Publisher : The Korean Society of Mechanical Engineers
DOI : 10.3795/KSME-B.2016.40.2.069
Title & Authors
A Simulation Study for Selecting Optimum Position of a Superheater in a Waste Heat Recovery System Integrated with a Large Gasoline Engine Kim, Se Lin; Choi, Kyung Wook; Lee, Ki Hyung; Kim, Ki Bum;
Recently, automotive engineers have paid much attention to waste heat recovery technology as a possible means to improve the thermal efficiency of an automotive engine. A large displacement gasoline engine is generally a V-type engine. It is not cost effective to install two superheaters at each exhaust manifold for the heat recovery purposes. A single superheater could be installed as close to the exhaust manifold as possible for the higher recovery efficiency; however, only half of exhaust gas can be used for heat recovery. On the contrary, the exhaust temperature is decreased for the case where the superheater is installed at a junction of two exhaust tail pipes. With the fact in mind, the optimum position of a single superheater was investigated using simulation models developed from a commercial software package (i.e. AMESim). It was found that installing the superheater near the exhaust manifold could recover 3.8 kW more from the engine exhaust despite utilizing only half of the exhaust mass flow. Based on this result, the optimum layout of an automotive waste heat recovery system was developed and proposed in this paper.
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