Optimization of Refrigeration Systems for High-Heat-Flux Microelectronics

Optimization of Refrigeration Systems for High-Heat-Flux Microelectronics

TitleOptimization of Refrigeration Systems for High-Heat-Flux Microelectronics
Publication TypeConference Paper
Year of Publication2008
AuthorsPatrick E Phelan, Y Gupta, H Tyagi, Ravi S Prasher, J Cattano, G Michna, R Zhou, J Wen, Michael K Jensen, Y Peles
Conference NameASME 2008 International Mechanical Engineering Congress and Exposition
Date Published11/2008
PublisherAmerican Society of Mechanical Engineers
Keywordsheat, Microelectronic devices, optimization, Refrigeration
Abstract

Increasingly, military and civilian applications of electronics require extremely high heat fluxes, on the order of 1000 W/cm2 . Thermal management solutions for these severe operating conditions are subject to a number of constraints, including energy consumption, controllability, and the volume or size of the package. Calculations indicate that the only possible approach to meeting this heat flux condition, while maintaining the chip temperature below 50 °C, is to utilize refrigeration. Here we report an initial optimization of the refrigeration system design. Because the outlet quality of the fluid leaving the evaporator must be held to approximately less than 20%, in order to avoid reaching critical heat flux, the refrigeration system design is dramatically different from typical configurations for household applications. In short, a simple vapor-compression cycle will require excessive energy consumption, largely because of the superheat required to return the refrigerant to its vapor state before the compressor inlet. A better design is determined to be a “two-loop” cycle, in which the vapor-compression loop is coupled thermally to a primary loop that directly cools the high-heat-flux chip.

DOI10.1115/IMECE2008-69113