UDS blower size test


 
J

John Bostwick

TVWBB Wizard
Today, I will run a UDS at various blower sizes. I will be using a 28cfm blower, a Delta BFB1012HH, which I have been using for the past 5 years with a Heatermeter. So, to try to get different CFM's I will run at different percentages. The first two hours or so I will run at 23% max, which is close to the stock 6.5CFM. After, about 2 hours, I will up the percentage to equal 8.4CFM(30%), and then up it again to 40% and 50% and so on, to show what happens when you have a blower that's to powerful.

Granted, a 6.5cfm will probably be fine during the Summer months on a UDS, but during the colder months 6.5CFM it will have issues. As it will be constantly running(even during the summer months) and heat loss due to the colder air will be stronger then the blower can overcome.

The setup
PID
Bias 0
P 4
I .02
D 5
Rotodamper
Air Inlet 1 inch
Outlet Weber top fully open
 
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Note to self, before starting a test. start with new lump and not on a rainy day. My Basket was about 6 months old and most of it already had white ash on it. I got most of the loose stuff off and emptied the Ash on the bottom. I just could not get a stable temp if my life depended on it. Although, from what I could tell a 6.5CFM blower would be able to hold temps below 280, on warmer days as the blower was constantly on. So, if you planed on a smoke on a cold day, you probably would not be able to pump enough air into the UDS without opening other Aux. vent holes.

I am going to restest Monday with new lump, and see if I can get a better result then what I had today.
 
Have you thought about adding some more vents to your lid? I run a Guru on my UDS and my thought is the fan is big enough but I need more exhaust. I have nothing to prove this, just what I think, your thought on this?
 
I pretty sure that's not a issue as the only time I run into problem with the Weber air vent is when I have 28CFM blowing through the smoker, lol. I get smoke from all around the lid and any other place air can find an outlet.
 
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