I think some of the other posts are probably simpler and more
appropriate, but if you did want to use a Pi here is a link to a plant
watering system that uses the resistance between 2 probes in the soil to
measure soil moisture.
http://www.raspberrypi.org/archives/4327
On 09/07/13 07:31, Vajk Fekete wrote:
If you seal 25Celsius 70% humidity air in, and cool that down to
10Celsius, you will have about 9grams of condensation per cubic meter
of air.
In my view this is not too significant. You only will have problems,
if fresh humid air can enter, and more water condensens from the fresh
air.
You can consider adding some silica gel (the one in inslulated window
glass panel frames) to the cavity.
Vajk
On Tue, Jul 9, 2013 at 12:35 AM, Peter Hollenbeck <pwhb...@gmail.com
<mailto:pwhb...@gmail.com>> wrote:
Good points.
All surfaces have at least two coats of epoxy. We may glass the
interior surfaces as we have the exterior of the hull. If we use
glass on all surfaces the process is: apply a thin seal coat of
epoxy. Dry. apply another coat of epoxy, then immediately the
glass, followed by a liberal coat of epoxy to saturate the glass
and adhere it to the sealed plywood. Exterior surfaces have more
epoxy to give a smooth base for paint.
My 1wire system tells me the humidity 6AM to 3PM today is 53 to
80%, even though it is a nice sunny day. This because we are about
20 feet from the ocean water of the British Columbia Inside
Passage and 30 feet the other way to the B.C. woods. So yes, we
will have sealed in moisture and I thank you for pointing this out.
When in the water the bilge should be quite cool, as the water
temperature is about 10C year round. I don't know what bearing
this has.
Will I not have a baseline to measure against? Let's say the
humidity is 70% when the bilge is sealed. I would take readings
then and again after the boat is launched. Periodically thereafter
I would take additional reading and expect them to be in the range
of the original ones.
I say again, OWFS is a great project with great participants. I
follow the list and try to learn from it but sometimes don't
understand a word.
Thanks, Paul.
Thanks, everyone.
On Mon, Jul 8, 2013 at 11:20 AM, Don Veino
<sourceforge_...@veino.com <mailto:sourceforge_...@veino.com>> wrote:
Looks like you have a nice project going. However, I'm going
to guess that no matter what you do, you are going to have
liquid water inside the compartments if you seal them shut.
Why? Unless you are building the boat in a desert in winter,
you will be sealing in relatively warm and humid air inside
the compartments. When the boat is in the water, the
compartments will cool and the moisture will condense.
Depending on the size of the compartments, the amount of
liquid water could be a few drops to something more significant.
I'm projecting your construction technique to mean exterior
epoxy coating but likely not interior to the compartments. If
so, then you have the opportunity for interior rot with water
contacting bare wood.
I built a small trailer with similar construction that was
very air tight and ended up adding vents and a drain plug for
this and other reasons. And yes, I did play with the idea of
installing a 1-wire network in the trailer to monitor
conditions and control some stuff. :)
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