Abstract
The purpose of this study is to develop the compact auxiliary heater using tubular flame for home CHP (combined heat and power). The tubular flame is formed in a rotating flow field by injecting the air-fuel mixture tangentially into the cylindrical chamber. Combustion gas of the tubular flame has a high heat transfer coefficient due to the swirl flow. The coiled tube and the inserted tube installed at the center of the coiled tube are used as a heat exchanger. Combustion gas flows through the gap between in coiled tube and inserted tube. The thermal efficiency is 87% based on LHV. In this study, the heat transfer characteristics of the coiled tube is reported.
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