Airflow comparison of HeaterMeter blower/servo operation modes


 
I really wish China would work on their copyright laws. Looks like I'll be designing an SG90 top for the Adapt-a-Damper.

Any other ideas for design considerations? I'm afraid that if I make all the improvements necessary, it's gonna start looking just like the MicroDamper (dang you, SteveCK).
 
Steve,
I was wondering if it's even possible to run the fan first, then the damper.
I was thinking that if the damper was closed off and running the fan first (thinking that there will be leaks in the damper to still increase air flow) that maybe there won't be such a bump in the air-flow at 50% when operating it in the 'traditional' way, like you mentioned.
 
Wbegg, I thought I had you convinced way back to switch everything to SG90?

RKHanso, you can try running it anyway your imagination can think up (as long as it fits within in the software allowances). The only gap you have is the less than paper thin seam running between the top disc and the servo body housing though. Since the MicroDamper is designed with a lower static pressure axial fan (as compared to a blower) it wouldn't be able to pull much air through that gap until it reaches some decent speed. Once you start opening the damper you'd more than likely want to decrease fan speed to prevent a bump. Though running the MicroDamper the "classic way" is proven, I feel pretty confident that you'd be able to run it fan on only at startup or above say 90% on a particular pit. The challenge will be that you will have to basically retune your PID and fan settings to do so since you're creating a whole new system.
 
Begg, I think a large advantage that the Adapt-a-damper has is that it can swing a large angle if you designed it to. Now it all depends on how someone would choose to run their damper on their pit. But lets say that we want to run it like I've been stating above: "Fan on at Startup" and let's call it "Panic Mode" - where the pit requires so much air that the fan comes on at XX%. I think a damper opening shown in the pic below would be a good starting point. By reducing your intake size you make it more accurate, and leaving an area with a large intake allows you to blow large quantaties of air when required. Again, there are some minor challenges figuring out, for instance, A) when you want to transition to a large intake B) Cross sectional surface area of the small area. The downside to this is that by design you are regulating a certain PID output percentage to be your "Panic Mode" threshold. This of course could be minimized if you maximized your "Panic Mode" area by pushing them out the extreme edge of the damper and the servo.

1tVSVMm.png
 
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