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Hydrogen double com...
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Babayev, Rafig,1995Chalmers tekniska högskola,Chalmers University of Technology
(författare)
Hydrogen double compression-expansion engine (H2DCEE): A sustainable internal combustion engine with 60%+ brake thermal efficiency potential at 45 bar BMEP
- Artikel/kapitelEngelska2022
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Elsevier BV,2022
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LIBRIS-ID:oai:research.chalmers.se:39548bb4-ffd7-4ce0-bce4-d5674a437292
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https://research.chalmers.se/publication/530806URI
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https://doi.org/10.1016/j.enconman.2022.115698DOI
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Språk:engelska
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Sammanfattning på:engelska
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Ämneskategori:art swepub-publicationtype
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Ämneskategori:ref swepub-contenttype
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Hydrogen (H-2) internal combustion engines may represent cost-effective and quick solution to the issue of the road transport decarbonization. A major factor limiting their competitiveness relative to fuel cells (FC) is the lower efficiency. The present work aims to demonstrate the feasibility of a H-2 engine with FC-like 60%+ brake thermal efficiency (BTE) levels using a double compression-expansion engine (DCEE) concept combined with a high pressure direct injection (HPDI) nonpremixed H-2 combustion. Experimentally validated 3D CFD simulations are combined with 1D GT-Power simulations to make the predictions. Several modifications to the system design and operating conditions are systematically implemented and their effects are investigated. Addition of a catalytic burner in the combustor exhaust, insulation of the expander, dehumidification of the EGR, and removal of the intercooling yielded 1.5, 1.3, 0.8, and 0.5%-point BTE improvements, respectively. Raising the peak pressure to 300 bar via a larger compressor further improved the BTE by 1.8%-points but should be accompanied with a higher injector-cylinder differential pressure. The lambda of ~1.4 gave the optimum tradeoff between the mechanical and combustion efficiencies. A peak BTE of 60.3% is reported with H2DCEE, which is ~5%-points higher than the best diesel-fueled DCEE alternative.
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Im, Hong G.King Abdullah University of Science and Technology (KAUST)
(författare)
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Andersson, ArneVolvo Group
(författare)
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Johansson, Bengt,1963Chalmers tekniska högskola,Chalmers University of Technology(Swepub:cth)bengtj
(författare)
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Chalmers tekniska högskolaKing Abdullah University of Science and Technology (KAUST)
(creator_code:org_t)
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Ingår i:Energy Conversion and Management: Elsevier BV2640196-8904
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