| 摘要 |
<p>One or more outflow ducts for water are vertically aligned in a wall providing services in esp. prefabricated buildings. The duct (2a) is housed in heat-insulating material. On its inside it has a succession of deflecting protrusions (3,4), horizontally aligned over part of their length. Each pair of protrusions is mutually offset on the duct's length, being sited on opposite inner walling sides. The top end of the duct may open out into a heat-exchanger. Its walling (1a) can be made of foamed ceramic material. Flow of water carried away is decelerated, and heat from such water is attracted.</p> |
