Heat exchanger partic. for fluorocarbon evaporative cooling - runs refrigerant through internally channelled tube inside secondary fluid outer tube

摘要

A heat exchanger is an outer tube contg. an inner tube which has longitudinal channels with intermediate sepg. ribs formed in its internal surface. The channels and ribs are coaxial and all have similar dimensions, the channel width and depth both being between 0.7 mm and 1.0 mm. The outer tube pref. contains three inner tubes on parallel axes passing through the corners of an equilateral triangle. Each inner tube can be externally sleeved with a security tube which is close fitting on the inner tube and has shallow longitudinal grooves cut into its internal surface. The security tube grooves are pref. directed into a collecting manifold which is piped to a leak sensor. Heat exchange between two fluids, one of which flows through a tube surrounding an inner tube which conveys the other fluid. In partic. the inner tube is designed for the evapn. of a fluorocarbon which refrigerates a secondary fluid surrounding the inner tube. Highly efficient heat transfer. The shallow channels of the inner tube promote intensive evapn. over an extensive transfer surface area.