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These days, household condensing gas boilers are an obligatory trend. The use of environmentally-friendlyboilers that emit less pollutant, such as CO and NOx, are strongly recommended. In this paper, heat flow analysisof the additional inner groove in the tube of the secondary latent heat exchanger was studied to increase the efficiency. A 20% difference in the heat transfer area was obtained with the addition of an inner grove, which showedan increase in the amount of heat transferred. This was confirmed using three-dimensional numerical analysis. Withthe addition of an inner groove, the exit temperature increased by 1 ℃ . This increase in exit temperature was considered to be a substantial increase in the efficiency of the condensing gas boiler. Key Words : Condensing Gas Boiler, Latent Heat Exchanger, Inner Groove, Gas Boiler Efficiency, Heat Flow    2013      . * Corresponding Author : Sang-Heup Park(Kongju National Univ.)Tel: +82-10-8380-2400 email: weldpark@kongju.ac.krReceived March 31, 2013 Revised (1st April 29, 2014, 2nd May 9, 2014, 3rd May 16, 2014, 4th May 26, 2014) Accepted July 10, 2014

Heat Flow Analysis of Inner Groove Tube for Latent Heat Exchanger in Condensing Gas Boiler