Temperature Task

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Dark Sabre
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Re: Peltiers

Post by Dark Sabre » January 13th, 2011, 8:38 pm

Pandemonium wrote:Can someone explain to me why Peltiers are illegal? I mean, just the plate itself. According to http://www.peltier-info.com/photos.html, it is just ceramic plates, semiconductors, and copper. I'm asking about just the plate itself. As far as I know, ceramics and copper aren't electronic devices, and conductors are allowed.

I'm kind of confused by the whole IC thing, too.
You should probably submit a clarification on this. Peltiers are basically just a bunch of thermocouples lumped together. And while thermocouples are just a little lump of semiconductor, they are an electronic device and are not on the approved list. I wouldn't consider a Peltier legal. You might want to get an official opinion on that.

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Re: Temperature Task

Post by Uncle Fester » January 14th, 2011, 5:35 pm

I wouldn''t waste any time on waiting for a clarification.

I looked deeper into the Peltier Junction thing, and decided that I am not going to allow it in the five tourney's I'll be judging. It's NOT a simple copper or aluminum plate, It's a semiconductor (Selenium Telluride), and semiconductors other than LEDs are not allowed. Simple. Can't find a more absolute rule than that. As far as the plate, it's just a heat sink. But why would you scrap an expensive Peltier just for the heat sink? I have piles of far better heat sinks from old salvaged amplifiers that I can't GIVE away.

As far as Events Supervisors knowing about Peltiers, there's already a story circulating amongst them (us) about someone who tried hiding Peltier wires; whether it actually IS a true story (I personally don't think it is, parts of it are somewhat fishy) or not, the result is that most event sups now know about them. And they'll check.
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Re: Temperature Task

Post by sj » January 14th, 2011, 6:21 pm

I was looking through this thread and i see that people are saying they are trying bimetallic coils and nichrome wire. I was wondering how this worked since the rules call for a decrease in temperature...

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Re: Temperature Task

Post by JTMess » January 14th, 2011, 7:39 pm

You have to have the Nichrome preheated and then switch off the power so that the bimetallic strip cools and performs some action.
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Re: Temperature Task

Post by Pandemonium » January 15th, 2011, 6:05 am

Dark Sabre wrote:
Pandemonium wrote:Can someone explain to me why Peltiers are illegal? I mean, just the plate itself. According to http://www.peltier-info.com/photos.html, it is just ceramic plates, semiconductors, and copper. I'm asking about just the plate itself. As far as I know, ceramics and copper aren't electronic devices, and conductors are allowed.

I'm kind of confused by the whole IC thing, too.
You should probably submit a clarification on this. Peltiers are basically just a bunch of thermocouples lumped together. And while thermocouples are just a little lump of semiconductor, they are an electronic device and are not on the approved list. I wouldn't consider a Peltier legal. You might want to get an official opinion on that.
Uncle Fester wrote:I wouldn''t waste any time on waiting for a clarification.

I looked deeper into the Peltier Junction thing, and decided that I am not going to allow it in the five tourney's I'll be judging. It's NOT a simple copper or aluminum plate, It's a semiconductor (Selenium Telluride), and semiconductors other than LEDs are not allowed. Simple. Can't find a more absolute rule than that. As far as the plate, it's just a heat sink. But why would you scrap an expensive Peltier just for the heat sink? I have piles of far better heat sinks from old salvaged amplifiers that I can't GIVE away.

As far as Events Supervisors knowing about Peltiers, there's already a story circulating amongst them (us) about someone who tried hiding Peltier wires; whether it actually IS a true story (I personally don't think it is, parts of it are somewhat fishy) or not, the result is that most event sups now know about them. And they'll check.

Thanks guys. Looks like it's back to the drawing board me. :roll:

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Re: Temperature Task

Post by NikitaB » January 19th, 2011, 9:05 am

So are you guys essentially making hotplates out of the nichrome and putting your coils above them?

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Re: Temperature Task

Post by JTMess » January 19th, 2011, 2:36 pm

I was only able to heat about 5cm of Nichrome using a 6-volt lantern battery. What are you guys using for batteries?
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Re: Temperature Task

Post by zcshiner » January 19th, 2011, 7:28 pm

JTMess wrote:I was only able to heat about 5cm of Nichrome using a 6-volt lantern battery. What are you guys using for batteries?
We usually use rechargeable 7.2v RC batteries.

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Re: Temperature Task

Post by aubrey048 » January 22nd, 2011, 8:12 am

Would burning a monofilament count for the temperature task? My teammates are trying this and I want to make sure if its acceptable before they get too into it!
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Re: Temperature Task

Post by questionguy » January 22nd, 2011, 8:54 am

aubrey048 wrote:Would burning a monofilament count for the temperature task? My teammates are trying this and I want to make sure if its acceptable before they get too into it!
No, the task says you have to decrease the temperature of something, burning the monofilament would just be increasing it.

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