Originally Posted by ggray
Can these compartments be accessed from the interior
cabins by cutting holes? If they can, use some fans to circulate the cabin air.
For lining the floor of my bow compartments, I got some mesh material made for installing under roofing and it helps air movement up there.
I'm guessing you are interested in ventilation mainly at the dock
. If so, I don't think you would have much problem with rain entering the vents you are looking at. We had one in the main cabin of our previous boat, left open all the time, and water never came in. Crashing seas on the bows would be different.
Curious about your external heat pump
. So that brings outside air in?
Thank you, ggray.
Ventilation at the dock, but generally, I would like it to be whether docked or sailing. Water (and moisture) is what gives us all life, but also death
(and things in between, like mould, fungi, insects and all kinds of other baddies). I don't mind mould and other growths, as long as they are not in or on my boat.
I found that cockroaches
can live for months without food
, but only about two weeks without water
. Since we applied the "always dry" concept
, we have seen one (1) cockroach in 2 years, so I added new traps again. When we bought the boat, one hatch was marked as "has a moisture issue". Not any more now. Apart from those remote compartments, we are seldom over 65% RH inside. Added benefit: In the summer, even with an awning, it takes a lot of A/C to keep the boat comfortable inside. We often run close to 85 F inside but found that as long as it's rather dry, it's fine. We don't need 65F / 40% RH! Outside is hovering around 100 F in the summer, and 85-95% RH, coming inside to 85F / 50% RH feels plenty cool
To keep us dry, I got an "R2D2 shaped" air-air A/C, put it in the cockpit
at the helm
and then let the cold exhaust
enter the main saloon
. Foam boards for ducting, looks like cr** but works wonders. Obviously removed for sailing, or we would need an endless extension cord!
This A/C uses the condensed water to further cool itself down, while the model we had before had a drain pipe for that. The new one works even better than the old one, and we only use the Webasto 12,000 BTU on board when it's really hot.
Because the "R2D2" is pumping air in
, it makes a positive overpressure. Had we put it inside and connected it as designed, it would expel the hot air but in turn, draw in false air everywhere else on the boat
. This is a great mistake in the use of simple A/C setups - people don't realise that when you pump something out, something else must come in. Smell from heads, moisture everywhere.
This over pressure air finds its ways all throughout the boat
, and exits at any leak, hatch, LPG drain, heads and so on. As for the heads, it's brilliant - it makes sure no odours enter the main cabins. And after shower
, it dries up quickly (again - I just hate things staying moist for too long). Despite quite moderate air flow for the boat, it is sufficient: As long as the dry air comes in and moist air goes out - boat stays dry. Everywhere the air can find its way.
Finally - front compartments: Yes, we have made small holes (some were there already from existing installations like wiring) to vent some of the air. In fact, because of our R2D2, we don't even need extra fans, as there is already an overpressure from the cabin. All we need is ventilation from those compartments to the outside
. Letting air inside isn't enough, it needs to be able to further escape, or no air will enter
. I don't like water to be able to enter, though - hence my original question in post #1.
So I still need to find something that will allow air to escape, but not rain/waves to enter. Is it clear as milk tea now ?