I've seen some designs that actually use water as the transport and many-finned radiators at each end. Radiator transfer heat into cold water inside which is pumped up a radiator in the sub-zero temps on the roof and exchanged and then looped back. Same basic principle as a traditional residential heat-pump that loops through the ground 20 feet down or so. I think using straight air would probably not be as efficient as a closed-loop water transfer. On Wed, 5 Nov 2003, Joe Abley wrote:
On 5 Nov 2003, at 11:22, Neil J. McRae wrote:
google search for "air to air heat exchanger" - there are many companies that make products that do exactly what you want.
I'd be interested to see if these actually save any money. I'd guess that the cost of moving the air around is going to be a factor.
Seems to me that you have to move air regardless of what you use to cool it.
Joe