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강승민(Seoungmin Kang),박준홍(Joonhong Park),신진웅(Jinung Shin),이세동(Sedong Lee),양은수(Eunsoo Yang),하종훈(Jonghun Ha),손영부(Youngboo Son),이병철(Byengchul Lee) 대한설비공학회 2015 대한설비공학회 학술발표대회논문집 Vol.2015 No.11
In order to meet the various operating loads of an air-conditioning system, an inverter compressor with a wide operational range is necessary. One of the ways to achieve a wide operation range is to drive a small capacity compressor at high speed. Moreover, it is possible to maximize the efficiency in part-load operation condition close to actual operating conditions and to reduce the cost by compact design of a small capacity compressor. In addition, the shortage of maximum capacity, due to the small rated capacity, is covered through high speed operation. However, in general, if the compressor operates at high speed, problems occurs such as reduced efficiency due to friction, increased noise, increased amount of oil discharge and decreased durability of the main components. In order to solve these problems the following have been investigated: optimized dimension parameters of the compression chamber, enhanced shaft design and the structure for the reduction of oil discharge and noise at high speed operation. Finally the high speed inverter rotary compressor with high efficiency and more compact size has been developed as compared with the conventional rotary compressor
Numerical analysis on the aerodynamics of HAWTs using nonlinear vortex strength correction
Hogeon Kim,Seoungmin Lee,이수갑 한국물리학회 2010 Current Applied Physics Vol.10 No.2
Nonlinear vortex strength correction method (NVCM) based on potential flow, is developed for improvement of vortex lattice method which has difficulties to predict the separated flow conditions and the viscous effect. In this method, the bound vortex strength is determined by matching the lift force from VLM with the lift force from aerodynamic coefficients table as the same value of circulation is added to or subtracted from all chord wise vortices. For considering the nonlinearities due to the neighboring sections of the blade, sophisticated Newton–Rapson algorithm is applied. The validation of this method was done by comparing the simulations with the measurements on the NREL Phase-VI horizontal axis wind turbine (HWAT) in the NASA Ames wind tunnel under uniform and yawed flow conditions. This method gives good agreements with experiments in most cases.
백영순(Baek, Youngsoon),이정환(Lee, Jeonghwan),최양미(Choi, Yangmi),박승민(Park, Seoungmin) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
Considering the fact that more than 97% of fossil energy resources such as oil and natural gas needed in Korea rely on import, primary concern of the national economy is to secure future energy sources. Gas hydrates. which is non-conventional types of natural gas, distribute worldwide, especially in marine and permafrost Gas hydrates draw great attention recently as a new clean energy resources substituting conventional oil gas due to its presumed huge amount of volume reaching 10 trillion tons of gas and environmentally friendly characteristics. Results of preliminary survey by Korea Gas Corporation (KOGAS) and Korea Institute of Geoscience and Mineral Resources (KIGAM) showed that gas hydrates can be present in deep sea over 1,000m water depth in the East Sea. Gas hydrates can contribute to the rapidly increasing consumption of natural gas in Korea and achieve the self-support target by 2010 with 30% of total natural gas demand. This study presents the potentialities and development prospects of gas hydrate as a future energy source.