• Title, Summary, Keyword: Energy-saving

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A Development of Simulator to Assessment for Loss Saving of Harmonic Electric Power Energy (고조파 전력에너지의 손실절감량 산정 시뮬레이터 개발)

  • Kim, Yong-Ha;Jo, Hyun-Mi;Heo, Dong-Ryeol;Park, Jong-Min;Park, Hwa-Yong;Yoo, Jeong-Hui
    • Proceedings of the KIEE Conference
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    • pp.1272-1273
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    • 2011
  • A study on demonstration to development of simulator to assessment for loss saving of harmonic electric power energy. harmonic occurs to electric equipment like increase of terminal voltage, resonance phenomena occurrence and noise. To circulate of loss saving of harmonic electric power energy, we assessment electric power loss saving by harmonic and estimate loss saving of far-infrared radiation panel heating system.

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NON CONVENTIONAL METHOD FOR SOFT STARTING OF THREE PHASE INDUCTION MOTORS

  • Ahmed Nabil A.;Kim Sung-Jun;Suh Ki-Young;Kown Soon-Kurl;Lee Hyun-Woo
    • Proceedings of the KIPE Conference
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    • pp.27-31
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    • 2004
  • This paper presents a nonconventional method for oft starting of three-phase induction motors, which achieved by flux weakening technique. flux weakening is not done by reducing the applied voltage as in the conventional methods, Flus weakening is achieved y increasing the supply frequency over the rated value while the voltage amplitude is kept constant. This method has advantage of reducing the stress on the electrical and mechanical systems. The feasibility of this basic idea has been confirmed through investigating the starting transient corresponding to this mode of operation. For this purpose, a rigorous state space mathematical model has been developed and simulated. The validity of the proposed method through the results from the mathematical model have been confirmed experimentally.

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Pump와 Blower의 가변속 운전에 의한 Energy Saving

  • 황용하
    • 전기의세계
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    • v.33 no.7
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    • pp.400-405
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    • 1984
  • 최근 원유가의 상승과 자원 고갈에 따라 Energy 절약 방안이 종래에는 생각하지도 않았던, 기계적인 제어에 의해 사용하던 기기에도 관심을 갖게되었다. 최근 전력전자 기술의 진보로 가변속 제어 Inverter로 교류 전동기의 가변속 운전은 신설 설비는 물론 기 설치된 설비에도 적용이 용이하여 Pump나 Blower등 2승저감 Torque특성을 갖는 부하의 Power Saving을 목적으로 적용을 시도하고 있으나 이에 따른 Engineering 자료 불충분에 따라 실제 적용하고자 하는 자신감 부족으로 적용을 망설이는 예가 흔히 있어 Energy Saving에 대한 기본적인 방향을 제시하고자 한다.

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Evaluation of Energy Saving with Vector Control Inverter Driving Centrifugal Pump System (벡터 제어 인버터 구동 원심펌프시스템의 에너지 절감 평가)

  • Suh, Sang-Ho;Kim, Kyungwuk;Kim, Hyoung-Ho;Yoon, In Sik;Cho, Min-Tae
    • The KSFM Journal of Fluid Machinery
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    • v.18 no.2
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    • pp.67-72
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    • 2015
  • The purpose of this study is to achieve energy saving effect of inverter driving multistage centrifugal pump. For determining the operation points in the pump system, the system curves should be obtained experimentally. To get the system curves, three pumps combined in parallel and one pump operated with different rotational speeds. But for variable speed pump system, energy saving rates can not be evaluated from operation efficiencies. That is why operation efficiencies, system curves, duty cycles, and input powers of the pump system were measured by the constructed experimental apparatus. The duty cycle segmented into different flow rates and weighting the average value for each segment by the interval time. The system was operated with two different periods. The mean duty cycles were collected from apartment and found that the system operated at 40% and at 50% or below capacity. Measured energy saving rate was 58.16%. Estimating method of energy saving rate could be more effective operation index than that of operation efficiency.

Analysis of Energy Saving Rate of Office Buildings According to the Items of an EPI Machine Part (에너지 성능지표 기계부문 항목에 따른 업무용 건물의 에너지 절감율 분석)

  • Lee, Ho Jin;Kim, Seo Hoon;Jung, Jae Uk;Jang, Cheol Yong;Song, Kyoo Dong
    • KIEAE Journal
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    • v.13 no.4
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    • pp.49-54
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    • 2013
  • released by IEA, 2010, indicated that Korea's GDP, of 8 countries surveyed-Korea, Frans, Germany, Italy, Japan, the UK, the USA, and Australia-was the lowest, but the electric consumption per head was third, following America and Australia. Thus, our government has been striving to reduce energy usage and especially to lessen the energy used in buildings, proposing a variety of road maps such as 'building energy efficiency rating' and 'energy saving design standards of buildings'. Accordingly, this study investigated the effect of the items of machine part among EPI items on the energy saving rate. I measured energy usage by ECO2 program, for simulation program, that is used for the building energy efficiency rating. Result showed that items concerning control of pumps and fans had much more saving rate than the ones concerning efficiency of heater and cooler that had bigger scores assigned among EPI items. Result showed that items concerning control of pumps and fans had much more saving rate than the ones concerning efficiency of heater and cooler that had bigger scores assigned among EPI items. Therefore, I think that grades assigned to items in energy performance index need to be corrected.

An Analysis of Heating and Cooling Loads by Insulated Shades and Control Method in an Energy Saving Apartment (에너지절약형 주택에서의 단열차양 적용과 제어방법에 따른 냉난방부하 분석)

  • Park, Sun-Hyo;Kwon, Kyung-Woo;Sohn, Jang-Yeul
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.22 no.6
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    • pp.392-397
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    • 2010
  • Energy loss from windows accounts for large scores of heating and cooling loads also in energy saving apartments that is reduced over 30% of total energy consumption. Movable reflective insulations, insulation shutters, blinds, insulated shades are used to reduce energy loads from windows. In this study, energy saving performance of insulated shades was simulated by control methods. According to installation of insulated shades, heating loads were decreased about 10.5~11.3%, and cooling loads are decreased about 29.1~38.3% on an energy saving apartment. The heating peak load was reduced about 9.5% by insulated shades and the cooling peak load was reduced about 25.7~31.5%. In the case of insulated shades with automatic control system, simple time schedule control system would be more efficient than outdoor detection control system that should use several sensors.

A Study on the Perfomance Analysis of Low Energy Cooling Systems in Office building (사무소건물의 에너지절약형 냉방시스템 성능분석에 관한 연구)

  • Park, Chang-Bong;Rhee, Eon-Gu
    • Journal of the Korean Solar Energy Society
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    • v.30 no.6
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    • pp.89-94
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    • 2010
  • A large portion of the energy cost of a building is cooling and heating to maintain a comfortable indoor environment. Air conditioning is now one of the important parts in the building design, as increase in energy consumption and pollutant emission in energy conversion process. In this study, elements that affects the energy consumption of model building are identified and the perfomance analysis of the alternative a Low Energy Cooling Systems considering characteristics of model building and energy saving performance is analyzed. In this study, elements that affect the energy consumption of office building are identified and energy saving performance of the alternative air conditioning system is analyzed. As a result, applied to earn and suggest basic data for energy saving measures. In this study, EnergyPlus simulation program was used to evaluate the energy load when alternative Low Energy Cooling Systems are applied to the model building. The reliability of simulation program is verified by comparing actual energy load from operation data of building management office and predicted energy load using simulation program. For Low Energy Cooling System application which considers the purpose and characteristics of the building, reasonable and energy-saving air conditioning method obtained by analyzing energy consumption elements for each expected air conditioning methods is used to deduct result of this study.

Design and Implementation of Optimal Control Algorithms for Building Energy Management (빌딩 에너지 관리 최적화 알고리즘 설계 및 구현)

  • Jin Jung-Hwa;Chung Sun-Tae
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.16 no.10
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    • pp.969-976
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    • 2004
  • Building energy saving is one of the most important issues in these days. Energy saving control strategies should be developed properly to achieve the saving. One of such area we could apply is the HVAC (Heating, Ventilation and Air-Conditioning) system. Through the optimal control algorithm for building energy management system (EMS), you can not only save the cost of building energy, but also protect HVAC system components against the unexpected condition. In order to verify the effectiveness of building energy saving, field test was accomplished for several months at 'A' building. And to get the measured data, remote control was used. If the remote control is used in BAS (Building Automation System), control and monitoring can be done for all of the building systems, such as HVAC, power, lighting, security and fire-alarm etc. anywhere any time. Using the remote control, Control and monitoring is possible for the testing system without going there. As the results of field test, we could reduce $5{\sim}10\%$ of the building energy cost.

Development of Hybrid Excavator for Regeneration of Boom Potential Energy (작업장치 위치에너지 회생을 위한 하이브리드 굴삭기 시스템 개발)

  • Yoon, J.I.;Ahn, K.K.;Truong, D.Q.;Kang, J.M.;Kim, J.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.6 no.4
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    • pp.1-8
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    • 2009
  • Nowadays with the high fuel prices, the demands for energy saving and green emission of construction machinery have highly been increased without sacrifice of working performance, safety and reliability. The aim of this paper is to propose a new energy saving hybrid excavator system using an electro-hydraulic actuator driven by an electric motor/generator for the regeneration of potential energy. A 5 ton class excavator is analyzed, developed with the boom for the evaluation of the designed system. The hardware implementation is also presented in this paper. A control strategy for the hybrid excavator is proposed to operate the machine with a highest efficiency. The energy saving ability of the proposed excavator is clearly verified through simulation and experimental results in comparison with a conventional hydraulic excavator.

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A Study on analyze of energy saving rate by retrofitting multi air-conditioner from conventional type to high efficient type using Energyplus (Energyplus를 이용한 고효율 멀티에어컨디셔너의 에너지절감 효과 분석)

  • Seo, Jeongsik;Kim, Ook Joong;Woo, Juntae;Choi, Younsung;Jeon, Jongog
    • 한국신재생에너지학회:학술대회논문집
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    • pp.165.2-165.2
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    • 2010
  • The objective of this study is to analyze the energy saving rate by retrofitting multi air conditioner from conventional type to high efficient type using Energyplus 4.0 which was developed for simulating a building energy by D.O.E. Generally, Multi air conditioner system was installed for both the cooling and the heating in a building. However, it was difficult to estimate the energy saving rate in the case of retrofitting multi air conditioner from conventional type to high efficient type. In the present study, annual energy consumptions of them were evaluated for same building and climate condition.

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