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액체 이산화탄소 이용한 Monasil PCA 추출에 대한 연구
조동우 ( Dong Woo Cho ),오경실 ( Kyoung Shil Oh ),배원 ( Won Bae ),김화용 ( Hwa Young Kim ),이갑수 ( Kab Soo Lee ) 한국화학공학회 2012 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.50 No.4
Poly(acrylic acid) (PAA) microspheres is one of the widely-used polymeric materials for the bio-field application and the electric materials. For the synthesis of PAA microspheres, the polymerization technique using surfactants is applied. After the synthesis, the purification and separation processes are required for the removal of surfactant. When general organic solvents were used, many problems, such as huge amount of waste solvent, additional separation processes, and the possibility of residual media, were occurred. Thus, High-pressure Soxhlet extraction using liquid CO2 was developed to solve these problems. In this study, High-pressure Soxhlet extraction of the synthesized PAA microspheres using liquid CO2 was conducted for the removal of Monasil PCA which is used for the dispersion polymerization of acrylic acid in compressed liquid Dimethyl ether (DME). The morphology of the extracted PAA particles was checked by field emission scanning electron microscopy (FE-SEM) and the residual concentration of Monasil PCA was analyzed by inductively coupled plasma - Optical Emission Spectrometer (ICP-OES). For studying the effect of the solvent effect, Soxhlet extraction was conducted using n-hexane, liquid DME, and liquid CO2. In case of n-hexane, some extracted PAA microspheres were produced. However, deformation was also occurred due to the high thermal energy of n-hexane vapor. Liquid DME could not remove Monasil PCA. When using liquid CO2, the extracted PAA microspheres which were free for the residual solvent were produced without deformation. For finding the optimum operating condition, high-pressure Soxhlet extraction was conducted for 8 hours with changing the temperature of reboiler and condenser. When the extractor temperature is 19.6±0.2 oC and the pressure is 51.5±0.5 bar, the best removal efficiency was obtained.
조동우(Cho Dong-Woo),유기형(Yu Ki-Hyung),유정연(Yu Jung-Yeon) 대한건축학회 2007 대한건축학회논문집 Vol.23 No.11
In Korea, all residential buildings adopt floor-heating systems for indoor thermal comfort. And the ratio of multi-family houses exceeds 50%. Lately problems of noise between floors and contamination of indoor air in multi-family houses emerged as social issue, and performance standards related to noise between floors and ventilation were established in Housing Regulation. Concerning these issues, many systems have been developed. Recently developed raised floor heating system is not only capable of basic function to reduce noise between floors, but also is a multi-functional floor heating system enabling natural ventilation. The procedure of this system for natural ventilation is to import outdoor air through bottom space of the floor heating system, circulate indoor space and discharge it out of ceiling. In winter, powerless natural ventilation is possible with buoyancy effect caused by temperature difference between outdoor and indoor. And it also allows saving of energy by importing pre-heated air in bottom space of the floor heating system. To evaluate ventilation performance of this system, on-site measurement was conducted in 2 test laboratories, and the nominal air change rate was satisfied as 0.4~0.8 h<SUP>-1</SUP> under the condition of outdoor temperature 5℃~-5℃, which was evaluated as highly possible to be applied as a natural ventilation system in multi-family houses. So, this system as hybrid ventilation system using natural ventilation is evaluated as highly possible for application. It also allows saving of energy by importing pre-heated air in bottom space of the floor heating system. Moreover, it was proven that air temperature at supply grille was maintained higher than indoor temperature, by which it was proven to enable blocking of cold draft problem.
조동우(Cho, Dong-Woo),신성은(Shin, Sung-Eun),유정연(Yu, ung-Yeon),윤용상(Yoon, Yong-Sang),김수암(Kim, Soo-Am) 대한건축학회 2013 대한건축학회논문집 Vol.29 No.12
In energy-saving buildings, unlike the construction technologies of conventional buildings, elemental technologies for implementing building sustainability and green buildings are applied in complex and diverse ways allowing the management elements of construction projects to gradually increase. Further, more efficient project implementation separate from the traditional methods is required to implement the energy-saving buildings due to the high level technology required and the decision-making processes of effective technology application in terms of cost, are also necessary. In this study, we intend to establish an integrated design method and process for high-rise zero-carbon green homes of South Korea and present the analysis results of the construction details and energy performance derived from the effective project implementation. As a result, the final energy performance simulation implemented using the technologies, materials, and details selected by the proposed integrated design method confirmed, in the areas of heating, cooling and lighting as the primary goal of this study, 87% reduction of heating and more than 50% reduction of power, verifying the proposed integrated design process and passive details can be a solution that is applicable to high-rise apartment buildings.