• Title/Summary/Keyword: Heat Panel

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An Experimental Study and Transient Simulations of the Radiant Heating Floor Panel by Using Finite Difference Methods (유한차분법(有限差分法)을 이용한 온수온돌(溫水溫突) 바닥구조체(構造體)의 비정상(非正常) 열전달(熱傳達) 해석(解析)과 실험(實驗) 연구(硏究))

  • Sohn, J.Y.;Chung, K.S.;Park, B.Y.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.3 no.1
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    • pp.69-77
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    • 1991
  • "Ondol" have been used in residential buildings for several thousands years in Korea. The traditional "Ondol" heating system of Korea has changed into the radiant heating system with piping embedded in floors or slabs. This study reports the results of transient experiments performed on a radiant heating system and enclosure. The paper presents some details of the thermal response of slab-heated buildings to varying patterns of heat input. Furthermore, I'll compare the results of experimentation with the ones of the numerical simulation by using the explicit and implicit forms of the finite difference methods (FDM). The study has contributed to testify the feasibility of numerical analysis, and the understanding of the transient behavior of radiant heating panels and enclosure exposed to this type of heating system.

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The R&D of hot water production by the combination of solar thermal and a large sized flower cooling system(I) (꽃 저장용 냉장시스템과 태양열 복합형 급탕기 개발연구(I))

  • Jung, Hyun-Chai;Kim, Ki-Sun;Sun, Kyung-Ho
    • Solar Energy
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    • v.12 no.3
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    • pp.84-93
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    • 1992
  • Solar assisted heat pump with freon circulating system has been developed. Revising the cool chamber(flower storage) with the solar thermal hot water producing system, the more amount of hot water can be produced, which can be even used for room panel heating. The compressor was cooled by water jaket instead of air cooled so that the system energy efficiency was improved quite well.

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Analysis of HGAX Cycle for Reducing the Generator Temperature and Enhancing the Hot-Water Temperature (발생기 온도저감 및 고온열수 획득을 위한 Hybrid GAX 사이클 해석)

  • 강용태;윤희정;조현철
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.14 no.2
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    • pp.127-133
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    • 2002
  • The objectives of this paper are to develop an advanced GAX cycle named HGAX (Hybrid Generator Absorber heat exchanger) cycle, and to study the effect of key parameters on the cycle performance and the hot-water temperature from the condenser. New types of the HGAX cycle are developed by adding a compressor between the generator and the condenser- Type C (performance improvement and reduction of the generator temperature) and Type D (Hot-water temperature application). The solution temperature in the generator outlet is reduced to 168$^{\circ}C$ with the COP improvement of 19% compared to the standard GAX cycle. The hot-water temperature from the condenser is raised to 106$^{\circ}C$ for panel heating (Ondol heating) application.

Recent Issues of LED BLU (LED LCD TV)

  • Kim, Cha-Yeon
    • 한국정보디스플레이학회:학술대회논문집
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    • 2009.10a
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    • pp.71-71
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    • 2009
  • Recently several LCD TV makers including Samsung, LG and Sony actively have released LED LCD TV models on market. LED LCD TV is just which applied LED BLUs so that its color contrast ratio fairly enhance up to 1 million:1 and its thickness minimize to a few mm. Even this aspect seems somewhat to be each panel maker's strategies for prior market occupations on whole TV market. Without regard to the reasons, we do obviously meet a new era of technically advanced LCD TV. However we have still lots of problems or issues which we must overcome technically including LED chip/packaging process, secondary optics treatment, heat managements and cost reduction issues. Here I would like to forecast market volume and trend of LED LCD TV first and then discuss above almost of technical issues and suggest their possible solutions. Even these solutions looks better technologies and if they may increase production cost significantly, we will not prefer to choice that technology since lower cost policy can open the market. Finally I'm trying to suggest how well LED, as future light source, can apply to future LCD TV technologies.

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A Study on the Performance Analysis of Proportional Automatic Thermostatic Valves in Floor Radiant Heating System (바닥난방 시스템용 비례식 자동온도조절밸브의 성능해석에 관한 연구)

  • Song, Jae-Yeob;Ahn, Byung-Cheon;Kim, Yong-Ki;Lee, Tae-Won
    • Proceedings of the SAREK Conference
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    • 2007.11a
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    • pp.52-57
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    • 2007
  • The control characteristics for radiant panel heating system with automatic thermostatic valves were researched by computer simulation and experiment. The unsteady energy analysis using equivalent R-C circuit method and radiation heat transfer analysis of enclosure analysis method with simple structured rooms was performed. The results of flow rate changes of the simulation study are good fit with the ones of experimental one.

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The corrosion behavior of galvanized steel sheets at the cut edges (용융아연도금강판의 단면부 부식특성)

  • 남궁성;허보영
    • Journal of Surface Science and Engineering
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    • v.34 no.4
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    • pp.297-302
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    • 2001
  • As GA (Hot dip galvannealed steel sheet) has good corrosion resistance, weldability and paintability as well as excellent formability, it's demand is rapidly increasing for automotive panels. The GA coated layers are composed of several kinds of brittle Fe-Zn Metallic compounds which are susceptible to powdering during the press forming, however, very careful controls of manufacturing conditions such as galvannealing heat-treatment or bath composition are essential to meet with the required quality of automotive use. In this study the required characteristics of automotive panel are practically surveyed in detail and the appropriate manufacturing conditions of galvannealing or bath composition have experimentally investigated by using the various analyzing and simulating equipments. The result in this study indicated that the corrosion resistance at the cut edges was improved by increasing of coating weight and decreasing of thickness of sheet steels.

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Thermal-hydraulic behavior simulations of the reactor cavity cooling system (RCCS) experimental facility using Flownex

  • Marcos S. Sena;Yassin A. Hassan
    • Nuclear Engineering and Technology
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    • v.55 no.9
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    • pp.3320-3325
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    • 2023
  • The scaled water-cooled Reactor Cavity Cooling System (RCCS) experimental facility reproduces a passive safety feature to be implemented in Generation IV nuclear reactors. It keeps the reactor cavity and other internal structures in operational conditions by removing heat leakage from the reactor pressure vessel. The present work uses Flownex one-dimensional thermal-fluid code to model the facility and predict the experimental thermal-hydraulic behavior. Two representative steady-state cases defined by the bulk volumetric flow rate are simulated (Re = 2,409 and Re = 11,524). Results of the cavity outlet temperature, risers' temperature profile, and volumetric flow split in the cooling panel are also compared with the experimental data and RELAP system code simulations. The comparisons are in reasonable agreement with the previous studies, demonstrating the ability of Flownex to simulate the RCCS behavior. It is found that the low Re case of 2,409, temperature and flow split are evenly distributed across the risers. On the contrary, there's an asymmetry trend in both temperature and flow split distributions for the high Re case of 11,524.

A Study on the Energy Harvesting according to the porosity of Perforated Panel (타공 패널의 다공률에 따른 에너지 하베스팅에 관한 연구)

  • Park, Ha-Jun;Lee, Min-Hyup;Yoo, Moo-Young
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2023.11a
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    • pp.113-114
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    • 2023
  • As the available resources are gradually depleted, interest in renewable energy is increasing. Various energy harvesting technologies are emerging, and energy harvesting using solar, solar, and wind power is used in the highest range. Depending on the abnormal climate, solar heat and solar power differ in energy harvest, but the wind is fixed compared to the sun. Therefore, it was intended to maximize the effect of energy harvesting by using the venturi effect, which has a change in wind speed according to the turbine used for wind power generation and wind pressure. Therefore, in this paper, we want to see the difference in the amount of power generated by the turbine after increasing the wind speed using the venturi effect.

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Forecast on Internal Condensation at Balcony Ceiling of Super-high Apartment Building Faced with Open Air (외기에 면한 초고층 아파트 발코니 천정 내부결로 예측)

  • Choi Yoon-Ki;Ahn Jae-Bong
    • Korean Journal of Construction Engineering and Management
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    • v.4 no.4 s.16
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    • pp.155-163
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    • 2003
  • There are a growing number of cases to expand balconies of apartments faced with open air in order to enhance functional satisfaction and efficiency of dwelling space. In case of the balcony expansion at the floor, however, it is difficult to exclude a possibility of bringing about internal condensation due to the difference of temperature between indoor air and outdoor air caused by the Inflow of outer low-temperature air through the upper part of ceilings by failure in completely putting together the outer composite wall panels on the aluminum curtain walls installed at outer walls This study is to forecast possible occurrence of internal condensation around parapets and H-beam located at the inside of balcony ceilings on the uppermost floor of super-high apartment buildings faced with open air in order to provide dwellers with more comfortable environment in the related space and get rid of their uneasiness about the condensation. In this study, we estimated internal condensation, which vary in accordance with humidity pressure distribution, at curtain walls, stone panels or lower parts of slabs that constitute outer space of the residence and are weak against heat, through temperature forecast and temperature distribution interpretation program at normal two-dimension temperature

Integrity Evaluation of Railway Bogie Using Infrared Thermography Technique (적외선 열화상 기술을 이용한 철도차량 대차 건전성 평가)

  • Kim, Jeong-Guk
    • Journal of the Korean Society for Nondestructive Testing
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    • v.31 no.2
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    • pp.144-149
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    • 2011
  • The lock-in thermography was employed to evaluate the integrity of railway bogies. Prior to the actual application on railway bogies, in order to assess the detectability of known flaws, the calibration reference panel was prepared with various dimensions of artificial flaws. The panel was composed of structural steel, which was the same material with actual bogies. Through lock-in thermography evaluation, the optimal frequency of heat source was determined for the best flaw detection. Based on the defects information, the actual defect assessments on railway bogie were conducted with different types of railway bogies, which were used for the current operation. In summary, the defect assessment results with thermography method showed a good agreement as compared with the conventional inspection techniques. Moreover, it was found that the novel infrared thermography technique could be an effective way for the inspection and the detection of surface defects on bogies since the infrared thermography method provided rapid and non-contact mode for the investigation of railway bogies.