Refrigeration – Structural installation – With electrical component cooling
Reexamination Certificate
2002-06-28
2003-10-28
Bennett, Henry (Department: 3744)
Refrigeration
Structural installation
With electrical component cooling
C165S080200
Reexamination Certificate
active
06637231
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a refrigeration system for cooling electrical components. More particularly, the invention relates to a field and/or customer replaceable refrigeration module that is suitable for use in standard electronic component environments.
BACKGROUND OF THE INVENTION
Electronic components, such as microprocessors and other various integrated circuits, have advanced in at least two significant ways. First, feature sizes have moved into the sub-micron range thereby allowing larger numbers of transistors to be formed on a given surface area. This in turn has resulted in greater device and circuit density on the individual chips. Second, in part due to the first advance discussed above, microprocessors have increased dramatically in clock speed. At present microprocessor speeds of 2.5 Gigahertz are coming to market and the 3 and 4 Gigahertz range is rapidly being approached.
As a result of the advances in device density and microprocessor speed discussed above, heat dissipation, which has always been a problem in the past, is rapidly becoming the limiting factor in microprocessor performance. In addition, the market for electronic devices currently demands smaller and smaller devices with more capabilities and longer battery, or remote/mobile location, operational capability. Consequently, heat dissipation and cooling is now the foremost concern and the major obstacle faced by system designers.
As noted, heat dissipation has long been recognized as a serious problem limiting the performance of electronic components and systems. In the past, the solutions to the heat dissipation problem have been mostly limited to air-based cooling systems, with only the most exotic military, scientific and custom electronic systems employing the bulky and costly prior art liquid-based cooling solutions.
In the prior art, air-based cooling systems, such as heat sinks, cooling fins, heat pipes and fans, have been the systems of choice for several reasons. First, the air-based cooling systems of the prior art were modular and self-contained and were therefore field replaceable with minimal effort using standard tools. Second, the prior art air-based cooling systems attached directly to the components that needed cooling and a discrete cooling unit could be provided for each heat source. In addition, air-based cooling systems were compact and simple in both operation and installation, with minimal parts to fail or break and minimal added system complexity. Therefore, prior art air-based cooling systems were reliable. In addition, and probably most importantly, in the prior art, air-based cooling systems could reasonably meet the cooling needs of electronic devices and systems so there was little motivation to move to the more complex and problematic liquid-based systems. However, as noted above, due to the advances in microprocessor speeds and device density, air-based cooling systems will most likely not be a viable option for electronic device cooling for the next generation of microprocessors.
As noted above, another possible prior art cooling system that could potentially provide the level of cooling required by the next generation of microprocessors is liquid-based cooling systems. Prior art liquid-based cooling systems typically used a refrigerant, such as R134, that was circulated by a compressor. In prior art liquid-based cooling systems the compressor was typically a crankshaft reciprocating compressor or a rotary compressor similar to those used in home refrigerators.
As noted above, prior art liquid-based cooling systems have far more potential cooling capability than air-based systems. However, in the prior art liquid-based cooling systems, the crankshaft reciprocating or rotary compressors were typically, by electronics industry standards, very large, on the order of tens of inches in diameter, very heavy, on the order of pounds, and often required more power to operate than the entire electronic system they would be charged with cooling. In addition, the size and design of prior art liquid-based cooling systems often required that the major components of the prior art liquid-based cooling system be centrally located, typically remote from the electronic devices to be cooled, and that a complicated system of tubing or “plumbing” be used to bring the cooling liquid into thermal contact with the heat source, i.e., with the microprocessor or other integrated circuit. Consequently, unlike prior art air-based cooling systems, prior art liquid-based cooling systems were not modular, were not self-contained, and often required special expertise and tools for maintenance and operation. In addition, unlike the prior art air-based cooling systems discussed above, prior art liquid-based cooling systems did not attach directly to the components that needed cooling and a discrete cooling unit typically could not be provided for each heat source. Also, unlike the prior art air-based cooling systems discussed above, prior art liquid-based cooling systems were not compact and were not simple in either operation or installation. Indeed, prior art liquid-based cooling systems typically included numerous parts which could potentially fail or break. This added complexity, and threat of component failure, was particularly problematic with respect to the associated plumbing discussed above because a failure of any of the tubes could result in the introduction of liquid refrigerant into, or onto, the electronic devices and could cause catastrophic system failure.
In addition, prior art liquid-based cooling systems employed compressors that typically were highly orientation dependent, i.e., they could not operate at angles of more than 30 or 40 degrees. Consequently, prior art liquid based cooling systems were particularly ill suited for the electronics industry that stresses flexibility and often requires orientation independent operation.
Given that, as discussed above, air-based cooling systems have reached their operational limits when it comes to cooling electronic components, there is a growing realization that some other form of cooling system, such as liquid-based cooling systems will need to be adopted by the electronics industry. However, as discussed above, prior art liquid-based cooling systems are far from ideal and, thus far, the industry has not adopted liquid-based cooling in any meaningful way because the problems associated with prior art liquid-based cooling systems are still thought to outweigh the advantages these systems provide in terms of increased cooling capacity.
What is needed is a cooling system that has the cooling capacity of a liquid-based cooling system yet has the advantages of being modular, simple, and compact like air-based cooling systems.
SUMMARY OF THE INVENTION
The present invention is directed to a field and/or customer replaceable packaged refrigeration heat sink module that is suitable for use in standard electronic component environments. According to the present invention, advances in compressor technology are incorporated in a field replaceable packaged refrigeration heat sink module to be used for cooling electronic components. The field replaceable packaged refrigeration heat sink module is self-contained and is specifically designed to have physical dimensions similar to those of a standard air-based cooling system, such as a fined heat sink or heat pipe. As a result, the present invention can be utilized in existing electronic systems without the need for board or cabinet/rack modification or the “plumbing” associated with prior art liquid-based cooling systems. Indeed, unlike prior art liquid-based cooling systems, the various parts of the field replaceable packaged refrigeration heat sink module of the invention, including the very minimal tubing, are self-contained in the field replaceable packaged refrigeration heat sink module and therefore a failure of any of the tubes would typically not result in the introduction of liquid into, or onto, the electronic devices and would not cause catastrophic system failure
Bennett Henry
Drake Malik
Gunnison McKay & Hodgson, L.L.P.
McKay Philip J.
Sun Microsystems Inc.
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