Waste heat recovery using shell and tube heat exchanger from the exhaust of an automotive engine
Date
2010
Authors
Rubaiyat, S.N.H.
Bari, S.
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Conference paper
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Proceedings of the 13th Asian Congress of Fluid Mechanics (13ACFM), 2010
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13th Asian Congress of Fluid Mechanics (13ACFM) (17 Dec 2010 - 21 Dec 2010 : Dhaka, Bangladesh)
Abstract
In this research, experiments were conducted to measure the exhaust waste heat available from a 60 kW automobile engine. The performance of an available shell and tube heat exchanger using water as the working fluid was conducted. With the available data, computer simulation was carried out to improve the design of the heat exchanger. Two heat exchangers were used: one to generate saturated and the other to generate super heated vapours. These two heat exchangers can be arranged in parallel or series. In series arrangement, the exhaust gas was first passed through superheated heat exchanger and then through the saturated heat exchanger. Whereas, in parallel arrangement, the exhaust gas was divided to pass through saturated and superheated heat exchangers. In both cases, water was passed first through saturated heat exchanger and then through superheated heat exchanger. Interestingly, it is found that higher power output can be achieved for parallel arrangement below 30 bar working pressure whereas series arrangement can achieve higher power output above 30 bar working pressure. The power output from the turbine is also estimated assuming actual turbine efficiency. It is found that with the exhaust heat available from the diesel engine at least 18% additional power can be achieved.
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Copyright 2010 Bangladesh Society of Mechanical Engineers