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Thread: bean cooler - work in progress

  1. #1
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    bean cooler - work in progress

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Gday! *Hoping to get some advice on my new bean cooler...

    Im going for the extraction fan sucking air through the beans approach. I wanted an all-in-one solution so I found a 30ltr bucket that I hoped would give me enough clearance above the fan to insert a sieve (or the like) and enough clearance below to exhaust the air.

    There is about 300-350mm clearance below the fan. Ive cut 8x60mm holes at the base - will this be enough - or should I consider doing another row? Or even cutting the whole floor out and making a stand to elevate?

    There is a gap of approx 10mm around the outside of the fan - should I seal this up?

    There is about 90mm above the fan to fit a basket/sieve. The bucket has a lid, which I intend to cut out an insert for the bean cooler basket/sieve – should I have a preference on shape?

    Options on hand:
    -round basket with concaved/curved base
    -square with flat base

    Possible purchase options:
    -round sieve with flat base
    -others?

    Anyhow – here are a bunch of pics, hopefully I’m on the right track!

    Cheers,
    Pete








  2. #2
    Senior Member greenman's Avatar
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    Re: bean cooler - work in progress

    Hi Pete, when I did my cooling box I used some aluminium fly screem mesh from Bunnings, its fairly cheap, might be worth a try!

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    Re: bean cooler - work in progress

    Quote Originally Posted by 594C5B5B50535F503E0 link=1240304589/1#1 date=1240306706
    Hi Pete, when I did my cooling box I used some aluminium fly screem mesh from Bunnings, its fairly cheap, might be worth a try!
    Thanks for the tip greenman, yeah that would give me heaps of surface area - Ill check it out!

  4. #4
    Sleep is overrated Thundergod's Avatar
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    Re: bean cooler - work in progress

    Pete I only used two exit holes; I think youve got plenty.

    No need to worry about the gap around the fan from what I can see of your setup.

    I bought a 30cm (IIRC) round flat bottomed sieve from my local junk shop for $5.
    I cut out my bucket lid to accommodate the sieve and it just sits on top of the bucket (no need to seat the lid).

    Yours is looking good.

    Does the red bucket make it cool faster?

  5. #5
    Senior Member Koffee_Kosmo's Avatar
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    Re: bean cooler - work in progress

    Quote Originally Posted by 7C6F6A3D353B340C0 link=1240304589/0#0 date=1240304589
    There is a gap of approx 10mm around the outside of the fan - should I seal this up?
    Try it first for suction if you get any suction from the exit holes then yes you will need to seal it

    Quote Originally Posted by 7C6F6A3D353B340C0 link=1240304589/0#0 date=1240304589
    Ive cut 8x60mm holes at the base - will this be enough
    I only have 3 on my cooler

    As for sieves I now use a gold prospecting pan that my father in-law gave me & it works great

    Good neat job by the way

    KK


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    Re: bean cooler - work in progress

    Thanks heaps for your ideas guys - looks like flat bottom is the way to go - might do another round of the junk shops, see what I can find.

    It seems I might have gone a little troppo on the exit holes! Oh well, shouldnt have a negative effect.

    Unfortunate about the red, wouldve preferred plain old white! *But you never know - I might save a second or two in cooling!! *:P

    I will check out the suction today. *I quickly fired it up last night - I expected it to vibrate a lot - but its very smooth and quiet.

    Cheers,
    Pete

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    Re: bean cooler - work in progress

    Ok - I found a great sized ss strainer with a flat base (junk shop - $3), installed today, going to try it out later today after I clean up the garage... *

    Because the strainer had straight walls, I stretched some black hose around to stop it falling through the opening - not so pretty but functional...

    Here are some picks...



  8. #8
    Sleep is overrated Thundergod's Avatar
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    Re: bean cooler - work in progress

    Looks like mine but I paid $5! :(

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    Re: bean cooler - work in progress

    Lookin good Pete..... [smiley=thumbsup.gif]

    Mal.

  10. #10
    Senior Member Koffee_Kosmo's Avatar
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    Re: bean cooler - work in progress

    Very nice unit Pete
    Also looks like you sealed the gap of the fan circumference

    I am sure you will get good results with such a unit
    KK

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    Re: bean cooler - work in progress

    Thanks guys - itching to try it out, I was hoping to roast up a batch or two today, but its seriously windy here!! Hopefully tomorrow...

    Yep, I decided to seal up the circumference around the fan - the black hose fitted nicely.

    I now understand what Thundergod meant about not needing to seat the sieve - could have just sat it on top with a smaller opening... oh well it might save me from losing a batch of beans if I accidently bump it.

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    Re: bean cooler - work in progress

    Just tried out the new cooler – it did a good job (I think) it cooled 550g piping hot beans down to room temp in about a 1:20, at 2min they were cold to touch. That was with basically no manual agitation – they’d probably cool even quicker if I stirred them every 10sec or so...

  13. #13
    Senior Member Koffee_Kosmo's Avatar
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    Re: bean cooler - work in progress

    Quote Originally Posted by 5E4D481F1719162E0 link=1240304589/11#11 date=1241247483
    Just tried out the new cooler – it did a good job (I think) it cooled 550g piping hot beans down to room temp in about a 1:20, at 2min they were cold to touch. That was with basically no manual agitation – they’d probably cool even quicker if I stirred them every 10sec or so...
    Thats good enough for me
    I have read somewhere that one should aim to cool the hot beans within 4 minutes

    KK

  14. #14
    Sleep is overrated Thundergod's Avatar
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    Re: bean cooler - work in progress

    IIRC my source said 2 minutes.

    But thinking about what you are attempting to do, stop further roasting, providing youve taken a good chunk of heat out of them initially, an extra minute or so only further decreases the temperature to handling range.

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    Re: bean cooler - work in progress

    awesome - sounds like Im all set - thanks for your input guys!

  16. #16
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    Re: bean cooler - work in progress

    FWIW
    I have almost exactly the same setup (though nowhere nearly as neat) but have rversed the fan orientation so it blows rather than sucks. I like the idea of blowing away the excess chaff.

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    Re: bean cooler - work in progress

    Does it blow off the beans too?

  18. #18
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    Re: bean cooler - work in progress

    I use a rather large fan that I happened to have lying around. I started with using a mesh colander ( I do a pound at time), stirring the beans around with glove on. During the hot summer it was taking too long to cool. I got a kitty litter tray with the bottom cut out and glued some aluminum screen material on the bottom. Now it cools a pound in less than 30 seconds no joking. The key is having the flat bottom to increase the surface cooling area.

  19. #19
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    Re: bean cooler - work in progress

    Quote Originally Posted by 5843584449585942490C0 link=1240304589/17#17 date=1244695657
    The key is having the flat bottom to increase the surface cooling area.
    Like the one pictured in Reply#6 above.

  20. #20
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    Re: bean cooler - work in progress

    Exactly.

  21. #21
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    Re: bean cooler - work in progress

    Behmor Coffee Roaster
    I think youre right on the money pcf, Im using a 20ltr bucket(paint pail) & a 20cm exhaust fan (both from big green shop). The fan just sits (friction fit) down in the bucket. I cut 3 holes - calculated the area of the fan blades, chose my biggest hole saw and cut a total exhaust area just larger than the inlet area. Found a metal "fruit basket" onsale $5 at the reject shop and support this in a cut out bucket lid. This has curved sides down to a flat base, so I have used 2 strips of gaffer tape around the top circumference to restrict the airflow to the base ( and accordingly, the bean mass. So far it seems to cool the beans (250gms) to ambient in under 1min. I will in future be trying it with 500gm
    It does seem to do the job





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