• 전기전자학회논문지
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• 제25권2호
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• pp.267-272
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• 2021

최근 화석에너지 고갈 및 환경 문제 해결을 위하여 신재생에너지와 탄소중립에 관한 관심이 집중되고 있다. 또한, 도시 건물의 고층화와 건물의 증가에 따른 건물에너지의 증가가 급속하게 되고 있다. 도시의 중심에 신재셍에너지원인 태양광 발전을 설치하는데 있어서 많은 제약사항이 있으며, 건물의 고층화가 됨에 따라 그늘이 형성되는 저조도 환경이 많이 발생하게 된다. 따라서 본 연구에서는 실외의 저조도 환경 및 실내의 조명 환경에서 전력발생이 가능한 발전소자를 개발하고자 한다. 저조도 환경에서의 발전소자는 태양전지의 종류중에 하나인 염료감응형 태양전지를 활용하고자 한다. 염료감응형 태양전지의 단위셀과 20cm×20cm 모듈을 제작하였고, LED, 할로겐램프, 3파장 램프의 광원을 활용하여 발전소자의 전기적 특성을 측정하였다. 단위셀의 광전변환효율은 LED, 할로겐 램프, 3파장 램프별로 17.2%, 1.28%, 19,2%로의 결과를 나타냈으며 20cm×20cm 모듈의 광전변환효율은 각각 10.9%, 8.7%, 11.8%의 결과를 나타내었다. 또한 모듈의 최대전력값은 광원별로 각각 13.1mW, 15.7 mW, 14.2 mW로서 저조도 환경에서 발전 가능성을 확인하였다.

• Journal of the Korean Wood Science and Technology
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• 제38권6호
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• pp.518-525
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• 2010

적외선 열화상 기술은 물체의 표면에서 방사되는 적외선을 검출하여 그 물체의 표면온도 분포를 나타내는 기술로서 물체의 내부 상태도 간접적으로 표현할 수 있다. 이 기술은 광범위한 분야에서 피사체의 물리적 손상이 허락되지 않을 경우 사용되고 있다. 본 실험에서는 "적외선 촬영법에 의한 건축물 단열 성능 평가 방법"(KS F2829)에 의거하여 결함부위 온도차 비율법(TDR : Temperature Difference Ratio)라는 지표로 국립산림과학원내 목조주택의 단열성능을 평가하였다. 실험을 위한 공간을 목조주택의 2층 방으로 정하고 적외선 카메라로 방의 실내와 실외의 표면온도를 측정하였다. 열화상 이미지를 이용하여 모서리 부분과 창을 통한 열손실을 정량적으로 파악할 수 있었으며 육안으로 확인 불가능한 열손실 결함부위를 탐지할 수 있었다. 이를 바탕으로 기존목조주택의 열환경성능 제고를 위한 개 보수시 도움이 될 것으로 기대된다.

• Bulletin of the Korean Chemical Society
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• 제35권5호
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• pp.1485-1490
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• 2014

We have designed and developed a new ladder type tetrafused ${\pi}$-conjugated building block such as dihydroindolo[3,2-b]indole (DINI) and investigated its role as an electron rich unit. The photovoltaic properties of a new semiconducting ${\pi}$-conjugated polymer, poly[[5,10-bisoctyl-5,10-dihydroindolo[3,2-b]indole-[5,6- bis(octyloxy)-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole]], represented by PDINI-OBTC8 are described. The new polymer PDINI-OBTC8 was synthesized in donor-acceptor (D-A) fashion, where fused ${\pi}$-conjugated tetracyclic DINI, and 5,6-bis(octyloxy)-4,7-di(thiophen-2-yl) benzo[c][1,2,5]thiadiazole (OBTC8) were employed as electron rich (donor) and electron deficient (acceptor) moieties, respectively. The conventional bulk heterojunction (BHJ) device structure ITO/PEDOT:PSS/PDINI-OBTC8:PCB71M/LiF/Al was utilized to fabricate polymer solar cells (PSCs), which comprises the blend of PDINI-OBTC8 and [6,6]-phenyl-$C_{71}$-butyric acid methyl ester ($PC_{71}BM$) in BHJ network. A BHJ PSC that contain PDINI-OBTC8 delivered power conversion efficiency (PCE) value of 1.68% with 1 vol% of 1,8-diidooctane (DIO) under the illumination of A.M 1.5G 100 $mW/cm^2$.

• 설비공학논문집
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• 제20권4호
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• pp.274-279
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• 2008

In the perspective of saving energy in buildings, high performance of insulation and air tightness for improving the heating and the cooling efficiency has brought the positive effect in an economical view. However, these building energy saving technologies cause the lack of ventilation, which is the direct cause of increasing the indoor contaminants, and it is also very harmful to residents because they spend over 90% of their time in the indoor area. Therefore, the ventilation is important to keep indoor environment clean and it can also save energy consumption. In this study, a HEPA type breathing wall is designed as a passive ventilation system to collect airborne particles and to supply fresh outdoor air. To make fine porous structures, polymer nano fibers which were made by electro spinning method are used as a precursor. The nano fibers are coated with SiO2 nano particles and finally the HEPA type breathing wall is made by sintering in the electric furnace at $300\sim500^{\circ}C$. The pressure drops of nano ceramic structure are 8.2, 25.5 and 44.9 mmAq at the face velocity of 2.0, 5.9 and 8.8 cm/s, respectively. Also the water vapor permeability is $3.6g/m^2{\cdot}h{\cdot}mmHg$. In this research, the porous nano ceramic structures are obtained and the possibility for the usage of a material for HEPA type breathing wall can be obtained.

• 에너지공학
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• 제13권4호
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• pp.296-300
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• 2004

본 연구는 지열원 물 대 물(water to water)히트 펌프 시스템의 냉방 및 난방 운전시 성능 특성과 경제성 평가에 관한 것이다. 5개의 보어홀당 지중 100m의 깊이로 밀폐 수직형 지중 열교환기(closed-vertical ground source)가 설치된 냉난방 시스템이 적용된 건축물에 대하여 냉난방 운전성능을 평가하였으며, 연간 소비전력을 측정하여 실제 시스템의 경제성을 분석하였다. 또한, 순환수의 입구온도에 따른 시스템의 운전 성능을 분석한 결과 난방시에는 COP가 3.0에서 4.2로 증가한 반면, 냉방시에는 5.0에서 3.7로 감소하였다. 본 실험을 통해서,대상 건축물에 대한 지열 냉난방 시스템의 수명주기비용은 기존 냉난방 시스템(보일러+에어컨)에 비해서 68%까지 절감되었으며, 시스템의 경제성을 고려해 볼 때 기존 건축물에도 지열원 냉난방 시스템을 적용하는 것이 타당하다.

• 한국전기전자재료학회논문지
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• 제33권4호
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• pp.331-335
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• 2020

In this study, through the accumulated technologies such as real-time monitoring of power consumption using power line communication (PLC) method, power control, and automatic blocking of standby power, to commercialize them, we developed the hardware design, algorithm, protocol and module along with data transmission using PLC. We conducted the study to develop advanced products. We also proposed cloud-based smart outlet products with a novel type of outlet. These products can measure the internal power consumption through the H/W modules and the modules that control the power of household appliances connected to the smart outlets and smart plugs. Subsequently, they transmit the measurements to the energy saving system server via a communication module. This system can control the terminal device connected to the Gateway (G/W) server through a mobile phone. This will allow the customer to check the power consumption of the building at any given time, to turn the terminal on/off, and to maximize the energy efficiency during the construction of new apartments or multi-family housing in an area.

• 한국수소및신에너지학회논문집
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• 제29권6호
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• pp.596-605
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• 2018

Interest in hydrogen, as an energy carrier, has been growing to solve the problems on shortage of fossile fuels and greenhouse gas. According to the standard KGS FU 551 for stationary fuel cell installation, the fuel cell system could be connected up to two common exhausts to one floor. depending on the required power for building or the installation environment in buildings, multiple fuel cell systems could be installed. Afterwards the number of perforations and flues could be decided. Hence, economic efficiency in significantly determined with respect to installation area and the number of fuel cell systems. In addition, the complexity of common vent structure for stationary fuel cell systems could be changed. In this paper, Verification experiments were conducted by connecting the common exhaust system to the fuel cell simulation system and the actual fuel cell system. Humidity and temperature were changed at ON/OFF, but no factors were found to affect performance or system malfunction. Exhaust emissions were also measured to obtain optimized values. We intend to expand the diffusion of stationary fuel cells by verifying safety of common exhaust structure.

• 실천공학교육논문지
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• 제14권2호
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• pp.387-392
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• 2022

세계적인 탄소 중립에 동참하고자, 대한민국 정부에서도 '녹색건축물 조성 지원 법' 시행령을 통해 2030년까지 모든 건축물에 대해 제로에너지 건축물 인증을 진행할 계획에 있다. 이에 따라 국가적으로도 비교적 생활 밀접 접근성이 좋은 태양광 발전과 관련한 여러 사업을 지원하고 있다. 특히 지붕 설치형 태양광 발전 시스템의 경우 환경 파괴 없이 유휴 공간을 활용하여 에너지를 생산한다는 측면에서 주목받고 있지만, 다른 태양광 발전 설비 대비 낮은 발전효율이 단점으로 지적되고 있다. 따라서 본 논문에서는 이러한 부분을 해소하고자, 단축형 태양광 추적을 위한 태양광 패널 구조물에 관한 연구를 통해 효율적인 태양광 패널 각도 가변 시스템을 제안하고 더불어 지붕 설치형 태양광 발전 시스템의 적용 환경을 고려해 태양광 패널의 파손 및 2차 피해 예방을 위한 방안을 제안한다. 더불어 ICT 융합을 통해 태양광 패널을 제어, 사고 예측 안전 시스템 구성을 프로젝트 기반의 교육 프로그램 연계 구성이 가능할 것으로 판단된다.

• KIEAE Journal
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• 제11권4호
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• pp.87-94
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• 2011

This study was suggested to develop sustainable durability design system and proposed the plan to evaluate design conditions that meet the intended service life and $LCCO_{2}$ reduction level of reinforced concrete structure easily from the early design stage. For that the W/B and covering depth of the concrete structure were calculated through calculation of service life based on standard specification expression and the quantitative reduction rate of the vertical member of reinforced concrete structure by the calculated W/B was applied. Life cycle of building classified into construction stage, operation stage, maintenance stage, and demolition/disposal stage and the method of $CO_{2}$ evaluation of each stage was proposed. For construction stage, the major construction materials that take up over 80% $CO_{2}$ emitting during building construction were selected and the $CO_{2}$ evaluation method for 5 standard apartment houses was proposed. Also, for operation stage, $CO_{2}$ emission was calculated through calculation of heating load by energy efficiency rating certification system. For maintenance stage, $CO_{2}$ emission was calculated using concept of re-construction by life and for demolition/disposal stage was calculated with the use of construction standard estimate. As a result of the case study by such evaluation methods, 80 years of service life and 17 specifications of sustainable durability design that meet the 40% intended $LCCO_{2}$ reduction level were deduced. The Maximum $LCCO_{2}$ reduction rate was analyzed by 47.2%.

• KIEAE Journal
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• 제15권6호
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• pp.27-36
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• 2015

Purpose: The definition and factors of passive design being the sustainable method of building plan through the preceding research is deducted and the effect of passive design within the public library by applying the deducted factors in the case of built public libraries and further the realization plan of green library aimed to be reviewed in this research. Method: This study is to induce common elements of architecture plan for public library and passive design, and assess application level of re-classified elements of sustainable public library in order to analyze present condition of passive design applied on facilities of public library. First, related laws and planning standards of public library will be reviewed, then the definition of passive design will be considered using advanced research. Through advanced research related to planing elements and passive design for library induced from various plans for library standards, a common ground of induced passive design element will be transformed into assessment items and practices to be analyzed. Result: Libraries which are and are not preliminarily certified by G-SEED will be compared with each other in order to analyze the effects of passive design on G-SEED. Even though various passive elements such as load reduction of air conditioning and energy efficiency exist, there are no assessment tool within G-SEED. The fact that there are only standards for temporary methods such as utilization of construction material and installation of equipment highlights the challenges in quantitative evaluation.