Ventilation

Share or ask any marine related technical information about not just Norfolk Broads boats but all vessels in general and help others to fix their boats.
nimue
Posts: 109
Joined: October 22nd, 2017, 11:09 am

Ventilation

Post by nimue » October 25th, 2017, 9:38 am

Since we have owned our boat the forepeak locker where we store all our junk has always suffered from cold and damp in the winter, so this week's project was to fit a low wattage 12v computer fan to circulate the air in there. It cost a grand total of two pounds and runs almost silently.
Using an incense stick I could clearly see the air movement, fresh air from the cabin being drawn in through the vents below and' stale' air coming out through the fan. The whole project cost about 6 quid plus a bit of time.
It will run continuously for the winter months. It's a bit early to see what difference it will make, but I'll keep you updated and let you know if it was worth it.



User avatar
High Seas
Site Admin
Posts: 1276
Joined: May 10th, 2017, 7:57 pm
Location: Earth
Contact:

Re: Ventilation

Post by High Seas » October 25th, 2017, 9:47 am

How much RAM does it have?
Liveaboard or liveathome?.....that is the question

nimue
Posts: 109
Joined: October 22nd, 2017, 11:09 am

Re: Ventilation

Post by nimue » October 25th, 2017, 10:13 am

According to the spec, it can RAM 44.6 CFM past the fan blades.............

nimue
Posts: 109
Joined: October 22nd, 2017, 11:09 am

Re: Ventilation Update

Post by nimue » November 7th, 2017, 11:14 am

Its been a couple of weeks since I installed a fan in the forepeak locker and it has been a real success. No more damp in there.
It still feels very cool in there compared to the rest of the boat. Bottles of wine ( sorry, wine display items) would often have some condensation on them but now they are dry. That got me thinking....
Another area that suffered in the winter was the storage under the seat units so I made a vent hole from the locker space which now vents behind the fridge. By coincidence, this summer I fitted 12v computer fans in the fridge cavity when it got really hot earlier this year, so now the fans pull air through about ten feet of locker space under the seats.
The last area that would have dripping windows in the mornings is the aft cabin, google reckons we can exhale up to 400ml of water at night, that's nearly a pint and it has to go somewhere, hence the wet windows.
There's a 100mm opening porthole in our aft cabin, but if we leave it open at night you can really feel a cold draught so we rarely open it in the winter.
I modified a bit of plumbing pipe and fitted one more fan into it and bingo, the wet air gets pulled out.
A surprising by-product of this little fan is that it draws warm air from the main cabin into the aft cabin and the whole boat is circulating air much more efficiently so we can turn the heating down a couple of notches and there are no more 'cold spots'.

User avatar
High Seas
Site Admin
Posts: 1276
Joined: May 10th, 2017, 7:57 pm
Location: Earth
Contact:

Re: Ventilation

Post by High Seas » November 7th, 2017, 12:56 pm

You know that is really quite clever, I would never have thought of it myself but you have got me thinking about using some of those fans as I reckon the power usage must be next to nothing.
You got any pics of the one in the locker?
In the winter I store food in the cockpit lockers as it is obviously freezing at times.
Storing beer in the bilges is good too, it's for the guests naturally.
Liveaboard or liveathome?.....that is the question

nimue
Posts: 109
Joined: October 22nd, 2017, 11:09 am

Re: Ventilation

Post by nimue » November 7th, 2017, 1:41 pm

These are the fans installed.
20171107_131807_resized.jpg
20171107_131807_resized.jpg
This is the outlet for the fan to outside, there's a modified 80mm computer fan fitted inside with a bit of bug mesh screen to keep them bugs out.
20171107_131807_resized.jpg

You can get them from Novatech

https://www.novatech.co.uk/products/coo ... fb-r1.html

or

https://www.maplin.co.uk/p/cooler-maste ... -fan-a04nn

and probably on ebay as well.
Power consumption is bugger all at 0.14A.
Attachments
20171107_132251_resized.jpg
20171107_132055_resized.jpg

nimue
Posts: 109
Joined: October 22nd, 2017, 11:09 am

Re: Ventilation

Post by nimue » November 7th, 2017, 1:42 pm

Sorry, the pictures duplicated and didn't quite come out in the right order, but you'll get the gist.

nimue
Posts: 109
Joined: October 22nd, 2017, 11:09 am

Re: Ventilation

Post by nimue » November 7th, 2017, 1:57 pm

The 'reverse dorade' vent at the back was a bargain, only 6 quid new, and it didn't come from a chandlery...........

User avatar
High Seas
Site Admin
Posts: 1276
Joined: May 10th, 2017, 7:57 pm
Location: Earth
Contact:

Re: Ventilation

Post by High Seas » November 7th, 2017, 2:06 pm

That's 12 volt?
Liveaboard or liveathome?.....that is the question

nimue
Posts: 109
Joined: October 22nd, 2017, 11:09 am

Re: Ventilation

Post by nimue » November 7th, 2017, 2:08 pm

Yes, everything is 12v

Post Reply