• 교육시설
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• 제16권1호
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• pp.43-50
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• 2009

This research is to analyze LCC of Heat Pump system in university building by reduction of electric power costs for education and incentive system for gas. Produced details item different expense of EHP and GHP equipment construction step and preservation administration step. Analysis result is as following. 1) Executed LCC analysis for target system after lowering whole curriculum reduction of electric power costs for education. Analysis result, energy cost-cutting effect of EHP appears greatly than GHP unlike existent study finding, EHP decided by economical system. 2) Sensitivity analysis executed by incentive 500,000 won per units and geometrical ration of gas expense by 1%. As a result, because lowering effect of electric charges appears greatly, EHP decided by more economical system than GHP. As research result of front is different from existent study finding, EHP by lowering of electric charges for alteration and education of governmental frequent volunteer system was decided by more economical system than GHP.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 B
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• pp.800-802
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• 2004

When an accident is happen due to using a bad Wire Compressor, some public resentments are caused and It cause lawsuit for we. In case, we will undergo a colossal financial loss. in addition to, Guide to improve quality of operation by using the number of times of pressing and pressing pressure with cooperative private enterprise. And because of needs for Thermal, Electrical and Chemical factor analysis of connection point of sleeve, expect to try improving problems of wire presser whole our company. We expect that reduce fault and save cost by this process. Consequently, we will prevent power losing and black out due to line faults by expulsion of inferiority equipment and prevent heating and line fault. This is possible using Alarming and Auto Locking Wire Compressor that is improve on this study.

• KIEAE Journal
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• 제13권4호
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• pp.43-48
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• 2013

The effect of climate change has influenced humanity and ecosystem with tremendous changes in temperature. For the past 150 years, the national annual average temperature is 0.6 degree increased and the heating degree day reduced from April to November. However, December to January, the climate change was generated and the heating degree day increased. The blackout occured in 2011 and 2012 by increasing electricity consumption of heating and cooling equipment to the effects of climate change. That is because heating load accounted for 20% of building electric use. In this study, strengthening measures to reduce heating energy consumption is presented due to climate change in winter since 1980 to prevent blackout and reliable power supply for the building energy-saving design standards by Meteorological data provided by the National Weather Service were calculated using the heating degree days in order to present eighteen cities from 1980 to 2012. Insulation standards are presented to prevent black-out by the heating degree days. the heating energy demand was reduced almost 6% including 10% in Central, 5% in South and Jeju area based on strengthening of the insulation. It is applied to the entire country an annual economic effect of 250 billion won, and black-out can be prevented.

• 전기학회논문지
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• 제66권11호
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• pp.1669-1674
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• 2017

In this study, We have discussed the development of a diagnostic device to detect and prevent electrical fire due to the arc caused by contact failure and partial disconnection at the connection part of the three-phase electric heater wiring used in the industrial field. The arc caused by contact failure and partial disconnection at the connection part of the electric heater shows a change in the current effective value. Therefore, it is possible to determine whether there exists a defect by analyzing the current unbalance factor and the number of current fluctuations with the diagnostic apparatus. The three-phase unbalanced heater is considered to be capable of determining defects through periodic measurement and trend analysis of the current unbalance factor. It is also expected that this device can be used not only for electric heaters but also for detection of defects in wiring and connections of electrical equipment having a characteristic of constant load current.

• Korean Journal of Acupuncture
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• 제40권4호
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• pp.135-140
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• 2023

Objectives : Moxibustion-related standards have been established by organizations such as the International Organization for Standardization (ISO) and the Korean Standards Association (KSA), among others. Methods : We summarized moxibustion-related standards that have been published by ISO and KSA. Results : Technical Committees 249 (ISO/TC 249), which was established in 2009, has been established moxibustion devices standards in working group (WG) 4. International standards have been established for moxibustion devices, smokeless moxibustion devices, moxa floss quality, and electric heating moxibustion equipment. Work on international standards for infrared moxibustion-like instruments and moxibustion device terminology is currently in progress. Conclusions : Korea has taken a central role establishing international standards for a wide range of moxibustion devices, supported by fundamental research data in this field. To continue its influence in establishing these international standards, further studies providing the basis for moxibustion device standardization are required.

• 에너지공학
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• 제5권2호
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• pp.183-192
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• 1996

지역난방과 발전겸용의 열병합발전(CHP)시스템과 보조열원설비의 최적운전패턴을 결정하기 위한 수리적 모델을 구축하였다. 현실상황에 접근하여 사회전체, 전력회사 및 난방사업자 각각의 관점에서 최적화 모델이 구성되었다. CHP 시설과 보조열원의 운영권이 다른 경우, 최적운전패턴은 각 당사자의 목적함수에 따라 다르며, 여기에는 열거래요금이 결정적인 영향을 미친다. 본 논문에서는 사회전체 차원의 최적운전패턴을 도출하고, 이러한 패턴이 자율적으로 이루어지게 하는 열요금 구조를 제시하였다. 분석 결과, 사회적 관점에서의 최적화패턴에서는 보조열원의 활용이 중요하게 나타났으며, 현행의 균일 열요금 구조를 시간대별로 차등화된 열요금 구조로 변환할 경우, 자발적으로 시스템전체 차원의 최적화가 이루어질 수 있음이 발견되었다.

• 설비공학논문집
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• 제24권3호
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• pp.205-211
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• 2012

Unlike the previous approaches, we analyzed for economic efficiency of renewed heating and cooling systems as the characteristics of space. The purpose of this study is to analysis the energy consumption and economical efficiency of absorption chillers and EHP systems in renovated library. It is important that equipment selection should be considering energy cost as well as space program. In recently, many EHP systems were installed in the building for reducing the energy cost and for seeking the convenience of individual control. In contrast, though absorption chillers have the disadvantage of a central control, absorption chillers are appropriate for the conditions of the library that needs simultaneous operation. The results by payback period method, show that selection of heating and cooling systems should be consider for space program and the characteristics of space.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.973-976
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• 2011

본 논문에서는 연소기 엔진 연소시험 설비용으로 사용되는 비연소식 전기히터의 특정부위에서 코일이 파단되는 현상이 연속적으로 발생함에 따라 원인 규명을 목적으로 히터에 대한 복합 열유동해석을 수행하었다. 수행 결과, 히터의 파단이 발생하는 코일 입구 직선구간에서 코일의 온도가 국부적으로 크게 상승함에 따라 열 및 구조적으로 취약하다는 것이 판명되었으며, 이의 원인은 이 영역 부근에서 공기 유속이 매우 낮았기 때문이었다. 코일을 하류로 25mm 이동하였고 이를 통해서 코일 입구 직선부분에서의 공기의 유속이 증가됨으로 코일온도를 감소시킬 수 있었고, 코일의 열 및 구조적 안정성을 확보할 수 있었다.

• 한국세라믹학회지
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• 제38권4호
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• pp.307-307
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• 2001

Combustion process with citrate was used to produce the LiMn$_2$O$_4$powder. Precursors are pre-ignited in open air followed by post-heating in the range from $600^{\circ}C$ to 80$0^{\circ}C$ for 4h. With varying the molar ratio (R) of ethylene glycol (EG) to citric acid (CA) from 0 to 4, the effect of EG content on powder characteristics is evaluated. Vacuum drying promote the auto-ignition at room temperature. With small addition of EG metal ion was selectively segregated with organic substances and undesired lithium evaporation occurred during post-heating. LiMn$_2$O$_4$phase which is produced by combustion reaction was decomposed back to Mn$_3$O$_4$because the reaction temperature was higher than 95$0^{\circ}C$. With increasing EG content, the homogeneity of LiMn$_2$O$_4$powder increased and specific surface area increased. And lithium evaporation during vacuum drying and/or ignition also increased.

• 설비공학논문집
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• 제17권1호
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• pp.82-87
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• 2005

The purpose of this study is to suggest the characteristics and actual state of energy consumption by the analysis of energy consumption data in an office building. This study examines and analyzes daily and monthly energy consumption of an office building located in Seoul, Korea regarding type of load and business classification within a building. The results are as follows. 1) Energy consumption of office building for each type of load show similar consumption patterns, regardless of seasons such as cooling period and heating period. 2) Out of all annual energy consumption, consumption for lighting took about $43\;\%,$ general electric Power about $23\;\%,$ emergency power $25\;\%,$ computer center $5\;\%$ and cooling power $4\;\%,$ showing that the consumption for lighting was highest, and the percentage of energy consumption for cooling power for operation of cooling facilities took the lowest percentage. 3) Annual gas consumption used for heating and hot water supply were $38,\;36\;\%$ for officetel and office respectively, and $26\;\%$ for arcade. 4) Electricity consumptions used for cooling power for each use of building, office and officetel recorded in July and August of cooling seasons. Even though it shows different patterns for each month, energy consumption showed unique pattern throughout the cooling seasons.