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Thread: Bean Cooler Thermo fan?

  1. #1
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    Bean Cooler Thermo fan?

    Gene Cafe Coffee Roaster $850 - Free Beans Free Freight
    Anybody able to tell me if a thermo fan would make a for a good bucket bean cooler?
    Just wondering about CFM of various devices...? I use an exhaust fan (bathroom type) in a big bucket and it gets my 300g cool in about a minute. It isnt particularly strong though and Im guessing thermo fans would have a much higher output and they usually operate in high temperatures. A couple Ive seen on eBay mention 2100rpm and 820 CFM Are those figures any good? I guess the alternative option Im thinking of is a shop vac.


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    Re: Bean Cooler Thermo fan?

    The shop vac is a better idea I think. It will cool down beans un under 30 seconds, and still be useful for cleaning up.

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    Re: Bean Cooler Thermo fan?

    Good point.

    What size roast are you cooling in 30 seconds?

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    Re: Bean Cooler Thermo fan?

    I use a barrel vacumm. The dust collecting half is removeable so you can empty it, exposing the air intake for the motor. A 90mm down pipe and joiner allows me to sit my flour sifter on top. 2200w of GE suction gets them cool in less than 20 seconds *8-). And when its clean up time, the vacumm is out and ready to go. ;) I roast about 300grams max.

    Things to consider. Are you sucking the air over the beans, or are you blowing air over them. A sealed suction unit has inherent heat ramifications, the initial air volume is quite hot, so the motor could suffer damage if made from plastic. A blower unit would require a retention/ collection method and would require greater effort to deliver the same cooling effect as the suction method, given that compressing the air is going to heat it up.

    Boris

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    Re: Bean Cooler Thermo fan?

    Thanks Boris

    That is pretty much the crux of it. I considered pushing air because it would aid in chaff removal, but I figured pulling air would be easier and more effective. I am concerned about killing whatever is doing the sucking with hot air. The thermo fan can pull or push air but I dont know if the volume of air moved would be as high as a shop vac would move. The upside of the thermo fan is that it built for hot environments.

    I do like the dual purpose of the shop vac though...

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    Re: Bean Cooler Thermo fan?

    Gadgets are great, and having motorised bowls and drums etc adds a professional and necessary touch. when roasting.

    But when it comes to cooling beans --- Fresh air does it quickly and best.

    Pour out the beans into any steel container like a colander.

    From a height of 30 or 60 cm, pour these slowly into a second container, and repeat the process a few times.

    As they fall through the air theyll stop cracking in seconds.

    If you also have a small desktop fan blowing air through them as they fall, theres an added advantage of all the remaining chaff being blown away.

    Robusto.

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    Re: Bean Cooler Thermo fan?

    It all depends on whether you intend to cool the beans in an enclosed space or not. Chaff is fine being unleashed on the world, but it does make a serious mess in the confines of a shop/garage.

    Shop vacs take heat better than normal house vaccuums. Youd be better off with a slightly longer hose, so if there is any "super heated" air, it cools off before getting into the vaccuum. Better to be safe than sorry.

    Its not the agitation of the beans, more the volume of air flow around them that cools faster. The majority of the chaff should really be expelled during the roast, leaving only a tiny bit to be left to deal with at the cooling stage.

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    Re: Bean Cooler Thermo fan?

    Luckily, I have no space problem --- barbecue is out the back, chaff collects nicely in a corner of the patio and then is swept (or blown with the fan) into the adjoining garden where it begins a new life as mulch

    Robuso

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    Re: Bean Cooler Thermo fan?

    nunu,

    The long hose idea sounds workable. I wonder if some aluminium ducting (if it exists) would disperse the heat, youd think it would radiate heat much more readily than a plastic hose.

    Thus far it looks like a long aluminium (if possible) hose attached to a shop vac.

    Thanks guys

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    Senior Member Lovey's Avatar
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    Re: Bean Cooler Thermo fan?

    Gday Framey,
    Have a look in a car spare parts shop like Repco for some flexible metal tubing.
    In older cars theres a piece of flexible metal tube that connects between the exhaust manifold and the carb intake (I did say older cars ;)) which recycle the exhaust gas for emission control. I dont know what its made of but it looks like vacuum cleaner pipe and its made of some sort of metal, maybe aluminium.
    Hope this helps,
    Steve.

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    Re: Bean Cooler Thermo fan?

    If you can find ducting that small, by all means use it. Otherwise, you can get away with several stages, the cooling "chamber" connected to the large diameter duct. Then you transition to the shop vac hose from the larger diameter ducting, via some sort of connector that lets you to remove the vac hose, thus allowing you to vaccuum other stuff at your leisure.

    Another good feature of a shop vac, is you can hook the hose to the outlet, and it becomes a blower. Use this to evacuate chaff from the beans. Just construct a way to catch the chaff, else you have snowflakes in summer. :P

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    Re: Bean Cooler Thermo fan?

    As much as I loath their global invasion, Bunnings stock a flexable Aluminium tube, about 90mm in diameter and about 500mm long. I use normal PVC, because its stronger and rigid. As far as heat concerns for my old vacumm, have you felt the motor of a vacumm after you finish the house? It copes just fine.

    Boris ;)

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    Re: Bean Cooler Thermo fan?

    Actually, I just lost a vaccuum due to the motor burning up. I dont think it had anything to do with it being a bean cooler, but the thing was getting on in years, so I chocked it up to fair wear and tear.

    I still have my modified flour sifter to cool the beans, but dont have a vaccuum at the moment. Looks like I need to scout around at council cleanup day.

    The modification is cutting a 2L PET soda bottle near the top, so it just fits inside the bottom of the sifter. Using some duct tape, I sealed the bottom of the sifter and bottle, so that the opening of the bottle is the only place for air to go. The 2L bottle opening fits perfectly into the vaccuums hose, then I just hang it from the top of my workbench. The flour sifter will easily cool 300g of beans in a single go.

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    Re: Bean Cooler Thermo fan?

    Behmor Coffee Roaster
    Reading this thread is giving me bad ideas.

    Ive got a perfectly good vacuum that could easily become the basis of a bean cooling device.

    AND.... (heres the good part)... it gives me a perfect excuse to finally get that Roomba robotic vacuum Ive been pining over for so long ;D
    http://www.irobot.com/sp.cfm?pageid=122

    Is it just me or do others here, who grew up watching the Jetsons on TV, feel ripped off that we dont yet have robotic "everything" running our lives..... I feel that adding a Roomba to my tech-portfolio is the LEAST I can do to further that quest.

    And I get a bean cooler to boot....

    Eveyones a winner.... right ;)



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