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김석준(S.J. Kim),김욱중(O.J. Kim),이정호(J.H. Lee),최항석(H.S. Choi),정경열(K.Y. Jeong),이성수(S.S. Lee),이종훈(J.H. Lee),김성민(S.M. Kim) 한국연소학회 2010 KOSCOSYMPOSIUM논문집 Vol.- No.40
Domestic gas boilers with high thermal efficiency and low concentration of CO and NOx in exhaust gas were developed in cooperation with several research institutes, universities, and companies. Integration and performance test results of the boiler systems will be presented in this paper, on the other hand development results of core parts like burners, heat exchangers and blowers in the boilers in others. The results showed both developed boilers with rectangular or cylindrical type of heat exchanger satisfied project objectives of thermal efficiency over 90% (SEDBUK, class A), NOx concentration of 50 ppm, and CO concentration of 40 ppm.
한승우(S. W. Han),최현주(H. J. Choi),김병일(B. I. Kim),김병민(B. M. Kim),김동호(D. H. Kim),김욱중(O. J. Kim) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
In general a thermoelectric cooler (TEC) consists of a series of P type and N type thermoelectric materials sandwiched between two wafers. When a DC current passes through these materials, three different effects take place; Peltier effect, Joule heating effect and heat transfer by conduction due to temperature difference between hot and cold plates. In this study we have developed a micro TEC using Bi2Te3 (N type) and Bi0.5Sb1.5Te3 (P type) thin films. In order to improve that performance of a micro TEC, we made 10 um height TE legs using special PR only for lift-off. We measured COP (coefficient of performance) and temperature difference between hot and cold connectors with current.