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실험계획법에 의한 핀 튜브 타입의 흡착식 냉동기 최적화 조건 연구
안상혁(Ahn Sang Hyeok),홍상우(Hong Sang Woo),권오경(Oh Kyung Kwon),정재동(Jae Dong Chung) 대한설비공학회 2013 대한설비공학회 학술발표대회논문집 Vol.2013 No.11
This study is to systematically analyze the effect of various kinds of parameters on the performance of a fin-tube type adsorption chiller. Orthogonal array L27(313) of nine parameters with three levels, is adopted for the analysis of variance. The result gives quantitative estimation of the various parameters affecting the performance and helps to determine the main factors for the optimum design of a fin-tube type adsorption chiller. In the range of parameters considered, the fin height is found to be the most dominant parameter for the case of object function of COP, and the temperature of hot water is expected to be the most dominant parameter for the case of object function of SCP.
핀-튜브형 흡착탑 해석시 입자간 물질전달 모델의 타당성 검증
안상혁(Sang Hyeok Ahn),홍상우(Sang Woo Hong),권오경(Oh Kyung Kwon),정재동(Jae Dong Chung) 대한설비공학회 2013 설비공학 논문집 Vol.25 No.12
This study presents a numerical investigation of the heat and mass transfer kinetics of a fin-tube-type adsorption bed using a two-dimensional numerical model with silica-gel and water as the adsorbent and refrigerant pair. The performance is strongly affected by the heat and mass transfer in the adsorption bed, but the details of the mass transfer kinetics remain unclear. The validity of inter-particle models used to simulate mass-transfer kinetics were examined, such as a constant pressure model and non-constant pressure model, and the valid ranges of the diffusion ratio for each model are proposed. The COP and SCP have been numerically calculated as the performance indexes according to the diffusion ratio. The constant pressure model, which is commonly used in previous research, was found to be valid only in a limited range of diffusion ratio.
안상혁(Sang Hyeok Ahn),임성환(Sung Hwan Yim),박준우(Jun Woo Park),라영은(Young Eun Ra) Korean Society for Precision Engineering 2020 한국정밀공학회지 Vol.37 No.2
In this study, pyrolytic graphite was applied to overcome the conventional cooling system. Pyrolytic graphite is an anisotropic material with high thermal conductivity in the X-Y direction and low thermal conductivity in the Z direction. The advantage of high thermal conductivity in the plane direction is applied to improve the performance of the cooling capacity transceiver module housing made of aluminum. In comparison with the housing using the aluminum, the housing applied to the PGS plate shows a higher cooling performance on the average temperature of chips and the temperature variations by 2.79% and 49.98%. The heat dissipation performance was investigated according to the thickness of the PGS and the via the shape. When the factor of thickness in PGS plate was “0.375”, the average temperature of the chip was the lowest, and the temperature variation decreased due to increasing the factor of thickness in the PGS plate. In the case of the via shape, the “separation plate” showed the lowest average temperature of chips and the “plate” showed the lowest temperature variation.