stargeezer wrote:First off, your heat collection must be located lower than your heat storage. Then you must make sure that you are never trying to work against gravity.
I assume you mean that the heat must be no higher than the bottom of the storage and the collector output no lower than the top? Or does the whole collector need to be lower than the storage?
To rephrase a recent question about going over the lip of the hot tub ...
With an open tub, I gather this will work:
because the heat collector is at the same water level as the heat storage. Likewise, if all the water pipes stay filled with water, siphoning will allow this to work just as well:
But if the heat collector were higher or lower than the heat storage, then it wouldn't work, right?
That got me to thinking about a sealed system, like if the heat storage were a household hot water heater like:
If it's a sealed system, the pressures are in balance, so in theory I could put the heat storage in the basement and have the heat collector outside at ground level like:
... but then as long as the pipes in the open system above stay filled with water and are submerged, it should work the same way.
The gist is that the although the water may be higher or lower, any time it is moved, the same amount displaces it at the other end which cancels out the effect of gravity. Kind of like a bicycle wheel lifted off the ground: it can spin because when the weight on one side drops, the other side rises, so there is only inertia to overcome.
(P.S. Here's the OpenOffice drawing
if anyone else wants to play with it.)