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윤희중(Hee Joung Yun),장기현(Gi Hyun Jang),전세균(Se Kyun Chun),이창언(Chang Eon Lee),서태범(Tae Beom Seo),정영식(Young Sik Jeong) 한국연소학회 2008 KOSCOSYMPOSIUM논문집 Vol.- No.-
This paper describes the design study of heat exchanges for high efficient condensing gas boiler. In this study, the preliminary specifications of two kind heat exchangers, one is cylindrical type and the other is square type, are described. The heat transfer and flow characteristics on each heat exchangers are studied by numerical methods and performance of the pilot gas boilers are investigated by experimental method. As a results, the pilot boiler efficiency reach to about 85%, but the NOx and CO emission levels are very high than the target levels. Supplementary investigations will be carried out to decrease the emission level of NOx and CO.