Accessory Caravan fridge fans.

Submitted: Saturday, Jan 05, 2008 at 11:16
ThreadID: 53129 Views:7161 Replies:6 FollowUps:7
This Thread has been Archived
Hi, To any of you smart people out there with vans , has anyone fitted a electric fan(s) on the top exhaust vent on the van to draw air thru on the hot calm days. Fridge works realy well when breeze come from that side but with a warm north ( other side)wind it starts to defrost.
I heard about PC fans but I think these are 12v and I was looking for 240v if I could.
Any suggestions or hints would be great.
Thanks Des.
Back Expand Un-Read 0 Moderator

Reply By: Jim from Best Off Road - Saturday, Jan 05, 2008 at 12:10

Saturday, Jan 05, 2008 at 12:10
You can get 240v PC fans from Tricky's, I fitted one to the back of my stereo amp at home.

Also I believe it is better to fit to the bottom vent to push the air through, but I'm no expert.

AnswerID: 279913

Follow Up By: DesF - Saturday, Jan 05, 2008 at 12:35

Saturday, Jan 05, 2008 at 12:35
Hi, Jim ,thanks for the reply, just a point who is " Tricky's " ? and I just thought that sucking the hot air out would work better , but always open the suggestions and idea's, at least if I can get the fan I can just zip it to the vent and try it both ways. also any idea of the price. Cheers Des,
0
FollowupID: 544087

Follow Up By: Jim from Best Off Road - Saturday, Jan 05, 2008 at 13:39

Saturday, Jan 05, 2008 at 13:39
Sorry Des,

Dick Smith. About $25 from memory.

See reply below for link.

0
FollowupID: 544098

Follow Up By: Mainey (wa) - Saturday, Jan 05, 2008 at 14:24

Saturday, Jan 05, 2008 at 14:24
Des,
Your idea "I just thought that sucking the hot air out would work better" is correct....

For an example look at any electrical appliance, Fridge, Computer, Inverter etc they all suck out the hot air from inside the appliance, this brings in fresh air to move across the electrical components (heat exchangers in a fridge), it's the movement of the air that makes it affective.
Put the fan where it will draw the hot air up and out through the top exhaust vent to the outside of the van and it will bring in fresh air from the lower vent to replace it creating the cooling cycle, because the air coming in is cooler than the air it replaces.

Mainey...
0
FollowupID: 544109

Follow Up By: Crackles - Saturday, Jan 05, 2008 at 22:59

Saturday, Jan 05, 2008 at 22:59
The 2 computers and fridge I have draw the cool air from outside & blow it directly accross the electrical components/condenser. Either way it's going to blow/suck a similar amount of air through, the main difference being if the fan is after the heat it will run hotter and be more likely to burn out. That's why I fitted mine (12 volt) to the bottom & has worked well for me maintaining the temp in the fridge on a much lower setting.
Cheers Craig..........
0
FollowupID: 544204

Follow Up By: Mainey (wa) - Sunday, Jan 06, 2008 at 00:08

Sunday, Jan 06, 2008 at 00:08
If you 'force' the outside air with a fan, INTO the area needed to be cooled, the air is forced (funneled) in almost a straight line, through the limited (fan) area into the cabinet and exiting the cabinet area at all crevice and gaps at various air pressures.

However, when the air is forced (sucked) OUT of the same cabinet area via an exhaust fan, the air is drawn from every-where within the cabinet area, and yes those same crevices and gaps too, and exiting via the exhaust fan area, therefore drawing hot air from everywhere within the cabinet area.

The exhaust fan is manufactured to withstand heat created by the fridge or inverter electronics as it has to be covered by warranty, remembering the air movement also cools the fan too.

The cooling is created by air 'movement' over the components, in this way even warm/hot air will still cool the cabinet’s internal components.

That's the reason people sit in front of a fan on hot days. It's still blowing the same hot air in the room on the people, but the 'air movement' creates a cooling effect, ask anyone who uses a fan as a cooling device in a tent in the Northwest lol

Have checked my 12v fridge and inverter, both do work by sucking the hot air OUT of the cabinet, hence cooling the electronics.
Mainey...
0
FollowupID: 544220

Reply By: Member - Alan H (Narangba QLD - Saturday, Jan 05, 2008 at 13:03

Saturday, Jan 05, 2008 at 13:03
http://dseau.resultspage.com/search.php?sessionid=&w=240v+fan&site=&submit.x=10&submit.y=6

Try here - Dick Smiths
AnswerID: 279921

Follow Up By: Member - Alan H (Narangba QLD - Saturday, Jan 05, 2008 at 13:06

Saturday, Jan 05, 2008 at 13:06
240V Fans

Sorry stuffed the link up.
0
FollowupID: 544093

Reply By: DesF - Saturday, Jan 05, 2008 at 14:54

Saturday, Jan 05, 2008 at 14:54
Hi, Thanks to you all for the reply's, That's just what I am after, will be down in the city in week or so , will get one from DS at Elizabeth.
great help thanks again fella's Cheers Des.
AnswerID: 279929

Reply By: Rod E B - Saturday, Jan 05, 2008 at 15:45

Saturday, Jan 05, 2008 at 15:45
I put a dc computer fan so then it would work when you are in the bush , does not draw much juice

I fitted it to the inside of the top vent with those electricians strap thingos ,

It draws air from the bottom over the heaters
AnswerID: 279936

Follow Up By: DesF - Saturday, Jan 05, 2008 at 16:36

Saturday, Jan 05, 2008 at 16:36
HI, Thanks but we dont normally take the van bush , usually the tent , but it would be nice to have a big fan in the tent thru the day.
But also I have a Jayco wind-up van and it cools down quick. Cheers Des.
0
FollowupID: 544145

Reply By: Member - Graham H (QLD) - Saturday, Jan 05, 2008 at 22:58

Saturday, Jan 05, 2008 at 22:58
Have a look here a very knowledeable organisation

http://www.springers.com.au/Products.aspx?CategoryID=17


Also look on this Forum for a thread which had pics of how to baffle rear of fridge to increase air flow and thereby cooling
www.supertramp.com.au
AnswerID: 280005

Reply By: DesF - Sunday, Jan 06, 2008 at 15:19

Sunday, Jan 06, 2008 at 15:19
Hi Fella's, just a question, what air flow do I need , I see the
12v fans vary
90mm does 42.30CFM
120mm " " 108 CFM
240V only do
120mm ---- 87CFM Bearings
120mm --- 85CFM bushed,
I realise the more air the better but I really wanted to use 240volt , do think they will be good enough?
Whats you veiws?
Cheers Des.
AnswerID: 280096

Sponsored Links