Experimental Results of a Waste Heat Recovery System with ... · Experimental Results – MFB....
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ORC 2019 Conference Experimental Results of a Waste Heat Recovery System with Ethanol using the Exhaust Gases of a Light-Duty Engine Jelmer Rijpkema, Sven B. Andersson, Karin Munch Chalmers University of Technology Fredrik Ekström, Volvo Car Corporation Athens, 2019-09-11 [email protected]
Transcript of Experimental Results of a Waste Heat Recovery System with ... · Experimental Results – MFB....
ORC 2019 Conference
Experimental Results of a Waste Heat Recovery System with Ethanol using the Exhaust Gases of a Light-Duty Engine
Jelmer Rijpkema, Sven B. Andersson, Karin MunchChalmers University of Technology
Fredrik Ekström, Volvo Car Corporation
Athens, [email protected]
• CO2 emissions Engine efficiency• Engine efficiency Heat loss• Heat loss WHR
• Excellent addition to hybridization• City driving vs. high-way driving
Why ORC for WHR in a passenger car?
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© autoevolution.com
• Published experimental results• Integrated system
• Compact design considering vehicle packaging
• Automatic control• Difference with other systems
• Clutch• Two evaporators
• Design methodology• Ekström, F., et al. (2019), A Mild Hybrid SIDI Turbo Passenger Car Engine
with Rankine Waste Heat Recovery, SAE Technical Paper 2019-24-0194
Why this research?
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© volvocars.com
• Experimental setup• Control strategy• Main results• Conclusions
Outline
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Experimental Setup
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Experimental Setup
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Ethanol
Control Strategy
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• Mechanical Feedback (MFB)• Expander connected to
engine• Pump speed to control
expander inlet temp.• Expander speed =
1.5 * engine speed• Bypass valve position to
control system pressure
Control Strategy
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• Electrical Feedback (EFB)• Expander connected to
generator• Pump speed to control
expander inlet temp.• Expander speed to control
system pressure• EFB MFB
• Synchronize expander speed to 1.5 * engine speed
Conditions and Constraints
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Experimental Results – Engine
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• Engine speed• 1750 – 2500 RPM• Increments of 250 RPM
• Engine torque• 100 – 225 Nm• Increments of 25 Nm
• 16 experimental points
Experimental Results – Exhaust
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Experimental Results – MFB
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𝜂𝜂tot,mfb =�̇�𝑊exp,mfb
�̇�𝑄tot=
�̇�𝑊exp,mfb�̇�𝑚𝑒𝑒𝑒𝑒𝑒 ℎexh,ev1,in − ℎexh,amb
Experimental Results – EFB
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𝜂𝜂tot,efb =�̇�𝑊sh,gen�̇�𝑄tot
No electrical losses
Experimental Results – EFB
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• MFB expander power• 0.5 – 2.5 kW• BSFC reduction: 4 – 12 g/kWh (1 – 5.5 %)• Excluding pump losses
• EFB expander power• 0.5 – 2.5 kW• Excluding pump and electrical losses
• Excellent for combining with hybrid system with fuel savings up to 5.5% at high-way driving conditions
• System design and control concept allow for integration in car
Conclusions
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Volvo Cars
Thank you
