Re: Does the cooling fan protect slides...?

[P3D Larry Berlin <lberlin@xxxxxxxxx>]

Both Dr. T and Gabriel commented about this:

>Thus it seems that yes the fan is not there to protect the film or even
>the lamp (if it has minimal ventilation holes which it does)and is not of
>the older type Bob Howard describes, but to protect the projector and more
>importantly the heat absorbing glass, the unsung hero.

In a sense this may be right. However, most systems are multi-dimensional.
The overall design of the projector should provide for the fan to create the
most airflow and direct cooling on the hottest parts of the projector.
Someone else mentioned that since heat flows upwards, they usually direct
excess heat in the direction it *wants* to go. In addition to this, the
projector should provide for sources of incoming air in such a way that it
helps cool other regions, such as the actual slide position.

In the carousel projectors that uses warm air to pre-pop the slides, it
seems there is ample airflow for maintenance of safe temperatures. No one
commented whether a significant flow passed through the slide chamber too.

It seems even if there may not be direct forced air over the projecting
slide, it is still a part of the equation for cooling in the overall system.
After all, the HAG wouldn't be there if it weren't for the sensitive slides
placed in the intense light path.

Larry Berlin

Email: lberlin@xxxxxxxxx
http://www.sonic.net/~lberlin/
http://3dzine.simplenet.com/


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