Patent 9803929 was granted and assigned to Baltimore Aircoil Company on October, 2017 by the United States Patent and Trademark Office.
A heat exchange apparatus is provided with an indirect evaporative heat exchange section. An evaporative liquid is downwardly distributed onto the indirect section to indirectly exchange sensible heat with a hot fluid stream flowing within a series of enclosed circuits which comprise the indirect evaporative heat exchange section. An ideal flow rate for such evaporative liquid is between 2.0 and 4.0 gallons per minute per square foot of top surface area of the indirect heat exchange section.