Heat and Water Temps ??

"~ janj" wrote in message
...
On Fri, 04 Aug 2006 06:18:37 GMT, "Snooze" wrote:

Then put the giant ice cube in the top of the waterfall.

Good idea. I always figured one would put them bobbing in the pond.

Be sure and dechlor the water before freezing, or just leave in bottle. It
might even melt a bit slower in a sealed bottle. ~ jan

I agree, better safe then sorry. But I honestly don't think 2L of slightly
chlorinated tap water is going to be much of a danger when it's diluted with
7570L of pond water. 2L makes about 0.02% of the pond's volume. Of that, how
much of the original ice water is chlorine? We're talking about such a small
fraction, it's not worth the hassle.

-S

actually the phase transition from ice to water is 80 calories per gram whereas the
transition from liquid to gas is 540 calories per gram.
http://weloveteaching.com/fall2005/m...of_matter.html
better to spritz the water up into the air and what falls back is going to be a lot
cooler. best is shade cloth, like 70% or lilies that float and block the sun.
actually, a piece of styrofoam that blocks the sun works too. Ingrid


Take advantage of basic chemistry. Use water in an alternate form. Namely
ice. It takes a lot of heat energy to melt ice. Heat energy that can come
from the pond.
Math:
Heat 2L of ice @ -5C
2000mL * 5C * .5cal/CmL = 5000 calories
Melt 2L of ice
2000mL * 80cal/mL = 160000 calories
Heat 2L of ice water to 26.6C (80F)
2000mL * 1 cal/CmL * 26.6C = 53200 calories

Cool 2000 gal (7570L) pond by N degrees
7570L*1000mL/L * 1cal/mL * N = 218200 calories
N = 0.028C ~= 0.03C






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wrote in message
...
actually the phase transition from ice to water is 80 calories per gram
whereas the
transition from liquid to gas is 540 calories per gram.
http://weloveteaching.com/fall2005/m...of_matter.html
better to spritz the water up into the air and what falls back is going to
be a lot
cooler. best is shade cloth, like 70% or lilies that float and block the
sun.
actually, a piece of styrofoam that blocks the sun works too. Ingrid
====================
2 x 4' sheets of white Styrofoam can be found at any Home Depot or Lowe's
and last for years. We use the old bedsheets suspended above the water
because they don't block gas exchange at the water surface as floating
Styrofoam sheets would.
--
KL....
Frugal ponding since 1995.
My Pond & Aquarium Pages:
http://tinyurl.com/9do58
~~~~ }((((* ~~~ }{{{{(ö ~~~~ }((((({*

wrote in message
...
actually the phase transition from ice to water is 80 calories per gram
whereas the
transition from liquid to gas is 540 calories per gram.
http://weloveteaching.com/fall2005/m...of_matter.html
better to spritz the water up into the air and what falls back is going to
be a lot
cooler. best is shade cloth, like 70% or lilies that float and block the
sun.
actually, a piece of styrofoam that blocks the sun works too. Ingrid



That assumes that the humidity level is low enough to support evaporative
cooling. Presumably the waterfall and other water circulation features
already maximize the evaporative cooling potential.

Reminds me of what one of my profs used to say. Try both, see what happens,
then report back to us.

-S