Patent ID: 8495859

Claim:
An exhaust gas waste heat recovery heat exchanger comprising: a housing having a first working fluid inlet, a second working fluid inlet, a first working fluid outlet, a second working fluid outlet for dispensing a superheated vapor, an exhaust inlet, an exhaust outlet, a preheater, and a superheater; an exhaust flow path extending between the exhaust inlet and the exhaust outlet through the preheater and the superheater; and a working fluid flow path extending through the housing between the first working fluid inlet and the second working fluid outlet, the working fluid flow path including, a first portion that extends through the preheater from the first working fluid inlet to the first working fluid outlet, a flow of working fluid along the first portion of the working fluid flow path through the preheater receiving heat from the flow of exhaust traveling along the exhaust flow path, and a second portion that extends through the superheater from the second working fluid inlet to the second working fluid outlet and spaced apart from the first working fluid inlet, the flow of working fluid along the second portion of the working fluid flow path through the superheater receiving heat from the flow of exhaust traveling along the exhaust flow path; wherein the preheater and the superheater are integrally formed and enclosed within the housing such that each defines a section of a single heat exchanger; wherein the housing includes a wall extending from the exhaust inlet to the exhaust outlet, wherein heat transfer between the flow of exhaust and the flow of working fluid occurs through the wall, and wherein the exhaust inlet is located at a first end of the housing and the exhaust outlet is located at a second end of the housing opposite from the first end.