The generic term "cooling tower" is used to describe direct (open) and indirect (closed-circuit) cooling equipment.
While most come up with a "cooling tower as an open direct contact heat dissipation device", the indirect cooling tower, sometimes referred to as the "closed circuit cooling tower", is but also a cooling tower. A direct, or open-circuit cooling tower is a means of sealing the interior of the structure by spraying the circulating water in a spray way onto the filler of the fiberglass. Fillers provide a larger contact surface, through water and air contact, to achieve heat transfer effect. Another fan drives the airflow cycle in the tower, bringing out the hot air flow after heat transfer to the water, thus achieving cooling.
Filling may consist of multiple, mainly vertical, wet surfaces that transmit water (padding) or transverse splash elements that create many layers with large surface area droplets cascade several levels of thin films (splashes). Indirect or closed-circuit cooling towers do not involve direct contact with air and liquids, usually water or ethylene glycol mixtures that are cooled. The difference is that the open cooling tower, the cooling tower indirectly has two independent fluid circuits. One is that the water in the external circuit is in the second track, which is the connection of the Tube-regulating outer circulation (non-public coil) to the thermal fluid process that is cooled and returned in closed circuit. Air is drawn by circulating over the entire heat pipe outside the cascading water, providing a similar evaporation cooling cooling tower open. The heat flow in operation from the internal fluid circuit, through the coil tube wall, the external circuit, is then heated by some evaporation of air and water into the atmosphere. The action of the indirect cooling tower, so very similar, opens the cooling tower with one exception.
This process is cooled by coolant in a "closed" loop and does not directly expose circulating water in the atmosphere or outside. When the air in the countercurrent cooling tower moves upward through the filling or bundle, the opposite water moves downward. When the air level of the transverse flow cooling tower moves through the fill, the water moves downward.
