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Title: A Study of the Theoretical Potential of Thermochemical Exhaust Heat Recuperation for Internal Combustion Engines

Abstract

We present a detailed thermodynamic analysis of thermochemical recuperation (TCR) applied to an idealized internal combustion engine with single-stage work extraction. Results for several different fuels are included. For a stoichiometric mixture of methanol and air, TCR can increase the estimated ideal engine Second Law efficiency by about 3% for constant pressure reforming and over 5% for constant volume reforming. For ethanol and isooctane the estimated Second Law efficiency increases for constant volume reforming are 9% and 11%, respectively. The Second Law efficiency improvements from TCR result primarily from the higher intrinsic exergy of the reformed fuel and pressure boost associated with gas mole increase. Reduced combustion irreversibility may also yield benefits for future implementations of combined cycle work extraction.

Authors:
 [1];  [1];  [1];  [1]
  1. ORNL
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Fuels, Engines and Emissions Research Center (FEERC); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). National Transportation Research Center (NTRC)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
OSTI Identifier:
982123
DOE Contract Number:  
DE-AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: The 2010 Technical Meeting of the Central States Section of the Combustion Institute, Champaign, IL, USA, 20100321, 20100323
Country of Publication:
United States
Language:
English
Subject:
10 SYNTHETIC FUELS; 33 ADVANCED PROPULSION SYSTEMS; AIR; COMBINED CYCLES; COMBUSTION; EFFICIENCY; ENGINES; ETHANOL; EXERGY; INTERNAL COMBUSTION ENGINES; METHANOL; MIXTURES; THERMODYNAMICS; Combustion Engine Efficiency Thermochemical Recuperation

Citation Formats

Chakravarthy, Veerathu K, Daw, C Stuart, Pihl, Josh A, and Conklin, Jim. A Study of the Theoretical Potential of Thermochemical Exhaust Heat Recuperation for Internal Combustion Engines. United States: N. p., 2010. Web.
Chakravarthy, Veerathu K, Daw, C Stuart, Pihl, Josh A, & Conklin, Jim. A Study of the Theoretical Potential of Thermochemical Exhaust Heat Recuperation for Internal Combustion Engines. United States.
Chakravarthy, Veerathu K, Daw, C Stuart, Pihl, Josh A, and Conklin, Jim. 2010. "A Study of the Theoretical Potential of Thermochemical Exhaust Heat Recuperation for Internal Combustion Engines". United States.
@article{osti_982123,
title = {A Study of the Theoretical Potential of Thermochemical Exhaust Heat Recuperation for Internal Combustion Engines},
author = {Chakravarthy, Veerathu K and Daw, C Stuart and Pihl, Josh A and Conklin, Jim},
abstractNote = {We present a detailed thermodynamic analysis of thermochemical recuperation (TCR) applied to an idealized internal combustion engine with single-stage work extraction. Results for several different fuels are included. For a stoichiometric mixture of methanol and air, TCR can increase the estimated ideal engine Second Law efficiency by about 3% for constant pressure reforming and over 5% for constant volume reforming. For ethanol and isooctane the estimated Second Law efficiency increases for constant volume reforming are 9% and 11%, respectively. The Second Law efficiency improvements from TCR result primarily from the higher intrinsic exergy of the reformed fuel and pressure boost associated with gas mole increase. Reduced combustion irreversibility may also yield benefits for future implementations of combined cycle work extraction.},
doi = {},
url = {https://www.osti.gov/biblio/982123}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Fri Jan 01 00:00:00 EST 2010},
month = {Fri Jan 01 00:00:00 EST 2010}
}

Conference:
Other availability
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