| 摘要 |
The apparatus is provided with two condensers which are enclosed by a third condenser. The apparatus is connected to the flue gas outlet and combustion air inlet of a central-heating apparatus fitted with a fan. The flue gases flow past the two condensers. The first condenser is connected to the return water of the central-heating installation and to the feed water line of the second condenser. The second condenser is connected to the water mains. The flue gases flow past and around the first two condensers and pass along the inner walls of the third condenser. The third condenser has the combustion air flowing through it. The first condenser has feed water flowing through it, surrounded by central-heating water. The two circuits are entirely separated from one another. The feed water cools the central-heating water which is cooled by the feed water. The feed water then cools the flue gases to less than 90 degree C. At low temperatures of the supplied central-heating water, condensation may occur as early as after the first condenser. The second condenser has feed water flowing through it which then flows through the first condenser. The feed water cools the flue gases further to less than 25 degree C and is warmed in both condensers. The feed water outlet is connected to a feed tank or boiler of the central-heating installation to be further heated there to the desired feed water temperature. In the third condenser, the combustion air is heated, and the walls cool the flue gases. |
