• Title, Summary, Keyword: Energy-saving

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A Simulation Study on the Energy Saving Strategy of Train Operation (에너지절약을 위한 열차운행전략에 관한 시뮬레이션 연구)

  • Joo, Young-Bhok;Choi, Kyu-Hyoung
    • Proceedings of the KSR Conference
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    • pp.1594-1598
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    • 2007
  • Energy saving is an important topic for each heavy user of the power system, including railway operators. Therefore, four strategy of train operations studied that maximum speed reduction, reduced acceleration rate, anticipatory coasting, and saw-tooth coasting for energy saving. The Simulation model of the study used to investigate the performance of a railway system, and it was used to study the effect of energy saving strategies for the train operation. The Study investigate train operation strategy for energy saving, investigate the effect of strategy, and find the energy optimization of acceleration, coasting, braking section used Run-Curve simulator from train data.

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Bayesian Statistical Modeling of System Energy Saving Effectiveness for MAC Protocols of Wireless Sensor Networks: The Case of Non-Informative Prior Knowledge

  • Kim, Myong-Hee;Park, Man-Gon
    • Journal of Korea Multimedia Society
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    • v.13 no.6
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    • pp.890-900
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    • 2010
  • The Bayesian networks methods provide an efficient tool for performing information fusion and decision making under conditions of uncertainty. This paper proposes Bayes estimators for the system effectiveness in energy saving of the wireless sensor networks by use of the Bayesian method under the non-informative prior knowledge about means of active and sleep times based on time frames of sensor nodes in a wireless sensor network. And then, we conduct a case study on some Bayesian estimation models for the system energy saving effectiveness of a wireless sensor network, and evaluate and compare the performance of proposed Bayesian estimates of the system effectiveness in energy saving of the wireless sensor network. In the case study, we have recognized that the proposed Bayesian system energy saving effectiveness estimators are excellent to adapt in evaluation of energy efficiency using non-informative prior knowledge from previous experience with robustness according to given values of parameters.

An Evaluation of Energy Saving Measures for Ocean Going Vessels

  • Kim, Yong-Wong;Kang, Dal-Won;Nam, Ki-Chan;Nam, Hyung-Sik
    • Journal of Navigation and Port Research
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    • v.39 no.2
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    • pp.107-113
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    • 2015
  • This paper analyzes and evaluates the importance of energy saving measures based on qualitative survey. Through literature review and group interviews with specialists, 4 factors, 13 measures for energy savings, and 4 evaluation criteria were selected to carry out an Analytic Hierarchy Process (AHP) analysis. At the first stage of AHP analysis, the importance of factors was derived, and then the importance of 13 measures. Lastly, the cross examination of 4 factors was carried out in order to evaluate the best possible qualitative considerations. The result revealed that 'choosing the best course weather', is the most important factor with the highest value on applicability and operational complexity criteria. These results may imply that operational considerations are regarded as a main factor to be taken into account when considering appropriate energy saving measures.

Development of Complex Energy Saving Device

  • Lee, Kwi-Joo;An, Jung-Sun
    • Journal of Ocean Engineering and Technology
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    • v.26 no.3
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    • pp.1-5
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    • 2012
  • A complex energy saving device has been developed for middle class vessels. The propulsive performance of the developed device is described through a model test. The pre-swirl stator, which recovers the rotational energy of the propeller slipstream, is a well-known energy saving device for large vessels. The pre-swirl stator for a large vessel is usually cast as a part of the stern frame and has a high cost. The manufacture of a cast stator for an existing vessel is almost impossible. The complex device that was developed can be fitted on astern frame by welding. The model tests show a 4-6% efficiency gain for middle class vessels with the developed appendages compared to those with bare hulls.

Heating Energy Saving and Cost Benefit Analysis According to Low-Income Energy Efficiency Treatment Program - Case Study for Low-Income Detached Houses Energy Efficiency Treatment Program (저소득층 에너지효율개선사업에 따른 난방에너지 절감 효과 및 경제성 분석 - 저소득층 단독주택 단열개선을 중심으로 -)

  • Kim, Jeong-Gook;Lee, Junghun;Jang, Cheolyong;Song, Doosam;Yoo, Seunghwan;Kim, Jonghun
    • KIEAE Journal
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    • v.16 no.5
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    • pp.39-45
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    • 2016
  • Purpose: The purpose of this study is to analyze the energy saving and cost benefit analysis of the Low-income Energy Efficiency Treatment Program supported by KOREF(Korea Energy Foundation). This program was launched in 2007 and performs building energy retrofit for the low-income and energy poverty houses. Method: Energy simulation and cost benefit analysis were accomplished for the low-income detached houses. The structure of detached house was a lot og block structure, wood frame (single glass) and concrete roof. Baseline model of the low-income detached houses was proposed. Result: Annual heating energy consumptions were decreased by about 3.2% with the window system replacement(Case 1), 9.3% with reinforcement of insulation(Case2), and 12.5% with both(Case 3) compared to those of baseline model. The construction cost will be recouped within 5 years for the Case 1, 3 years for the Case 2, and 3 years for the Case 3. Case 3 was the most cost beneficient construction method in the analyzed cases in this study.

A Study on the Effects of Resident Participation in Energy Saving Activities (거주자 참여형 에너지 절감 활동 효과 연구 -S대학 기숙사 거주 학생을 대상으로 한 에너지피드백 활동을 중심으로-)

  • Jung, Hye-jin;Song, Hae
    • Journal of Climate Change Research
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    • v.9 no.3
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    • pp.253-261
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    • 2018
  • As user-involved energy saving activities have become important in recent years, many forms of energy feedback experiments have been conducted. We conducted a study to determine if energy feedback activities affect energy saving for students living in dormitories at a university in Seoul. In particular, smart plugs were used for efficient research and quantitative performance measurements, and the extent of the impact of competition and rewards on participant energy saving behavior was further analyzed. The main findings of this study are as follows. First, the power usage of groups using smart plugs was lower than that of those without them. Second, energy feedback delivered to smart plug users did not have a significant impact on reduction of electric power consumption. Third, competition and compensation strategies had additional effects in reducing power usage for smart plug users. As a result, methods to deliver energy feedback more effectively as ICT technologies develop and efficient energy activities using IoT technologies can be expected to spread widely in the future.

A Study on Building Energy Saving using Outdoor Air Cooling by Load Prediction (부하예측 외기냉방에 의한 건물에너지 절약에 관한 연구)

  • Kim, Tae-Ho;Yoo, Seong-Yeon;Kim, Myung-Ho
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.29 no.2
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    • pp.43-50
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    • 2017
  • The purpose of this study is to develop a control algorithm for outdoor air cooling based on the prediction of cooling load, and to evaluate the building energy saving using outdoor air cooling. Outdoor air conditions such as temperature, humidity, and solar insolation are predicted using forecasted information provided by the meteorological agency, and the building cooling load is predicted from the obtained outdoor air conditions and building characteristics. The air flow rate induced by outdoor air is determined by considering the predicted cooling loads. To evaluate the energy saving, the benchmark building is modeled and simulated using the TRNSYS program. Energy saving by outdoor air cooling using load prediction is found to be around 10% of the total cooling coil load in all locations of Korea. As the allowable minimum indoor temperature is decreased, the total energy saving is increased and approaches close to that of the conventional enthalpy control.

A Study on Window Type Ventilation System Using IT Technology for Energy Saving in Housing Space (주거공간 내 IT기술 적용 에너지 저감 창호형 환기시스템 연구)

  • Lee, Eun-Hye;Kim, Yong-Seong;Ji, Chung-Gu
    • Journal of the Korean housing association
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    • v.24 no.2
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    • pp.61-68
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    • 2013
  • This study has the purpose to adapt IT technology on Window Type Ventilation System for the energy saving and providing of user-centered comfortable environment. This is Derived a look at the case of the window type ventilation system and researched its IT technology for reducing energy applied to the Green Home. This indicates a solution for the established Window Type Ventilation System which can not be satisfied with user's requirement by proposing Window Type Ventilation System applied to IT technology that makes it control the intelligent, combined indoor environment system and providing information. Also, it shows energy saving efficiency of Window Type Ventilation System applied to IT technology based on the model study, analysing the performance of air-conditioning and ventilation energy saving through the experiment to compare with the established Window Type Ventilation System. The result of this study has the significance that it suggests an alternative for energy saving of housing space.

A Cost Effective Energy Saving of Fluorescent Lighting in Commercial Buildings

  • Lee, Seong-Ryong;Nayar, Chemmangot V.
    • Journal of Power Electronics
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    • v.12 no.1
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    • pp.215-222
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    • 2012
  • Lighting represents a significant component of commercial buildings, particularly office buildings. Fluorescent lighting is invariably used in all commercial, industrial and residential areas. A significant amount of lighting energy is wasted every day by leaving the lights on and not utilizing daylight energy. However, if daylight illuminance can be harnessed, this will reduce the electricity consumption of fluorescent lamps and save energy. This paper explains possible significant savings in lighting energy consumption and hence in costs, without reducing the performance and visual satisfaction in office or industrial buildings. It is proposed to obtain energy saving by reducing the supply voltage without degradation in lighting performance. Experimental results confirm that as much as 20% of electrical energy can be saved by reducing about 9% of the supply voltage, without noticeably affecting light output while complying with lighting standard limits.

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)

  • Kwon, Kyung-Woo;Won, Jong-Seo
    • Proceedings of the SAREK Conference
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    • pp.33-38
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    • 2009
  • 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 $10.5{\sim}11.3%$, and cooling loads are decreased about $11.0{\sim}15.5%$ on an energy saving apartment. The heating peak load was reduced about 9.5% by insulated shades, but the cooling peak load is hardly ever decreased. Because in the condition of cooling peak load, latent cooling loads accounts for large score of cooling loads. Difference of the energy loads by a schedule control method and an outdoor detection control was no more than 5% for a base model. 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.

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