Posted by nicksanspam on February 19, 2007, 5:21 pm
>If you want to store heat energy then phase change storage (substances
>that melt and freeze) is a very effective solution. Paraffin (wax,
>the US kind, not UK kerosene) is a very good medium. It has a decent
>heat of fusion and melts at a convenient temperature (~140 to 180 deg,
>depending on blend). There are companies that sell phase change media
>encapsulated in convenient balls that can simply be poured into a
>water tank to more than double the heat storage capacity of a tank
>full of water alone.
I'd like to double the heat in a 957-gallon 170 F STSS tank.
Got any brand names?
Nick
Posted by Eeyore on February 19, 2007, 6:18 pm
nicksanspam@ece.villanova.edu wrote:
> >If you want to store heat energy then phase change storage (substances
> >that melt and freeze) is a very effective solution. Paraffin (wax,
> >the US kind, not UK kerosene) is a very good medium. It has a decent
> >heat of fusion and melts at a convenient temperature (~140 to 180 deg,
> >depending on blend). There are companies that sell phase change media
> >encapsulated in convenient balls that can simply be poured into a
> >water tank to more than double the heat storage capacity of a tank
> >full of water alone.
> I'd like to double the heat in a 957-gallon 170 F STSS tank.
> Got any brand names?
Googling "wax balls" gives a rather less than useful result !
Graham
Posted by Anthony Matonak on February 19, 2007, 6:34 pm
nicksanspam@ece.villanova.edu wrote:
>
>>... There are companies that sell phase change media
>>encapsulated in convenient balls that can simply be poured into a
>>water tank to more than double the heat storage capacity of a tank
>>full of water alone.
>
> I'd like to double the heat in a 957-gallon 170 F STSS tank.
> Got any brand names?
A quick google search on encapsulated phase change material got
me this company...
http://www.microteklabs.com/phasechange.html
I don't know if this is exactly what Neon was talking about.
Anthony
Posted by Neon John on February 20, 2007, 12:49 am
On 19 Feb 2007 17:21:11 -0500, nicksanspam@ece.villanova.edu wrote:
>>If you want to store heat energy then phase change storage (substances
>>that melt and freeze) is a very effective solution. Paraffin (wax,
>>the US kind, not UK kerosene) is a very good medium. It has a decent
>>heat of fusion and melts at a convenient temperature (~140 to 180 deg,
>>depending on blend). There are companies that sell phase change media
>>encapsulated in convenient balls that can simply be poured into a
>>water tank to more than double the heat storage capacity of a tank
>>full of water alone.
>I'd like to double the heat in a 957-gallon 170 F STSS tank.
>Got any brand names?
Ball? :-) (you know, as in Ball jars and canning wax..)
I seem to not be able to find my bookmarked sites. I think I lost a
lot of bookmarks converting from Opera to Firefox. I could probably
round up the information but it'd take less time to google.
Look for "phase change heat storage balls" to start with. I used
these balls to about double the amount of hot water available from the
rather small RV water heater in a client's motor coach. He didn't
want to try to install a larger heater plus he was converting from
propane to diesel fuel water heat. I simply filled the existing
heater about half full of these balls and used it as the storage tank
for the new system. We disabled the propane burner and connected in
an Espar diesel-fired water heater and all was well.
If you can't find something after looking around let me know and I'll
dig through archived email where we discussed what product to use.
Unless you have a need for the sealed media, however, I suggest
looking at plain old paraffin. A tank of paraffin with sufficient
copper coils inside to effect the heat transfer to the water would do
the job.
John
---
John De Armond
See my website for my current email address
http://www.neon-john.com
Cleveland, Occupied TN
Don't let your schooling interfere with your education-Mark Twain
Posted by nicksanspam on February 20, 2007, 5:34 am
>>>... There are companies that sell phase change media encapsulated in
>>>convenient balls that can simply be poured into a water tank to more
>>>than double the heat storage capacity of a tank full of water alone.
>>
>>I'd like to double the heat in a 957-gallon 170 F STSS tank.
Something that melts at 100 F might be nice, eg the C20 material on
the site Anthony found, but their "macro" spheres are 4 mm max...
>>Got any brand names?
>Ball? :-) (you know, as in Ball jars and canning wax..)
I didn't see PCMs among the aerospace and packaging products on their site.
Maybe they stopped making them.
>Look for "phase change heat storage balls" to start with...
Lots of patents and studies and companies who might make custom products,
but Googling didn't turn up any standard stuff.
>Unless you have a need for the sealed media, however, I suggest looking
>at plain old paraffin. A tank of paraffin with sufficient copper coils
>inside to effect the heat transfer to the water would do the job.
The tank has an EPDM liner. I can picture paraffin clogging the draindown
"solar collector," 64' of fin-tube pipe near the top of an air heater.
Nick
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>that melt and freeze) is a very effective solution. Paraffin (wax,
>the US kind, not UK kerosene) is a very good medium. It has a decent
>heat of fusion and melts at a convenient temperature (~140 to 180 deg,
>depending on blend). There are companies that sell phase change media
>encapsulated in convenient balls that can simply be poured into a
>water tank to more than double the heat storage capacity of a tank
>full of water alone.