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Use of Thermostatic Metals for Air flow Path Control in Electronic Equipment Utilizing Forced Air Cooling

IP.com Disclosure Number: IPCOM000113052D
Original Publication Date: 1994-Jul-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 56K

Publishing Venue

IBM

Related People

Johnson, WC: AUTHOR

Abstract

Disclosed is a technique which allows air flow path changes within a forced air cooled electronic equipment. This technique allows the air flow to components/features which are changing temperatures due to power dissipation changes. An increase in power dissipated and not removed requires an increase or change in direction of air flow. A reduction in power dissipated requires less air flow.

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Use of Thermostatic Metals for Air flow Path Control in Electronic
Equipment Utilizing Forced Air Cooling

      Disclosed is a technique which allows air flow path changes
within a forced air cooled electronic equipment.  This technique
allows the air flow to components/features which are changing
temperatures due to power dissipation changes.  An increase in power
dissipated and not removed requires an increase or change in
direction of air flow.  A reduction in power dissipated requires less
air flow.

      Thermostatic metals (clad) better know as bi-metallic have been
used for many applications, but none known for this purpose.

      Thermostatic metals are dissimilar metals clad or bonded
together.  The metals have different thermal characteristics.  The
different thermal characteristics are the basics that make this
technique feasible.

           The different characteristics allow the bonded materials
to display unique features when heat is added (Fig. 1)

      The unique behavior of the thermostatic metals allow the air
flow paths to be changed to channel the air where it is needed at the
time, with no additional electronic circuitry.  Heat is the only
activation agent necessary.

      This technique allows the air to flow where needed most.
Variable flow to the hottest components/features allows the items to
stay at lower temperatures, thus increasing the Meantime Between
Failures (MTBF).

      A typical example is shown...