4/29/2021 0 Comments Open And Closed Loop Cooling Tower
Optimal combination of excellent heat exchange coil and heat transfer layer along with broad air inlet, to reduce the temperature of circulating water efficiently and improve the thermal efficient significantly.Unique coil design with certain inclined angle to drained water completely from cooler to avoid coil damage when no use in winter.A notable advantage to this type of system is protection from external contaminants.
This month well talk about Cooling Towers, how they work, and how they are used to facilitate this cooling. Cooling towers may rely on fans and spray pumps to cause the evaporation of water or, as in the case of a natural draft circuit, only the movement of air to remove process heat. Cooling towers vary in size from small rooftop units to huge towers over 600 tall. This water is typically maintained at 85f for use with general process machines. The phrase Open Circuit means that the water going through the tower is ultimately going back to an open tank. Quite simply, water cooled by the fans is directed out toward the manufacturing process needing cooling, later returning to the cooling tower as HOT water. Excess heat escapes the tower; the water is further cooled via evaporation and the action of the fans, then directed back to the process needing cooling, completing the circuit. This type of system does not get air-bound due to it being an open circuit. This type of cooling tower is typically used by manufacturers for cooling oil or air compressors, process furnaces, or any machine generating excess heat. This system relies on natural draft or the chimney effect, meaning that the movement of air into and out of the cooling tower results from air buoyancy. Buoyancy occurs due to a difference in indoor-to-outdoor air density resulting from temperature and moisture differences. Hot air produced by the manufacturing process will naturally gravitate up through the tower, leaving cool water behind. These natural draft towers are much bigger in size than the induced draft towers and have the ability to cool large volumes of water. This type of cooling tower is used by electrical energy producers and is commonly found at power plants. Construction of this type of tower is a huge investment, but reduced maintenance costs and low thermal energy waste make it an appealing option. The water being cooled is pumped through the circuit and diverted to the heat exchanger as needed. Baffles on top of the tower open to release this heat; exhaust fans may also help reject heat. At this point, if additional cooling is needed, the spray pump will shower water over the heat exchanger coils. Once the desired set point is reached, the cooling fluid is returned to the process circuit. This type of tower is also referred to as a Closed Circuit Cooler. These are generally used for cooling multiple water cooled HVAC systems and or multiple he at pumps in a manufacturing setting.
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