pages 392~399
DOI : 10.6110/KJACR.2011.23.6.392
Ground-coupled heat pump(GCHP) systems have been shown to be an environmentally-friendly, efficient alternative to traditional cooling and heating systems in both residential and commercial applications. Although some work related to performance evaluation of GCHP systems for commercial buildings has been done, relatively little has been reported on the residential applications. The aim of this study is to evaluate the cooling and heating performances of a vertical GCHP system applied to an artificial detached house(
) in Seoul. For this purpose, a typical design procedure was involved with a combination of design parameters such as building loads, heat pump capacity, borehole diameter, and ground thermal properties, etc. The cooling and heating performance simulation of the system was conducted with different prediction times of 8760 hours and 240 months. The performance characteristics including seasonal system COP, average annual power consumption, and temperature variations related to ground heat exchanger were calculated and compared.
Experimental Study on Heating Performance Characteristics of Air Source Heat Pump with Air to Water Type
Lee, Kwon-Jae ; Kwon, Young-Chul ; Chun, Chong-Keun ; Park, Sam-Jin ; Kwon, Jeong-Tae ; Huh, Cheol ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 23, issue 6, 2011, Pages 400~405
DOI : 10.6110/KJACR.2011.23.6.400
This paper presents the heating performance characteristics of the air source heat pump with air to water type. The heating capacity, COP, P-h diagram were measured at various operating conditions, air-side temperatures, relative humidities, and inlet/outlet water temperature under the standard heating condition of KS B 6275. The experimental data for the heat pump were measured using the air-enthalpy calorimeter and the constant temperature water bath. As the air-side temperature increases, the heating capacity and COP increase. The effect of the air-side relative humidities on the heat pump performance is insignificant. The heat pump performance on inlet and outlet water temperatures and air-side temperatures(-7, -11,
) were studied. Heating capacity and COP increased about 27~39% with the air-side temperature increasing. Enthalpy between the front and the rear of condenser decreased about 6% by increasing of the inlet water temperature. These results can be utilized in the design of the air source heat pump system with air to water type.
Present Situation and Analysis of Cold Storage Facilities for Fisheries Products
Son, Chang-Hyo ; Oh, Hoo-Kyu ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 23, issue 6, 2011, Pages 406~412
DOI : 10.6110/KJACR.2011.23.6.406
This paper describes the analysis on freeze and refrigeration capacity of cold storage facilities for fisheries products during the last 15 years. And based on the analysis results, we prospect the number and scale of cold storage facilities in the near future. The main analysis results are summarized by the followings; Under the present conditions, the number and scale of our facilities is 879 and 3,586,824 ton, respectively. In comparison of the present and last 15 years ago, the business number increases about 22%, the accommodation capacity increases approximately 80%. In the reported update reference with the related data during the last 15 years, the capacity of cold storage facilities in 2011 expects to reach up to 4,600,000 ton. The newlyestablished facility in 2011 has the function of a multi-purpose distribution center as well as the existing cold storage, but this facilities converges in the capital area. Therefore, in this paper, we provided the basic reference data for the present situation and prediction of our cold storage facilities. But it is necessary to investigate and analyse widely our cold storage facilities for fisheries products in the near future.
Thermal Analysis of a Combined Absorption Cycle of Cogeneration of Power and Cooling for Use of Low Temperature Source
Kim, Kyoung-Hoon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 23, issue 6, 2011, Pages 413~420
DOI : 10.6110/KJACR.2011.23.6.413
Thermodynamic cycles using binary mixtures as working fluids offer a high potential for utilization of low-temperature heat sources. This paper presents a thermodynamic performance analysis of Goswami cycle which was recently suggested to produce power and cooling simultaneously and combines the Rankine cycle and absorption refrigeration cycle by using ammoniawater mixture as working fluid. Effects of the system parameters such as concentration of ammonia and turbine inlet pressure on the system are parametrically investigated. Results show that refrigeration capacity or thermal efficiency has an optimum value with respect to ammonia concentration as well as to turbine inlet pressure.
A Study on Performance of Thermoelectric Air-Cooling System in Parallel Flow
Karng, Sarng-Woo ; Shin, Jae-Hoon ; Han, Hun-Sik ; Kim, Seo-Young ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 23, issue 6, 2011, Pages 421~429
DOI : 10.6110/KJACR.2011.23.6.421
Experimental and theoretical studies on cooling performance of two-channel thermoelectric air-cooling system in parallel flow are conducted. The effects of operating temperature to physical properties of thermoelectric module (TEM) are experimentally examined and used in the analysis of an air-cooling system considering thermal network and energy balance. The theoretical predicted temperature variation and cooling capacity are in good agreement with measured data, thereby validating analytic model. The heat absorbed rate increases with increasing the voltage input and decreasing thermal resistance of the system. The power consumption of TEM is linearly proportional to mean temperature differences due to variations of the physical properties on operation temperature of TEM. Furthermore thermal resistance of hot side has greater effects on cooling performance than that of cold side.
Performance and Applicability of PMV-based and TS-based Building Thermal Controls
Moon, Jin-Woo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 23, issue 6, 2011, Pages 430~440
DOI : 10.6110/KJACR.2011.23.6.430
The purpose of this study was to investigate the interactions between the thermal factors in existing thermal control methods and to find out the control logic that can create more comfortable thermal conditions. For it, four thermal control logics were developed：conventional temperature-based control; temperature-based and humidity-based control; PMV-based control; and TS-based control. Their performance was comparatively tested in the U.S. typical 5-story office building in two climate zones (Detroit, Michigan and Miami, Florida) for two seasons (winter and summer) incorporating IBPT (International Building Physics Toolbox) and Matlab/Simulink. Analysis on the thermal conditions and energy efficiency revealed that each control logic created comfortable conditions for their respective target, i.e., temperature, humidity, PMV or TS, but uncomfortable for others (e.g., temperature-based control logic maintained PMV or TS uncomfortably or vise versa). In addition, energy efficiency was significantly different by logics. In conclusion, it can be said that the overall thermal comfort can be improved by the adoption of the PMV and TS as a target variable and their economical benefits are expected in the hotter climate zones with the reduced cooling and dehumidifying energy consumptions.
The Supply Water Algorithm for a Condensing Gas Boiler Control
Han, Do-Young ; Yoo, Byeong-Kang ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 23, issue 6, 2011, Pages 441~448
DOI : 10.6110/KJACR.2011.23.6.441
The energy consumption of a condensing gas boiler may be greatly reduced by the effective operation of the unit. In this study, the supply water algorithm for a condensing gas boiler control was developed by using the fuzzy logic. This includes the supply water set temperature algorithm, and the control algorithms of a gas valve, a blower and a pump. For the set temperature algorithm, the outside air temperature and the return water temperature were used as input variables. The supply water temperature difference and its slope were used as input variables of the gas valve and blower control algorithm. And the supply water temperature and the return water temperature were used as input variables of the pump control algorithm. In order to analyse performances of these algorithms, the dynamic model of a condensing gas boiler was used. The initial start-up test, the supply water set temperature change test, the outside air temperature change test, and the return water temperature change test were performed. Simulation results showed that algorithms developed in this study may be practically applied for the effective control of a condensing gas boiler.
Recent Progress in Air-Conditioning and Refrigeration Research : A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2010
Han, Hwa-Taik ; Lee, Dae-Young ; Kim, Seo-Young ; Choi, Jong-Min ; Kim, Su-Min ; Kwon, Young-Chul ; Baik, Yong-Kyu ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 23, issue 6, 2011, Pages 449~469
DOI : 10.6110/KJACR.2011.23.6.449
This article reviews the papers published in the Korean Journal of Air-Conditioning and Refrigerating Engineering during 2010. 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 of thermal and fluid engineering have been surveyed as groups of general thermal and fluid flow, fluid machinery, and new and renewable energy. Various topics were presented in the field of general thermal and fluid flow. Research issues mainly focused on the thermal reliability of axial fan and compressor in the field of fluid machinery. Studies on the design of ground source heat pump systems and solar chemical reactors were executed in the field of new and renewable energy. (2) Research works on heat transfer area have been reviewed in the categories of heat transfer characteristics and industrial heat exchangers. Researches on heat transfer characteristics included heat transfer in thermoelectric cooling/power generation systems, combined heat and power systems, carbon nano fluid with PVP, channel filled with metal foam and smoke ventilation in a rescue station of a railroad tunnel. Also the studies on flow boiling of R123/oil mixture in a plain tube bundle and R410A charge amount in an air cooled mini-channel condenser were reported. In the area of industrial heat exchangers, researches on plate heat exchanger, shell and tube heat exchanger, enthalpy exchanger, micro channel PCHE were performed. (2) Research works on heat transfer area have been reviewed in the categories of heat transfer characteristics and industrial heat exchangers. Researches on heat transfer characteristics included heat transfer in thermoelectric cooling/power generation systems, combined heat and power systems, carbon nano fluid with PVP, channel filled with metal foam and smoke ventilation in a rescue station of a railroad tunnel. Also the studies on flow boiling of R123/oil mixture in a plain tube bundle and R410A charge amount in an air cooled mini-channel condenser were reported. In the area of industrial heat exchangers, researches on plate heat exchanger, shell and tube heat exchanger, enthalpy exchanger, micro channel PCHE were performed. (3) Refrigeration systems with alternative refrigerants such as hydrocarbons, mixed refrigerants, and CO2 were studied. Performance improvement of refrigeration systems are tried applying various ideas of refrigerant subcooling, dual evaporator with hot gas bypass control and feedforward control. The hybrid solar systems combining the solar collection devices with absorption chillers or compression heat pumps are simulated and studied experimentally as well to improve the understanding and the feasibility for actual applications. (4) Research trend in the field of mechanical building facilities has been found to be mainly focused on field applications rather than performance improvements. Various studies on heating and cooling systems, HVAC facilities, indoor air environments and energy resources were carried to improve the maintenance and management of building service equipments. In the field of heating and cooling systems, papers on a transformer cooling system, a combined heat and power, a slab thermal storage and a heat pump were reported. In the field of HVAC facilities, papers on a cooling load, an ondol and a drying were presented. Also, studies on HVAC systems using unutilized indoor air environments and energy resources such as air curtains, bioviolence, cleanrooms, ventilation, district heating, landfill gas were studied. (5) In the field of architectural environment and energy, studies of various purposes were conducted such as indoor environment, building energy, renewable energy and green building. In particular, renewable energy and building energy-related researches have mainly been studied reflecting the global interest. In addition, many researches which related the domestic green building certification of school building were performed to improve the indoor environment of school.
Improvement Plan of Mechanical System in Construction Industry Production Process
Park, Jong-Il ; Park, Ryul ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 23, issue 6, 2011, Pages 470~476
DOI : 10.6110/KJACR.2011.23.6.470
The aim of this paper is improvement plan of mechanical field construct production system in Korea construction industry market. Recently Korea's construction production system is changing rapidly. While change, mechanical system construction field must prepare proper system for construction production system and later mechanical construction work will give order directly. Through this study the author will show the improved mechanical field construct production system and it can useful future construction industry production system in Korea.