Solar
Heating
Using Sodium Ethanoate (Sodium Acetate),
And Evacuated Solar Thermal
Collector Tubes To Create A Cloudy Day Backup Heat Storage Medium
For
A Solar Domestic Hot Water Or Solar Hydronic Space Heating
System
Years ago, there were on
the market some re-usable hand-warmers, that could be recharged
by boiling water and then activated at a later date when needed.
If you are contemplating
a Solar DHW or Hydronic Space Heating System, have you considered
using a sodium ethoanate backup storage system?
That can be made to work
with the evacuated tube type of thermal solar collector.
That way, you can just
save up extra solar heat on sunny days to use on cloudy or
sunless days.
The storage would be composed
of an extra water tank filled with sodium ethanoate trihydrate
(sodium acetate trihydrate), or hydrated crystals of sodium
acetate. If the solid crystals are heated with heat from Solar
Thermal EVAC tubes, to the boiling point of water, the water
molecules will be released from the crystals. This freed water
can then dissolve the sodium acetate.
After cooling, the sodium
acetate remains dissolved even though the solution is supersaturated.
This means that the energy that was required to release the
water molecules from the crystals and dissolve the sodium
acetate into that water still remains in the system even though
the temperature has dropped.
Then, when backup heat
is needed, a small seed crystal is injected with a trap door,
or an automatic small air pressure pump gun. The seed crystal
triggers the crystallization of the sodium acetate trihydrate.
When the crystals form,
the magically stored past energy that was required to initially
dissolve them is then released. This release of energy raises
the temperature to 129.2 °F, or 54°C
That is an ideal domestic
hot water temperature!
It is very close to what
is needed for bioDiesel tranesterification too!
Technically, this is heat
that is released during a phase change.
It is an exothermic chemical
reaction.
The process is theoretically
repeatable indefinitely, although the seed crystal gun, or
small sodium ethanoate trihydrate seed crystal supply, will
need occasional replenishment.
Solar Thermal
Capture Tubes
http://jchemed.chem.wisc.edu/JCESoft/CCA/CCA3/MAIN/ACETATE/PAGE1.HTM
http://jchemed.chem.wisc.edu/JCESoft/CCA/CCA3/STHTM/ACETATE/ACETAT1.HTM
http://www.howstuffworks.com/question290.htm
http://static.howstuffworks.com/mpeg/q290.mpg
http://home.howstuffworks.com/framed.htm?parent=question290.htm&url=http://thermo-pad.com/faq.htm
With
Best regards
FREE
ENERGY
Patrick
Ward
Richmond
VA
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