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Reducing Heat Exchanger Air Exit Temperatures

IP.com Disclosure Number: IPCOM000029139D
Publication Date: 2004-Jun-16
Document File: 3 page(s) / 19K

Publishing Venue

The IP.com Prior Art Database

Abstract

Disclosed is a method that brings ambient air into the air flow leaving a heat exchanger in order to cool the exiting air stream. Benefits include a solution that does not increase cost or space and power requirements.

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Reducing Heat Exchanger Air Exit Temperatures

Disclosed is a method that brings ambient air into the air flow leaving a heat exchanger in order to cool the exiting air stream. Benefits include a solution that does not increase cost or space and power requirements.

Background

As the amount of power dissipated from computing devices (e.g. a notebook computer) increases, the amount of energy transferred to the air exiting the fan increases.  As a result, the exit air temperature of the heat exchanger reaches higher values. Exit air temperature is limited to prevent discomfort or injury to the user, and to comply with relevant standards. Currently, in order to reduce this temperature the designer uses a higher-capacity fan, or a second fan.

A standard thermal solution for cooling is to use a remote heat exchanger coupled with a fan (see Figure 1). The fan blows air across the heat exchanger, which transfers energy from the heat exchanger into the air.  As a result of this energy transfer, the temperature of the air is increased. However, these solutions may not be viable due to space, cost, or power requirements. 

General Description

The disclosed method brings ambient air into the air flow leaving the heat exchanger in order to cool the exit air stream.  The air exiting the heat exchanger flows into a converging nozzle to accelerate the flow; when the flow leaves the nozzle as a jet, it entrains air (see Figure 2). The source of this air is from outside the computing device...