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water in a pipe - Page 3

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Posted by nicksanspam on March 23, 2007, 8:14 pm
 


The pipe is $0. A 2'x20' aluminum sheet for a 2' tall x 6' diam tank
might be $0, an 8'x8' 2" double-foil foamboard cover might cost $0,
plus $0 for EPDM plus $0 for the transparent top plus a $0 pump
plus 2 $0 thermostats.

This could make 100% solar hot water in December.

Nick


Posted by dbljay7542 on March 25, 2007, 6:02 pm
 
On Mar 23, 4:14 pm, nicksans...@ece.villanova.edu wrote:

Could you please explain how this all goes together.


Posted by nicksanspam on March 26, 2007, 11:34 am
 
The unpressurized tank stores heat for a few cloudy days in about 400 gallons
of 140 F water. Pressurized cold water from the house flows into the 300' pipe
and back to the house, warmer. The tank is surrounded with lots of insulation,
with foamboard on top, under a layer of black EPDM rubber draped over raised
edges to make a shallow pond. During the day, a pump moves tank water up a few
inches over the rubber when the cover temp is more than 140 F and the tank is
less than 140 F. The NSF PE pipe is rated for 125 psi at 73 F but tested to
600 psi, and it loses about 10% of its rating for every 10 F temp increase.
The 140 F limit protects it from bursting.


A reflective north wall can help in higher north latitudes. To store more
heat, we could add some lithium or calcium chloride to the tank water and
float a tub inside the tank that collects distilled water on sunny days
and evaporates water on cloudy days.

Nick


Posted by Joe Fischer on March 24, 2007, 12:24 am
 On 22 Mar 2007 16:38:46 -0500, nicksanspam@ece.villanova.edu wrote:


           Nick doesn't read my posts, will somebody please
tell him the pipe coil should be laid flat in a spiral one
pipe thick, and a storage tank added indoors someplace
where the heat would not be a problem in summer.

            There should be plenty of pictures, descriptions
and plans for DIY designs on google links.

http://images.google.com/images?hl=en&q=solar+heater+coil&gbv=2

Joe Fischer


Posted by Ulysses on March 23, 2007, 2:38 am
 

heating

Currently I have about 150' of 1/2" black poly tubing coming from a small
tank to my house.  It is fully exposed to the sun.  By about 11:30 am on a
sunny day it is almost too hot for taking a shower.  By 1 pm it is scalding.
With my unusual (self-employed) lifestyle I am often able to take a shower
when it's convenient so I can almost always take a shower using perhaps 90%
solar-heated water and there's always enough hot water for me but I don't
have a lot of hair to wash.  OTOH I am planning on building a solar water
heater that'll do about 25-30 gallons in an insulated box with dual-glazing.
The exposed pipe cools off as soon as the sun goes down.



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