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Compartmentalized, Hybrid Air-Cooled/Refrigeration Cooling System

IP.com Disclosure Number: IPCOM000190112D
Original Publication Date: 2009-Nov-17
Included in the Prior Art Database: 2009-Nov-17
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Abstract

This disclosure outlines a compartmentalized, hybrid air-cooled/refrigeration system that will eliminate the potential for condensation to form on electronic components in a low temperature electronic packaging system.

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Compartmentalized, Hybrid Air-Cooled/Refrigeration Cooling System

A generalized schematic of the system can be seen in the figure. Two subsystems: circulated air and refrigeration, are coupled together. The refrigeration subsystem 101 outlined here is that of a standard vapor compression cycle (it should be noted that any thermodynamic cycle that moves heat from a low temperature reservoir to a high temperature reservoir can be adapted to this hybrid system). The compressor 102 and condenser 103 (and other supporting components) are housed separately from the expander/evaporator 104. In this configuration the expander/evaporator also serves as the heat exchanger for the closed-loop, circulated air subsystem 105. The air moving device 106 (i.e. a blower) processor module heat sink 107, and memory card heat sinks 108 make up the rest of the air subsystem. Vital to the operation of the air subsystem is the low temperature compartment 109. It serves two major functions: (1) it thermally insulates the low temperature air from the surroundings, and (2) it minimizes the influx of moisture into the circulating air.

    Basic operation of the hybrid system is as follows. Air is forced over/through the heat sinks where it removes the dissipated heat. It then passes through the evaporator and transfers the collected heat to the refrigeration subsystem. Ultimately the heat is rejected to the surroundings via the condenser.

    To understand how condensation is prevented from forming on the electronics, one must first understand what happens thermodynamically to the air within the low temperature compartment as the system is initially started, or when starting up after the low temperature compartment has been opened. Before the refrigeration unit is started the air has a relative humidity and dew point temperature comme...