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  • Title/Summary/Keyword: Lighting Energy

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A Study on the Heating and Cooling Energy Load Analysis of the KNU Plant Factory (KNU 식물공장의 냉난방 에너지 부하 해석에 관한 연구)

  • Lee, Chan-Kyu;Kim, Woo-Tae
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.4
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    • pp.1419-1426
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    • 2012
  • The heating and cooling energy load of the KNU plant factory was analyzed using the DesignBuilder. Indoor temperature set-point, LED supplemental lighting schedule, LED heat gain, and type of double skin window were selected as simulation parameters. For the cases without LED supplemental lighting, the proper growth temperature of lettuce 20C was selected as indoor temperature set-point together with 15C and 25C. The annual heating and cooling loads which are required to maintain a constant indoor temperature were calculated for all the given temperatures. The cooling load was highest for 15C and heating load was highest for 25C. For the cases with LED supplemental lighting, the heating load was decreased and the cooling load was 6 times higher than the case without LED. In addition, night time lighting schedule gave better result as compared to day time lighting schedule. To investigate the effect of window type on annual energy load, 5 different double skin window types were selected. As the U-value of double skin window decreases, the heating load decreases and the cooling load increases. To optimize the total energy consumption in the plant factory, it is required to set a proper indoor temperature for the selected plantation crop, to select a suitable window type depending on LED heat gain, and to apply passive and active energy saving technology.

Light Control System For The Saving of Electric Energy (전기에너지 절약을 위한 조명제어시스템)

  • Han, Seung-Ho;Kim, Seong-Cheol;Choi, Kyoung-Sik
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2008.10a
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    • pp.289-292
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    • 2008
  • This paper represents the electric energy saving using light control system. Without Light Control System(LCS), it is very hard to classify the amount of electric energy saving for lighting, since it is determined by the end-user's preference in times. Typical LCS has an fixed algorithm to control each light's intensity by ON/Off Control, Step Control, or Dimming Control. We have studied the electric energy saving effect in a LCS equiped building with natural lighting. The electric power consumption at the peak power consumption time with LCS reduced up to 65% of the non-controled case.

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Mechanism Development and Position Control of Smart Buoy Robot

  • Park, Hwi-Geun;Kim, Hyun-Sik
    • Journal of Ocean Engineering and Technology
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    • v.35 no.4
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    • pp.305-312
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    • 2021
  • There is a gradual increase in the need for energy charging in marine environments because of energy limitations experienced by electric ships and marine robots. Buoys are considered potential energy charging systems, but there are several challenges, which include the need to maintain a fixed position and avoid hazards, dock with ships and robots in order to charge them, be robust to actions by birds, ships, and robots. To solve these problems, this study proposes a smart buoy robot that has multiple thrusters, multiple docking and charging parts, a bird spike, a radar reflector, a light, a camera, and an anchor, and its mechanism is developed. To verify the performance of the smart buoy robot, the position control under disturbance due to wave currents and functional tests such as docking, charging, lighting, and anchoring are performed. Experimental results show that the smart buoy robot can operate under disturbances and is functionally effective. Therefore, the smart buoy robot is suitable as an energy charging system and has potential in realistic applications.

The Study on Lighting Load of Lower-part in Apartment Houses (공동주택 저층부의 조명부하에 관한 연구)

  • Lee, Dong-Wook;Lee, Jun-Gi;Lee, Gab-Taek;Kim, Yong-Tae;Lee, Kyung-Hee
    • Journal of Power System Engineering
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    • v.20 no.1
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    • pp.63-68
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    • 2016
  • The study is arranged in the form of plate-shaped in the Apartment Houses with placed at right angles. After examined the daylight environment and the indoor illumination in this form of Apartment Houses, in order to improve the daylight environment of the lower floors, I examined the daylight environment. In order to match the indoor illumination, as a standard illumination 400lx, I examine the necessary lighting energy based on the direction and time for the different parts in the Apartment Houses, As the first floor, the lowest power requirement appeared to the South(457W), and the most power requirement appeared to the East(843W).

Interior Partitioned Layout and Daylighting Energy Performance in Office Buildings

  • Kim, Gon
    • Architectural research
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    • v.1 no.1
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    • pp.31-40
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    • 1999
  • In this age of "Information", many people consider it a deterrent to information flow to provide a hierarchy with private rooms in a modern office layout. There are others, however, who insist that visual and acoustical privacy are more important than any other design factor in achieving higher productivity. The debate may never end, but the partitioned open plan, which is a new form of the vast open plan, has merits of each concept - open and closed layout. Consequently, office design has dramatically shifted to partitioned open planning, with shorter, temporary walls or partitions, originally intended for increasing privacy and diminishing hierarchy, yet still keeping flexibility in spatial organization. The introduction of low-level partitioned spaces in an office layout, however, produces a complicated lighting design problem. Obviously, accurately predicted daylighting performance data are needed not only for daylighting design but for artificial lighting system design. Scale models of 12 sets of unit partitioned spaces are constructed and extensive scale model measurements of both daylight and reflected sunlight have been performed within an artificial sky simulator. The prototype-building interior is modeled with different partition configurations, each of which is modeled using the different envelope geometry and exterior configurations, and then the variations in interior light levels are estimated. The result indicates that partitioned spaces employed in an open plan of modern offices still offer a large potential for daylighting and energy saving as well. Much of the savings may derive from the cumulative effect of reflected sunlight. Optimal design for building envelope geometry and exterior configuration promises additional savings.

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A Study on Analysis of Space Evaluation Using the Luminance Distribution Images (휘도분포영상을 이용한 공간평가분석에 관한 연구)

  • Han, Sang-Pil;Kim, Jong-Youn;Cho, Nam-Cheol;Yi, Yong-Kyu;Kim, Nam-Jin
    • Journal of the Korean Solar Energy Society
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    • v.33 no.5
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    • pp.76-81
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    • 2013
  • In our former study, we proposed that the AC-Model might be applied to various conditions. And we also introduced the method for daylighting that it was possible to reduce discomfort glare and to improve visual impressions as the supplementary type and blind-control type on the compound lighting. The purpose of this study was to examine the relationship between physical elements and psychological evaluation of lighting space. The study was made using an full-size space, which were equipped with various luminaries. We investigated the relationship between subjective evaluation and characteristics of light distribution and showed the high correlation between the evaluation rating and luminance distribution over whole room.

Utilization Efficiencies of Electric Energy and Photosynthetically Active Radiation of Lettuce Grown under Red LED, Blue LED and Fluorescent Lamps with Different Photoperiods

  • Lee, Hye In;Kim, Yong Hyeon
    • Journal of Biosystems Engineering
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    • v.38 no.4
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    • pp.279-286
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    • 2013
  • Purpose: This study was conducted to analyze the utilization efficiencies of electric energy and photosynthetically active radiation of lettuce grown under red LED, blue LED and fluorescent lamps with different photoperiods. Methods: Red LED with peak wavelength of 660 nm and blue LED with peak wavelength of 450 nm were used to analyze the effect of three levels of photoperiod (12/12 h, 16/8 h, 20/4 h) of LED illumination on light utilization efficiency of lettuce grown hydroponically in a closed plant production system (CPPS). Cool-white fluorescent lamps (FL) were used as the control. Photosynthetic photon flux, air temperature and relative humidity in CPPS were maintained at 230 μmolm2s1, 22/18C (light/darkness), and 70%, respectively. Electric conductivity and pH were controlled at 1.5-1.8 dSm1 and 5.5-6.0, respectively. The light utilization efficiency based on the chemical energy converted by photosynthesis, the accumulated electric energy consumed by artificial lighting sources, and the accumulated photosynthetically active radiation illuminated from artificial lighting sources were calculated. Results: As compared to the control, we found that the accumulated electric energy consumption decreased by 75.6% for red LED and by 70.7% for blue LED. The accumulated photosynthetically active radiation illuminated from red LED and blue LED decreased by 43.8% and 33.5%, respectively, compared with the control. The electric energy utilization efficiency (EEUE) of lettuce at growth stage 2 was 1.29-2.06% for red LED, 0.76-1.53% for blue LED, and 0.25-0.41% for FL. The photosynthetically active radiation utilization efficiency (PARUE) of lettuce was 6.25-9.95% for red LED, 3.75-7.49% for blue LED, and 2.77-4.62% for FL. EEUE and PARUE significantly increased with the increasing light period. Conclusions: From these results, illumination time of 16-20 h in a day was proposed to improve the light utilization efficiency of lettuce grown in a plant factory.

A Trend of the National and International Standards for Fluorescent Induction Lamps (무전극 형광램프 국내외 표준화 동향)

  • Cho, M.R.;Shin, S.W.;Lee, S.H.;Hwang, M.K.;Lee, D.Y.;Yang, S.Y.;Ham, J.K.
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2007.05a
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    • pp.145-147
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    • 2007
  • Fluorescent induction lamps are assembly of a Low Pressure Mercury discharge vessel and an inductive power coupler. A vessel containing at least a Low Pressure Mercury vapor, which will be energized by means of the Inductive Coupler. The Ultra Violet radiation from the resulting discharge is converted by a layer of fluorescent material into visible light. The discharge vessel may have means of mechanical fixation to position it to the Inductive power coupler. The component to transform High Frequency electrical energy, by means of induction, in order to energize the Low Pressure Mercury in the discharge vessel. The component includes electrical connection. Fluorescent induction lamps don't have international standards yet. So we try to correspond Korea standards to international standards.

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An Efficient Hybrid Lighting Management System Implementation on Multi Protocol (다중 프로토콜 기반의 효율적인 하이브리드 조명관리 시스템 구현)

  • Hong, Sung-Il;Lin, Chi-Ho
    • Journal of IKEEE
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    • v.17 no.4
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    • pp.550-558
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    • 2013
  • In this paper, we propose an efficient hybrid lighting management system implementation on multiple protocol. The proposed hybrid lighting management system was implemented by configured as the data display part for management and control of lighting device and the data conversion-processing part the communication part of gateway. The data were designed the DB to enable to storage in real-time, and implemented able to manage by real time wireless remote control and schedule setting. The proposed an efficient hybrid lighting management system, it was possible the real-time monitoring and remote lighting control by peristalsis with smart devices and portable PC etc., and it could be obtained reduction effect of energy and electricity, communication cost.

Economic Feasibility Analysis on the Benefit of Daylighting Incorporation Devices under Clear Skies (주광연동 제어설비를 이용한 청공광의 경제성 평가)

  • Kim, Gon;Kim, Jeong-Tai
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.19 no.7
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    • pp.491-499
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    • 2007
  • An architectural means of optimal daylight distribution is by using so-called light shelf systems, horizontal shading and redirecting devices. The overall performance of the daylighting system can be improved by the incorporation with electric lighting control devices. This paper aims to exemplify the benefit of daylighting in term of economic consideration. In such a case a reasonable technique to compare system costs is by life-cycle costing. Stated simply, a life-cycle cost represents the total cost of a system over its entire life cycle, that is, the sum of first cost and all future costs. Four different electric lighting system designs are proposed and a lighting control system that is continuously operating according to the level of daylight in the space has been adapted. The result shows clearly that although denser layout of lighting fixtures might be more effective to interface to the level of daylight ceaselessly changeable, its economic benefit may not meet the expected criterion the reason of increased initial investment and maintenance cost for the fixtures and control devices.