Fan CFM Computation

[JOEYRDC]

Guys,

I need some help regarding the Fan size needed for my Sensor Module (unit size of 5x3x1 inch) project
The product is mounted on the Lid of a Oven/BBQ Grill which is place outdoor
The temperature inside the Grill or on the Lid surface is max at 350C and the Ambient/surrounding is at 40C
Then, inside the Sensor module are electronics that need to maintain an internal temperature of 60C so that it will not damage the components
I need some help on how to get the right CFM size in order to control the temperature below 60C

Thanks in advance for your insights

 

[BrianPetersen]

What happens if the compressed air source fails?

What happens if the end user says "I don't have compressed air, but I'm hungry, so I'm going to use the barbecue anyway"?

Something needs a fundamental re-think.

- Eliminate whatever the fancy electronic gizmo is that warrants temperature control in the first place. My barbecue sure doesn't have, nor need, any such thing.
- If for whatever reason that's not viable, redesign the gizmo so that it's not attached to the high-temperature part of the barbecue. If there's a sensor that needs to sense something, use one that can handle the heat and mount it remotely.

 

[MacGyverS2000]

A high-temp glass light pipe might resolve the issue... that way, you can put the electronics as far away from the heat source as you'd like.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[btrueblood]

From a review article here

https://www.fastcodesign.com/306566...ything-thats-wrong-with-silicon-valley-design

:

This salmon had become more distracting to babysit than if I’d just cooked it on my own. This salmon had become a metaphor for Silicon Valley itself. Automated yet distracting. Boastful yet mediocre. Confident yet wrong. Most of all, the June is a product built less for you, the user, and more for its own ever-impending perfection as a platform. When you cook salmon wrong, you learn about cooking it right. When the June cooks salmon wrong, its findings are uploaded, aggregated, and averaged into a June database that you hope will allow all June ovens to get it right the next time. Good thing the firmware updates are installed automatically.

It amuses me that a certain segment of the user base (like, say, me - if somebody bought one for me) is likely to think it funny to, for instance, put yesterday's newspaper in the oven, tell the oven software that it's filet mignon, and proceed to reduce said paper to charcoal...and have the oven update its database accordingly.

Back to YOUR proposed device: why a lithium battery and not something less prone to exploding if it gets a bit hot, and easier for consumers to replace (e.g. standard alkaline cells)? I like Mike's suggestion, and thought myself of a periscope up one side of the chamber, with camera safely ensconced down below the hot grill casing.

 

[MacGyverS2000]

I'm not sure why a battery is even necessary. The beast is plugged in... if it needs to sustain short power outages for time-keeping purposes, install a cap. It's like a VCR that needs resetting after a power outage, so I see no need for an expensive battery that causes even more headache because you have to design around it.

Dan - Owner

http://www.Hi-TecDesigns.com

 

[chicopee]

Another method of getting cool air is the Hilsch tube which would require compressed air for the inlet of the tube. Anyone who took thermodynamics would have been analytically exposed to calculate the temperatures of the hot and cold exhaust air.