I have an enclosure in which the electrical components put off 10,500BTU/hr. At the top of the enclosure the internal hot air is in contact with circular aluminum tubes. Ambient outside air at 70 degrees F is blown through the center of the tubes at 500cfm. Internal hot air and outside ambient air are seperated by the aluminum tube wall. It is a air to air heat exchanger of sorts. I need to determine if with 33 aluminum tubes I can remove the 10,500BTU/hr. How do I approch this problem, any online examples I can follow? Can I simplify and just look at what 1 tube is able to remove and then multipy to determine the systems capabilities?