How to measure BTU/hr. ?
I have made a simple air to air heat exchanger that flows 3 CFM of air and lowers the air's temperature 10 degrees F.
As far as I can tell this means that the heat exchanger has a capacity of 135 BTU/hour. I derived this by using the following formula:
BTU/hr. = CFM * delta-T * 4.5
Is this correct?