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이현우,이승복,Lee, H.W.,Leigh, S.B. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.4
As the cooling energy requirement in an office building increases due to the increased internal heat gains, the effort to minimize the energy consumption through efficient operation of existing HVAC systems will be beneficial. In this study, one of the energy conserving efforts in an office building, operational strategies of Economizer Cycle Control have been investigated through DOE-2.1E computer simulation. The findings can be summarized : 1) Economizer Cycle Control saves energy throughout the year, 2) Econo-Limit-T must be applied seasonally based on the outside and return air conditions, 3) use of Enthalpy control is more energy efficient than that of Temperature control.
응력이완시험을 이용한 ti-6Al-4V 합금의 초소성 특성연구
이승복,장영원,이종수,김지식 대한금속재료학회(대한금속학회) 1995 대한금속·재료학회지 Vol.33 No.8
A study has been made to investigate the superplastic deformation behavior of Ti-6Al-4V alloy based on the theory of inelastic deformation which consists of two mechanisms; the grain matrix deformation and the grain boundary sliding. Load relaxation tests were performed in the temperature ranges from 600℃ to 927℃ to obtain stress-strain rate curves for the samples having 2.5㎛-16㎛ grain sizes. Superplastic deformation tests were also carried out to verify the superplastic deformation behavior. The results showed that grain matrix deformation was dominant at 600℃ and grain boundary sliding became dominant above the temperature of 800℃. The grain matrix deformation behavior was far apart from the power law creep, but found to be rather consistent with the state equation based on the dislocation dynamics. Because of rapid grain coarsening which led to early cavity formation, the tensile elongation became smaller at 900℃ rather than at 800℃.