Study On Low Energy Heat Control Unit Based On Nano Composite

In order to improve the thermal characteristic of ultra-precision processing system, heat control units are used to control the heat transfer between functional components and optimize the heat flow field of the system, so that the temperature field of the system is optimized indirectly. Current heat control units are mainly divided into two kinds:passive unit and active unit. Passive unit is low energy consumption but less controlled. Active unit has good control accuracy but high energy consumption, and its thermal coupling effect is obvious. Combing with Specialized Research Fund for the Doctoral Project (NO.200803350028) and National Key Scientific and Technology Program (NO.2009ZX04014-026-04), design and control strategy of heat control unit have been improved. First, heat conductor was designed based on anisotropy composite, so that heat circuit was optimized. Second, multistage semi-active control strategy was used. Including:Chapter 1:Developing situation and application prospect of CNTs composite were introduced. Heat conductivity of CNTs composite was analyzed and heat-conducting models of composites were summarized. Research achievement and existing problems of heat control units used in ultra-precision processing system were represented. At the end, the significance, content and structure of this study were presented.Chapter 2:Working principle and structure of low energy heat control unit were presented. Basic theory and modeling strategy of thermal network were introduced. At the end, virtual prototype of the unit was established based on thermal network.Chapter 3:Developing situation and application of temperature measurement device based on thermal couple were introduced and experiment strategy of low energy heat control unit was represented. Virtual prototype was corrected by modifying corresponding parameter according to the experiment data.Chapter 4:Control performance enhancement and energy reduction were proved by comparing with active heat control unit. In order to lay foundations for the control strategy, influences to the control performance caused by key parameter was included.Chapter.5:Multistage semi-active control strategy with heat transfer coefficient as the key parameter was introduced. Control strategy was simulated and proved to be effective by corresponding experiments.Chapter 6:Study ideas were reviewed and results were summarized. The prospect was also presented for further study.