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Preliminary Specification for a Closed Loop Liquid Cooling System Product Reliability Test Plan
Keywords: product reliability, liquid cooling, test plan
Liquid cooling is once again being considered to counter the increasing power densities in high performance CPUs. Reliability for high performance servers calls for components and systems to have a seven year L10 lifetime in the field. To assist suppliers and vendors engaged in the development and marketing of these systems , we have prepared a preliminary reliability specification for closed loop liquid cooling to the board. In the creation of this document, we have sought input from industry leaders, suppliers, and users. We are bringing this preliminary specification to the wider thermal community to get additional feedback on whether these requirements, which address the design, reliability, lifetime, and UL certification, are within the range of what can be delivered from current technology and products. In particular, we are soliciting further information and data on testing procedures and analysis in addressing the required product life, i.e., less than 10% degradation in thermal performance over the 7 year lifetime of the product. It is extremely important to understand how a system has been engineered by the system/end item supplier to address these reliability concerns. In particular, product reliability and stability in the field are deemed of utmost significance. We especially sought to ensure that the reliability testing under adverse conditions would capture potential failure modes resulting in degradation of thermal performance, without, a priori specification of the specific mode of component or system degradation. We are soliciting industry responses and opinion on whether we have captured, in this document, the component and system tests that will demonstrate this capability, i.e., how best to test the products to failure and the end of life results.
Margaret Stern, Senior Staff Engineer
Sun Microsystems
Ashburn, VA
USA


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