Browse Prior Art Database

Closed Loop Liquid Cooling System for Workstation or PC

IP.com Disclosure Number: IPCOM000109220D
Original Publication Date: 1992-Aug-01
Included in the Prior Art Database: 2005-Mar-23
Document File: 1 page(s) / 41K

Publishing Venue

IBM

Related People

Hall, DA: AUTHOR

Abstract

The IBM line of personal computers and workstations must continue to offer higher levels of computing power at faster speeds. Attendant with increased performance will be higher heat loads on integrated circuit modules. Because cooling high heat density requires high velocity air, and noise increases with velocity, corporate acoustic specifications effectively limit forced air cooling and computing performance.

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Closed

Loop

Liquid Cooling System for Workstation or PC

       The IBM line of personal computers and workstations must
continue to offer higher levels of computing power at faster speeds.
Attendant with increased performance will be higher heat loads on
integrated circuit modules.  Because cooling high heat density
requires high velocity air, and noise increases with velocity,
corporate acoustic specifications effectively limit forced air
cooling and computing performance.

      The figure illustrates the invention installed and tested in an
IBM RISC System/6000* Model 520.  The liquid in the closed-loop
system absorbs heat from any high-powered module attached to
cold-plate (a), and is pumped by pump (b) through heat exchanger (c)
where the heat is rejected to the airflow produced by fan (d).  The
liquid returns to reservoir (e), and the heated air exhausts system
enclosure (f).  The heat capacity of liquids, higher than that of
air, permits high heat flux to be carried away from a module attached
to the cold-plate.  The heat exchanger's large heat transfer surface
area permits rejection of large quantities of heat with air flowing
at lower velocity than would be required for air convection cooling
the module directly.  Reduction of required air velocity gives the
desired reduction in noise.
*  Trademark of the IBM Corp.