• Transactions of the Korean Society of Automotive Engineers
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• v.22 no.6
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• pp.89-95
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• 2014

This study presented the benefit of the pre-ventilation using solar sunroof with integrated photovoltaic. Recent year, auto-makers make an effort to enhance the fuel efficiency and moreover to clean the cabin passenger's health. Solar energy, one of the alternative energies, adapted in automotive air handling system, in order to pre-ventilation when vehicle parked under the sun in summer. The power generated by a prototype solar sunroof has been used to run blower in a air handing system. And the solar sunroof was installed in a vehicle, and evaluated to find out benefit of the pre-ventilation. The effect of reducing the cabin temperature about $3^{\circ}C{\sim}10^{\circ}C$ with 20 ~ 40W power generator from solar sunroof were obtained in the pre-ventilation test. This reduced thermal load can lead to the reduction of air-conditioning operation time than that of current car. Moreover, fuel economy may increase as a results of the short use of the air-conditioning time. Additionally, Total Volatile Organic Compounds in the cabin is reduced maximum 80% than that of the current vehicle.

• 한국신재생에너지학회:학술대회논문집
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• 2009.11a
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• pp.133-133
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• 2009

연료전지는 연료의 화학적 에너지를 전기화학 반응을 통하여 직접 전기로 변환하기 때문에 에너지 전환효율이 높고 공해물질을 배출하지 않는 환경친화적인 고효율 발전방식으로, 특히 용융탄산염 연료전지(MCFC) 및 고체산화물 연료전지(SOFC)같은 고온형 연료전지의 경우 분산전원이나 중앙집중발전 같은 발전용에 적합한 연료전지로 평가받고 있다. 현재 MCFC 및 SOFC등의 발전용 연료전지 시스템의 효율은 약 50% 정도이며, 시스템의 발전효율을 높이기 위한 여러 연구가 진행되고 있다. 그 중에서 고온의 배열을 이용하여 연료전지 발전시스템의 효율을 향상시키기 위해 FuelCell Energy, Ansaldo Fuel Cells 및 Simens Westinghouse 등에서 수백 kW급의 fuel cell - gas turbine hybrid system에 대한 상용화 수준의 실증연구가 진행되었다. 본 연구에서는 발전용 연료전지 시스템의 발전효율을 높이기 위한 방안 중 하나로 배열을 이용하여 steam을 발생시켜 air amplifier에 사용함으로써 연료전지 시스템의 MBOP(Mechanical Balance of Plant)중 전력을 소비하는 air blower를 대체하여, 시스템 효율을 향상시키고 시스템의 가용성을 높일 수 있는 설계안에 대하여 논하고자 한다.

• Journal of the Institute of Convergence Signal Processing
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• v.16 no.2
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• pp.74-82
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• 2015

In this study, a BMW plant process control system model which produces BMW is suggested and the BMW plant process controller with the following functions is developed. The first function is to operate the electronic overload relays to stop the blower for a certain period of time and to re-operate it again when the blower is overloaded. The second function is to close the motor operated valve automatically in case of power failure to prevent the circulation from the guided tank to the compost throwing tank and to block leak from the compost throwing tank due to the failure of ball valve. The third function is to transfer produced BMW from the concentration tank to 4 storage tanks for automatic managing of the BMW output. A device to measure the signal of the BMW plant process controller and a test equipment are developed. The designed BMW plant process controller is checked to see if it operates correctly according to the design specifications. The sequence control method based on BMW plant process controller is developed at a low cost in this study, so it is expected to bring improvements in the stability and the efficiency of system and to cause reductions in the operation and the management costs in the future.

• Journal of the Korea institute for structural maintenance and inspection
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• v.24 no.2
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• pp.9-14
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• 2020

Four developed patents have applied for a new type of Composite Cyclone Scrubber followed by the previous research (Cho and Kim, 2017), including dust reducing fan with filters. Regarding target installation and maintenance cost, 64% reduction for investment costs (6.2 billion won vs. 17 billion won) compared to existing road pollution reduction system, while social benefit costs increase by 43% compared to existing road pollution reduction measures (72.6 billion won vs. 50.8 billion won). The composition of the device is an air blower type spiral guide vane, and an injection pressure collecting dust efficiency. A nozzle varies Injection angle and contact range, spray liquid species (waterworks, salty water). The proposed patent tests are circulation water Time-by-Time Spray and collected 41.4% more increased micro dust since the sprayed water meets contaminated gas due to the 45° degree colliding, which is 141% increased conventional dust collector. (Ratio of collection over 85%). As regards the source of collection liquid, circulated rainwater and well water, we expect a huge amount of energy and economically saved eco-friendly system in our patent. Finally, the guided vane and metal filter reduced over 90% micro-dust, while sprayed water cleans the vane and filters, resultantly minimizing the maintenance budget. The preliminary evaluations of the developed design make it possible to reduce not only cheaper maintenance budget due to the characteristic water spraying but the cost of water comes from mainly rain and underground.

• Proceedings of the KIPE Conference
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• 2011.07a
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• pp.533-534
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• 2011

본 논문은 고속블로워 시스템용 2상 4/2 SRM(Switched Reluctance Motor)과 3상 6/2 SRM의 토크 리플 최소화를 위한 가변 공극형 회전자 타입을 제안하고 그에 대한 특성 해석을 수행하였다. 연속적인 토크를 얻기 위하여 정 토크 구간을 확장할 수 있는 형상을 적용하고 고속에서의 리플을 최적화 할 수 있는 가벼 공극형 구조를 제안하였다. 기존에 제안되어진 2상 고속 4/2 SRM의 특성과 제안된 3상 고속 6/2 SRM의 특성을 FEM(Finite Elements Method) 해석을 통하여 비교해봄으로 고속에서의 개선된 토크 리플을 검증하였다.

• Journal of Advanced Marine Engineering and Technology
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• v.35 no.5
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• pp.640-646
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• 2011

Dissolved oxygen (DO) refers to the volume of oxygen that is contained in water, and is a major indicator of water quality. The objective of this paper was to investigate the effect of salinity on the dissolved oxygen characteristics in an ejector-aerator. An experimental aeration system composed of a motor-pump, an ejector, a motor-blower, a set of aeration and recirculation tank and a control panel. The dissolved oxygen concentrations decreased with the water salinity. The volumetric mass transfer coefficient increased with increasing the water salinity.

• Proceedings of the KIPE Conference
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• 2004.07a
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• pp.195-195
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• 2004

Conventional dryer systems use one induction motor to drive drum and fan. However, nowadays, dryer systems are necessary to use extra fan motor for reducing a drying-time. This fan motor should be variable-speed controlled motor to control drying-time according to the volume of clothes. This paper proposes 3-phase SRM(Switched Reluctance Motor) having 12/8 structure for variable-speed fan motor of dryer system.

• 유체기계공업학회:학술대회논문집
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• 2000.12a
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• pp.99-103
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• 2000

This paper describes the development of standard series for turbo blowers. In mass production system, it is very required to standardize blowers to improve the productivity of ordering, estimating, manufacturing. To standardize blowers, we performed researches on the effects of $b_1$(impeller inlet width), $b_2$(impeller outlet width), ${\beta}_1$(blade inlet angle), ${\beta}_2$(blade outlet angle), Z(number of blades) of impellers and geometry of casing experimentally. Through this study, we chose the several best model of turbo blowers with high efficiency and low noise, which represent each specific speed series 63, 80, 100, 125, 160, 200, 250, 315. After the development of such standardized blowers, the test results are used to prepare the fan geometry and performance database for a selection software.

• Proceedings of the KSME Conference
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• 2002.08a
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• pp.729-732
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• 2002

This paper reports an experimental study around a module about forced air flow by blower($35{\times}35{\times}6mm^3$) in portable PC(10mm high, 200mm wide, and 235mm long). The channel inlet flow velocity has been varied between 0.26, 0.52 and 0.78m/s. The power input to the module is 4Wthis report, particular attention is directed to the fluid flow and adiabatic wall temperature($T_(ad)$) around a module which is under fluid mechanical and thermal influences of the module. The fluid flow around a module was visualized using PIV system. Liquid crystal thernography is used to determine the adiabatic wall temperature around a heated module on an acrylic board. Plots of $T_(ad)$ (or F) show marked effects of dispersion of thermal wake near the module.

• Journal of Mechanical Science and Technology
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• v.14 no.12
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• pp.1376-1385
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• 2000

This study investigates spray characteristics before and after wall impingingment of gasoline spray in suction air flow. For this study, a rectangular model intake port was made of acrylic glass, and suction air was generated by using the forced air blower contrariwise. The injector for this study was a pintle-type port gasoline injector in which an air-assist adaptor is installed to supply assisted air. A PDPA system was employed to simultaneously measure the size and velocity of droplets near the wall. Measured droplets are divided into "pre-impinging droplets"with positive normal velocity and "post-impinging droplets"were negative normal velocity for the suction flow. The velocities, size distributions and Sauter mean diameter(SMD) of pre-and post-impinging droplets for varions injection angles and air-assists are comparatively analyzed.