I also was thinking of the heat of compression, and that storing it in
caves would cool it considerably, but then read "NRStor is joining up with
Massachusetts-based General Compression Inc.,  which developed a
compressed-air technology that uses heat exchangers in a  so-called
near-isothermal process instead of fuel." There have to be losses in the
heat exchange process, and to what are the pumping the heat? I guess if
they heat water high enough with the heat, they could use it to drive
turbines as well. My geothermal heat pump heats the water heater with
excess heat in the summer, I guess they could do the same.
I do think that using gravity to store the excess energy via pumping it up
hill, and letting it run down through a turbine would be better though.

On Wed, Jun 24, 2015 at 2:39 PM, fmiser via Mercedes <mercedes@okiebenz.com>

> Interesting idea.
> I think if there is a hill that pumping water to the top will
> probably have less losses.  One issue with compressed gas is
> the act of compressing it makes it hot, and for long term
> storage that heat will be lost.  The greater the pressure,
> the greater the heat and the greater the loss.
> If they have figured out a way to effectively use
> low-pressure air to generate electricity, it might work out
> really good.  But if it's just a turbine, high pressure makes
> the turbine more effective, so there will be a compromise
> either way.
> Short term storage - as in day vs night - the heat could be
> retained and then the system looks pretty good.  Except for
> the explosion dangers.
> --  Philip, speaking before reading up on the details

OK Don

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