Abstract
A new heat exchanger with branch structure generated easily high temperature air. This exchanger consists of rings with a diameter of about 30mm and a height of 100mm. Rings were also connected with straight tubes to the rings. The heat exchanger was set in an electric furnace and water bath adjusted to 100℃ or 600℃. Air was supplied to the top ring, and was drained from the bottom ring, repeating collosions at branch points. Air of 80℃ or above was generated, when the heat exchanger was installed in a water bath of about 100℃. High tempreture air of 500℃ or above was generated, when the furnace temperature was 600℃. Heat exchange was observed only for a short time in the spiral type exchanger without branch points. The outlet air temperature increased with the number of branch points, suggesting that the air collision at branch points stimulates the heat exchange.
