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Numerical study of an exhaust heat recovery system using corrugated tubes and twisted tape inserts

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dc.contributor.author Mokkapati, Vamsi Krishna Sarma
dc.date.accessioned 2015-01-08T22:56:10Z
dc.date.available 2015-01-08T22:56:10Z
dc.date.issued 2014-12
dc.identifier.uri http://hdl.handle.net/11122/4793
dc.description Thesis (M.S.) University of Alaska Fairbanks, 2014
dc.description.abstract Diesel engine generators are the major power source for small communities in cold regions. Diesel generators waste about 1/3 of their fuel energy in the form of heat through exhaust gas. The primary goal of this work is to capture part of the heat from the exhaust and improve the efficiency of the system. A gas to liquid heat transfer performance of a concentric tube heat exchanger with corrugated tubes and twisted tape inserts is investigated by considering its effects on engine performance and economics. This type of heat exchanger is expected to be inexpensive to install and effective in heat transfer, with minimal effect on exhaust emissions of diesel engines. Most previous research has investigated liquid to liquid heat transfer in corrugated tubes at low Reynolds, not gas to liquid heat transfer. The SolidWorks Flow Simulation computer program was used to perform these studies. The program is first validated by comparing simulation results with renowned correlations and field measurements. Simulations are then conducted for a concentric tube heat exchanger with corrugated tubes and twisted tapes of different configurations to determine the optimal design. The maximum enhancement in the rate of heat transfer was found in an annularly corrugated tube heat exchanger with twisted tape inserts. This exchanger transfers about 235.3% and 67.26 % more heat compared to plain tube and annularly corrugated tube heat exchangers without twisted tapes, respectively. Based on optimal results, for a 120 kWe diesel generator, the application of an annularly corrugated tube heat exchanger with twisted tape inserts can save 2,250 gallons of fuel annually (a cost of approximately $11,330) expected payback of initial cost in one month. In addition, saving heating fuel also reduces CO₂ emissions by 23 metric tons per year. en_US
dc.language.iso en_US en_US
dc.title Numerical study of an exhaust heat recovery system using corrugated tubes and twisted tape inserts en_US
dc.type Thesis en_US
dc.type.degree ms en_US
dc.identifier.department Department of Mechanical Engineering en_US
dc.contributor.chair Peterson, Rorik
dc.contributor.committee Das, Debendra
dc.contributor.committee Kim, Sun Woo
dc.contributor.committee Lin, Chuen-Sen


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