[SS2S-Main] Re: temperature controller with arduino

  • From: Tim young <tyoung489@xxxxxxxxx>
  • To: "sugarshot@xxxxxxxxxxxxx" <sugarshot@xxxxxxxxxxxxx>
  • Date: Mon, 30 Jun 2014 00:23:55 -0700

Opps,
I noticed that in the SS2S Curing Oven spreadsheet that you need to widen
the width of column "J".
Currently the value in cells J5 & J6 is 1.5 but because the column is too
narrow so it is displaying the number 2.
It shouldn't affect the calculations but it is confusing.


On Mon, Jun 30, 2014 at 12:00 AM, Tim young <tyoung489@xxxxxxxxx> wrote:

> Hello all,
>
> First off have you looked into the possibility of using an industrial oven
> at a local University or a local Business?  They may be receptive to
> helping out a grass roots project like this.
>
> I did some poking around & put together a little interactive spreadsheet
> of Basic Oven Parameters. This will help you evaluate more than just this
> one heating project.
>
>
> (sorry all dimensions are USA, I put in some conversion info)
>
>
> You can vary the:
>
>    Interior Oven Dimensions
>
>    Values for insulation (R Value & Thickness)
>
>    Starting Temperature
>
>    Maximum Temperature
>
>    Weight of product
>
>    Specific Heat of product
>
>    Time to reach Max Temperature
>
> and it will tell you:
>
>    Watts to heat product
>
>    Heat loss in watts
>
>    Total Watts
>
>    Interior surface area in Square Feet
>
> *NOTE:*
>
> *Total Watts* = (Watts to Heat Product + Heat Loss Watts) x 1.6
>
> This should account for Door heat loss, Probe heat loss, etc.
>
> If you are only going to build the oven for this project, with the
> conditions you gave (80-C) you should be OK using polyurethane or
> polyisocyanurate rigid board for insulation.  If you need to go to 200-C
> you should use Mineral / Rock Wool Batts (Not loose wool).  You may find
> that the mineral wool is less expensive than the foam insulation anyway.
>
> Vicente, with the example you gave, there is very little wattage required
> for this project.
>
> If you want to keep the cost at a minimum you should use the PID
> (REX-C700) you already have.
>
>
>
> With the PID you set the target temp & the controller automatically
> adjusts the heater output so you don’t radically overshoot the set point
> temp.
>
>
>
> With the amount of curing you have to do I would get a timer & a six-pack
> of beer or a bottle of wine.
>
>
>
> If you need to go from 25-C to 80-C at 10-C / Hr, then break the job in to
> 20-min increments.
>
> 1st 20-min 29-C, 2nd 20-min 33-C, etc till you get to 80-C. If you then
> set the timer for the soak time required for the Composite System you’re
> using and the PID controller will maintain the temperature..
>
>
>
> The least expensive way to obtain your original stated desire of having a
> system that has a programmable controller with an interactive graphical
> interface would be to go with the BCS-460. I understand your budget doesn’t
> allow you to purchase this. Perhaps you could hold a fundraiser to purchase
> one. Or perhaps there is a Home Brewer of Beer in your area that already
> owns one that you could borrow.
>
>
> Here's a link to a simple Curing Oven
> Airframe Composite Curing and Post Curing Oven
>
>
> http://www.privatedata.com/byb/rocketry/composites/ovens/Airframe%20Composite%20Curing%20and%20Post%20Curing%20Oven.html
>
>
>
>
>
>
>
>
> On Sun, Jun 29, 2014 at 9:52 PM, Peter Johansson <rockets4kids@xxxxxxxxx>
> wrote:
>
>> On Sun, Jun 29, 2014 at 8:40 PM, Nathan Asdourian <rawliquid@xxxxxxxxx>
>> wrote:
>>
>> [ ... arduino ... ]
>>
>> The Arduino is an incredibly awesome tool for its intended purpose:
>> Enabling artists to produce interactive art.  Beyond that my opinions
>> of Arduino drop off dramatically.  (I'll reserve the remainder of my
>> rant until asked.)
>>
>> > That said, it should be taken into consideration that you could get an
>> > actual pid controller for around the same price as an arduino uno r3.
>>
>> I too would agree that a COTS PID controller is the preferred way to
>> go *IF* it includes the capabilities to do the temperature profile out
>> of the box.  If you need to add a microcontroller to the PID box to
>> adjust the temperature, you are doing things completely wrong.
>>
>> [ ... description of software functionality ... ]
>>
>> I think we should let the person who volunteered to write the code
>> make a proposal as to what features he is willing to provide.
>>
>> -p.
>>
>>
>

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