Patent ID: 8833437
Filing Date: 2014-09-16
Classification: F22B,F28D,F28F

Abstract:
1. A heat exchanger apparatus for converting a shell-side liquid to a vapor comprising: a shell having an inner surface forming a cavity, the shell comprising an inlet for introducing the shell-side liquid into the cavity and an outlet for allowing the vapor to exit the cavity; a tube bundle comprising a plurality of tubes for carrying a tube-side fluid located in the cavity and having a longitudinal axis; a shroud circumferentially surrounding the tube bundle and positioned between the tube bundle and the inner surface of the shell so that an annular space exists between the shroud and the inner surface of the shell, wherein the shroud comprises a first plate and a second plate separated by a thermal insulating layer; an opening in a bottom portion of the shroud that forms a passageway between the annular space and the rube bundle; and an opening in a top portion of the shroud that forms a passageway between the annular space and the tube bundle.