Display MoreBefore you work out the heat exchanger abilities, consider a couple of points:
The available air inlet size is 1/2 of the window area, since the air both goes in and comes out of the middle window. Subtract a reasonable amount for heated air drawn back in, due to exiting right at the inlet. (No contraption was noted at the window that created separation of intake and exhaust air).
The steam pipe that supplies the heat exchanger will be about 30 m long. It should be roughly DN200 to prevent pressure buildup delivering the steam upstairs. That delivery pipe itself is a heat exchanger of sorts. Only a few degrees C prevent that steam from condensing en route to the posited upstairs heat exchanger.
There is no evidence whatsoever that the upstairs heat exchanger exited, so as far as I can tell, calculating the ability of said exchanger is a waste of time. Rossi could have put his endothermic sponge in the exchanger, making it highly efficient, needing less airflow, for example.
Awwww...
You are spoiling my fun! Rossi (via Wong and directly in his own deposition) claims this exists so it is nice to see that what he claims does not work!