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Method for an efficient cold-plate design with uniformly distributed liquid flow

IP.com Disclosure Number: IPCOM000006849D
Publication Date: 2002-Feb-06
Document File: 4 page(s) / 189K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method for an efficient cold-plate design with uniformly distributed liquid flow. Benefits include improved thermal performance.

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Method for an efficient cold-plate design with uniformly distributed liquid flow

Disclosed is a method for an efficient cold-plate design with uniformly distributed liquid flow. Benefits include improved thermal performance.

Background

   The power dissipation of CPUs keeps increasing from generation to generation. When the average power density goes beyond 100 W/cm2, conventional air-cooling technology is not sufficient to maintain the CPU within the acceptable operating temperature range.

              The conventional solution is to implement liquid-cooling technology (see Figure 1). The input liquid is divided into several flow channels. However, the liquid flow is not uniformly distributed among the flow channels because of the lack of a flow divider. Because most of the liquid flows through the area , the heat fins in area  are not fully utilized.

              In a slightly different implementation (see Figure 2), the lengthy channel and the sudden channel turns (180 degrees) significantly increase the pressure drop and reduce the available liquid flow. Because the liquid in area  is warmer than that in area , the heat fins in area  are less efficient.

              Space limitations inside the computer chassis prevent the implementation of some cooling solutions.

General description

    The disclosed method includes a cold-plate design that utilizes swirl-shaped heat fins to form separate flow channels. This cold-plate design enables liquid flow to be uniformly distributed among each flow channel so that each fin can be fully effective for heat convection. Because the cold liquid impinges right on the center of the cold plate that is typically the hot spot of the electronic device, cooling efficiency is significantly increased.

   The key element is a cold plate made of Cu or highly conductive thermal materials. The thick base of the cold plate forms an effective heat spreader. Inside the cold plate, swirl-shaped heat fins separate flow channels for efficient heat convection. A cone-shape liquid flow divider smoothes flow direction changes. The liquid-flow chamber is off-center from the swirl-shaped heat fins so that the backpressure of each flow channel is well balanced. The result is uniformly distributed liquid flow within each channel.

Advantages

              The disclosed method provides several advantages, including:

•             The disclosed cold plate uniformly distributes the liquid flow within each flow channel.

•             For the new invented cold plate, the cold liquid impinges right on the center of the cold plate that typically corresponds to the hot spot of the device requiring cooling.

•             The swirl-shaped heat fins increase the flow channel length and contact area for more efficient heat convection.

•             The cone-shape flow divider reduces the liquid pressure head (loss) when the cold liquid...