| 摘要 |
<p>1488569 Cooling tower BALCKE-DURR AG 22 May 1975 [2 Nov 1974] 22314/75 Headings F4K and F4S In a tower for air cooling of hot water, there are (a) wet heat transfer elements 3 where the water is sprayed on to surfaces, trickles thereover and is cooled by partly evaporating into air streams 2 and (b) tubular heat transfer elements 4 which can be operated selectively (i) wet as at (a), and/or (ii) dry with the hot water passing through the tubular elements 4 which are externally cooled by the air streams 2. As shown, water to be cooled is supplied through a pipe-line 5. Some is cooled in elements 4 and some on elements 3. The cooled water is collected in a tank 7 and removed through a duct 8. Whether the elements 4 operate wet or dry is regulated by units 6. The tubular hollow elements 4 may be formed of plastics material. The elements 3 may be trickle plates. Fig. 3 shows an arrangement where water to be cooled is supplied at 10 to an element 4 and flows through cavities therein for indirect air-cooling. Thereafter the water can be arranged to pass through stepped sprays of a spraying system 9. Some or all the sprays spray the water on to the element. Evaporative cooling occurs as the water trickles over the element. The tubular hollow elements 4, Fig. 4 (not shown) may be connected such that the water flows therethrough in series. A heat exchange element 4 may comprise panels of tubes in communication with water chambers 12, Fig. 5. Air flows upwards in spaces between the panels of tubes. The spaces are defined by spacers 13 and 14. The tower can be operated fume-free by altering the ratio of wet to dry exchange surfaces.</p> |
