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Thermo-Ecological Analysis of Irreversible Dual-Miller Cycle (DMC) Engine Based on the Ecological Coefficient of Performance (ECOP) Criterion

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Iranian Journal of Science and Technology, Transactions of Mechanical Engineering Aims and scope Submit manuscript

Abstract

In this paper, an ecological-based numerical analysis and optimization have been carried out for an air-standard irreversible Dual-Miller cycle engine with late inlet valve closing version using the ecological coefficient of performance (ECOP) criterion which covers finite rate of heat transfer, heat leak and internal irreversibilities. A detailed computational analysis has been performed in order to examine the general and optimum performances of the cycle. The results obtained based on ECOP function are compared with a different ecological function and with the maximum power output conditions. The consequences of ECOP, ecological function and maximum power output conditions are acquired based on the compression ratio, cut-off ratio, pressure ratio, Miller cycle ratio, source temperature ratio and internal irreversibility parameter. The influences of these parameters on the optimum performances are examined in detail.

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Abbreviations

A :

Heat transfer area (m2)

\( C_{\text{P}} \) :

Specific heat at constant pressure (kW/kg K)

\( \dot{C}_{\text{W}} \) :

\( \dot{m}C_{\text{P}} \) (kW/K)

DC:

Diesel cycle

DDC:

Dual-Diesel cycle

DMC:

Dual-Miller cycle

\( \dot{E} \) :

Ecological performance function

ECOP:

Ecological coefficient of performance

\( I_{{\Delta S}} \) :

Internal irreversibility parameter

\( k \) :

Isentropic exponent

MC:

Miller cycle

\( \dot{m} \) :

Mass flow rate (kg/s)

\( N_{\text{T}} \) :

Total number of heat-transfer units

OC:

Otto cycle

\( P \) :

Pressure (kPa)

\( \dot{Q} \) :

Rate of heat transfer (kW)

\( r \) :

Compression ratio, \( r = v_{\text{1}} /v_{\text{2}} \)

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

Miller cycle ratio, \( r_{\text{M}} = v_{\text{6}} /v_{\text{1}} \)

\( S \) :

Entropy (kJ/K)

\( T \) :

Temperature (K)

\( U \) :

Overall heat-transfer coefficient (kW/m2 K)

\( V \) :

Volume (m3)

\( \dot{W} \) :

Power output (kW)

\( \alpha \) :

Stroke ratio, \( \alpha = v_{\text{6}} /v_{\text{2}} \)

\( \beta \) :

Pressure ratio, \( \beta = T_{\text{3}} /T_{\text{2}} \)

\( \varepsilon \) :

Heat-exchanger effectiveness

\( \chi \) :

Allocation ratio \( \left( {N_{{\text{H1}}} + N_{{\text{H2}}} } \right) /N_{\text{T}} \)

\( \eta \) :

Thermal efficiency

\( \eta_{\text{C}} \) :

Isentropic efficiency of compression

\( \eta_{\text{E}} \) :

Isentropic efficiency of expansion

\( \rho \) :

Cut-off ratio, \( \rho = T_{4} /T_{3} \)

\( \tau \) :

Source temperature ratio\( \tau = T_{\text{H}} /T_{\text{L}} \)

g:

Generation

H:

High-temperature heat-source

L:

Low-temperature heat-source

MAX:

Maximum

MEF:

At maximum thermal efficiency condition

MP:

At maximum power output condition

W:

Working fluid

0:

Environment condition

*:

At maximum ECOP condition

—:

Non-dimensional

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  1. Department of Naval Architecture and Marine Engineering, Yildiz Technical University, 34349, Besiktas, Istanbul, Turkey

    Guven Gonca

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  1. Guven Gonca
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Gonca, G. Thermo-Ecological Analysis of Irreversible Dual-Miller Cycle (DMC) Engine Based on the Ecological Coefficient of Performance (ECOP) Criterion. Iran J Sci Technol Trans Mech Eng 41, 269–280 (2017). https://doi.org/10.1007/s40997-016-0060-2

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