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Thread: speeding up the cooling

  1. #1
    Senior Member robusto's Avatar
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    speeding up the cooling

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Weve talked about slowing down the roast, but what about speeding up the cooling.

    Gadgets are great, and I personally love them. Ive seen many inventive ways to cool beans quickly. But simplicity works well, too.
    I pour the hot beans into a steel colander. Steel, because it conducts heat away from beans, and doesnt melt! A non-perforated saucepan would probably work just as well.

    I then lift the colander about 30 cm and decant the beans into another similar colander, (sitting on the table, chair or whatever), while an ordinary small 150mm personal fan blows at them as they fall.

    The process is repeated quickly a few times for a minute or so, by which time the beans are cool to touch.
    Certainly any cracking is stopped dead, instantly.

    As the beans fall, they are naturally air cooled. They also lose heat to the metal colanders.
    The fan further cools them and-- best of all -- blows away whatever chaff the perforated barbecue drum roaster hasnt burned off already.

    Any stubborn chaff clinging to the beans is removed by either tossing them within the colander or swirling them around a little.

    It works well.



  2. #2
    Super Moderator Javaphile's Avatar
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    Re: speeding up the cooling

    If you want to stop the roast virtually instantly try quenching your beans with a fine mist of water. You want to use just enough spray to drop the beans temp but not so much that water remains on the beans.

    Java "Ugh, Ive had enough of water!" phile

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    Re: speeding up the cooling

    Java:

    I am surprised to hear you commenting favourably on water. I would have thought that even passing water would have been difficult for several weeks.

    Grant

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    Super Moderator Javaphile's Avatar
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    Re: speeding up the cooling

    Yeah well, ya gotta do what ya gotta do. :-/

    Java "Water is NOT my friend" phile

  5. #5
    Senior Member robusto's Avatar
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    Re: speeding up the cooling

    Javaphile, The only water Id like coming near my roasted beans is very hot --93 degrees *C.

    Ro "some like it hot" busto

  6. #6
    Super Moderator Javaphile's Avatar
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    Re: speeding up the cooling

    Robusto,

    Properly done (a fine enough mist in the proper quantity) no water is absorbed by the beans as it is all instantly turned to steam.

    You dont use the water to cool the beans with completely, just to get them below roasting temperature.

    Java "Water can kiss my you-know-what!" phile

  7. #7
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    Re: speeding up the cooling

    I usually quench the beans with a fine mister before using the same technique as Robusto, pouring from one container to another, even then if I can mange it Ill attempt to spray them as they fall between containers for the first couple of drops.

    Depends on the batch size but anything over 300grammes or so I find the air cooling takes too long without a water quench to begin the process. I had a pretty efficient bucket vacuum combo setup as others have documented elsewhere which I use at home base but away from home the colanders and water bottle do the trick.

    Some commercial roasters use a combination of water quenches and air drops as well

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    Re: speeding up the cooling

    Im intrigued by the water cooling thing - never tried it, cos i dont have a good spray bottle, but im still intrigued.

    My method is to dump the beans onto a pizza tray that sits on the window sill with a big fan blowing air across the top - As soon as Ive dumped the beans, I spread them out on the tray. Ive found that this cools the beans in about 5 seconds. Theyre completely cold to the touch after about 30 seconds, even less on these cold winter nights!

  9. #9
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    Re: speeding up the cooling

    I used to use a vacuum and hose set up, but it all got too complicated. Now I just use the motor section of the barrel vacuum.
    I have a large plastic bowl with some fine mesh wired in place about half way down the bowl. Ive cut a hole in the bottom of the bowl the same size as the vacuum inlet hole on the motor. I have it plugged in and standing by ready. As soon as the beans are ready, turn on the vacuum and tip the beans in. 20 seconds max. 8)

    Boris

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    Re: speeding up the cooling

    As the quantity that I roast are generally 500g at the most, the fan works well for me. Cools them down in 30 seconds. Also gets rid of any remaining chaff that are hanging around

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    Re: speeding up the cooling

    I was wondering if anyone has modified a popper so that one can turn off the heating element and just let the popper continue to blow cool(ing) air through the roasted beans?

    Or would there be too much heat still in the popper?

    If so, one could pour the beans out into a colander to quench them whilst simultaneously turning off the poppers heating elelment. Wait a few seconds then pour the beans back into the popper.

    Ron

  12. #12
    Super Moderator Javaphile's Avatar
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    Re: speeding up the cooling

    One of the standard mods out there for poppers is to split the heating and fan into 2 different circuits. Which would allow you to turn off the heat but leave the fan going.

    The problem with this is the beans continue to roast while the heating coil cools down as you mentioned. By the time the heating coil has cooled down completely the beans would already have been fully cooled using a seperate cooling set-up.

    Java "Mods are fun!" phile

  13. #13
    Mal Dimal's Avatar
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    Re: speeding up the cooling

    Quote Originally Posted by Javaphile link=1120187721/0#11 date=1122357816
    One of the standard mods out there for poppers is to split the heating and fan into 2 different circuits. Which would allow you to turn off the heat but leave the fan going.

    Java "Mods are fun!" phile
    You bet, but there is a much better reason for splitting the circuits up like that, eh Java ;) ,

    Mal.

  14. #14
    Super Moderator Javaphile's Avatar
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    Re: speeding up the cooling

    Behmor Coffee Roaster
    Quote Originally Posted by Mal link=1120187721/0#12 date=1122385009
    Quote Originally Posted by Javaphile link=1120187721/0#11 date=1122357816
    One of the standard mods out there for poppers is to split the heating and fan into 2 different circuits. Which would allow you to turn off the heat but leave the fan going.

    Java "Mods are fun!" phile
    You bet, but there is a much better reason for splitting the circuits up like that, eh Java ;) ,

    Mal.
    Indeed Mal, indeed! ;D

    Java "Gotta love a good Mod" phile



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