Hedges
I See Electromagnetic Fields!
- Joined
- Mar 28, 2020
- Messages
- 21,479
Didn't find the thermal resistance easily for that; catalog link had that as a search parameter.
Large fin pitch of 12.5mm won't interfere much with air flow, should work decently for convection.
I haven't done anything in airflow analysis or thermal transfer, just "ohms law" with thermal parameters.
Forced air vs. passive will make a huge difference. My experience was something passively cooled (a vacuum pump) drawing a few watts was almost too hot to touch. With a tabletop fan aimed at it, it was stone cold. Our "Expert" said the pump's max ambient temperature spec limited the spec of our system to less than that figure. I attempted to explain (without success) that the part (a Pfeiffer pump) really didn't have a requirement for ambient temperature, rather case temperature. Once we determined case temperature in its specified 45C environment, by using a fan we could operate at higher environmental temperature such that derived case temperature spec was met.
Large fin pitch of 12.5mm won't interfere much with air flow, should work decently for convection.
I haven't done anything in airflow analysis or thermal transfer, just "ohms law" with thermal parameters.
Forced air vs. passive will make a huge difference. My experience was something passively cooled (a vacuum pump) drawing a few watts was almost too hot to touch. With a tabletop fan aimed at it, it was stone cold. Our "Expert" said the pump's max ambient temperature spec limited the spec of our system to less than that figure. I attempted to explain (without success) that the part (a Pfeiffer pump) really didn't have a requirement for ambient temperature, rather case temperature. Once we determined case temperature in its specified 45C environment, by using a fan we could operate at higher environmental temperature such that derived case temperature spec was met.