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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 25, Issue 12 - Dec 2013
Volume 25, Issue 11 - Nov 2013
Volume 25, Issue 10 - Oct 2013
Volume 25, Issue 9 - Sep 2013
Volume 25, Issue 8 - Aug 2013
Volume 25, Issue 7 - Jul 2013
Volume 25, Issue 6 - Jun 2013
Volume 25, Issue 5 - May 2013
Volume 25, Issue 4 - Apr 2013
Volume 25, Issue 3 - Mar 2013
Volume 25, Issue 2 - Feb 2013
Volume 25, Issue 1 - Jan 2013
Selecting the target year
The Condensation Risk Assessment of Vacuum Multi-Layer Glass and Triple Glass using the Temperature Difference Ratio
Won, Jong-Seo ; Nam, Jung-Woo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 11, 2013, Pages 573~577
DOI : 10.6110/KJACR.2013.25.11.573
An external window directly affects the energy performance of its building. In modern well-insulated buildings, U-values for walls of 0.36
or even lower can be realized. In such buildings, glazing with typical U-value of 2.1
or higher creates thermal weak spots on the facade. The performance of the existing triple glass window has been limited to energy savings and condensation prevention. In this study, the performance of condensation prevention of a vacuum multi-layer glass was analyzed. The final conclusion through mock-up experiments is as follows. The surface temperature of the vacuum multi-layer glass was
higher, and the temperature difference ratio (TDR) was 0.07 lower, than the corresponding values of the triple glass.
Performance Variation of the Refrigerated Display Case with Air Curtain in Accordance with Back Pressure Condition
Sung, Sun-Kyung ; Ahn, Kyo-Chul ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 11, 2013, Pages 578~584
DOI : 10.6110/KJACR.2013.25.11.578
Vertical open display cases are widely used in shopping malls, supermarkets, or retail stores to sell frozen and refrigerated products. Open display cases use air curtains to maintain a reasonable temperature within the storage space, prevent insects from breaking in, and reduce energy usage. In this research, computational fluid dynamics was used to find the optimal condition for reducing energy by considering various conditions such as discharge speed or temperature of air curtains. Results of the study showed that the amount of energy consumed in the display cabinet is influenced by the discharge speed and temperature of the slots installed on the upper area and the amount of air supplied to the storage area inside the shelf. This shows that the amount of discharged air supplied from the storage area influences the formation of air curtain and also the amount of energy consumption. As a result of this study, we learned that the amount of energy used can be reduced by increasing the amount of discharged air within the storage area and enhancing back pressure.
A Study on the Development of a Multi-Heat Supply Control Algorithm in a District Heating Apartment Building in Accordance with the Variation of Outdoor Air Temperature
Byun, Jae-Ki ; Yun, Sung-Ho ; Nam, Ki-Hoon ; Choi, Young-Don ; Sin, Jong-Geun ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 11, 2013, Pages 585~594
DOI : 10.6110/KJACR.2013.25.11.585
In this study, we developed a heat supply control algorithm that minimizes the heat loss in the heat distribution pipelines used for supplying heat energy to shared group housing. Controlling the temperature and flow rate of the hot water supplied to the heat exchanger for shared group housing enables us to develop a heat supply control technique that meets the heating load required by each household in a shared apartment building in accordance with changes in the outdoor air temperature, and that minimizes the heat loss occurring in the heat distribution pipeline. A one-year study in 2008 on a 1,473-household D-apartment building in Hwaseong, Gyeonggi-do, South Korea, compared the heat capacity used by each household, as well as the heat capacity supplied to the heat exchanger room of the apartment housing building, to calculate the amount of heat loss in the heat distribution pipeline. The results confirmed that 24.1% of the heat supplied was lost in the piping.
An Applicability Estimation of Plastic Vertical Pipes using Electric Fusion Fittings through Measurement
Park, Yool ; Ahn, Young-Chull ; Kim, Hyun-Dae ; Kim, Jeong-Su ; Goark, You-Shik ; Kim, Young-Kyoung ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 11, 2013, Pages 595~599
DOI : 10.6110/KJACR.2013.25.11.595
The pipes used in buildings are generally categorized into metallic or plastic materials. Metal pipes, such as copper and stainless steel pipes, are mainly used for water and hot water supply, and for the heating system. However, plastic pipes made of polyethylene and cross-linked polyethylene are used for floor heating, water drainage, and air vent systems. Usually, plastic pipes have thermal demerits, such as high linear expansion coefficients and bending phenomenon by hot water, although the pipes have several merits of light weight, low price, low thermal conductivity, and the comparatively high workability of metal pipes. Therefore, if those kind of demerits are overcome, plastic pipes can be easily accepted for hot water systems. This research is aimed to evaluate the applicability for vertical heating pipes of a plastic pipe system consisting of electric fusion fitting of a conductive carbon compound and propylene random glass fiber pipe, through measurement of the expansion rate and leakage in summer and winter seasons, in the apartment construction field.
An Economic Analysis and Performance Prediction for a Ground Heat Pump System with Barrette Pile
Chae, Ho-Byung ; Nam, Yujin ; Park, Yong-Boo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 11, 2013, Pages 600~605
DOI : 10.6110/KJACR.2013.25.11.600
Ground source heat pump systems (GSHP) can achieve higher performance of the system, by supplying more efficient heat source to the heat pump, than the conventional air-source heat pump system. But building clients and designers have hesitated to use GSHP systems, due to expensive initial cost, and uncertain economic feasibility. In order to reduce the initial cost, many researches have focused on the energy-pile system, using the structure of the building as a heat exchanger. Even though several experimental studies for the energy-pile system have been conducted, there was not enough data of quantitative evaluation with economic analysis and comprehensive analysis for the energy-pile. In this study, a prediction method has been developed for the energy pile system with barrette pile, using the ground heat transfer model and ground heat exchanger model. Moreover, a feasibility study for the energy pile system with barrette pile was conducted, by performance analysis and LCC assessment. As a result, it was found that the heat exchange rate of a barrette pile was 2.55 kW, and the payback period using LCC analysis was 8.8 years.
The Air Leakage Characteristics and Airtightness Performance of a Newly Built Apartment
Lee, Yun Gyu ; Shin, Cheol Woong ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 11, 2013, Pages 606~611
DOI : 10.6110/KJACR.2013.25.11.606
In responding to the recent framework convention on climate change, and the rise of the need for energy efficient buildings, such as Zero Energy Buildings (ZEB), domestic insulation standards and energy conservation regulations are being reinforced, to prevent heat loss. Accordingly, the Ministry of Land, Infrastructure and Transport have made amendments in Chapter 21 "Enforcement regulations for building facilities standards etc.", and Chapter 22 "Energy conservation standard", to reflect these changes. To effectively implement these regulations, it is required to propose air-tightness test methods, and establish air-tightness standards, based on the air leakage characteristics of domestic apartment housings. This research has been done primarily to collect basic technical data, to provide guidance for the establishment of domestic air-tightness standards for new apartment housing, through studying air-tightness test methods, field measurement on air-tightness of new apartment housings, and air leakage characteristics of major developed countries.
A Study on the Development of a Circular CAV Damper
Kwon, Youngpil ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 11, 2013, Pages 612~616
DOI : 10.6110/KJACR.2013.25.11.612
A circular CAV damper has been developed, based on the investigation of the pressure loss, and the flow-resisting moment by the damper blade. When a torsional spring is attached to the damper axle, and the setting angle is adjusted to around
, the volume rate across the damper is almost independent of the static pressure. Such a CAV characteristic appears at an opening angle between
, where the normalized moment decreases linearly with the angle. In addition, by adjusting the setting angle, the volume rate can be controlled to within 10% error, regardless of the pressure loss.
The Thermal Performance of Building Insulation Materials According to Long-Term Aging
Choi, Bo-Hye ; Kang, Jae-Sik ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 11, 2013, Pages 617~623
DOI : 10.6110/KJACR.2013.25.11.617
This study is to draw thermal property data during long-term aging, by testing the thermal conductivity of building insulation materials in Korea. The thermal resistance of extruded insulation within 3 days from manufacture performed well over the KS Standard. After 50 to 110 days, however, the thermal performance had deteriorated to the level of the KS standard. Eventually, after 4,000 days, the insulation performance had deteriorated to about 25.4~41.8% of the initial performance. Therefore, this research will be utilized as a reference for thermal properties during long-term aging, in order to improve standards and regulations related to building insulation materials.
The Discharge Performance Optimization of a Forced Convection Type PCM Refrigeration Module Used in a Refrigeration Truck
Lel, Xu ; Kim, Wonuk ; Lee, Sang-Ryoul ; Kim, Yongchan ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 11, 2013, Pages 624~630
DOI : 10.6110/KJACR.2013.25.11.624
A truck refrigeration system using phase change material (PCM) is expected to have a lower noise level, reduced energy cost, and much lower local greenhouse gas emission. Recently, a forced convection type PCM refrigeration module has been developed. As the operation time increases, the PCM around the air inlet melts, because of a large temperature difference between the PCM and air. Therefore, the latent heat transfer area decreases and the heat transfer rate of the module decreases even though there is a lot of PCM which does not melt around the air outlet. A computational fluid dynamic modeling of the PCM refrigeration module was developed and validated by the experiment. Using the CFD, the design parameters, such as the mass flow rate of the air and roughness of the slab, were investigated to improve the heat transfer inhomogeneity. As a result, the adoption of partial roughness on the slabs improved the heat transfer inhomogeneity and reduced a fan power.
A Study on the Rule Development for BIM-based Automatic Checking in a Duct System
Song, Jong-Kwan ; Cho, Geun-Ha ; Ju, Ki-Beom ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 11, 2013, Pages 631~639
DOI : 10.6110/KJACR.2013.25.11.631
This study derives quality checking items in Building Mechanical Systems Design Criteria, and suggests quality criteria to review BIM models in the duct system of an air conditioning system for rule-based automatic checking. First, components for the duct system of an air conditioning system were reviewed, and the quality checking items were drawn from Building Mechanical Systems Design Criteria, through assessment according to object, attribute and relationship composing the BIM model. Second, quality checking types were derived, by analyzing the quality checking items and Rule set of the Solibri Model Checker. Finally, methods of algorithm functioning for checking the BIM models for mechanical systems in computers were drawn, and Elements to comprise the quality checking criteria (rule) were suggested. This study means that that checking items are derived from domestic criteria, and a way for the development process of determining quality checking criteria (rules) is suggested.