Gallery, Projects and General > The Design Shop
Heat Pipes
buffalow bill:
Hi,
Most of my workshop is in storage and the house is up for sale so at the moment all I can make are plans. Being of retiral age, my aim is to reduce all house/shop running cost. I’m thinking about solar heating and came across this
but it raises several questions;-
How critticle is the 8ml and the volume in the pipe.?
How critile is it that all the air is out of the pipe.?
If all is sucessfull what temperature will the hot end attain – would it be better to braze the pipe work?
Bill
Sorry but my attemps to make the youtube thingy a link fails me!!!
David Jupp:
Probably not too critical on volume of solvent, though there is likely to be an optimum for particular sizes/conditions.
The method shown won't remove all the air, but will drive some out - this will reduce the internal pressure and lower the boiling point of the solvent.
Hot end temp will depend on the heat input - the pipe will merely 'shunt' away some heat to the cooler end (where hopefully it is removed if you have sufficient cooling capacity). Ignoring the fact that a thermal gradient is needed to get heat into the tube, the hot end will to some extent be limited by the boiling point of the solvent (assuming some liquid solvent remains). So reducing the internal pressure helps to hold down the hot end temperature.
Bernd:
Fixed the link for you Bill.
Bernd
buffalow bill:
Thanks for the reply David.
From your reply I take that it would be better for a slight increase in volume of solvent than a decrease.
My thoughts for home heating,
1, using the heatpipes to collect solar heat.
2, transfering this heat into a transfer medium that will cope with low winter night temperatures
3, when in use does not consume any external energy
So the system---
Heatpipes 500mm long (because that’s how long the thermal vacuum tubes are) fitting these into a manifold, through wich antifreeze is passed. All this is outside and low down on the roof. After feeding the supply and return into the building. The hot pipe will rise up into a small heat exchanger to warm DHW then down into the under floor heating pipes, to rise up into the manifold return pipe. All circulating pipes to be a minimun of 22mm, the DHW heat exchanger at this moment in time is just another unknown. The under floor heating will be several 15mm pipe loops. My thoughts are that this system is only to provide background heating, so no pumps or thermostates will be used, may be or may be no!!!
Bernd thanks for the fix!
How are you at fixing other things ie my depleating number of brain cell s ?
( still make a balz trying to put them thar icons in ?)
Bernd:
--- Quote from: buffalow bill on August 08, 2011, 05:46:41 PM ---Bernd thanks for the fix!
How are you at fixing other things ie my depleating number of brain cell s ?
( still make a balz trying to put them thar icons in ?)
--- End quote ---
Quite OK there Bill.
As far as the brain cells go, can't help you there, but the icons are easy. Once you've written your sentence do a space and then click on the icon of your choice.
Take a look at what I have written back to you here by clicking on quote and you'll see the format of the message. :nrocks: Look at the banna holding the madmodder rock sign you'll see how I added it in to the sentence. Hope this is helpful.
Sorry about the :offtopic: reply here, but we aims to please. :beer:
Bernd
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