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Heat and Cooling

Wood Stove Reco Fan (Build #2)

10 Dec , 2013  

Build #2 fan-working-on-stove-iPhone
The second build was a success. It was based on the Instructables guide by the author “tinkerme“. After reading the guide, I had a hankering to try again.

**Parts List**
– Hot side: a passive aluminum heat sink from a Power Mac G4 466

It’s roughly 3″ wide by 6″ long, lots of fins. The raised part for the chip, was cut off with a hacksaw and ground down.

– I was concerned the heat was slipping through the outside fins. Put a shroud around the hot side of the cooler. This would prevent the loss, and gather the heat. Found an aluminium control box from a washing machine. The shroud also prevented the heat from reaching the Thermalright cooler fins.

– little 1-1/2″ x 1-1/2″ square piece of copper. It was used as a spacer/transfer sat of heat to the peltier module. Use a copper pipe, cut length wise, pound flat and buffed up on the grinder.

– Peltier module (Claims it’s 90 watts, ebay@$10.00)
  – Model TEG1-12710 Note: Click here for a good web site about Peltier markings
  – 40mm x 40mm x 3.3mm
  – Power input from 0-16 volts DC and 0-10.5 amps (when used as a thermoelectric cooler)
  – Operates at temperatures as high as +350 deg F
  – Each device is fully inspected and tested
  – Fitted with 6-inch insulated leads
  – Perimeter sealed for moisture protection

– Zalman’s cooler paste. **A must have. This grey goop was cheap and was included with most CPU heatsink kits. It really increased the heat transfer and the voltage.

– Thermalright CPU Cooler. Rated for a 120mm fan. Aluminum base

–  1.5 to 3.0 Volt DC Hobby Motor **A must have. The earlier motor, needed a couple of volts to get running. But, hobby motor required 1.5 volts to start. So, I broke the “made-from-junk” rule and bought a small hobby motor for The Source (Radio Shack) @ $4.99

*Note: a standard 4″ computer fan didn’t work. Not sure how other people can get theirs going?

 Prop
  – The homemade, 2 blade, prop works OK, but the motor gets only up to .23 volts. Plan to work on it and make improvements
  – the fan from a blender gets up to .43 volt, but doesn’t push air at a lower RPM
– made a fan blade from a coffee can bottom, works good, lots of shake
– A plastic, 4 blade exhaust fan blade works the best. The only bummer was it’s made from plastic and could melt. So, made a heat shield for the bottom
Testing
– Had it successfully working on the December 7th weekend. The cut in for the fan blade was 100° Celsius (212° Fahrenheit) on the wood stove.
– Once I realized it was turning the wrong way, I reversed the positive and negative leads. It started to push the cold air through the fins and out the other side.

 

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