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BamZipPow
The Grim Reaper
The Grim Reaper


Joined: 02 Aug 2001
Posts: 22179
Location: Driving EEp all over the place...

Post Posted: Tue Feb 21, 2017 8:28 pm   Post subject: Homemade Blast Chiller... Reply with quote Back to top  

Since picking up a bunch of Slappy's 92mm fans a few years ago, I've been playing around with them in different projects. I've noticed that there are fans in a convection oven, fans fer a laptop cooler, and fans fer a blast chiller to aid in their thermal management. Wink Smile

I got to thinking that maybe I could use a few of these fans and a half dead PSU on a cheap mini fridge or beverage fridge and convert it into a homemade blast chiller. Big Smile

I haven't found anything on the Internet that someone has documented a conversion so I figured I would put my project on here. Wink Smile

Any thoughts?

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BamZipPow
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anglachel
Guide Dog
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Joined: 08 Nov 2003
Posts: 9491
Location: MN

Post Posted: Wed Feb 22, 2017 8:10 am   Post subject: Reply with quote Back to top  

Most freezers that have fans in them are "frost free" types.

Frost free freezers will cycle just above freezing (on the coil side) to keep the condensated water from freezing on the coil (which will impact efficiency because the air has to pass over the ice, not the coil...)

I don't know how a blast chiller normally works, but the coils freezing up in a homemade version seems like it's bound to be a concern unless you have unlimited access to dry air (perhaps in your part of texas you do.)

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BamZipPow
The Grim Reaper
The Grim Reaper


Joined: 02 Aug 2001
Posts: 22179
Location: Driving EEp all over the place...

Post Posted: Wed Feb 22, 2017 6:53 pm   Post subject: Reply with quote Back to top  

Blast chillers are super expensive...like 4 figures just to super chill hot items quickly. I haven't had the opportunity to play with one yet as most places that would have them probably wouldn't let me anywhere close to their kitchen. Sad Smile

I'm not looking to freeze anything...just looking to build a inexpensive blast chiller using these 92mm computer fans, a half dead PSU, and a mini fridge (which is far from being frost free since the freezer section is basically open to the fridge. Wink Smile

I'm basically building this to chill my fresh fruit pies and desserts quickly so they will set in minutes instead of hours in a normal fridge. A commercial pie safe or display is out of my price range as well as a commercial blast chiller. Wink Smile

So the fans will be aimed at the bottom of each pie plate and a couple of fans in the freezer section (door removed) to circulate the cold air quicker. I'll install some digital thermometers to keep track of the temps of each level. I'll have my super accurate thermometer in the pie to see how quickly the temps reach their ideal temp. Wink Smile

I guess I should call this a blast cooler... Big Smile

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