| 摘要 |
<p>A heat exchange apparatus (10) is provided with an indirect evaporative heat exchange section (50) and a direct evaporative heat exchange section (90). A uniform temperature evaporative liquid is downwardly sprayed into the indirect section to indirectly exchange sensible heat with a hot fluid stream flowing within a series of enclosed circuits (54) which comprise the indirect evaporative heat exchange section. After the evaporative fluid descends through the entire indirect heat exchange section and absorbs heat, it is distributed across fill media within the direct evaporative heat exchange section for cooling. Separate streams of ambient cooling air are simultaneously drawn into each of the heat exchange sections to evaporatively cool the evaporative liquid flowing within each section. The water cooled in the direct heat exchange section is then collected in a sump (30) where it is allowed to mix and resultantly become uniform in temperature before being redistributed. The initial uniform temperature of the cooling water is operationally the most controlling factor in maximizing the uniformity and performance of the indirect heat exchange section and the tower as a whole. The indirect heat exchange section is constructed from a series of spaced circuits having a continuous serpentines shape where the internal fluid to be cooled flows upwardly at a uniform rate and temperature from circuit to circuit. As the water descends, it indirectly exchanges sensible heat with the fluid uniformly from circuit to circuit along the vertical and horizontal heights of the indirect heat exchange section. An additional gain in the uniformity of circuit to circuit performance and heat exchanged is realized when the cooling air stream passing through the indirect heat exchange section is parallel or concurrent with the cooling water flow. The apparatus can be used as a fluid cooler, an evaporative condenser, or as a wet-air cooler. <IMAGE></p> |
