Thesis proposal Master Energie Nr : 18 Graduation year : 2010 - 2011
نویسنده
چکیده
Description Background – In recent times there is a notable increase in research towards compact, high heat flux, dedicated cooling solutions for electronic systems. This is due to an ever increasing power density of these electronic components that needs to be dissipated. Conventional cooling using finned heat sinks with air is inadequate to keep up with these increasingly stringent cooling demands. Convective liquid cooling using micro-channel heat sinks in single-or two-phase operation is envisaged as two possible cooling solutions for next generation electronics. Historically two-phase boiling heat transfer has been used to cool large mainframe computers. Because of the stationary nature of these cooling systems, size limitations on the various cooling system components are not very stringent. However designing a two-phase cooling system for a portable application (desktop or laptop computer) does impose strong size limitations (especially for a highly mobile laptop application). A recent study [1] has shown that the total two-phase volume in the system has a large influence on the size limitations of a two-phase cooling system. In general a small two-phase volume is preferable to a larger volume. An important contribution of the two-phase volume in a cooling system is situated in the condenser. Therefore the condenser needs to be compact but also highly efficient at the same time in order to minimize the two-phase volume of the system. A design incorporating multiple small heat exchangers could prove to be superior to a single large heat exchanger. Examples of small two-phase heat exchangers can be found in [2] and [3]. Feasibility of the heat exchanger is also an important aspect, therefore the heat exchanger should be constructible using existing manufacturing techniques. Aims – This project aim to design a compact and efficient heat exchanger for a portable two-phase microchannel electronics cooling system. System designs using multiple heat
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