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장기태 國立金烏工科大學校附設生産技術硏究所 1991 産業技術開發硏究 Vol.7 No.-
Evaluation of the coefficient f is essential in designing reinforced earth structures. Thus, it is worthwhile to review the previous researches on the frictional behaviour between the soil and the reinforcement and to analyze the factors controlling the coefficient f. There are many factors influencing th frictional behaviour between the two. Such factors include ①the Soil density ②the overburden pressure ③the compaction ④the fine-grained portion ⑤the length ⑥and the width of the reinforcement ⑦the stiffness of the reinforcement ⑨the testing methods employed This paper aims to identify the predominating elements in these factors above considering the soil-reinforcement interaction. Consequently, relative strain and relative stiffness seem to be keywords in understanding the frictional mechanism of the soil-reinforcement.
냉매 저장방식에 의한 쾌속 냉각장치에 대한 실험적 연구
장기태,고준석,정상권 대한설비공학회 2003 설비공학 논문집 Vol.15 No.11
In the present study, low-temperature low-pressure refrigerant storage method is proposed to achieve higher cooling capacity during a short period of time than that of a compressor in steady operation. Experimental apparatus was designed and set up to analyze the performance of the new-conceptual cooling system. Two reservoirs for sequential storage of refrigerant were used in the cooling system. Several on/off solenoid valves were installed for control of refrigerant flow. From the experimental results, the initial rapid cooling by low temperature low-pressure refrigerant storage method was ascertained for successful operation. This rapid cooling methodology shall be useful for other low-capacity refrigeration system.
장기태,남관우,정상권 대한설비공학회 1998 설비공학 논문집 Vol.10 No.2
A multi-type heat pump controls the mass flow rate of the working fluid to cope with variable heat loads when it is under dynamic load condition. This paper describes the exergy analysis associated with the dynamic response of heat pump. First, a basic heat pump cycle is examined at steady state to show the general trends of exergy changes in each process of the cycle. Entropy generation issue in the exchangers is discussed to optimize the heat pump cycle. Second, the performance of the inverter-driven heat pump is compared to that of the conventional one when the heat load is variable. Third, the exergy destruction rate associated with the ON/OFF operations of the heat pump is calculated by simulating the thermodynamic states of the condenser and the evaporator. The inefficiency of the ON/OFF operation during the transient period is quantitatively revealed by the exergy analysis.