| 摘要 |
<p>The additional air heating system is for a central heating system with boiler, feed and return pipes, and flue. A combustion-gas-to-circulating-air heat-exchanger (4) is mounted in the flue of the boiler (1), and connected by air ducts (5) to the inlet and outlet (7,8) in a room (6) to be heated, and a fan (9) is mounted in this conduit. Between the boiler and this heat-exchanger there can be one between the combustion gas and mixed air (10), a mixed-air passage (11) to this branching off from the air ducting. This passage discharges into the flue (3) behind the first exchanger (4), delivering heated air into the gases via an injector (12).</p> |
