I've been staring at them too long, lol!
Some observations:
-the convected heat exits the BeCooling unit, instead of being allowed to raise the ambient air temp, for the subsequent passes past the first row of tubes in the DangerDen cube. That's probably the most important difference, IMO.
-The tubing in both designs is of copper. the fins are crimped aluminium.
-The BeCooling 5x10's fins are corrugated, where the DD cube's fins are flat, but that should have little influence, in favor of the 5x10 (IMO).
-The fin density is 16 per inch on the 5x10, where it's 8 per inch on the cube. This is probably a significant factor (IMO), but can't single-handedly explain the performance gap. I always thought that a fin-to-gap ratio between 1:5 and 1:8 was ideal for air convection. What's the fin thickness?
-Tubing in the DD cube is 1/4", the BeCooling unit's is 3/8", so the flow velocity should be higher in the DD cube, which should be favorable to cooling, despite the pressure drop.
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