• Title, Summary, Keyword: Energy-saving

Search Result 2,522, Processing Time 0.045 seconds

Evaluation of Lighting Energy Saving Rate in a Small Office Space (소규모 사무공간의 조명에너지 절감율 평가에 관한 연구)

  • Kim, Han-Yong;Yun, Gyeong;Kim, Kang-Soo
    • Journal of the Korean Solar Energy Society
    • /
    • v.32 no.3
    • /
    • pp.50-58
    • /
    • 2012
  • The objective of this study is to evaluate the lighting dimming rates with various parameters of the building skin in a small office. We compared to simulated workplane illuminance and measured workplane illuminance for the base model. After that, the five veriables(the presence of vertical wall in double skin facade, the presence of windowsill, window to wall ratio(WWR), window visible transmittance, the width of double skin facade) were applied to base model, and we analyzed the simulated lighting energy saving rates. The results are listed as below. The simulated workplane illuminance results are similar to the measurement. Simulated illuminance was smaller than measured illuminance by 16.5%(60 lx). In accordance with applicable building skin parameters, lighting energy saving rate results are summarized as follows. Lighting energy saving rate of case1(windowsill height 0.7m) is higher than that of base case(windowsill and vertical wall) by 7.3% and the lighting energy saving rate of case2(no vertical wall) is higher than that of base case by 7.6% and the lighting energy saving rate of case3(no windowsill and vertical wall) is higher than that of base case by 12.4%. The lighting energy saving rate is increased by 2.3%, when window visible transmittance is increased from 70% to 86%. The lighting energy saving rate is increased by 4.6%, when we changed the WWR 70% to 90%. lighting energy savings rate is increased by 6.5%, when the width of double skin facade is reduced from 1m to 0.3m.

Utility AC Frequency to High Frequency AC Power Frequency Converter without Electrolytic Capacitor Link for Consumer Induction Heating Appliances

  • Sugimura, H.;Eid, A.;Lee, H.W.;Kwon, S.K.;Suh, K.Y.;Nakaoka, M.
    • Proceedings of the KIEE Conference
    • /
    • /
    • pp.1364-1367
    • /
    • 2005
  • In this paper, a novel prototype topology of soft switching PWM controlled high frequency AC power conversion circuit without DC voltage smoothing chemical capacitor filter link from the voltage grid of utility frequency AC power supply source with 60Hz-100V or 60Hz-200V is proposed and introduced for innovative consumer induction heating(IH) boiler applications as hot water producer, steamer and super heated vapor steamer.

  • PDF

Character Analysis of 1.2kW Proton Exchange Membrane Fuel cell (1.2kW 고분자 전해질형 연료전지 특성 분석)

  • Kim, Sung-Jun;Choi, Kwang-Ju;Kwon, Soon-Kurl;Suh, Ki-Young;Nakaoka, M.;Lee, Hyun-Woo
    • Proceedings of the KIPE Conference
    • /
    • /
    • pp.781-784
    • /
    • 2005
  • This paper is aimed at presenting a proton exchange membrane ( PEM ) fuel cell stack. The fuel cell electrical output voltage and current (V-I) characteristic is described for the first time by a simplified closed form suitable. The characteristics obtained from the simulation are compared with the experimental results on a Ballard commercial fuel cell stack as well as to the manufacturer given data.

  • PDF

The Energy Saving for Separately Excited DC Motor Drive via Model Based Method

  • Udomsuk, Sasiya;Areerak, Kongpol;Areerak, Kongpan
    • Journal of Electrical Engineering and Technology
    • /
    • v.11 no.2
    • /
    • pp.470-479
    • /
    • 2016
  • The model based method for energy saving of the separately excited DC motor drive system is proposed in the paper. The accurate power loss model is necessary for this method. Therefore, the adaptive tabu search algorithm is applied to identify the parameters in the power loss model. The field current values for minimum power losses at any load torques and speeds are calculated by the proposed method. The rule based controller is used to control the field current and speed of the motor. The experimental results confirm that the model based method can successfully provide the energy saving for separately excited DC motor drive. The maximum value of the energy saving is 48.61% compared with the conventional drive method.

Energy Efficiency Evaluation of IT based Ship Energy Saving System-(2) : Ship Test Results (IT기반의 선박에너지절감시스템 성능평가 방법-(2) : 해상시험 수행 결과)

  • Yoo, Yun-Ja
    • Journal of Navigation and Port Research
    • /
    • v.40 no.4
    • /
    • pp.165-171
    • /
    • 2016
  • SEEMP (Ship Energy Efficiency Management Plan) has entered into force since 2013 for the reduction of GHG emission of operating ships. SEEMP guidelines include the hardware modification or installation of energy-saving device on ship. It also includes software based energy-saving technology such as optimum routing, speed optimization, etc. Hardware based technologies are not easy to apply to ongoing vessel due to the operational restriction. Therefore, IT based energy-saving technology was applied and its energy efficiency was evaluated using before and after energy-saving system applied voyage data. SEEMP advises a voluntary participation of EEOI (Ship Energy Efficiency Operation Indicator) use as an indicator of ship energy efficiency operation, and those results were also shown to evaluate the improvement efficiency of energy-saving system.

An Analysis on the Effects of Energy Conservation Consciousness on Korean Energy Saving Behavior - Through Mediating by Energy-Relating Broadcasting Type - (한국인의 에너지 절약의식이 에너지 절약행동에 미치는 영향 분석 - 에너지관련 방송의 유형별 매개효과 -)

  • Park, Jung-Il;Park, Jung-Gu;Lee, Jung-Ho
    • Journal of Broadcast Engineering
    • /
    • v.23 no.6
    • /
    • pp.836-854
    • /
    • 2018
  • This study is analyzing the effects of energy conservation consciousness on Korean energy saving behavior through the mediating effects of energy-related broadcasting media, such as TV. The study is carried out through the survey with structured questionnaire for each factors, using a mediating analysis based on PROCESS Macro proposed by Hayes (2013). The results of the study have been found that people with higher energy conservation consciousness displayed energy saving behavior more frequently and more actively for energy saving behavior as they were more exposed to energy-related broadcasting media. By energy-related broadcasting media the effect of energy public service ad and campaign was the largest at 15.3%, followed by energy news at 12.1%. But energy documentary has no effect on energy saving behavior. Based on the results of this analysis, it is necessary to establish a broadcasting policy that enhances the frequency of energy-related broadcasting media and energy documentary that can induce energy saving behavior. It is also necessary to make efforts to increase the reliability of analysis through empirical data such as electricity bills and fuel cost which show the actual saving level by energy saving behavior.

A Study on Reduction of Energy and CO2 Emission by Using Regenerative Energy of Electric Vehicle (전동차 회생 에너지활용에 따른 에너지 및 CO2 절감 분석에 관한 연구)

  • Kim, Chul-Sub;An, Cheon-Heon;Lee, Byung-Song;Lee, Hi-Sung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
    • /
    • v.24 no.9
    • /
    • pp.85-96
    • /
    • 2010
  • The recent environmental protection trend requires more strict energy saving, therefore every transportation system should reduce energy consumption to the minimum value. High-efficiency operation system, energy saving and $CO_2$ emissions shall be addressed as important issues in railway system. These issues are the most essential factors of railway, compared to major public transportation system. Recently, saving energy in the electric railway system has been studied. The efficient use of regenerated energy is considered to save energy. Namely, Using regenerative energy is that to store the energy generated during braking and discharge it again when a vehicle accelerates. Reusing energy stores and discharges energy, consequently enables a complete exchange of energy between vehicles, even if they are not braking and accelerating at precisely the same time, as is most frequently the case in everyday service. This paper analyzes effects of energy saving and $CO_2$-cut by using regenerative energy of electric vehicles.

Simultaneous water and energy saving of wet cooling towers, modeling for a sample building

  • Ataei, Abtin;Choi, Jun-Ki;Hamidzadeh, Zeinab;Bagheri, Navid
    • Advances in environmental research
    • /
    • v.4 no.3
    • /
    • pp.173-181
    • /
    • 2015
  • This article outlines a case study of water and energy savings in a typical building through a modelling process and analysis of simultaneous water-energy saving measures. Wet cooling towers are one of the most important equipments in buildings with a considerable amount of water and energy consumption. A variety of methods are provided to reduce water and energy consumption in these facilities. In this paper, thorough the modeling of a typical building, water and energy consumption are measured. Then, After application of modern methods known to be effective in saving water and energy, including the ozone treatment for cooling towers and shade installation for windows, i.e. fins and overhangs, the amount of water and energy saving are compared with the base case using the Simergy model. The annual water consumption of the building, by more than 50% reduction, has been reached to 500 cubic meters from 1024 cubic meters. The annual electric energy consumption has been decreased from 405,178 kWh to 340,944 kWh, which is about 16%. After modeling, monthly peak of electrical energy consumption of 49,428 has dropped to 40,562 kWh. The reduction of 18% in the monthly peak can largely reduce the expenses of electricity consumption at peak.

Analysis of Saving Rates according to Energy Consumption Factors in Office Building (사무소 건물의 에너지 소비 요소별 절감률 분석)

  • Park, Byung-Il;Yang, In-Ho
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
    • /
    • v.28 no.3
    • /
    • pp.115-122
    • /
    • 2016
  • In this study, 21 energy reduction factors were selected as architecture, system & operation, and lighting and equipment parts to analyze reduction method of the load occurring in office buildings. Energy consumption simulation was performed. In the architecture part, saving rate (1.53%) of "occupant density" factor was the most efficient. In the system and operation part, saving rate (1.28%) of "interior VAV and exterior FPU type" factor was the most efficient. In case of lighting and equipment part, saving rate (12.42%) of "schedule" factor was the most efficient. In the three parts, saving rate of the lighting and equipment part was 27.32%. This was caused by the "schedule" factor. Saving rates of the architecture part and the system and operation part were 3.39% and 1.20%, respectively.

A Study on Economic Evaluation and Energy Efficiency for the Installation of Water Control Device in Building (급수제어장치 설치에 따른 건축물의 에너지 효율 및 경제성 평가)

  • Park, Kang-Hyun;Cha, Jung-Hoon;Kim, Su-Min
    • 한국태양에너지학회:학술대회논문집
    • /
    • /
    • pp.338-341
    • /
    • 2011
  • Water usage for cleaning the toilet bowl accounts for 27% of the total water usage. Water-saving valve that can select the amount of water for cleaning toilet bowl can be reduced expenditure. After installing water-saving valve, analysed the economic effects. Water-saving valves compared with flush valves, and researched the amount of water usage. Then analyzed fort he economic effects. Water-saving valve was used 5.6 ${\ell}/time$ for cleaning toilet bowl. In contrast, flush valve was consumed 8.4 ${\ell}/time$. Water-saving valve's water-saving rate was 33.3%. The initial payback period for Water-saving valve was 459.5 days. By a small investment in water saving valve, the economic benefits can be obtained.

  • PDF