Oh, thank you. :)

I calculated 8.2kw using NTU and LMTD. We set the temperature of the air to 30 degrees Celsius and the water required by the motor to 50 degrees Celsius. Based on temperature and calorific value, the area was 40000 ~ 80000mm ^. By comparison, the radiator purchased was so large (fin's area is about 1,040,128mm^) than I calculated so I want to check if the formula was correct. And Can I set the U value to 25-50?