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Peltier cooling

 Post subject: Peltier cooling
PostPosted: Tue Mar 08, 2016 10:21 am 
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Joined: Tue Mar 08, 2016 9:28 am
Posts: 2
Hello everyone,

I am trying to control the temperature of a sample using a peltier element. My plan is to heat an aluminium plate using a cartridge heater but cool using a peltier. What my question is on peltier elements is how does it behave in extreme temperature differences? I may be heating the aluminium plate to 200 degrees celcius which would be touching the cold side of the peltier while the hot side is connected to a water block at ~ 15 degrees celcius. What would be the behaviour of the peltier?

Thanks in advance


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 Post subject: Re: Peltier cooling
PostPosted: Tue Mar 08, 2016 4:09 pm 
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Joined: Fri Jan 23, 2015 7:42 am
Posts: 18
Location: Sanford, FL.
Common Peltiers use a solder that melts below 200 degrees. There are high temp versions that may sustain that type of temperature. At the temperature differential mentioned, I'm not sure of the amount of work that can be done. However, the high temp versions should be able to survive that environment.

Why would you not use the Peltier to both heat and cool the sample as needed? I assume you're thinking that the Peltier can't provide the heart output you're looking for?


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 Post subject: Re: Peltier cooling
PostPosted: Thu Mar 10, 2016 3:18 am 
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Joined: Tue Mar 08, 2016 9:28 am
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Can the calculation for cooling rate at that temperature differential be calculated at all?

That was my initial idea to heat and cool the sample with just the peltier but I wasn't sure if it was an option. To heat one side to 200 degrees, the other side has to have a temperature of ~130 degrees since most peltiers (that I've seen anyways) goes up to 70 degrees temp difference. So unless I am providing steam in my water block It would be impossible?


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 Post subject: Re: Peltier cooling
PostPosted: Fri Mar 11, 2016 3:00 pm 
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Joined: Fri Jan 23, 2015 7:42 am
Posts: 18
Location: Sanford, FL.
Yeah, I don't know that you'll be able to get it to 200 on the hot side.


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