How does evaporation take place in a cooling tower?
Evaporate occurs in any time, it is the process by which water changes from a liquid to a gas or vapor. The cool down working principle of cooling tower is evaporating when working fluid contact with atmosphere. Though this you can know evaporation takes place any time in open loop cooling tower. In cooling tower there also has fan to help evaporate going on to shorten the cooling time. ( Know the working principle of cooling tower. )
How can I find out the evaporation loss in a cooling tower?
Evaporation is the major path to cool down the working fluid. Evaporation loss usually represents the efficiency of cooling tower and the heat of equipment. There is a formula to calculate evaporation loss volume:
Evaporation loss (m3 /hr)=0.0008 x 1.8 x Circulation rate (m3 /hr) x (T1-T2)
T1: Inlet water temperature
T2: Outlet water temperature
How evaporation losses affect the operating efficiency of cooling tower?
Cooling tower use water circuit to bring heat out, in this process, part of cooling water will be evaporated, this is called evaporation loss. Evaporation loss usually represents the efficiency of cooling tower and the heat of equipment. But when evaporate is going on that would cause water scale generated at the same time. The situation would cause heat exchanging efficiency of cooling tower decrease. By the way, it also would increase the make-up water. ( Know the relationship between water scale and operating efficiency of cooling tower. )
How to reduce evaporation losses in cooling tower?
At this time, you may have a question “Evaporation loss usually represents the efficiency of cooling tower and the heat of equipment. But, how can we reduce the loss volume of evaporation?” Common solution is to reduce the volume of airflow it also can help reducing cooling tower power consumption. Through decrease the rotating speed of fan and the using of variable frequency motor to reduce the volume of airflow. You also can consider the using of closed circuit cooling tower because it can reduce the demand of make-up water and reduce the limescale deposited during heat exchange process.
( Know more about JH closed circuit cooling tower. )
JH has been manufacturing closed circuit cooling towers for 20 years. We specialize in solving issues related to scale deposits, cooling of industrial equipment and machine maintenance. Feel free to contact with us.