The performance of cooling towers is closely related to what is known as approach. A cooling tower is considered good in performance when its approach is low. So, what should you know about approach in cooling tower?<\/p>\n\n\n\n
In cooling tower, approach is the temperature difference between the entering wet-bulb temperature and the leaving water temperature. <\/strong>For instance, if the ambient air enters a cooling tower at 82\u00b0F and the cooling tower produces water at 86\u00b0F, then the approach is 86-82 = 4\u00b0F.<\/p>\n\n\n\n The approach tells us a lot about a cooling tower. Understanding the pros and cons of high\/low approach can give us a better understanding of this equipment.<\/p>\n\n\n\n While there are numbers constantly mentioned about the approach of cooling towers, for instance, 85\u00b0F leaving water temperature, 78\u00b0F ambient wet-bulb and 7\u00b0F approach, there is really no standard for the associated temperatures.<\/p>\n\n\n\n However, a general rule for the range of cooling tower approach is 3 to 7\u00b0F<\/strong> with 5\u00b0F being the average.<\/p>\n\n\n\n Because the ambient wet-bulb temperature vary based on geographical location, the “standard” is different from person to person.<\/p>\n\n\n\n For example, in Malaysia (where I live), cooling towers are often designed based on an entering\/leaving water temperature of 95\/86\u00b0F with an ambient wet-bulb temperature of 82\u00b0F. So, the approach is 4\u00b0F.<\/p>\n\n\nStandard Cooling Tower Approach<\/h2>\n\n\n\n