[SS2S-Main] Re: temperature controller with arduino

  • From: "Jim Sealy Jr." <jimsealyjr@xxxxxxxxxxxxx>
  • To: sugarshot@xxxxxxxxxxxxx
  • Date: Wed, 02 Jul 2014 04:34:17 -0500

I have a home brew vegetable drier that uses the guts from a small ceramic (1000 watt electric) space heater from Walmart and a *Shimaden* digital temperature controller and a big wood box insulated with plain old pink insulation. It's been working in the temp range required here for years, so you might want to look into those as a possible heat source. I'm a big user of controllers like that for other things around the house too, having them on the sauna, hot tub, greenhouse, and wood drying kiln. COTS controllers like that are something to think about if reinventing the wheel isn't the top priority.

Jim Sealy

On 7/1/2014 9:41 PM, James Fackert wrote:

well insulated box and you only need a few hundred watts to get to any reasonable temp. no need for many btus.

jim fackert

On Jul 1, 2014 10:18 PM, "Nathan Asdourian" <rawliquid@xxxxxxxxx <mailto:rawliquid@xxxxxxxxx>> wrote:

    Not sure if 100c would work since they are mostly plastic, but I
    do have a similar sized metal one that is significantly
    stronger....uses 110v...
    Has anyone considered propane? My uncle out in Indiana makes his
    own roasters...typically trailer deals for a quarter hog or
    more...The last one he made I believe he used the burners from a
    couple old furnaces...he did manage to max out what the tank was
    able to put out...had to turn off one of the burners to get the
    pressure back up.
    Anyways, just a thought though for all I know the stuff is
    probably flammable

    On Jul 1, 2014 6:37 PM, "Lampe, Mattias SLC CT PEK"
    <mattias.lampe@xxxxxxxxxxx <mailto:mattias.lampe@xxxxxxxxxxx>> wrote:

        I had not seen that kind of convection cooker before, but it
        seems like a very good idea to me. 1200W seems to be a typical
        power value, and if that’s not enough you could just add a
        second one.

        I’d assume it would still make sense to put one or two
        additional fans inside the oven to move a bit more air.

        Is it safe to assume that 100 degrees (or maybe slightly
        higher) wouldn’t hurt a cheap (computer-type) fan?


        <mailto:sugarshot-bounce@xxxxxxxxxxxxx>] *On Behalf Of *James
        *Sent:* Tuesday, July 01, 2014 7:52 PM
        *To:* sUGAR sHOT TO SPACE LIST
        *Subject:* [SS2S-Main] Re: temperature controller with arduino

        how about using the lid/heating element/heat stirrer fan from
        one of those convection cookers that looks like a big glass
        pot? it is all integrated, built to take high temps, has temp
        control to act as safety temp limit and I think harbor freight
        has one on sale for $25.
        just need,circular hole in top of oven box.

        jim fackert

        On Jul 1, 2014 7:23 AM, "Redacted sender monsieurboo@xxxxxxx
        <mailto:monsieurboo@xxxxxxx> for DMARC"
        <mailto:dmarc-noreply@xxxxxxxxxxxxx>> wrote:

        Hair dryers / heat guns may be underengineered for the
        expected duty cycle and runtime. I've scratched my head about
        possible alternatives.  A couple suggest themselves as
        starting points:  1) small resistance-element type room
        heater.  2) toaster oven elements.  I think the latter may
        have already been mentioned in a previous post.

        (1) can certainly handle the runtime, and probably the duty
        cycle too.  Could it get the oven hot enough?  I suspect it
        wouldn't be a big problem, but it's a question. Probably best
        suited to an "outside the oven" type design.

        (2) is certainly robust enough to handle the oven environment
        and get it plenty hot, but might result in an oven with
        difficult "hot spots" -- and putting it outside the oven a la
        convection oven might make for an awkward build.

        Is there now some consideration of not recirculating or at
        least containing the heated air?  The "heat budget" probably
        won't allow for just venting it when the fan is running.

        Mark L.

        -----Original Message-----
        From: Lampe, Mattias SLC CT PEK <mattias.lampe@xxxxxxxxxxx
        To: sugarshot <sugarshot@xxxxxxxxxxxxx
        Sent: Mon, Jun 30, 2014 10:16 pm
        Subject: [SS2S-Main] Re: temperature controller with arduino

        Hi all,

        regarding SSRs, I have some spare ones I can send to Vicente,
        if needed.

        I don’t have much experience with thermal calculations and
        designs, but regarding the use of hair dryers/heat guns my
        idea would have been to NOT put the entire device into the
        oven – which indeed would cause some issues with the overheat
        protection and possibly melt some plastic parts of the devices
        – but to just use it to blow hot air through the chamber.

Other related posts: