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Rapid Cooling Freezer Answered

Hi there,  I have a bit of an ambitious project at hand and would like some advice/ideas.  I have a commercial grade freezer that we are converting into an environment chamber that would be used to perform a rapid thermal test.  This rapid thermal test involves going from +65C to -10C in 2 minutes.  As it stands right now the freezer is not capable of achieving this rapid temperature change.  Thus I am looking for ideas/suggestions of how to retrofit this freezer to be able to achieve this feat.  The dimensions of the freezer are 27"x58"x46".  And this freezer would be used to stress test electronic devices that are enclosed in a plastic housing.  I have attached the spec sheet for the freezer that we are using.

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mpilchfamily

3 years ago

Attach a insulated canister with quick release valve to the top of the freezer. Fill the canister with Liquid Nitrogen and your good to go.

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Downunder35m

3 years ago

Simply impossible with a normal freezer, especially if you put hot things in it.

Go a different route and it might work, but not with an old fride or freezer.

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Tim_ChirsDownunder35m

Reply 3 years ago

One idea I have is simply using the freezer as an enclosure and then installing a rapid cooling system.

Do you think this idea might work? And if so what rapid cooling systems do you think could work?

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Downunder35mTim_Chirs

Reply 3 years ago

I would try it much more simple, KISS you know?
You want to check something that is +65° hot while it cools down quickly to -10°.
That means for me I heat the part up in a temp controlled oven.
Then to get the temp down quickly I would use colling spray for electronics.
However if you have the freezer set to -10 and use a long cooling tube inside you can use a simple airpump to get the cold air onto your test subject.
Or to have it more controlled put the part in a small enclosure where the cold air circulates in and back to into the freezer.