What are the factors that affect the cooling efficiency of cooling towers?
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Everyone is welcome to discuss this. In our company, the hot water from the multi-effect heater is sent to a cooling tower for temperature reduction, but the cooling effect isn’t very good, and there are issues with the water flow rate.
The last edit to this post was made by zdl1966 on 2016-8-24 at 16:42. 1. Surface area of contact between the cooling medium and the substance being cooled: Cooling towers use high-efficiency, low-pressure atomization devices to spray water into tiny droplets measuring 0.5–1 mm in size at low pressures. This results in a specific surface area that is 5% larger than that obtained when water is dispersed into a film form by packing materials, allowing for continuous and rapid renewal of the surface area for heat and mass transfer, as well as quick removal of the latent heat from the atomized stream. 2. Ratio of cold air volume to cooling water volume: With the elimination of the packing in the cooling tower, the system resistance of the tower – that is, the total pressure required by the fan – is reduced to 50% of that in a tower with packing. As a result, the tower resistance decreases, and the air volume handled by the axial flow fan increases to 120% of that in a tower with packing. With the same amount of cooling water, the air-to-water ratio increases by 20%. 3. Cooling time: The cooling tower uses an upward spraying system; the atomization devices are strategically installed above the air inlet ducts, allowing the water droplets to undergo both downstream and upstream flow processes within the tower. Some of the droplets remain in a suspended state at the upper part of the spraying section inside the tower, thereby **increasing the residence time of the water within the tower** and ensuring sufficient time for heat exchange between the cold air and the water. The above pertains to the design aspects of the cooling tower; as for operation, possible issues include: 1. Collapse of the packing. 2. Packing blockage. 3. Distribution pipe failure. 4. Insufficient fan component. 5. Excessively high temperature.
When designing cooling towers, we take into account design margins as well as backup units； Generally, it operates with two in use and one as backup, but it can also operate with one in use and one as backup ； In cold weather in the north, sometimes one fan is turned on; when temperatures are extremely high in summer, all three fans may be used, and the performance is quite satisfactory.
Did you install three fans on top?
The flow rate is 1300 M3/h, using three fans
Are the fans located on the third floor at the top of the cooling tower?
How is it arranged? Could you send a picture? Thank you very much
Cooling tower technical manual: http://bbs.hcbbs.com/thread-1605556-1-1.html (Source: Haichuan Chemical Industry Forum) Summary of knowledge on absorption towers: http://bbs.hcbbs.com/thread-1605558-1-1.html (Source: Haichuan Chemical Industry Forum)