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임재한(Lim, Jae-Han),송승영(Song, Seung-Yeong),구보경(Koo, Bo-Kyoung) 한국건축친환경설비학회 2011 한국건축친환경설비학회 논문집 Vol.5 No.4
Recently the radiant panel heating and cooling system has been regarded as an alternative of low temperature heating and high temperature cooling by applying the renewable energy sources to the heating and cooling of buildings. Especially this system can be used as HVAC system alternatives in super high-rise buildings for energy saving and thermal comfort. Also it can be possible to reduce the plenum space because the minimum ventilation air will be supplied into the space. This study aimed at evaluating the basic characteristics of thermal output in light-weight radiant wall panel heating system. For this purpose, the thermal output of several light-weight radiant wall panel types were analysed by 3D dynamic heat transfer simulation. According to the supply water temperature, composition of panel layers and panel dimension, the thermal output characteristics such as surface temperature distribution, temperature difference between supply and return water were analyzed. The results show that we should improve the heat storage performance of wall panel for better distribution of surface temperature and thermal comfort.
6가 크롬 처리를 위한 알루미늄 산화물을 함유한 재생 분말 폐기물의 적용
임재우(Jae Woo Lim),김태환(Tae Hwan Kim),강형식(Hyung Sik Kang),김도선(Do Son Kim),김한선(Han Seon Kim),조석희(Seok Hee Cho),양재규(Jae Kyu Yang),장윤영(Yoon Young Chang) 大韓環境工學會 2009 대한환경공학회지 Vol.31 No.3
본 연구에서는 알루미늄 산화물을 함유한 재생 분말 폐기물에 의한 Cr(VI)의 제거특성을 조사하였다. 가공하지 않은 폐기물의 유기물을 제거하기 위해 550℃에서 소성하여 재생 분말 폐기물(RPW)을 준비하였다. 수용액 상에서 Cr(VI)의 흡착 경향에 관한 연구를 위해 회분식 반응장치를 이용하여 pH 변화, 흡착 속도, 등온 흡착 실험을 4가지 다른 이온세기 화학종(NO₃-, CO₃<sup>2-</sup>, SO₄<sup>2-</sup>, PO₄(3-))의 존재 하에서 수행하였다. SO₄<sup>2-</sup>와 PO₄(3-)가 존재할 때는 전체 pH 범위에서 크롬의 흡착이 크게 감소하였다. 반면 NO₃-와 CO₃<sup>2-</sup>에 의한 흡착 방해의 영향은 SO₄<sup>2-</sup>와 PO₄(3-)에 의한 것보다 상대적으로 낮았다. NO₃-와 CO₃<sup>2-</sup>의 존재 하에 Cr(VI) 흡착은 pH 4.5에서 최대로 나타났다. 이온세기 화학종의 농도가 증가함에 따라 Cr(VI)의 흡착은 감소하였다. 이러한 결과를 토대로 할 때 RPW와 Cr(VI) 사이의 흡착은 외부배위권 착물을 통하여 발생되는 것으로 사료된다. RPW에 의한 Cr(VI)의 흡착은 2차 반응으로 잘 표현되었다. Langmuir 등온흡착식을 이용하여 pH 3에서 RPW에 의한 Cr(VI)의 최대 흡착량을 구한결과 NO₃-, CO₃<sup>2-</sup>, SO₄<sup>2-</sup>, PO₄(3-)가 이온세기 화학종으로 있을 때 각각 11.1, 10, 3.33, 5 mg/g으로 얻어졌다. In this research, the removal capacity of Cr(VI) by the reused powdered wastes (RPW) containing aluminium oxides was studied. As a pre-treatment process for the preparation of calcined wastes, calcination was conducted at 550℃ to remove organic fraction in the raw wastes. In order to study the adsorption trend of Cr(VI) ions from aqueous solutions, the pH-edge adsorption, adsorption kinetic and adsorption isotherm were investigated using a batch reactor in the presence of four different background electrolytes(NO₃-, CO₃<sup>2-</sup>, SO₄<sup>2-</sup>, PO₄(3-)). Cr(VI) adsorption was greatly reduced in the presence of SO₄<sup>2-</sup> and PO₄(3-) over the entire pH range. Meanwhile the inhibition effect by NO₃- and CO₃<sup>2-</sup> was relatively lower than that by SO₄<sup>2-</sup> and PO₄(3-). Cr(VI) adsorption was maximum around pH 4.5 in the presence of NO₃- and CO₃<sup>2-</sup>. As the concentration of background electrolytes increased, Cr(VI) adsorption decreased. This result mightly suggests that adsorption between the surface of RPW and Cr(VI) occurs through outer-sphere complex. Cr(VI) adsorption onto the RPW was well described by second-order kinetics. From the Langmuir isotherm at initial pH 3, the maximum adsorbed amount of Cr(VI) onto the RPW was 11.1, 10, 3.3, 5 mg/g in the presence of NO₃-, CO₃<sup>2-</sup>, SO₄<sup>2-</sup>, and PO₄(3-), respectively.
차축발열검지를 위한 4픽셀 적외선 디텍터 광학계에 관한 연구
임재우(Jae-Woo Lim),최재식(Jae-Sik Choi),윤석한(Seok-Han Yoon),신진호(Jin-Ho Shin),임형태(Hyung-Tae Lim),곽수영(Soo-Young Kwak) 한국철도학회 2013 한국철도학회 학술발표대회논문집 Vol.2013 No.5
현재 국내에 설치된 HBD(차축발열검지장치, Hot Box Detector)는 고속열차의 차축에서 발생하는 온도 검지를 위해 적외선을 이용한 비접촉 온도측정방식을 사용하고 있다. 비접촉 온도측정방식은 움직이는 사물에 대한 온도측정과 같이 접촉식 온도센서로 측정이 불가능한 환경에서도 온도측정을 가능하게 해준다. 본 연구에서 사용하는 적외선 디텍터는 총 4 개 픽셀로 이루어진 적외선 검지센서들을 사용하여 4개의 포인트에서 발생되는 3 ~ 5㎛의 파장대역의 적외선을 검지함으로써 온도를 측정한다. 적외선 디텍터를 사용하여 차축의 발열을 검지하기 위해서는 발열체에서 발생하는 적외선을 센서에 집중시켜 줄 수 있는 전용 광학계를 필요로 한다. 본 논문에서는 차축발열검지를 위해 4 개의 픽셀로 이루어진 적외선 디텍터를 위한 광학계의 개발에 관하여 소개하고자 한다. HBD(Hot Box Detector), which is installed in Korea, applies non-contact temperature measuring methods using infrared rays to detect the temperature emitted from the axle box of highspeed trains. The non-contact temperature measuring methods make it available to check the temperature that is impossible to measure with a contact temperature sensor like gauging the temperature of moving objects. The infrared detector used in this study utilizes the detection sensors that have total 4 pixels and measures the temperature by detecting the infrared light in 3 ~ 5㎛ wavelength band, which is generated in 4 points. Therefore, the dedicated optical system that is able to concentrate the infrared rays from heating elements on the sensors is required to detect the heat of axle box with the infrared detector. In this research, the development of optical system for 4-pixels infrared detector will be introduced to detect the heat of axle box.
임재한(Lim, Jae-Han),윤미숙(Yoon, Mi-Sook),송승영(Song, Seung-Yeong) 한국건축친환경설비학회 2015 한국건축친환경설비학회 논문집 Vol.9 No.6
Generally residential kitchen hood has been used to remove the airborne grease, combustion products, fumes, smoke, odors, heat, and moisture from the air by evacuation of the air and filtration. This ventilation equipment is containing a mechanical exhaust fan that hangs above the stove or cooktop in the kitchen. Previous research indicates that kitchen hood use is infrequent mainly due to the noise problem. To solve this noise problem, it is necessary to analyze the sound level and characteristics of sound spectrum at first. The purpose of this study is to analyze noise characteristics of residential kitchen hood and to evaluate the noise criterion according to the dB(A), PSIL, NC, and NR. For this, in-depth interview with questionnaire was conducted for the better understanding of current operation status of kitchen hood. And field measurements of noise level were conducted at 15 cases in residential building. In results, sound pressure level is around 51.1~66.2dB(A). Sound pressure level on each frequency is irregular in the lower range and gradually decrease in the higher range.
거주자의 건물에너지 절약을 위한 건축물 에너지 소비량 정보 구축 및 활용 전략
임재한(Lim, Jae-Han),진혜선(Jin, Hye-Sun),최보혜(Choi, Bo-Hye),김성임(Kim, Sung-Im),송승영(Song, Seung-Yeong) 한국건축친환경설비학회 2015 한국건축친환경설비학회 논문집 Vol.9 No.2
The purpose of this paper is to deduct the scheme of construction related to the building end-use energy consumption associated with domestic integrated management system for building energy by analyzing various building energy consumption statistics and database. Although building officials can be considered as a direct influencing factor to reduce building energy consumption, they are just given information related to the primary or total energy consumption like gas or electricity and it has been mainly used for national political purposes. In some countries, however, building energy consumption database or related statistics are given as a form of end-use energy units including space-heating, space-cooling, hot-water supply, ventilation, lighting etc. Furthermore, by constructing standard end-use energy database, real energy consumption could be compared with the standard one and building owners could be given some guidelines to reduce building energy. By doing this, we can take part in the building energy preservation spontaneously.
상변화 물질을 이용한 구체축열 복사난방 공간의 실내 온열 환경 특성
임재한(Lim, Jae-Han) 한국건축친환경설비학회 2016 한국건축친환경설비학회 논문집 Vol.10 No.2
The purpose of this paper is to investigate room thermal environment of thermally activated building system (TABS) using phase change materials (PCMs) during heating operation. The mock-up scale experiments were carried out during heating operation with the TABS with PCMs. These experiments are focused on the evaluation of indoor thermal environment due to the latent heat storage technologies for proposed use in low-temperature heating for office buildings. We made a mock-up building with 4 test cells, in which there were installed three prototypes of TABS(Hot water pipe embedded within concrete slab (Type A), double pipe embedded within concrete slab (Type B) and double pipe embedded within 2-way hollow core slab (Type C)). We measured the supply water temperatures, return water temperatures, ceiling surface temperatures, vertical air temperatures, and globe temperatures. In results, it was found that the TABS applied to 2-way hollow core slab with PCM can have the similar changes of indoor thermal environment such as globe temperature changes and there is no thermal discomfort due to the vertical difference of air temperature, radiant asymmetry.
임재찬(Jae-Chan Lim),김재철(Jae-Chul Kim),한성호(Soung-ho Han),이수길(Su-Gil Lee) 한국조명·전기설비학회 2008 한국조명·전기설비학회 학술대회논문집 Vol.2008 No.10월
It’s essential to measure electrical signals of Korea tilting train ""Hanvit 200"" during operation, Because we neep to study operation characteristics of new electric train ""Hanvit 200"" and we want to develop diagnosis system of main circuit of Korea tilting train ""Hanvit 200"". So, we measure electrical signals for developing diagnosis system of ""Hanvit 200"" during operation. We measure voltage and current of the primary winding of main transformer and analyze them. In result, we know that each operation has specific waveform and frequency. In addition, we also measure are currents and are voltage and we know that arc of each situations has specific waveform of pattern.
가돌리늄(Gd) 첨가에 따른 1A 등급 듀플렉스 스테인레스 강의 미세조직 및 파괴 특성 변화
임재한 ( Jae Han Lim ),정현도 ( Hyun Do Jung ),안지호 ( Ji Ho Ahn ),문병문 ( Byung Moon Moon ) 한국주조공학회 2016 한국주조공학회지 Vol.36 No.1
CD4MCU duplex stainless steel with gadolinium was fabricated as a neutron absorbing material by the air induction melting method. The gadolinium formed intermetallic compounds of Cu-Gd-Fe. There were no significant differences in hardness or ultimate tensile strength between experimental alloys. With the addition of gadolinium the yield strength of the cast alloy significantly increased, from 478.8 ± 11.6 to 514.2 ± 29.9 MPa, whereas elongation of the cast alloy decreased with the addition of gadolinium, from 26.0 ± 7.1 to 7.0 ± 2.5% due to the formation of gadolinium based intermetallic compounds.