• The Magazine for Energy Service Companies
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• s.58
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• pp.34-37
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• 2009

'안전시공, 완벽시공, 고객만족'의 슬로건으로 ESCO를 말하는 기업이 있다. 대구에 위치한 (주)동서 기연은 소형열병합발전시스템, 바이오매스(우드칩, 바이오탄)보일러, 열회수환기장치, 태양열, 지열, 시스템냉난방기, 통합자동제어시스템, 진공청소시스템 등 기술력을 보유하고 전문 시공 업체로 전문성을 인정받았다. '더 싼 가격으로 더 큰 효율'을 위한 에너지 신기술로 에너지 분야에서 지속적으로 성정하고 있는 동서기연을 소개한다.

• 한국신재생에너지학회:학술대회논문집
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• 2007.06a
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• pp.688-692
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• 2007

Solar thermal power generation allows additional benefits of cheap thermal storage and easy hybridization with other fossil fuel-driven power generation. KIER has been performing the project for solar thermal chemical reaction hybrid power generation. The project is to build and operate the first solar thermal chemical reaction hybrid power generation system in Korea. For concentrating solar thermal energy $m^2$ dish type concentrator was adapted and a heliostat is installed for reflecting horizontal insolation to the dish concentrator. At the moment building the dish concentrator including mirror and heliostat with sun tracking system was completed and it's performance are being closely evaluated. This paper will introduce some detailed designs and construction procedures which we have experienced so far.

• 한국신재생에너지학회:학술대회논문집
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• 2006.06a
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• pp.580-583
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• 2006

A small-scale solar concentrating system was developed and demonstrated for supplying process heat required in solar thermo chemical reaction. The concentration system consists of a heliostat equipped with a solar tracking device and a dish concentrator. From the initial thermal test of the concentrating system it was found that the system works very well with around 500-600 concentration ratio capable of supplying about 3kW therml energy to the reactor. Once the concentration system was turned on, the reactor temperature rapidly increased over $1,000^{\circ}C$ and could be maintained high enough for solar chemical reaction.

• Proceedings of the KIPE Conference
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• 2011.11a
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• pp.161-162
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• 2011

신재생에너지는 자연계에 존재하는 에너지원으로 이용하는 이상의 속도로 재생되는 에너지원이다. 그 에너지원은 태양, 풍력, 조력 등으로 사실상 고갈되지 않는 에너지원이며 또한 수력, 태양광, 태양열, 조력, 풍력, 지열, 바이오매스 등의 형태로 이용된다. 이들 에너지원은 직접, 또는 간접적으로 이용하는 경우가 있다.

• 한국신재생에너지학회:학술대회논문집
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• 2005.11a
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• pp.492-504
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• 2005

본 신 재생에너지설비 시공 및 설치확인 기준 연구는 신재생에너지 시스템의 효율적인 보급과 사후관리 비용 절감 및 성능향상으로 인한 에너지 생산을 효과적으로 할 수 있게 될 뿐 만 아니라 보급확대를 위해서는 필수적으로 있어야 할 기준이다. 현재 보급사업으로 추진되고 있는 5개 에너지원에 대한 설비 시공 및 설치확인 기준을 작성하여 보급사업의 지침서 역할을 하도록 하였다. - 태양열 시스템 시공 및 설치확인 기준 개발 - 지열이용 시스템 시공 및 설치확인 기준 개발 - 태양광발전 시스템 시공 및 설치확인 기준 개발 - 풍력발전 시스템 시공 및 설치확인 기준 개발 - 소수력발전 시스템 시공 및 설치확인 기준 개발

• Solar Energy
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• v.18 no.2
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• pp.19-29
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• 1998

Solar energy is a quantitatively unlimited, clean and non-pollutant source. It has a great potential for industrial commercial usages. For example, solar hot water system for domestic usage has been very popular in many counties. In Korea, the industries consume 47.7% of the total national energy, and the manufacturing sector uses 91.5% out of it. The main energy resoures available in Korea are oils, coals, and gases. There have been continuous efforts among the industries to reduce such energy consumptions by using alternative energy resources, such as solar energy, yet the technology has limited its proper applications to a level of satisfaction. In some advanced countries, research and development programs in solar energy applicable to the industrial usages are very active, and some systems are in the commercial market. Therefore, this paper describes the status and the feasibility for high-efficiency evacuated solar collector which was anticipated to applied for industrial process heat as an alternative of fossil energy.

• Journal of Advanced Marine Engineering and Technology
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• v.34 no.5
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• pp.625-631
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• 2010

Recently, the fossil energy and its related environmental problems (increase in PPM of $CO_2$) have been increased. Therefore, the interests on new and renewable energy have been increased as the one of the future industrial leading items. Among the renewable energy, the PV (Photo-Volatic) systems has particular merit at the electricity can be directly acquired from the sun. Usually in PV systems, the ambient temperature and air velocity have strongly related on the effect of power generation of PV panel. So the purpose of this study is to clarify relationships between power generation of PV panel and outer environmental factors like temperature and air velocity. And these types of applications using natural energy are strongly affected by the climate conditions. Therefore the data of this study were re-arranged in terms of non-dimensional correlations.

• Journal of the Korean Solar Energy Society
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• v.34 no.5
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• pp.33-41
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• 2014

Heliostat field in a tower type solar thermal power plant is the sun tracking mirror system which affects the overall efficiency of solar thermal power plant most significantly while consumes a large amount of energy to operate it. Thus optimal operation of it is very crucial for maximizing the energy collection and, at the same time, for minimizing the operating cost. Heliostat field operational algorithm is the logics to control the heliostat field efficiently so as to optimize the heliostat field optical efficiency and to protect the system from damage as well as to reduce the energy consumption required to operate the field. This work presents the heliostat field operational algorithm developed for the heliostat field of 200kW solar thermal power plant built in Daegu, Korea. We first review the structure of heliostat field control system proposed in the previous work to provide the conceptual framework of how the algorithm developed in this work could be implemented. Then the methodologies to operate the heliostat field properly and efficiently, by defining and explaining the various operation modes, are discussed. A simulation, showing the heat flux distribution collected by the heliostat field at the receiver, is used to show the usefulness of proposed heliostat field operational algorithm.

• Journal of the Korean Solar Energy Society
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• v.27 no.1
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• pp.91-98
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• 2007

Perimeter zone is one of the weakest area in buildings and it makes an increase of heating and cooling loads, in addition to condensation or discomfort with cold-draft to residents in winter. Because of this, it needs to be reinforced by active systems. However, they use fossil fuel, and ultimately greenhouse effect is urged. Thus, we proposed BIPV system functioned as solar collector which can substitute active system. As an fundamental stage, heat balance equation in steady-state by Fortran was used not only, in winter for pre-heating effect and electric power capacity during the day, but also in summer, for the latter during the day and sky radiation effect during the night. Especially, we should have considered shading on PV by IES Suncast, since even a little bit of it makes the efficiency too low for the PV modules to work. As a result, in summer day, the PV panel should be tiled in 70 degrees to gain the most electric power. Moreover, we could verify that this model makes higher temperature and heat flux under 0.02 m/s. On the other hand, the PV had the high efficiency with high velocity because of cooling effect behind the PV. Therefore, we should regard the air current distribution later on.

• NEWSLETTER 전기공업
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• no.91-15 s.28
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• pp.1-17
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• 1991