• 제목/요약/키워드: Electric power duct

검색결과 33건 처리시간 0.022초

포물선형 월류파력발전장치에 대한 수치해석 (Computational Analysis of Parabolic Overtopping Wave Energy Convertor)

  • 류진;현범수;김길원
    • 한국해양환경ㆍ에너지학회지
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    • 제12권4호
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    • pp.273-278
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    • 2009
  • 월파형 파력발전장치는 월류된 파랑으로 인하여 발생한 수두차를 이용하여 터빈을 구동하는 일종의 파랑에너지 변환장치로써 파랑에너지를 전기 에너지로 변환하는 장치이다. 본 연구는 상용 CFD코드 인 Fluent를 사용하여 수치 조파수조를 구현하여 월파형 파력발전장치의 해석에 도입을 하여 입사파 조건과 형상에 대한 계산을 수행하였다. 최적의 월류성능을 나타내는 구조물 사면형상을 도출하기 위하여 직선형과 포물선형을 채택하여 비교분석을 수행한 결과 포물선형 사면경사를 갖는 구조물이 더 우수한 월류성능을 보인다는 것을 확인 하였다.

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2인승 틸트로터형 PAV 개념설계 및 공력해석 (Conceptual Design and Aerodynamic Analysis of Double-Seater Tilt-rotor Type PAV)

  • 조윤성;김성지;백수빈;김영채;배근학;조은별;유지수;홍영훈
    • 한국항행학회논문지
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    • 제26권3호
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    • pp.144-160
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    • 2022
  • 차세대 이동 수단의 방법으로 도심항공 모빌리티(UAM)에 관한 연구가 활발하게 진행되고 있다. 도심항공 모빌리티에 사용할 비행체인 eVTOL(Electric Vertcial Take-Off and Landing)은 추진방식에 따라 복합형, 틸트 로터형, 틸트 날개형, 틸트 덕티드 팬형, 멀티콥터형으로분류된다. 본 연구에서는 새로운 틸트 로터형의 차세대 eVTOL을 기존의 설계 요구 조건에 맞게 개념설계를 수행하였다. 공력해석 프로그램인 Open VSP와 XFLR5를 사용하여 공력해석을 진행하였다. 각 임무 구간별 소요되는 동력을 계산하였고, 그에 맞는 배터리와 모터를 선정하였으며, 구성품별 중량을 추정하여 최대이륙중량을 예측하였다.

설비공학 분야의 최근 연구 동향: 2014년 학회지 논문에 대한 종합적 고찰 (Recent Progress in Air-Conditioning and Refrigeration Research: A Review of Papers Published in the Korean Journal of Air-Conditioning and Refrigeration Engineering in 2014)

  • 이대영;김사량;김현정;김동선;박준석;임병찬
    • 설비공학논문집
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    • 제27권7호
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    • pp.380-394
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    • 2015
  • This article reviews the papers published in the Korean Journal of Air-Conditioning and Refrigeration Engineering during 2014. It is intended to understand the status of current research in the areas of heating, cooling, ventilation, sanitation, and indoor environments of buildings and plant facilities. Conclusions are as follows. (1) The research works on the thermal and fluid engineering have been reviewed as groups of heat and mass transfer, cooling and heating, and air-conditioning, the flow inside building rooms, and smoke control on fire. Research issues dealing with duct and pipe were reduced, but flows inside building rooms, and smoke controls were newly added in thermal and fluid engineering research area. (2) Research works on heat transfer area have been reviewed in the categories of heat transfer characteristics, pool boiling and condensing heat transfer and industrial heat exchangers. Researches on heat transfer characteristics included the results for thermal contact resistance measurement of metal interface, a fan coil with an oval-type heat exchanger, fouling characteristics of plate heat exchangers, effect of rib pitch in a two wall divergent channel, semi-empirical analysis in vertical mesoscale tubes, an integrated drying machine, microscale surface wrinkles, brazed plate heat exchangers, numerical analysis in printed circuit heat exchanger. In the area of pool boiling and condensing, non-uniform air flow, PCM applied thermal storage wall system, a new wavy cylindrical shape capsule, and HFC32/HFC152a mixtures on enhanced tubes, were actively studied. In the area of industrial heat exchangers, researches on solar water storage tank, effective design on the inserting part of refrigerator door gasket, impact of different boundary conditions in generating g-function, various construction of SCW type ground heat exchanger and a heat pump for closed cooling water heat recovery were performed. (3) In the field of refrigeration, various studies were carried out in the categories of refrigeration cycle, alternative refrigeration and modelling and controls including energy recoveries from industrial boilers and vehicles, improvement of dehumidification systems, novel defrost systems, fault diagnosis and optimum controls for heat pump systems. It is particularly notable that a substantial number of studies were dedicated for the development of air-conditioning and power recovery systems for electric vehicles in this year. (4) In building mechanical system research fields, seventeen studies were reported for achieving effective design of the mechanical systems, and also for maximizing the energy efficiency of buildings. The topics of the studies included energy performance, HVAC system, ventilation, and renewable energies, piping in the buildings. Proposed designs, performance performance tests using numerical methods and experiments provide useful information and key data which can improve the energy efficiency of the buildings. (5) The field of architectural environment was mostly focused on indoor environment and building energy. The main researches of indoor environment were related to the evaluation of work noise in tunnel construction and the simulation and development of a light-shelf system. The subjects of building energy were worked on the energy saving of office building applied with window blind and phase change material(PCM), a method of existing building energy simulation using energy audit data, the estimation of thermal consumption unit of apartment building and its case studies, dynamic window performance, a writing method of energy consumption report and energy estimation of apartment building using district heating system. The remained studies were related to the improvement of architectural engineering education system for plant engineering industry, estimating cooling and heating degree days for variable base temperature, a prediction method of underground temperature, the comfort control algorithm of car air conditioner, the smoke control performance evaluation of high-rise building, evaluation of thermal energy systems of bio safety laboratory and a development of measuring device of solar heat gain coefficient of fenestration system.