| 摘要 |
<p>Procedure for drawing thermal energy from freezing liquid, e.g. from lake or sea water, by evaporating said liquid in a crystallizer (10) where prevails the pressure of the triple point, whereby part of the liquid is converted into vapour and part of it freezes to crystals. The vapour is condensed in the evaporator (13) of a heat pump (15) in heat exchange with the heat transfer fluid, e.g. Freon, of the heat pump after the pressure and temperature of said vapour have been increased to be above the freezing point, this being done by pumping it to said higher pressure with a vapour jet ejector (12) in which as operating vapour serves vapour that has been generated in a supercooler (14) provided for the heat transfer fluid of the heat pump and which is high-pressure vapour compared with the pressure of the triple point, and in this way the vapour can be made to condense to liquid and freezing over of the heat exchange surfaces of the heat pump's evaporator is avoided. The invention is also applicable in crystallizing and concentrating other substances, and in desalinating sea water.</p> |
