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Waste heat recovery from adiabatic diesel engines by exhaust-driven Brayton cyclesAn evaluation of Bryton Bottoming Systems (BBS) as waste heat recovery devices for future adiabatic diesel engines in heavy duty trucks is presented. Parametric studies were performed to evaluate the influence of external and internal design parameters on BBS performance. Conceptual design and trade-off studies were undertaken to estimate the optimum configuration, size, and cost of major hardware components. The potential annual fuel savings of long-haul trucks equipped with BBS were estimated. The addition of a BBS to a turbocharged, nonaftercooled adiabatic engine would improve fuel economy by as much as 12%. In comparison with an aftercooled, turbocompound engine, the BBS-equipped turbocharged engine would offer a 4.4% fuel economy advantage. If installed in tandem with an aftercooled turbocompound engine, the BBS could effect a 7.2% fuel economy improvement. The cost of a mass-produced 38 Bhp BBS is estimated at about $6460 or 170/Bhp. Technical and economic barriers that hinder the commercial introduction of bottoming systems were identified. Related studies in the area of waste heat recovery from adiabatic diesel engines and NASA-CR-168255 (Steam Rankine) and CR-168256 (Organic Rankine).
Document ID
19840024237
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Khalifa, H. E.
(United Technologies Research Center East Hartford, CT, United States)
Date Acquired
September 4, 2013
Publication Date
December 1, 1983
Subject Category
Urban Technology And Transportation
Report/Patent Number
NAS 1.26:168257
NASA-CR-168257
DOE/NASA/0304-1
Accession Number
84N32307
Funding Number(s)
CONTRACT_GRANT: DEN3-304
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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