But when I put Heat Pipe in series with energy wheel, I am getting relatively lower temperature of outside temperature after energy wheel i.e. 26°C. So overall heat recovery system effectiveness is (46-26)/(46-23) = 87%.
In some AHUs the OA temperature drop is even low, i.e. after Heat pipe - Energy wheel OAT is less than 26°C. But i think, in any case my OA temperature will not go below 24°C (EAT temp). So my effectivess of Heat recovery system may come to Unity.
Someone please confirm, if I am on the right track?