• Title/Summary/Keyword: Installed performance

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A study on the design and performance of a stand-alone photovoltaic lighting system (독립형 태양광 조명 시스템의 설계 및 성능 평가 연구)

  • Kwon, Oh-Sang;Seo, Yu-Jin;Huh, Chang-Su
    • Journal of the Korean Solar Energy Society
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    • v.24 no.4
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    • pp.1-10
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    • 2004
  • In view of global environmental problems and resource exhaustion, we must develop new energy resources that are abundant and provide substitutes for fossil fuels. Renewable energies, such as solar, are ideal because they are clean, inexhaustible, and available everywhere in the world. Photovoltaic(PV) system, in general, are operated as a stand-alone, grid-tied, or hybrid system. Many of the stand-alone PV systems are installed. Although the pre-installation cost of PV system is high, it poorly has been operated due to the absence of optimal management standards. Therefore a study on the performance of PV system is important for the system design and maintenance. In this paper a photovoltaic lighting system was resigned according to load consumption. Then a PV lighting system which used electrodeless lamp as a load was installed. In order to investigate the system operating characteristics we've added a monitoring system to the PV lighting system. The monitoring system using the LabVIEW program regularly checks the operation of the PV lighting system and records the system data. According to the system data, the stability and availability of the PV lighting system were evaluated.

Movable BIPV Shading Device Design for Apartment Building Balcony (발코니 설치식 가동형 차양겸용 BIPV 디자인과 성능연구)

  • Chin, Kyung-Il;Yoon, Jong-Ho
    • Journal of the Korean Solar Energy Society
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    • v.30 no.5
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    • pp.85-92
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    • 2010
  • At the beginning the 21st century, we are interested in renewable energy especially photovoltaic. So, we have been installed PV at the building roofs so that we call it building integrated photovoltaic. But strictly speaking, installing the PV on the roof is not building integrated. There are few BIPV designs especially for balcony. In the apartment building, roof is good installing place for PV, but its area was limited. Now a day, built apartment building's heights are more and more increased so that the performance of installed PV on the roof cannot be enough to use even the public use. Thereby, we need the new space in the building to install the PV except the building roof. This study suggests the building facade balcony as a new space to install the PV with building integrated PV design. Hence, in this study, we are designed the movable BIPV shading device for apartment building balcony, and verified its performance with computer simulation. Developed device in this study can works as an electronic generation device and an overhang on the side balcony. As a result, the electronic generation performance of device contributes 15~30% to each apartment unit. The more unit width increase, the better contributed device generates.

The CFD Analysis Comparison of Several Snubbers with different Buffer Width (버퍼의 넓이가 다른 스너버의 수치해석 비교)

  • Lee, G.H.;Shim, K.J.;Lee, Y.H.;Chung, H.S.;Jeong, H.M.
    • Journal of Power System Engineering
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    • v.11 no.4
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    • pp.38-43
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    • 2007
  • Pulsation is an inherent phenomenon in reciprocating compressors. It interacts with piping to cause vibrations and performance problems. Indiscriminately connecting to a compressor can be dangerous and cost money in the form of broken equipment and piping, poor performance, inaccurate metering, unwanted vibration, and sometimes noise. Piping connected to a compressor can materially affect the performance and response. To minimize these detrimental effects, reciprocating compressor system should be equipped by pulsation suppression system. The system usually comprises bottle volume, called snubber. Snubber is one of the most important parts in hydrogen compressing system. It has installed reciprocating hydrogen compressor. One of these components is snubber which has function to reduce pulsation waveform and to remove the impurities in the hydrogen gas. A snubber has an inclined plate as a buffer, which is installed inside snubber. When the pressure loss and the pulsation of pressure within a snubber is minimized, the snubber could get more applicability. Therefore, a study to find an optimum geometric size on a several snubbers which have different buffer width, has been conducted using a numerical analysis.

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Real time Omni-directional Object Detection Using Background Subtraction of Fisheye Image (어안 이미지의 배경 제거 기법을 이용한 실시간 전방향 장애물 감지)

  • Choi, Yun-Won;Kwon, Kee-Koo;Kim, Jong-Hyo;Na, Kyung-Jin;Lee, Suk-Gyu
    • Journal of Institute of Control, Robotics and Systems
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    • v.21 no.8
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    • pp.766-772
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    • 2015
  • This paper proposes an object detection method based on motion estimation using background subtraction in the fisheye images obtained through omni-directional camera mounted on the vehicle. Recently, most of the vehicles installed with rear camera as a standard option, as well as various camera systems for safety. However, differently from the conventional object detection using the image obtained from the camera, the embedded system installed in the vehicle is difficult to apply a complicated algorithm because of its inherent low processing performance. In general, the embedded system needs system-dependent algorithm because it has lower processing performance than the computer. In this paper, the location of object is estimated from the information of object's motion obtained by applying a background subtraction method which compares the previous frames with the current ones. The real-time detection performance of the proposed method for object detection is verified experimentally on embedded board by comparing the proposed algorithm with the object detection based on LKOF (Lucas-Kanade optical flow).

Implementation of a High Performance Notch Filter Algorithm for Power Line Communication System (전력선 통신 시스템을 위한 고성능 Notch Filter 알고리즘 구현)

  • Nam, Yun-Ho;Jang, Dong-Won;Kim, Kyung-Seok
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.10 no.3
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    • pp.159-166
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    • 2010
  • As Power Line has been already installed over 60% of a residential area all over the world, Broadband Service has been possible using high-speed PLC(Power Line Communication) without new access line installed for Internet access. Because of such reason, PLC is researched as the most suitable service for Last Mile Solution. But, Power Line is designed for transmitting electric power, so peripheral Wireless Communication System is affected by a leak of electric wave. In this paper, we propose a High Performance Notch Filter algorithm in comparison with a existing notch filter for reduction of interference between existing Wireless Communication Service and Power Line Service. In addition, we implement the Notch Filter emulator appling a High Performance Notch Filter and using a embedded board.

Improvement of the Performance Based Seismic Design Method of Cable Supported Bridges with Resilient-Friction Base Isolation Systems (II-Proposal for the Seismic Design Procedure) (마찰복원형 지진격리장치가 설치된 케이블교량의 성능 기반 내진설계법 개선(II-내진설계 절차 제안))

  • Gil, Heungbae;Park, Sun Kyu;Han, Kyoung Bong;Yoon, Wan Seok
    • Journal of the Earthquake Engineering Society of Korea
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    • v.24 no.4
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    • pp.169-178
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    • 2020
  • In a previous paper, ambient vibration tests were conducted on a cable stayed bridge with resilient-friction base isolation systems (R-FBI) to extract the dynamic characteristics of the bridge and compare the results with a seismic analysis model. In this paper, a nonlinear seismic analysis model was established for analysis of the bridge to compare the difference in seismic responses between nonlinear time history analysis and multi-mode spectral analysis methods in the seismic design phase of cable supported bridges. Through these studies, it was confirmed that the seismic design procedures of the "Korean Highway Bridge Design Code (Limit State Design) for Cable Supported Bridges" is not suitable for cable supported bridges installed with R-FBI. Therefore, to reflect the actual dynamic characteristics of the R-FBI installed on cable-supported bridges, an improved seismic design procedure is proposed that applies the seismic analysis method differently depending on the seismic isolation effect of the R-FBI for each seismic performance level.

Numerical Analysis for Characteristic of Flow and Disinfection Performance with Variation of Guide Wall in Clearwell (도류벽 형태에 따른 정수지 내 유동 특성과 소독능 변화에 대한 수치 해석적 연구)

  • Lee, Suk-Won;Park, Jun-Jung;Rhee, Gwang-Hoon
    • Proceedings of the SAREK Conference
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    • 2006.06a
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    • pp.767-772
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    • 2006
  • The SWTR(Surface Water Treatment Rule) requires achieving removal 99.9% Giardia and 99.99% Virus. To remove Giardia and Virus, disinfection process is essential process. CT is important index for Disinfection performance. CT value is expressed by CXT. C is represented by disinfection concentration and T is represented by $T_{10}$ which means 90% contact time in clearwell. To improve Disinfection performance, it is desirable to increase $T_{10}$. Primary factor affected $T_{10}$ is flow Pattern. Because guide wall change that flow pattern is uniform, we have installed guide wall to increase $T_{10}$. In this paper, we have performed numerical analysis for clearwell installed symmetric guide wall and center divided guide wall using CFD. We have analyzed flow pattern and $T_{10}$ in each clearwell. And. we compare symmetric guide wall with center divided guide wall in flow pattern and $T_{10}$.

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Parametric analyses for the design of a closed-loop passive containment cooling system

  • Bang, Jungjin;Hwang, Ji-Hwan;Kim, Han Gon;Jerng, Dong-Wook
    • Nuclear Engineering and Technology
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    • v.53 no.4
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    • pp.1134-1145
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    • 2021
  • A design parameter study is presented for the closed-loop type passive containment cooling system (PCCS) which is equipped with two heat exchangers: one installed at the inside of the containment and the other submerged in the water pool at the outside of the containment. A GOTHIC code model for PCCS performance analyses was set up and the design parameters such as the heat exchanger sizes, locations, and water pool tank volumes were analyzed to investigate the feasibility of installing this type of PCCS in PWRs like OPR-1000 being operated in Korea. We identified the size of the circulation loop and heat exchangers as major design parameters affecting the performance of PCCS. The analyses showed that the heat exchangers in the inside of the containment would be more influential on the heat removal capability of PCCS than that installed in the water pool at the outside of the containment. Hence, it was recommended to down-size the heat exchangers in the water pool to optimize PCCS without compromising its performance. Based on the parametric study, it was demonstrated that a closed-loop type PCCS could be designed sufficiently compact for installation in the available space within the containment of PWRs like OPR-1000.

An Experimental Study on Improvement of Fire Extinguishing Performance of Basic Sprinkler System (간이스프링클러 설비의 소화성능 향상에 관한 실험적 연구)

  • Hur, Min Noung;Shin, Changsub
    • Journal of the Korean Society of Safety
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    • v.33 no.3
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    • pp.46-51
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    • 2018
  • A basic sprinkler system is a fire extinguishing system that can be easily installed in a fire-vulnerable place such as a publicly used establishments. However, the publicly used establishments are not only complicated in structure, but also have a large amount of flammable interior materials, and the users are not normally in a normal state, which is a very dangerous fire-fighting object. Therefore, due to the low fire extinguishing performance of the basic sprinkler system installed in the publicly used establishments, the fire suppression control can not be performed quickly in case of fire, which may increase the life and property damage. In this study, the cases of quantitative changes of extinguishing water used in basic sprinkler system and the cases of addition of additives such as wetting agents, reinforced agents to improve extinguishing performance were compared. Experimental results showed that the extinguishing performance was improved as the quantity of extinguishing water increase and the reinforced agents showed similar performance to that of 60% increase in the amount of extinguishing water. The cooling time to $200^{\circ}C$ and oxygen concentration were improved up to 14.3% and 34.5%, respectively. In the case of using the wetting agent, the cooling time to $200^{\circ}C$ and oxygen concentration did not show any significant improvement, but showed the effect of preventing deep seated fire. In order to prevent loss of life and property, it is necessary to improve the performance of the basic sprinkler system by increasing amount of extinguishing water or using additives like reinforced agents.

Evaluation of Sanitation Management Performance within School Foodservice Facilities and Utilities in Gyeongbuk Province (일부 경북지역 학교 급식시설.설비 위생관리 수행도 평가)

  • Jeon, Eun-Kyung;Bae, Hyun-Joo
    • Korean journal of food and cookery science
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    • v.25 no.1
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    • pp.62-73
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    • 2009
  • This study was conducted to evaluate the performance of sanitation management within school foodservice facilities and utilities in Gyeongbuk province. Data collection was carried out through surveys given to 200 school dietitians from the province. A total of 108 were usable, resulting in a 54.0% response rate. Statistical analyses were done using the SAS package program (version 8.2 for Windows). Of the study population, 58.3% had more than 10 years of work experience, and 64.8% worked in elementary schools. With regard to the style of foodservice system, 47.2% were urban and 46.3% were rural. Also, 89.8% of the school foodservices provided meals once a day. The performance of the sanitation management items of the facilities and utilities used to provide school foodservice was evaluated using a 5-point Likert scale. The average score for the 25 items was 3.35 points. 'HVAC system installed in foodservice establishment' had the lowest average score at 2.20 points. Whereas 'provide adequate storage capacity to allow refrigerating and freezing and an adequate thermometer is installed and temperatures monitored' had the highest average score at 4.19 points. Nine out of the 25 items were lower than the average score. The performance scores of high schools were significantly higher than those of elementary schools or middle schools for 'window materials are provided that are not liable to break' (p<0.001). The performance scores for urban style foodservices were significantly lower than for rural foodservices for 'floor of kitchen is constructed to maintain a dry system' (p<0.05). In response to questions on kitchen utensils and equipment, significant differences were shown according to the number of meals served per day in 21 out of 56 items, and the style of foodservice system showed significant differences in 14 of the 56 items. Foremost, to make better use of the foodservice facilities and utilities in Gyeongbuk province, immediate improvements should be made for management items in which the degree of performance was below the average score.