Heat exchanger with tube plates

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

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Details

F28F 21/06 (2006.01) F28D 1/053 (2006.01) F28D 7/00 (2006.01) F28F 13/06 (2006.01)

Patent

CA 2355605

A heat exchanger (51) comprising plates of thermoplastic tubes (56, 61) arranged in a way which minimizes the thermal resistance at the outer surface of the tubes (56, 61) preferably to not more than 5 times the resistance to heat transfer at the inside of the tubes (56, 61). The tubes (56, 61) are arranged in the tube plates in groups (21, 32) that can be flat or slightly wavy, such as undulating in a periodic manner, or offset with open spaces facing groups (21, 32) of tubes in alternating rows. This is done in a way that maximizes turbulence outside the tubes (56, 61) and minimizes vortices which can trap coolant in the interstices between tubes (56, 61).

L'invention concerne un échangeur thermique (51) qui comporte des plaques constituées de tubes thermoplastiques (56, 61) disposés de manière à réduire la résistance thermique à la surface extérieure des tubes (56, 61), de préférence à cinq fois au maximum la résistance au transfert thermique à l'intérieur des tubes (56, 61). Ces tubes (56, 61) sont disposés dans les plaques par groupes (21, 32) pouvant être plats ou légèrement ondulés, de façon périodique par exemple, ou encore décalés, des espaces vides faisant face aux groupes (21, 32) de tubes placés en rangs alternés. Cette disposition maximise la turbulence à l'extérieur des tubes (56, 61) et réduit à un minimum les tourbillons pouvant bloquer le liquide de refroidissement dans les interstices entre les tubes (56, 61).

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