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Numerical Analysis of Combustion and Heat Transfer of Domestic Gas Boiler Equipped with 2-stage Heat Exchanger  

Kang, Seung-Kyu (Institute of Gas Safety R&D, Korea Gas Safety Corporation)
Choi, Kyoung-Suhk (Institute of Gas Safety R&D, Korea Gas Safety Corporation)
Kwon, Jeong-Rack (Institute of Gas Safety R&D, Korea Gas Safety Corporation)
Publication Information
Journal of the Korean Institute of Gas / v.14, no.5, 2010 , pp. 1-6 More about this Journal
Abstract
In this work, a numerical investigation is performed for the combustion chamber of domestic gas boiler with 1-stage and 2-stage heat exchangers. The fluid flow and heat transfer performance is simulated with a structure change of heat exchanger. The numerical solution shows that the heat transfer of the 2-stage heat exchanger is about 24% higher than that of the 1-stage heat exchanger, while the pressure loss of the 2-stage heat exchanger increases. The temperature of combustion chamber with 2-stage heat exchanger is lower than that of 1-stage. This effect reduces thermal NOx with decrease of high temperature staying time of the combustion gas.
Keywords
Domestic Gas Boiler; 2-stage Heat Exchanger; Simulation of Flow and Heat Transfer;
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