| 摘要 |
<p>The invention relates to a power source for supplying water-based liquid to a system (1, 2) through a pipe system (4) which is filled with antifreeze so that the pipe system has a stand-by pressure, wherein a container (5) for the water-based liquid, an additional container (9) which is filled with antifreeze and means (6) for feeding the water-based liquid from the container (5) into the pipe system in liquid phase if the pressure in the pipe system drops below the stand-by pressure by a first pressure value giving momentarily rise to a first pressure level in the pipe system, are associated with the pipe system. To enable economical and automatic supply of water-based liquid to a system without the risk of the liquid freezing, the means for feeding water-based liquid comprises as part of the power source a pump unit (6) comprising a pump (7) and a power source (8) and that the power source comprises an additional pump unit (10) comprising a pump (11) and a power source (12), the additional pump unit being arranged to maintain the stand-by pressure and to supply for this purpose antifreeze from the additional container (9) to the pipe system (4) if the pressure in the pipe system drops below the stand-by pressure by a second pressure value giving momentarily rise to a second pressure level in the pipe system, the second pressure level being bigger than the first pressure level.</p> |
