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- Path: sparky!uunet!wupost!uwm.edu!ee!bloc1469
- From: bloc1469@ee.ee.uwm.edu (Gregory R Block)
- Newsgroups: comp.sys.amiga.hardware
- Subject: Re: The "cool" fan debate
- Date: 24 Dec 1992 06:05:25 GMT
- Organization: Electrical Engineering Dept. University of Wisconsin - Milwaukee
- Lines: 31
- Message-ID: <1hbjv5INNe35@uwm.edu>
- References: <1992Dec19.101213.1@oread.cc.ukans.edu> <1992Dec22.212412.10255@trl.oz.au>
- NNTP-Posting-Host: 129.89.2.33
-
- The problem is that with positive pressure airflow systems, the
- problems come forward thusly:
-
- 1) It is extremely difficult to arrange airflow in a way that brings a
- direct current of air across any one specified area.
-
- This is solved in negative-pressure systems by placing a vent
- in such a way that the air coming in would blow over the area
- to be cooled
-
- 2) Positive pressure airflow dynamics change the moment the physical
- layout changes. Specifically, let's say we have a positive-airflow
- 2000, with a vent on the left side of the case, next to all of the
- slots. The problem here lies in that dropping in ONE card will cease
- airflow across a huge expanse of the board now, and on top of that,
- any expansion cards in the machine will be cooled very poorly.
-
- 3) It is extremely difficult for a positive-pressure system to cool a
- large area properly without making use of more than one fan.
-
- These three problems are the reasons behind not using
- positive-airflow, even if it makes your computer that much cleaner on
- the inside.
-
- Greg
-
- --
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-