Peltier controlled fermentationy device

[dontbother]

[quote="chris2012"]

Rule of thumb for me is 1deg drop is an hour.

(I've had a few issues with the graphing code, but this does capture an hour)
http://mycrap.mellon-collie.net/piTempM ... 71.rrd.png

[chris2012]

I presume that's for a 5 gal batch right?

cheers!

[BenB]

Boingy - yeah I agree entirely, the peltier water should be cooler than the beer temp, I'll have to double check that.

BenB - yeah that's a nice idea on using a hair dryer!

You don't happen to also have a graph showing your beer temp too per chance?

No, unfortunately I didn't have a waterproof sensor at that point. I suspect it probably followed fairly closely- if there was a significant difference I would have expected the large thermal mass of the beer to prevent the air cooling that much. But that's me guessing

[dontbother]

I presume that's for a 5 gal batch right?
cheers!

good point... 27 litres in the fermenter - out in the garage it was probably ~10degC ambient.

[chris2012]

I was gonna use a hairdryer as that seemed a good idea.

However I've just been informed of these little beauties:

http://www.hobbyking.co.uk/hobbyking/st ... mbled.html

[BenB]

It's a nice fan but do be aware that it's a brushless motor so you'll need a brushless speed controlled. The good news is they're cheap. You'll also need a servo tester to control the fan speed. All of those can be obtained through hobbyking. One thing to be aware of is that axial fans like that (and hairdryers infact) lose litres per minute quite quickly in the face of back-pressure. Centrifugal fans are much better in that regard.

Something like Ebay 161590291339 is going to be a lot simpler (no need for ESC or servo testers) and will run happily on the 12v from your PSU supply. And it will deal with back-pressure nicely. Although the muppet has put cash on collection despite saying he accepts Paypal and it's economy tracked delivery. Suspect if you win and pay via Paypal he won't send it in the post. Although Ebay would cremate his testicles if he didn't. But there are other blowers out there....

Just a thought....

However you do it it's likely to be quite noisy. Just depends on the pitch. A 3300kv f/c fan on 12v is going to scream but then going round at 39,600rpm you imagine it might be a wee bit!!