Patent ID: 7578179

Claim:
A temperature control unit for use with an exhaust gas simulation system, the exhaust gas simulation system having a main exhaust line downstream a combustive burner, comprising: a chamber for receiving exhaust from the main exhaust line, the chamber having a first port for delivering exhaust to a hot path and a second port for delivering exhaust to a cold path; wherein the first port and the second port are arranged within the chamber so that the flow of exhaust into the hot path is orthogonal to the flow of exhaust into the cold path; a heat exchanger for receiving exhaust via the second port, for cooling the exhaust along the cold path, and for delivering cooled exhaust to a cold path outlet line, and a hot path line across the bottom of the chamber and located under the heat exchanger; wherein the cold path outlet line joins the hot path line at an exhaust juncture downstream the control valve and downstream the heat exchanger.