Patent ID: 7380403
Filing Date: 2008-06-03
Classification: F25C,F28F

Abstract:
1. A heat exchange device for exchanging heat between a refrigerant fluid and a fluid to be cooled to a solidification limit, the heat exchange device including: a first fluid flow circuit containing the refrigerant fluid; a second fluid flow circuit containing the fluid to be cooled to the solidification limit and independent of the first fluid flow circuit; at least one heat exchange wall disposed between the first and second fluid flow circuits, the heat exchange wall having a first, cold surface in contact with the refrigerant fluid, and an opposite, hot surface in contact with the fluid to be cooled; and at least one mechanical system to prevent deposition on the hot surface of a solid layer of the fluid to be cooled, the mechanical system comprising a friction means having a planar surface extending parallel to the hot surface, means for supporting the friction means constructed and arranged such that the planar surface is in frictional contact with the hot surface, and means for displacing the friction means in rotation relative to the hot surface to scrape the hot surface, wherein the planar surface has a width between 30 and 120 mm, and the hot surface and the friction means have heat conductivities in a ratio of the heat conductivity of the hot surface to the heat conductivity of the friction means of at least 3.