#CPAP Cooling

I wanted to give you guys something to play with over the weekend…

We all know that CPAP tubes can be floppy, and especially on Tridents where top space is limited, that can cause issues…

You've probably all heard that the 7040 are not the strongest kids on the block, the 9290 are their bigger and stronger siblings that can significantly outperform them. The last months there have been talks about a third option, the WM7575, a 400W 220VAC all metal monster that promises an enormous performance jump, with a static pressure 4x higher than the 9290…

When choosing a toolhead, you also choose a part cooling fan with it. There are multiple possibilities, but it all comes down to the "flow rate vs air speed" argument…

I run some CFD simulations to have a rough idea of how much the diameter of the CPAP tube has an impact on the cooling performance. I tried to model 19mm OD vs 18mm OD tubes, so approximately 18mm ID vs 14mm ID, and I chose the worst case possible, to have an idea of the maximum impact…