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Thermodynamic and statistical analysis on the effect of exhaust gas recirculation on waste heat recovery from homogeneous charge compression ignition engines

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Abstract

Combined heat and power systems based on internal combustion engines have been widely used in last decades. Optimization of internal combustion engines from the standpoint of availability is a significant issue in cogeneration systems. Despite the noticeable advantages of homogeneous charge compression ignition engines such as high fuel efficiency and low particulate matters and nitrogen oxides emissions, controlling of ignition timing is a major concern in these engines. Utilizing exhaust gas recirculation technology is a method to control ignition timing in homogeneous charge compression ignition engines. The main objective of the present study work is to investigate the effect of exhaust gas recirculation technology on waste heat recovery from homogeneous charge compression ignition engines. A validated multi-zone combustion model is used for simulation of homogeneous charge compression ignition engine and availability analysis. Model is coupled with a semi-detailed chemical kinetics mechanism to predict the combustion species and reactions. Methane is used as engine fuel and study is conducted with different proportions of exhaust gases between 0 and 40 percent. The results show that lower contents of exhaust gas (10% or 20%) lead to higher recoverable energy form exhaust gases of engine. Engine output works increase by exhaust gas addition and cyclic irreversibility decrease. Exhaust gas addition results in higher efficiencies of first and second law and improves the utilization factor of the fuel chemical energy. Statistical analysis show that exhaust gas effects on recoverable waste heat from engine exhaust gases and utilization factor is significantly meaningful.

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Abbreviations

A :

Area (m2)

A R :

Effective flow area (m2)

c v :

Specific heat constant at constant volume (J kg−1 K−1)

C D :

Discharge coefficient

H :

Enthalpy (Jkg−1)

h :

Convection heat transfer coefficient (J m−2 s−1 K−1)

k :

Thermal conductivity (J m−1 s−1 K)

m :

Mass (kg)

MW:

Molecular weight

n s :

Number of species

P :

Pressure (Pa)

Q :

Heat (J)

R u :

Universal ideal gas constant (J mol−1 K−1)

T :

Temperature (K)

t :

Time (s)

U :

Internal energy (J)

u :

Specific internal energy (J kg−1)

V :

Volume (m3)

v :

Stoichiometric constant of each species in each reaction

W :

Work (J)

Y :

Mass fraction

z :

Direction (m)

γ :

Ratio of specific heats

θ :

Crank angle position (Degree)

ρ :

Density (kg m−3)

\({\dot{\omega }}\) :

Molar rate of production (molm−3 s−1)

BL:

Boundary layer

cond:

Conductive heat transfer

conv:

Convective heat transfer

d:

Downstream

i :

ith zone

j :

jth species

k :

kth reaction

r:

Reference condition, IVC

tran:

Transferred

u:

Upstream

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Acknowledgements

The authors thank gratefully Professor M. D. Checkel for providing the permission to conduct experiments in Engine Research Laboratory of University of Alberta, Edmonton, Canada.

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Correspondence to Elaheh Neshat.

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Parsa, S., Neshat, E. Thermodynamic and statistical analysis on the effect of exhaust gas recirculation on waste heat recovery from homogeneous charge compression ignition engines. J Therm Anal Calorim 147, 6349–6361 (2022). https://doi.org/10.1007/s10973-021-10923-y

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  • DOI: https://doi.org/10.1007/s10973-021-10923-y

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