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김동락(Dong-Rak Kim),김현(Hyun Kim),이치노세토시히코(Toshihiko Ichinose) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.7
The voltages of unit cells of a fuel cell stack are one of the most significant factors to detect failure conditions and thereof safely control and operate the fuel cell system. In this paper, we describe two methods to monitor the voltages of the unit cells of a stack in consideration of data accuracy, circuit extensibility to various numbers of cells, and cost. The reported methods are approached by (Ⅰ) the power isolation of cell voltage monitoring part from the communications part and (Ⅱ) the utilization of a commercially available cell monitoring integrated circuit IC of a Li-ion battery.
김동락(D.L. Kim),양형석(H.S. Yang),이병섭(B.S. Lee),최연석(Y.S. Choi) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
We presented the thermal design results of a protomodel of space infrared cryogenic system (PSICS) at 2005 KSME spring conference. From the design results, we knew that the radiation heat load accounts for major part of the heat loads. In order to verify the design results, we measured the radiation heat load by using boil-off calorimetry method with liquid nitrogen. The experimental result is in good agreement with the calculation one. The experimental set-up and radiation heat load measurement result of PSICS will be presented.