Patent ID: 8245491

Claim:
An exhaust gas waste heat recovery heat exchanger comprising: a housing having a working fluid inlet, a working fluid outlet for dispensing a superheated vapor, an exhaust inlet, and an exhaust outlet; an exhaust flow path extending through the housing between the exhaust inlet and the exhaust outlet; and a working fluid flow path extending through the housing between the working fluid inlet and the working fluid outlet and having a first portion adjacent to the working fluid inlet and a second portion spaced apart from the working fluid inlet, a flow of working fluid along the first portion of the working fluid flow path being substantially counter to a flow of exhaust along the exhaust flow path adjacent to the first portion of the working fluid flow path, the flow of working fluid along the first portion of the working fluid flow path that is substantially counter to the flow of exhaust is located within the housing to receive heat from the flow of exhaust traveling along the exhaust flow path, the flow of working fluid along the second portion of the working fluid flow path being substantially parallel to the flow of exhaust along the exhaust flow path adjacent to the second portion of the working fluid flow path.