• Title/Summary/Keyword: Energy Supply Pattern

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Power demand pattern analysis for electric appliances in residential and commercial building (주택 및 사무용 빌딩 내 전기기기의 전력 수요 패턴 분석)

  • Noh, Sung-Jun;Lee, Soon-Jeong;Lee, Sang-Woo;Kim, Kwang-Ho
    • Journal of Industrial Technology
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    • v.30 no.A
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    • pp.9-15
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    • 2010
  • Recently, Smart Grid is a emerging topic in power and communication industry. Smart Grid refers to a evolution of the electricity supply infrastructure that monitors, protects, and intelligently optimize the operation of the interconnected elements including various type of generators, power grid, building/home automation system and end-use consumers. In order to successful implementation of Smart Grid, energy management function will be the key factor that coordinates and optimally controls the various loads according to the operating condition and environments, and the load patterns in residential and commercial building will be required as fundamental element for load management. In this study, we collects many types of energy usage data of electric appliances, analyze their load curves, and make the general load patterns for electrical appliance.

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A Study on the Operating Performance of Solar Assisted Hot Water System for Apartment Houses (공동주택용 태양열원 급탕시스템의 운전성능 연구)

  • 이윤규;황인주
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.15 no.11
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    • pp.928-936
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    • 2003
  • In the present study, feasibility investigation on the solar assisted hot water supply system for apartment houses was carried out by the review of service facility and heat load pattern. Also analysis and experiment of the small sized system model were performed. This hybrid system are consists of solar collector, heat storage tank, controller, and gas boiler using LPG as a secondary heat source. The analytical results showed a good agreement with experimental data. We found that this hybrid system could reduce the energy cost by 30% for hot water compared to typical boiler system in the apartment houses. Also we showed that this model could be used for the energy and economic analysis of the hybrid system.

Finite Element Analysis of an Ultrasonic Tool Horn for Pattern Forming (초음파 패턴성형을 위한 공구혼의 설계 및 유한요소해석)

  • Seo, Young-Soo;Park, Keun
    • Journal of the Korean Society for Precision Engineering
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    • v.28 no.3
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    • pp.363-369
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    • 2011
  • In this study, a direct pattern forming process on a plastic film using ultrasonic vibration energy is investigated. A tool horn containing micro-patterns is attached to an ultrasonic power supply, and is used to press a plastic film with ultrasonic vibration in order to replicate micro-patterns on the surface of the plastic film. To replicate micro-patterns with high accuracy, the tool horn should be designed to allow only the longitudinal vibration, not the transverse vibration. For this purpose, the design of a tool horn is investigated through finite element analysis, from which the resulting natural frequency of the tool horn can be adjusted in the range of the ultrasonic power supply. The analysis result is then reflected on the optimal design and fabrication of the tool horn. The validity of the developed tool horn is discussed through pattern-forming experiments using the ultrasonic vibration of the developed tool horn.

Development of High Efficiency Contactless Power Supply System for Stocker System (Stocker 시스템에 적용한 고효율 비접촉 전원시스템 개발)

  • Hwang, Gye-Ho;Kim, Won-Gon;Yun, Jong-Bo;Moon, In-Ho;Lee, Bong-Seob;Min, Byung-Jae;Kim, Dong-Hee
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.24 no.2
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    • pp.77-85
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    • 2010
  • Recently, As increasing cleanroom size, Stocker system is trending the large size and long distance for LCD material transfer system In order to rise a rate of production, the manufacturer are on the decrease of total tact time with Stocker system And the manufacturer are requested to high speed of next generation Stocker system Also manufacturers for the high oil prices through energy-saving conservation to minimize plant operating costs are required. Therefore, this paper propose optimal design of high efficiency Contactless Power Supply(CPS) system about high speed and energy savings of next generation Stocker system This paper proposes CPS system is applied in the long distance and straight section with Stocker system for energy savings. The test results of input!output characteristic and efficiency of CPS system on operating pattern of Stocker system were analyzed, and proved the applicability on commercial use.

A Study on Types of Groundwater Use and Proposal for Reasonable Use in Korea (우리나라 지하수 이용 형태 고찰과 합리적 활용 방안에 대한 연구)

  • Kim, Hyoung-Soo
    • Journal of Soil and Groundwater Environment
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    • v.22 no.5
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    • pp.112-127
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    • 2017
  • Groundwater accounts for more than 10% of the total water supply in Korea. However, the contribution of groundwater to public water supply systems has been poorly played role throughout the country except for Jeju Island. Compared with the groundwater uses in foreign countries, the pattern of groundwater use in Korea seems to be very deformed and unreasonable. Currently, the development and use of groundwater in Korea are mostly carried out by the individuals, and public sectors such as central and local governments are not actively involved in such activities. Private groundwater use and management will continue to cause groundwater depletion and pollution problems. It is necessary to actively enhance the role of public authorities in groundwater managements by engaging precise hydrogeological surveys and proper economic evaluation in the development and operation of groundwater sources. Also, in order to solve the problems that public water supply systems overly rely on the surface water sources, it is necessary to take policies that require the water supply companies to secure a variety of water sources.

The visualization of pulverized coal injection pattern (산화제 공급 각도 변경에 따른 미분탄 분사 패턴 가시화 연구)

  • Park, Seik;Seo, Haikyung;Lee, Joongwon;Kim, Uisik
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.78.2-78.2
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    • 2011
  • To achieve the required higher efficiency and lower emission performance, Korea's 300 MW IGCC RDD&D (Research Development, Demonstration and Dissemination) project was launched in December 2006 under the leadership of the Korea Electric Power Corporation (KEPCO), with the support of the Korea Ministry of Knowledge Economy. Our research group, KEPCO Research Institute had set-up the a coal gasifier for the pilot test and conducted many experiments for parametric study in this project. Our group focused visualization of pulverized coal injection pattern in the gasifier. Through this study we found that two types of coal burners having different oxygen supply angles can be a source changing gasification condition like temperature.

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Overcoming Electrical Energy Efficiency Gap in Nepal's Residential Sector

  • Thapa, Shahadev;Kim, Yun Seon
    • Asia Pacific Journal of Business Review
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    • v.3 no.1
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    • pp.19-38
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    • 2018
  • The energy intensity of Nepal is economically not worthy, lacks eco-friendly and importantly not sustainable, and almost four times the average global energy intensity. Considerable efforts have been exercised to reduce the energy gap yet, it is still much to achieve. Nation priority on energy sector was envisaged with promulgation of investment friendly rules and law in hydropower and renewable technology even though, could not harness the sufficient energy. In amid of this acute energy crisis, the government launched the Nepal Energy Efficiency Programme (NEEP) with technical assistance from German International Cooperation (GIZ). Energy Efficiency (EE) practice is the most cost-effective method to reduce the supply and demand gap, reduce on greenhouse gases and pollution, and deter on import of petroleum products which finally improves on trade imbalance. This paper had proposed a framework of energy management team to promote energy efficient technologies in residential consumer. The energy management teams study the past records of energy use pattern of consumers and suggest appropriate technology for energy saving options. The paper provides some reviews of energy efficiency initiatives undertaken by the concern regulatory body which highlights the current status. The comprehensive knowledge acquired through exploratory research is implemented in this paper to identify the various barriers that domestic consumer is experiencing towards the active participation in energy efficiency program launched by the Government of Nepal.

Fabrication of Nickel-based Piezoelectric Energy Harvester from Ambient Vibration with Micromachining Technology (마이크로 머시닝 기술을 이용한 니켈기반의 압전 진동형 에너지 하베스터 제작)

  • Cha, Doo-Yeol;Lee, Jai-Hyuk;Chang, Sung-Pil
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.25 no.1
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    • pp.62-67
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    • 2012
  • Owing to the rapid growth of mobile and electronic equipment miniaturization technology, the supply of micro mobile computing machine has been fast raised. Accordingly they have performed many researches on energy harvesting technology to provide promising power supply equipment to substitute existing batteries. In this paper, in order to have low resonance frequency for piezoelectric energy harvester, we have tried to make it larger than before by adopting nickel that has much higher density than silicon. We have applied it for our energy harvesting actuator instead of the existing silicon based actuator. Through such new concept and approach, we have designed energy harvesting device and made it personally by making with micromachining process. The energy harvester structure has a cantilever type and has a dimension of $10{\times}2.5{\times}0.1\;mm^3$ for length, width and thickness respectively. Its electrode type is formed by using Au/Ti of interdigitate d33 mode. The pattern size and gap size is 50 ${\mu}m$. Based on the measurement of the nickel-based piezoelectric energy harvester, it is found to have 778 Hz for a resonant frequency with no proof mass. In that resonance frequency we could get a maximum output power of 76 ${\mu}W$ at 4.8 $M{\Omega}$ being applied with 1 g acceleration.

Wireless Energy Supply for a MAV Propulsion System

  • Shimane, Eri;Komatsu, Shuhei;Komaru, Takashi;Komurasaki, Kimiya;Arakawa, Yoshihiro
    • Proceedings of the Korean Society of Propulsion Engineers Conference
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    • 2008.03a
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    • pp.862-865
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    • 2008
  • Wireless energy supply for an MAV propulsion system using microwave was developed. This system consists of three sub system; the transmitter system, the rectenna system, and the tracking system. In the transmitter system five horn antennas were used as the antenna elements for the phased array system and both the beam divergence and steering angle was about 9deg. Eight rectennas were arrayed in parallel to obtain enough power to drive the electric motor on the MAV(the voltage was 250mV and the current was 6.8mA) in rectenna system. In tracking system two units of antenna system with leaf pattern which received the linearly-polarized wave despite the MAV yaw angle were set in each axis(x, y) for tracking an MAV in a 2-Dimentional space. And three output voltages $V_{com},\;V_1$ and $V_2$ were loaded in the PC to detect if the distance between transmitter and receiver was not constant. Finally when the microwave beam was steered by the phased array system the output voltage from rectenna was measured at 62cm while the MAV circled around above the transmitter system.

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High Cell Density Culture of Anabaena variabilis with Controlled Light Intensity and Nutrient Supply

  • Yoon, Jong-Hyun;Shin, Jong-Hwan;Ahn, Eun-Kyung;Park, Tai-Hyun
    • Journal of Microbiology and Biotechnology
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    • v.18 no.5
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    • pp.918-925
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    • 2008
  • Controlling the light energy and major nutrients is important for high cell density culture of cyanobacterial cells. The growth phase of Anabaena variabilis can be divided into an exponential growth phase and a deceleration phase. In this study, the cell growth in the deceleration phase showed a linear growth pattern. Both the period of the exponential growth phase and the average cell growth rate in the deceleration phase increased by controlling the light intensity. To control the light intensity, the specific irradiation rate was maintained above $10\;{\mu}mol/s/g$ dry cell by increasing the incident light intensity stepwise. The final cell density increased by controlling the nutrient supply. For the control of the nutrient supply, nitrate, phosphate, and sulfate were intermittently added based on the growth yield, along with the combined control of light intensity and nutrient concentration. Under these control conditions, both final cell concentration and cell productivity increased, to 8.2 g/l and 1.9 g/l/day, respectively.