Go to the main menu
Skip to content
Go to bottom
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
Numerical Analysis of the Effect of Ground Source Heat Pump Systems on the Underground Temperature
Nam, Yujin ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 8, 2013, Pages 427~431
DOI : 10.6110/KJACR.2013.25.8.427
Ground heat pump systems utilize the annually stable underground temperature to supply heat for space heating and cooling. The underground temperature affects not only the underground ecosystem, but also the performance of these systems. However, in spite of the widespread use of these systems, there have been few researches on the effect of the systems on underground temperature. In this research, case studies with numerical simulation have been conducted, in order to estimate the effect of ground heat pump systems on underground temperature. The simulation was coupled with the ground water-ground heat transfer model and the ground surface heat transfer model. In the result, it was found that the underground change depends on the heat transfer from the ground surface, the heat exchange rate, and the heat conductivity of soil.
Preparation of Shape Stabilized PCM Using Porous Materials for Application to Buildings
Jeong, Su-Gwang ; Yu, Seulgi ; Jang, Seulae ; Park, Jin-Sung ; Kim, Taehyun ; Lee, Jeong-Hun ; Kim, Sumin ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 8, 2013, Pages 432~437
DOI : 10.6110/KJACR.2013.25.8.432
The increase of greenhouse gas emission and decrease of fossil fuel are being caused by the indiscreet consumption of energy by people. Recently, green policy has been globally implemented to reduce energy consumption. This paper studied the research to reduce the energy consumption in buildings, by using the heat storage properties of PCM. PCM has to prevent leakage from the liquid state. Therefore, we prepared form stable PCM, by using the vacuum impregnation method. Three kinds of organic PCMs were impregnated into the structure of porous material. The characteristics of the composites were determined by using SEM, DSC, FTIR and TGA. SEM morphology showed the micro structure of silica fume/PCM. Also, thermal properties were examined by DSC and TGA analyses; and the chemical bonding of the composite was determined by FTIR analysis.
A Study on the Reliability of Cooling Water Systems Using R436B
Nam, Hyun-Kyu ; Bai, Sangeun ; Bai, Cheol-Ho ; Ko, Jung-Su ; Jin, Byung-Joo ; Oh, Ju-Chul ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 8, 2013, Pages 438~442
DOI : 10.6110/KJACR.2013.25.8.438
The alternative refrigerant R436B is applied, to assess the application feasibility for a commercial cooling water system. The characteristic stability was verified by Sealed glass tube test and Autoclave test. R436B is chemically stable with the compressor material. The Oil miscibility test shows the usual compressor oil mixed well with R436B. Through the life acceleration test, the cooling performance is maintained. Though slight changes in oil and capillary tube diameter were found, they were within the permitted range. R436B should be applied to commercial cooling water systems as a simple replacement for the usual refrigerant.
An Experimental Study on Variable-Speed Control of an Ground-Water Circulation Pump for a Ground Source Multi-Heat Pump System
Song, Suwon ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 8, 2013, Pages 443~449
DOI : 10.6110/KJACR.2013.25.8.443
The purpose of this study is to propose an enhanced variable-speed control method of ground-water circulation pumps using inlet and outlet ground-water temperature difference and analyze its effect for the ground source multi-heat pump system installed in a single-family house. As a result, it has shown to significantly reduce the electricity use of ground-water circulation pump and improve overall system Coefficient of Performance (COP) due to the proposed variable-speed control under partial load conditions after oversized and inefficient single-speed pump retrofit.
Study on the Internal Flow of an Electric Oven with Variation of Steam Outlet Position
Park, Young Hun ; Kim, Yu Jin ; Jung, Young Man ; Park, Warn-Gyu ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 8, 2013, Pages 450~456
DOI : 10.6110/KJACR.2013.25.8.450
The composite electric oven is one of the fixing utensil, various functions are required. Steam generating function, which is one of its functions, and allows various food cooking. The location of the outlet of the steam generator is designed around ease of installation, consideration of internal fluid is not. Distribution of the steam can not be non-uniformly. Accordingly, cooking time becomes longer, the energy consumption increases. As a result of the analysis, it was confirmed stagnation phenomenon of the internal flow through the interpretation of the calculations for the position of the outlet of the steam generator existing. Further, by computing the analysis of various locations of the outlet of the steam generator, we investigated the distribution and characteristics of the internal flow.
Numerical Analysis of the Heat and Mass Transfer in a Fin Tube Type Adsorber
Kwon, Oh Kyung ; Chung, Jae Dong ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 8, 2013, Pages 457~463
DOI : 10.6110/KJACR.2013.25.8.457
Nowadays, adsorption chillers have been receiving considerable attention, as they are energy saving and environmentally benign systems. A fin tube type heat exchanger in which adsorption/desorption takes place is required with more compact size. The adsorption chiller is expected to have high energy efficiency in utilizing the waste heat exhausted from a process. The objectives of this paper are to scrutinize the effect of design parameters on the adsorption performance, especially the fin pitch of the fin tube, and to develop an optimal design fin tube heat exchanger in a silica gel/water adsorption chiller. From the numerical results, the fin pitch of 2.5 mm shows the highest adsorption rate, compared to other fin pitches, such as 5 mm, 7.5 mm and 10mm. Also, the adsorption rate is affected by the cooling water and hot water temperature.
Development of a Renewable Energy Facility Design and Its Simulation Case Study
Shin, Younggy ; Kim, Eun Joo ; Kim, Tae Hyung ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 8, 2013, Pages 464~470
DOI : 10.6110/KJACR.2013.25.8.464
Economic feasibility was conducted regarding the regulation that dictates obligatory installation of renewable energy facilities in small proportion. A concern is how to allocate the capacities of candidate facilities (solar collectors, PV cells and geothermal heat pumps) with minimum cost, and meet the obligatory energy supply proportion. A design rule has been developed, with which a designer can tune his or her design strategy between installation cost and LCC. This was derived mainly from documents regarding the KEMCO installation guide. It was concluded that PV was the cheapest, with respect to installation cost, but a geothermal heat pump was the most recommended, when LCC was also taken into account. The proposed design result was also confirmed, by simulation results obtained from Energy Plus.
A Study on the Heat Flux Meter Location for the Performance Test of a Refrigerator Vacuum Insulation Panel
Ha, Ji Soo ;
Korean Journal of Air-Conditioning and Refrigeration Engineering, volume 25, issue 8, 2013, Pages 471~476
DOI : 10.6110/KJACR.2013.25.8.471
The present study has been carried out to elucidate the optimal method for the performance test of a refrigerator vacuum insulation panel (VIP), by using numerical heat transfer analysis. Three locations of heat flux meter have been tested, for deriving the best test method to clarify the normal or the abnormal condition of the vacuum insulation panel in a refrigerator. The first location of the heat flux sensor is at the same place as the heater, the second one is at the nearby side location of the heater and the third one is at the opposite side location of heater in the refrigerator. The heat flux and
were calculated for the cases with the normal VIP, and with the abnormal VIP, and their differences analyzed. From the present study, the first and the second method had a mere difference characteristics of heat flux and
, between the cases with the normal or the abnormal VIP. The magnitude of the heat flux after 300sec had a great difference between the cases with the normal or abnormal VIP for the third method, and it could be considered the most optimal method to test the performance of a refrigerator vacuum insulation panel.