[ZeroID (Brent)]

Originally Posted by rcheshire

Has anyone considered modifying the airflow through the heat exchanger. Theoretically, when air is expanded into a plenum it cools. If airflow inside the cooler box is ducted through a narrow duct (between the vanes of a heat sink at the point of maximum cooling) and then expanded into the camera box would there be a further and measurable drop in temperature.

Rather than locate the fan over the heatsink (exchanger) place it to one side and cover the top of the heat sink with a plate to form a series of parallel ducts and channel the flow through the heatsink, expanding it into the cooler box.

I think you'd be needing a lot more compression than can be acheived within a small closed cycle enclosure. Internal circulating fans as used so far have been tiny CPU units just designed to shift the enclosed dry air (hopefully) to cool the camera by moving heat to the TEC plate for removal to the external heat radiator. Also need to be as vibration free as possible.
We've been able to get quite usable temp drops (16-20*) within the box. The real issue is to get and maintain that at the sensor when the camera body is designed to protect it so well. Professionally modded cameras are in some cases being reduced to skeletons in order to achieve this I believe.