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From:	"Erich Heinzle (a1039181 AT gmail DOT com) [via geda-user AT delorie DOT com]" <geda-user AT delorie DOT com>
Date:	Wed, 7 Feb 2018 08:59:47 +1030
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Subject:	Re: [geda-user] Net length info question
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Not sure if it helps but you can generate spiral inductor footprints with
the following utility

https://github.com/erichVK5/SpiralInductorFootprintGenerator

Which reports the overall length of the spiral.

Maybe if you fill the pipes with saltwater and figure out the permitivity
of the ground you can make a tuned circuit too... The utility will also
calculate the inductance and capacitance!

If you are just running air through the pipes, you'll need to sort out
drainage of condensation.

Regards,

Erich

On 4 Feb 2018 00:36, "Richard Rasker (rasker AT linetec DOT nl) [via
geda-user AT delorie DOT com]" <geda-user AT delorie DOT com> wrote:

> Hi all,
>
> Maybe a rather unusual question, but at the moment, I'm "abusing" PCB in
> the construction of our new home, intended to rely on 100% solar energy: we
> plan to use the ground under the house for storing heat, by laying 3
> lengths of 100 m (~300 ft) of tubing in the foundations as a heat pump
> source. The heat is collected from PVT panels, a solar collector, and
> perhaps even a heat exchanger in the fireplace flue, and then sent through
> this underground tubing whenever the underground temperature is lower than
> the source temperature.
>
> (As an added bonus, the solar panels and the roof are cooled in the
> process, significantly increasing the panels' efficiency, and lowering the
> need for air conditioning on hot days.)
>
> The underground tubing comes in fixed lengths of 100 meters, and this is
> where PCB comes in: I created a plan of the foundation compartments where
> the tubing is laid in meanders or spirals (haven't decided which is best
> yet), using PCB's R function (Info -> Report Net Length) to check the total
> length of one 'tube'. Whit a bit of trial-and-error, I can neatly fill in
> the different compartments up to the total lenght, observing a minimum bend
> radius (arc tool, of course).
>
> Question (and the answer is probably 'no', but I'm curious anyway): with
> the cursor over the net, is there a way to report the net length up to the
> cursor, even when the total length is more? The actual tubing has markings
> at every 10 meters, and it would be convenient if I could duplicate this in
> the PCB plan -- but it might also be handy when designing CPU and memory
> buses for actual pcb's.
>
> Thanks already,
>
> Best regards,
>
> Richard Rasker
>
>

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Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto">Not sure if it helps but you can generate spiral inductor=
 footprints with the following utility<div dir=3D"auto"><br></div><div dir=
=3D"auto"><a href=3D"https://github.com/erichVK5/SpiralInductorFootprintGen=
erator">https://github.com/erichVK5/SpiralInductorFootprintGenerator</a><br=
></div><div dir=3D"auto"><br></div><div dir=3D"auto">Which reports the over=
all length of the spiral.</div><div dir=3D"auto"><br></div><div dir=3D"auto=
">Maybe if you fill the pipes with saltwater and figure out the permitivity=
 of the ground you can make a tuned circuit too... The utility will also ca=
lculate the inductance and capacitance!</div><div dir=3D"auto"><br></div><d=
iv dir=3D"auto">If you are just running air through the pipes, you&#39;ll n=
eed to sort out drainage of condensation.</div><div dir=3D"auto"><br></div>=
<div dir=3D"auto">Regards,</div><div dir=3D"auto"><br></div><div dir=3D"aut=
o">Erich</div></div><div class=3D"gmail_extra"><br><div class=3D"gmail_quot=
e">On 4 Feb 2018 00:36, &quot;Richard Rasker (<a href=3D"mailto:rasker AT line=
tec.nl">rasker AT linetec DOT nl</a>) [via <a href=3D"mailto:geda-user AT delorie DOT com=
">geda-user AT delorie DOT com</a>]&quot; &lt;<a href=3D"mailto:geda-user AT delorie.=
com">geda-user AT delorie DOT com</a>&gt; wrote:<br type=3D"attribution"><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex">Hi all,<br>
<br>
Maybe a rather unusual question, but at the moment, I&#39;m &quot;abusing&q=
uot; PCB in the construction of our new home, intended to rely on 100% sola=
r energy: we plan to use the ground under the house for storing heat, by la=
ying 3 lengths of 100 m (~300 ft) of tubing in the foundations as a heat pu=
mp source. The heat is collected from PVT panels, a solar collector, and pe=
rhaps even a heat exchanger in the fireplace flue, and then sent through th=
is underground tubing whenever the underground temperature is lower than th=
e source temperature.<br>
<br>
(As an added bonus, the solar panels and the roof are cooled in the process=
, significantly increasing the panels&#39; efficiency, and lowering the nee=
d for air conditioning on hot days.)<br>
<br>
The underground tubing comes in fixed lengths of 100 meters, and this is wh=
ere PCB comes in: I created a plan of the foundation compartments where the=
 tubing is laid in meanders or spirals (haven&#39;t decided which is best y=
et), using PCB&#39;s R function (Info -&gt; Report Net Length) to check the=
 total length of one &#39;tube&#39;. Whit a bit of trial-and-error, I can n=
eatly fill in the different compartments up to the total lenght, observing =
a minimum bend radius (arc tool, of course).<br>
<br>
Question (and the answer is probably &#39;no&#39;, but I&#39;m curious anyw=
ay): with the cursor over the net, is there a way to report the net length =
up to the cursor, even when the total length is more? The actual tubing has=
 markings at every 10 meters, and it would be convenient if I could duplica=
te this in the PCB plan -- but it might also be handy when designing CPU an=
d memory buses for actual pcb&#39;s.<br>
<br>
Thanks already,<br>
<br>
Best regards,<br>
<br>
Richard Rasker<br>
<br>
</blockquote></div></div>

--089e0826ea9063b04d056492b7f7--

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