• 조명전기설비학회논문지
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• 제26권3호
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• pp.24-30
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• 2012

A proposed the electrical fan heater using induction heating is innovative system which applied IH(Induction Heating) magnetic induction heating generated from induction-heated metallic package and high-frequency power circuit technique for thermal converse technique. In this occurs not burning, so that the working environment and deterioration of products can be improved. The existing heater that low efficiency by heated resistance or using fossil fuel of coal, diesel, kerosene has problems about burden for high cost price. In this paper are compared efficiency the existing heaters and designed electrical fan heaters using 3[kW]-Class full-bridge resonant inverter. In addition, action analysis and application of system are discussed.

• 유체기계공업학회:학술대회논문집
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• 유체기계공업학회 2006년 제4회 한국유체공학학술대회 논문집
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• pp.253-256
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• 2006

Most heater being used in vehicles has been used to a cabin heating by being supplied from a heat loss of the engine coolant for heat source efficiency. Recently, the heat loss is reduced by high efficiency in the engine. It becomes to require the combustion heater that directly bums the heater used in vehicles to provide heat source of the heater. The purpose of this study is to research a burner which will applicate combustion heater by the numerical analysis. There are the 5 different types of burners, which is designed by differently each design of the swirler. N-DODECANE by used the burner fuel is performed by numerical analysis in every 5 burner. The burner's efficiency testing is evaluated on the basis of the Exhaust gas temperature.

• 사물인터넷융복합논문지
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• 제7권3호
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• pp.63-68
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• 2021

국내의 전기히터 제조업체에서는 기존 제품의 효율을 향상시키는 기술 개발에 집중하고 있다. 선박 연료용 전기히터는 그 크기가 크고 소형화/고효율화에 대한 난이도가 높아 아직까지 기술개발을 시도하는 기업은 많지 않은 실정이다. 기존의 전기히터는 선박 엔진 연료의 유동경로가 단조롭기 때문에 가열매체의 열교환 튜브와의 접촉시간이 매우 짧아 가열 효율이 낮은 구조이며, 관형으로 제작되어 있기 때문에 가열효율과 무관하게 부피가 매우 크게 제작되므로 가열장치의 설치공간을 확보해야 한다. 이로인해 해외 선진사에서 적용하고 있는 관형 전기히터 장치는 내부의 특정부분이 손상되었을때 관형 가열기를 모두 분해하여야 하고, 열교환 튜브가 손상된 경우에는 열교환 튜브를 모두 분해해야 하므로 유지와 보수에 어려움이 있다. 본 연구에서는 250kW 용량급 판형 전기히터 가열기를 통해 시간당 10ton의 선박 엔진 연료를 가열할 수 있고, 최대온도를 150℃까지 설정할 수 있는 판형 전기히터에 대한 기초연구를 수행하였다.

• 설비공학논문집
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• 제25권5호
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• pp.225-232
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• 2013

Heat pump systems have been widely adopted in buildings for cooling and heating, due to their higher energy efficiency. Recently, the demand for hot water supply from the heat pump system has been increasing. To increase the water supply temperature with higher system efficiency and reliability, a heat pump water heater adopting cascade cycle was investigated in this study. The cascade heat pump water heater consisted of a low-stage cycle using R410A, and a high-stage cycle using R134a. A simulation program for the cascade heat pump water heater was developed, and verified by comparison with experimental data. The performance of the cascade heat pump water heater was optimized, by varying the compressor rotating speeds of the low- and high-stage cycles. At low ambient temperatures, the performance of the cascade cycle was compared with that of the single-stage cycle. The system efficiency of the cascade cycle was higher than that of the single-stage cycle, showing a lower compression ratio and compressor discharge temperature.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 하계학술대회 논문집 D
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• pp.2310-2312
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• 2004

In Korea Electric Power Corporation (or KEPCO), several Demand-Side Management (or DSM) program have been carried out to effectively meet electric power demand at least costs by modifying customers electricity use patterns. As one of them, KEPCO applies low-priced night thermal-storage power service for heat appliances to facilitate efficient use of power facilities by shifting relatively high daytime demands to night hours to build loads during the off-peak periods. In the market of heat-storage type water-heater, electric water-heater has been mostly used, but it has low energy efficiency and needs high capacity electric equipments. So in order to replace these electric water heaters, 15 HP air-source heat pump water heater is developed in Korea Electric Research Institute (or KEPRI). This paper shows that measurement system for performance testing of heat pump water heater is established and heating capacity and performance is analyzed and measured for out-door environmental change.

• 설비공학논문집
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• 제8권3호
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• pp.351-360
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• 1996

This study focuses on the development and evaluation of the high efficiency absorption chiller-heater, which can be applied to a direct gas fired, double effect system with 40RT (508,000kJ) cooling capacity. The performance of the absorption chiller-heater is investigated through cycle simulation and experiment to obtain the system characteristics with the inlet tenperature of cooling, chilled water, and gas input flow rate. The efficiency of the different cycles has been studied and the simulation and experiment results show that higher coefficient of performance could be obtained for mixed flow cycle. The five percent difference was obtained from the comparison between experimental and cycle simulation results. As a result of this study, the optimum designs were determined based on the operating conditions and the coefficient of performance.

• 한국자동차공학회논문집
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• 제14권1호
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• pp.183-190
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• 2006

For continuously regenerative PM collecting system which adopted thermally stable SiC DPF and electrical heater which was placed upstream of the filter and driven by well constructed control logic, PM oxidation characteristics were investigated varying air flow rate, amounts of PM accumulated on the DPF and filter inlet temperature in order to get optimized PM regeneration performance. This study showed that the operating condition of air flow rate 70 lpm, high PM loading around 30g and filter inlet temperature $700^{\circ}C$ with heat insulation was effective in achieving high regeneration efficiency. Also, in this condition, we could decrease the electric energy consumption by reducing the regeneration time.

• 한국산업융합학회 논문집
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• 제10권1호
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• pp.21-26
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• 2007

As DDI or GDI engine discharges very low heat due to its high thermal efficiency, the heat source is not enough for heating the passenger compartment in cold climate condition. To remedy the heating problem, the conventional HFC-134a automotive air-conditioning system has been attempted to run as a heat pump mode. Futhermore, an auxiliary electric heater of new type was equipped to the heat pump air-conditioning loop as a new approach. Hence, a proto-type heat pump air conditioner has been made and tested to investigate the feasibility of the HFC-134a automobile air-conditioning system that could be worked as a heat pump. The experiment results showed that the sufficient heating capacity could be obtained by adding a heat pump with an new electric type auxiliary heater into the conventional heat core in low temperature condition.

• 한국전자통신학회논문지
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• 제12권6호
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• pp.1151-1158
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• 2017

히트파이프 일체형 고효율 난방기는 겨울철 시설원예 내 작물생육에 필수인 난방장치와 배기열 회수기를 일체화하여 배기열이 외부로 배출되기 전 미사용 에너지를 재이용하는 장치이다. 시설원예, 유리온실 등 점검을 통해 우리나라 농업용 난방기의 문제점을 파악하였고, 개선방향을 찾아 시설원예 및 하우스에 맞는 최적화된 농업용 고효율난방기 및 스마트 제어시스템을 제안하였다.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2004년도 추계학술대회 논문집
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• pp.156-161
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• 2004

The application of solar energy, in the field of alternative energy, was on the increase tendency. In the case of advanced nations, through continuous R&D, solar hot water heater with high efficiency has been used for the house and the industrial process on business, advanced nations were reached up the experimental stage of solar generation system. But, the actual circumstance of the domestic has been not accomplished the popularization of solar hot water heater and the settlement of it which is the fundamental stage of the solar energy usage. This trouble, the domestic was flooded with small enterprise for producing solar hot water heater, was caused by the popularization and the production without verification of performance. To supply the monitoring program for evaluating solar hot water heater, this research was purpose to improve the technical development of the enterprise for producing solar-heat hot-water-boiler and served as an aid for the enlargement and the popularization on solar energy.