Method for making brazed heat exchanger and apparatus

F - Mech Eng,Light,Heat,Weapons – 28 – F

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F28F 13/18 (2006.01) F28D 9/00 (2006.01)

Patent

CA 2526221

Disclosed is a heat exchanger comprising a boiling passage and cooling passage defined by opposite sides of metal walls. Layers of brazing material between the metal walls and a spacer member bond components of the heat exchanger together. An enhanced boiling layer (EBL) comprising metal particles bonded to each other and to a boiling side of the metal wall provides nucleate boiling pores to improve heat transfer. The EBL has a melting temperature that is higher than the melting temperature of the brazing material. Also disclosed is a process for assembling the heat exchanger.

L'invention porte sur un échangeur thermique comprenant un passage d'ébullition et un passage de refroidissement définis par les côtés opposés des parois métalliques. Les couches du matériau de brasage entre les parois métalliques et un espaceur relient les composants de l'échangeur thermique. Une couche d'ébullition améliorée comprenant des particules métalliques collées les unes aux autres et à un côté ébullition de la paroi métallique forment des pores d'ébullition nucléée pour améliorer le transfert de chaleur. La couche d'ébullition améliorée a une température de fusion supérieure à celle du matériau de brasage. L'invention porte également sur un procédé d'assemblage de l'échangeur thermique.

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