Performance and reliability of exhaust gas waste heat recovery units
Koh, Chuan Heng Erik
Sathe, Sanjeev B.
Millsaps, Knox T.
MetadataShow full item record
This thesis presents the effect of exhaust tube length-to-diameter (L/d) ratio, jacket-to-tube diameter (D/d) ratio, coolant inlet and outlet placements, exhaust gas swirling conditions, and tube materials (steel, copper, Inconel, and ceramic) on heat recovery performance, exhaust side pressure drop, and temperature profile in the exhaust gas Waste Heat Recovery Unit (WHRU). Non-dimensional parametric studies of a selected counter-flow Water Jacket WHRU was conducted using analytical and Computational Fluid Dynamic (CFD) models. Exhaust gas Reynolds numbers between 20,000 and 400,000, representative of exhaust gas flow in the exhaust stacks of U.S.Marine Corps’ MEP803A diesel generators and the U.S.Navy's 501-K17 gas turbine generators, were used. Results indicate heat recovery increases with higher L/d, D/d, and swirling exhaust gases conditions but with a severe pressure drop penalty. Addition of a solid heat spreader at the exhaust gas inlet and the use of suitable tube materials were also found to influence temperature profiles in the WHRU and mitigate adverse temperature gradients to some extent without any additional pressure drop penalty. Optimal laterally shifted placement of coolant inlet and outlet was found to improve heat recovery by up to 19% and was very effective at mitigating adverse temperature profiles, which improves the reliability of exhaust gas WHRU.
Approved for public release; distribution is unlimited
Showing items related by title, author, creator and subject.
Bohning, Ryan S. (Monterey, California: Naval Postgraduate School, 2015-06);The Secretary of the Navy has ordered the U.S. Navy and Marine Corps to reduce energy usage. This study explores how to optimize placement and size of a non-intrusive waste heat recovery device for energy recovery in exhaust ...
VanDenBerg, Aaron R. (Monterey, California: Naval Postgraduate School, 2016-12);The purpose of this thesis was to design and demonstrate the effectiveness of a new style of heat exchanger for waste heat recovery. The new design sought to optimize heat recovery from a gas turbine engine exhaust as well ...
Calvert, Willard; Cohn, Rachel; Goodman, Gail; Heidt, Brian; Lojek, Joseph; Malecki, Sarah; Powell, Brian (Monterey, California. Naval Postgraduate School, 2011-06); NPS-SE-11-006Submarines offer a capability to deploy and retrieve unmanned undersea vehicles (UUV) in littoral and blue water Areas of Operation while avoiding detection. Integration of the submarine and UUV through a launch and recovery ...