Posted by Eeyore on September 2, 2007, 6:16 am
dances_with_barkadas@yahoo.com wrote:
> reference:
> http://www.engineeringtoolbox.com/hydrogen-d_976.html
> Hydrogen has more than triple the heat-storage-capacity of water.
> Safe storage of H2 in cylinders is a standard technology. But I don't
> see it being used for heat storage.
> Why not?
Hydrogen has a very small molecule so diffuses through just about everything.
In other words, it leaks out. It's also explosive.
Waxes with melting points similar to your desired storage temperature are
excellent at storing heat as much of it is stored as 'latent heat' whch is a
very efficient way of storing heat.
Graham
Posted by BioFreak on September 2, 2007, 11:24 am
On Sat, 01 Sep 2007 13:45:41 -0700,
dances_with_barkadas@yahoo.com wrote:
> reference:
>
> http://www.engineeringtoolbox.com/hydrogen-d_976.html
>
>
> Hydrogen has more than triple the heat-storage-capacity of water.
> Safe storage of H2 in cylinders is a standard technology. But I don't
> see it being used for heat storage.
>
> Why not?
The heck is "heat storage". Go do yourself. If you need
to give, go give it to him:
http://www.shabnameh.org/images/ehsasBJm.jpg
--
"rafti sare manbar!"
- Jalal Ale-Ahmad
Posted by Don Young on September 6, 2007, 9:36 pm
>-> >> Some states is the US also require a gas water heater to be equipped
> -> >> with a "vacuum breaker" valve on the water feed line, which allow
> air
> -> >> to enter the tank if a negative pressure were to develop in the
> water
> -> >> supply line. This can happen if a fire developes in the
> neighborhood,
> -> >> and the fire department is heavily pumping from nearby fire
> hydrants.
> -> >
> -> > An anti-vacuum valve can be anywhere on the tank. Why on the incoming
> cold
> -> > mains pipe?
> -> I would think it's to prevent siphoning of water from any part of the
> -> househould plumbing back into the municipal supply lines.
> -> Don Young
> We wouldn't want our water to be sucked out and used for fighting
> someone else's fire, would we?
> dow
I think the concern is possible contamination of the municipal water supply
lines from anything introduced into the household plumbing. There are quite
a few cross connection, air gap, check valve, vacuum breaker, and
anti-siphon regulations to help prevent this. I make no judgements as to
whether said regulations are necessary or worthwhile.
Don Young
Posted by Jim on September 7, 2007, 10:17 am
>-> > We wouldn't want our water to be sucked out and used for fighting
> -> > someone else's fire, would we?
> -> >
> -> > dow
> -> I think the concern is possible contamination of the municipal water
> supply
> -> lines from anything introduced into the household plumbing. There are
> quite
> -> a few cross connection, air gap, check valve, vacuum breaker, and
> -> anti-siphon regulations to help prevent this. I make no judgements as
> to
> -> whether said regulations are necessary or worthwhile.
> -> Don Young
> Sounds to me like something a lawyer thought up.
Legislators make laws, lawyers simply twist them to their clients
advantage.
> dow
Posted by Arnold Walker on September 7, 2007, 3:00 pm
> reference:
> http://www.engineeringtoolbox.com/hydrogen-d_976.html
> Hydrogen has more than triple the heat-storage-capacity of water.
> Safe storage of H2 in cylinders is a standard technology. But I don't
> see it being used for heat storage.
> Why not?
Because helium and nitrogen does better with far fewer explosion when it
leaks.
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> http://www.engineeringtoolbox.com/hydrogen-d_976.html
> Hydrogen has more than triple the heat-storage-capacity of water.
> Safe storage of H2 in cylinders is a standard technology. But I don't
> see it being used for heat storage.
> Why not?