This guy didn't do the math, but ended up doing pretty well with his "Earth Air Tubes".
Earth Air Tubes | Sugar Mountain Farm
Got me wondering if this idea is applicable to ASHPs? If you had your ASHP sitting on
the side of a hill, and had some buried air pipes coming up the hill, to emerge from the ground,
Right beside the air intake of your ASHP?
Maybe have a damper on the end, so the Geo-warmed air wouldn't flow, until the fan in the ASHP came on..
The cold air port at the downhill end, would suck in cold air, to be warmed up.
As the warmer air tended to flow uphill, to the output, it would still cool the tube..
But, if the HP was turning on and off, there should be some recovery in the tube, Back towards normal ground temp.
If the air picked up 10 or 20 degrees of warmth inside the tube,
it would give up that heat to the coil in the ASHP.
Some more..
301 Monroe» Blog Archive » Earth Tubes