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대공간 공조에 있어서 천정 디퓨저 각도변화에 따른 속도분포에 관한 연구
문훈영,문기주,정종안 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.5
Large enclosure means a structure of high ceiling and large floor. In designing the heating system, many thermal conditions are considered, such as thermal comfort, IAQ(Interior Air Quality), heating load and energy efficiency etc. In this study, we propose a comfortable indoor climate conditions through proper air distribution analysis formed in residential areas according to various angles of the diffuser. The simulation conditions are 7 m high diffuser, 4/2 inlet/outlet diffusers, 39°C discharge air temperature, and 6 m/s exit velocity. The results show that 45° diffuser provides an optimal thermal environment, and the reason is that the velocity reaches the desired velocity below 0.3m/s at 1.18m elevation plane. As the diffuser angle is decreased, the asymmetry of the velocity distribution is increased due to the thermal buoyancy effect.
대공간 건축물의 천정 취출구 각도변화에 따른 온도분포에 관한 연구
문기주,정종안,문훈영 한국기계기술학회 2014 한국기계기술학회지 Vol.16 No.4
Large enclosure means a space of high ceiling and large floor. Designing the heating system, many thermal conditions exist, such as thermal comfort, IAQ, heating load and energy efficiency etc. The prediction of the temperature distribution is carried out according to some of the diffuser angle. The simulation conditions are 7 m high diffuser, 4/2 inlet/outlet diffusers, 39 °C discharge air temperature, and 6 m/s exit velocity. The results show that 45° diffuser provides an optimal thermal environment, and the reason is that the temperature is closed to the designed temperature 22 °C at 1.18m elevation plane. As the diffuser angle is decreased, the temperature of the upper region is increased for the thermal buoyancy effect. And the asymmetry of the temperature distribution is increased.
박창권(C.G.Park),오병수(B.S.Oh),문훈영(H.Y.Moon) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
The purpose of the paper is to analyze heat transfer within a running tire and to evaluate temperature variation. Geometry of the tire as well as the governing equation in physical domain is transformed into those in computational domain by boundary-fitted coordinates. An<br/> unsteady three-dimensional heat conduction equation is solved with heat convecton and radiation boundary conditions. The governing equation includes the conduction. convection and radiation terms. In this paper. we compared the numerical solutions with the experimental results. We know that the highest temperature region is the shoulder of tire. The result of this analysis coincides with the experimental one.<br/>