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Thread Number: 86678
/ Tag: Ranges, Stoves, Ovens
Oven design/baking performance |
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Post# 1112661 , Reply# 2 3/25/2021 at 12:25 (1,124 days old) by kb0nes  (Burnsville, MN) |
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Even with a microprocessor there will always be some set point hysteresis. Of course with a microprocessor you could have more adaptive algorithm if they bothered to deal with overshoot and tailoring element wattage to cavity heat loss.
There would be no need for different elements as power to the element could be controlled to an almost infinite degree with a simple Triac. The electronics would be quite cheap and could easily be bulletproof reliable too, this isn't the 60's anymore. Since the processor already exists, the electronic control would likely be cheaper to implement than using a mechanical thermostat too. But the real question is does it matter? Throttling the elements would result in lower element temperatures so less infrared energy which might hamper browning. This is likely a case of the perfect being the enemy of the just fine. | ||
| Post# 1112689 , Reply# 4 3/25/2021 at 17:06 (1,124 days old) by norgeway (mocksville n c ) | ||
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A perfectly constant Oven temperature was achieved many decades ago, All older pre 1960s gas ovens used a modulating flame oven control, these kept a perfect temperature, Todays junk will not, and can not keep as even a temperature. | ||
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Post# 1112693 , Reply# 5 3/25/2021 at 17:43 (1,124 days old) by henene4 (Heidenheim a.d. Brenz (Germany)) |
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Really? Gas ovens are extremely rare over here. I heard of the modulating gas dryer burner. Any model examples? Would love to read up a little... | ||
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Post# 1112694 , Reply# 6 3/25/2021 at 17:51 (1,124 days old) by kb0nes (Burnsville, MN) |
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Henrik, respectfully I think your experience with modern solid state high power electronics is behind the times.
Back in the 80's I was working on vapor-phase surface mount soldering machines and the solid state relay modules had no durability issues switching 40Kw resistive heating arrays. Today things are vastly more durable and much less expensive. We are only talking about controlling 10 amps here... A Triac switches quite quickly and while either on or off there really isn't a lot of resistive losses so not much heat. Design it with modules with zero crossing switching and than there is even less heating loss. As for the development, it is dead simple technology that is in common use today. Yes some software would have to be coded up but that is just software, write it once and it can be used in scads of units for no cost. Most of the ovens I am familiar with feed some amount power to the broil element to enhance browning. The ability to control the element balance more or less infinitely with a advanced controller could actually make the idea more appealing to tailor oven performance! I don't disagree that smoothing out the temperature variation may offer very little reward. Hence my comment on the perfect being the enemy of the very good. But it could be easily done | ||
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Post# 1112769 , Reply# 8 3/26/2021 at 10:03 (1,123 days old) by eronie (Flushing Michigan) |
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Reply #7 I hate a no it all that doesn't know what they are talking about, nuff said. | ||
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Post# 1113029 , Reply# 9 3/28/2021 at 15:09 (1,121 days old) by kb0nes (Burnsville, MN) |
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Google searches are a poor replacement for actual electronics knowledge.
Henrik I try to not be an ageist, but I graduated from electronics school 12 years before you were born. I have continued to work with electronics every day since and strive to stay current. Controlling an oven element would be easy with a few dollars worth of parts. If you switch at zero crossing the solid state relay efficiency is over 99%. Again it would be easy, cheap and reliable seeing as the microprocessor is already there. Still not sure it is worth the effort, but it would be a fun experiment. It would be neat to actually experiment and learn, vs guessing and Googling... | ||
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