thermo switch with fan and speed control

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mart001
Posts: 1
Joined: Fri Nov 01, 2013 3:27 pm

thermo switch with fan and speed control

Post by mart001 » Fri Nov 01, 2013 3:30 pm

Hi,

I need some help getting started with a Fan thermo stat system. I have a woodburner stove in a recess but the rear is to close to the wall, ideally I want to bring the stove forward but it can’t be done. To problems is heat staying at the top of the recess and not entering the room, the other is poor convection at the rear.

The stove top has a small lip at the rear so the gap is reduced at the top.

Two solutions are a fan at the top inside the recess pushing the air out and pulling air in, probably the best solution but it does get hot (over 200deg), fans do exist that run of the heat but cost around £150 (some are cheaper but I need it to be small).

The other solution is fans at the rear and bottom blowing air up. Hopefully this will also push air out of the top recess into the room.

The fans only need to gently move the air, to hard and swirls may occur and the air will never rotate out. I’m thinking two or three fans, probably small computer fans linked to a thermostat switch that switches on when a temperature is reached (~60deg maybe). It has to withstand high temperatures if I mount it on the stove ~350deg probably alot less in ambient behind the stove. It would be nice to have some kind of voltage regulator at the power point to change the fans speed.

So low voltage required, three fans, and a thermostat to switch on when heated. Any leads please

worldsbiggestdwarf
Posts: 1
Joined: Sat Nov 02, 2013 2:32 pm

Re: thermo switch with fan and speed control

Post by worldsbiggestdwarf » Sat Nov 02, 2013 3:28 pm

Hi some thing like this,
http://www.grainger.com/Grainger/WHITER ... itch-2E245
possibly working a transformer for the computer fans with a variable resister for adjusting the speed.

nehaali
Posts: 1
Joined: Tue Dec 17, 2013 4:53 am

Re: thermo switch with fan and speed control

Post by nehaali » Tue Dec 17, 2013 4:59 am

Hi,

I am new to electronics. I have a question regarding a transformer with secondary voltage as specified in the subject. Full wave bridge rectifier is connected to its output and voltage measured after being rectified is... 88 - 89V dc. This does not seem right since by my simple logic it should be around 48V. I used 1n4001 diodes to build the bridge. Also put 63V 100uF smoothing capacitor. Any ideas why this voltage is so high?
neha

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