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공동주택 바닥난방시스템의 최적구조 : 컴퓨터시뮬레이션에 의한 축열 및 방열특성 분석을 중심으로
조동우 대한건축학회 1999 대한건축학회논문집 Vol.15 No.5
The purpose of this study is to propose the design data for optimal installation by analyzing thermal characteristics and problems of the existing system in apartment houses The computer simulation is carried out to analyze the thermal characteristics according to combination of all the components to optimize the overall performance of a floor heating system. The covering screed of a floor heating structure is directly related to the heat flow density and the uniformity of floor surface temperature. It is recommended that the thickness of covering screed is around 30mm to provide an even floor temperature For comfortable indoor thermal environment. The increasing rate of beat output and the deviation of a floor surface temperature are reduced m case that the thickness of thermal storage layer is over 10mm. Thus, it is found that the thermal storage layer has thermally the effective structure in the case of the thickness of around 10mm. Since the main heat output of the system should be in upward direction, the thickness of the thermal insulation is recommended to be around 30mm in order to reduce the downward heat output in the typical floor The thermal insulation layer in the ground floor should be over 90mm thick enough to prevent the downward heat loss through the ground concrete slab.
조동우 대한건축학회 1995 建築 Vol.39 No.6
이 글에서는 이러한 시점에 선진국에서 최근 강화되고 있는 건축물의 에너지절약기준 동향을 살펴보고 우리나라 기준의 현황과 앞으로의 개선방향에 대해 검토해 보고자 한다.
조동우,김원식,장헌성,정태성,박종기,박종호 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.11
Adsorption and desorption dynamics of CF4 on an activated carbon bed were studied experimentally and theoretically, focusing on pressure-changing steps. The theoretical model used the ideal adsorbed solution (IAS) theory and the linear driving force (LDF) approximation as equilibrium and mass transfer models, respectively. Adsorption breakthrough curves of raw CF4 gas (500, 1,000, and 1,500 ppm) were well predicted by the theoretical model and the diffusion time constant for CF4 was found to be 3.3×10−3 s−1 from breakthrough curve fitting. Changes in the CF4 concentration during depressurization could be easily predicted using the above mathematical model when the half-cycle time (θc) was above 0.1. However, significant discrepancies were observed between the predicted CF4 concentrations and the experimental data when θc was 0.1. Nakao and Suzuki also reported that proportional constant of LDF approximation (=KDe/Rp 2) needs to be modified when θc is less than 0.1.