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Energy and exergy analysis of a hydrogen-fueled HCCI engine

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Abstract

Nowadays, engines design technology tends toward less fuel consumption and emission besides higher efficiency. Hydrogen as a clean fuel has been a point of interest for long time, but in recent years due to fossil fuel increasing prices and stringent environmental laws, more considerations have been made. In addition to the challenges of producing and storing hydrogen as a fuel for internal combustion engines, the engine performance should be independently evaluated. Simultaneous investigation of energy and exergy brings better analysis of internal combustion engines performance and helps researchers to propose more efficient ways for engines development. In this work, energy and exergy analysis of a hydrogen-fueled homogeneous charge compression ignition engine has been done to investigate the effects of engine input parameters on its performance. Considered input parameters are engine speed, inlet pressure and temperature, equivalence ratio and exhaust gas recirculation. To achieve this goal, a single-zone thermodynamic model considering detailed chemical kinetics has been employed which is able to estimate engine performance qualitatively. Results show inlet valve closing (IVC) pressure and equivalence ratio have the greatest impact on irreversibility and exergy terms, while engine speed is the least effective parameter on irreversibility production. Both power and irreversibility increase by IVC pressure enhancement, and furthermore IVC temperature increase reduces charge chemical exergy by engine volumetric efficiency decrease.

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Abbreviations

0D:

Zero dimensional

aBDC:

After bottom dead center

aTDC:

After top dead center

bBDC:

Before bottom dead center

CI:

Compression ignition

CFD:

Computational fluid dynamics

CAD:

Crank angle degree

EGR:

Exhaust gas recirculation

EVO:

Exhaust valve opening

HCCI:

Homogeneous charge compression ignition

HC:

Hydrocarbon

IMEP:

Indicated mean effective pressure

IVC:

Inlet valve closing

NOx :

Nitrogen oxides

SI:

Spark ignition

SOC:

Start of combustion

TKM:

Thermo-kinetic model

VVT:

Variable valve timing

A :

Availability

Ex:

Exergy

H :

Enthalpy

HR:

Humidity ratio

I :

Irreversibility

K :

Specific heat capacities ratio

N :

Engine speed

P :

Pressure, power

\(r_{\text{c}}\) :

Real compression ratio

S :

Entropy

T :

Temperature

V :

Volume

Y :

Mole/mass fraction

\(\theta\) :

Crank angle

\(\mu\) :

Chemical potential

\(\emptyset\) :

Equivalence ratio

0:

Dead state

C:

Chemical, clearance

gen:

Generated

Q:

Heat transfer

tm:

Thermo-mechanical

W:

Work

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Authors and Affiliations

  1. Babol Noshirvani University of Technology, Babol, Iran

    Mohamad Mostafa Namar & Omid Jahanian

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  1. Mohamad Mostafa Namar
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  2. Omid Jahanian
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Correspondence to Omid Jahanian.

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Namar, M.M., Jahanian, O. Energy and exergy analysis of a hydrogen-fueled HCCI engine. J Therm Anal Calorim 137, 205–215 (2019). https://doi.org/10.1007/s10973-018-7910-7

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  • DOI: https://doi.org/10.1007/s10973-018-7910-7

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