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Comparison of Conventional and Advanced Exergy Analysis for Dual-Loop Organic Rankine Cycle used in Engine Waste Heat Recovery

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Abstract

At present, the dual-loop organic Rankine cycle (DORC) is regarded as an important solution to engine waste heat recovery (WHR). Compared with the conventional exergy analysis, the advanced exergy analysis can better describe the interactions between system components and the irreversibility caused by economic or technical limitations. In order to systematically study the thermodynamic performance of DORC, the conventional and advanced exergy analyses are compared using an inline 6-cylinder 4-stroke turbocharged diesel engine. Meanwhile, the sensitivity analysis is implemented to further investigate the influence of operating parameters on avoidable-endogenous exergy destruction. The analysis result of conventional exergy analysis demonstrates that the priorities for the components that should be improved are in order of the high-temperature evaporator, the low-temperature turbine, the first low-temperature evaporator and the high-temperature condenser. The advanced exergy analysis result suggests that the avoidable exergy destruction values are the highest in the low-temperature turbine, the high-temperature evaporator and the high-temperature turbine because they have considerable endogenous-avoidable exergy destruction. The sensitivity analysis indicates that reducing the evaporation pinch point and raising the turbine efficiency can decrease the avoidable exergy destruction.

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Abbreviations

E :

exergy/kW

E D :

exergy destruction/kW

E F :

the fuel exergy destruction/kW

E P :

the product exergy destruction/kW

e :

specific exergy/kJ·00kg−1

h :

enthalpy/kJ·kg−1

m :

mass flow rate/kg·s−1

P :

pressure/kPa

ΔP :

pressure drop/%

Q :

heat transfer rate/kW

s :

entropy/kJ·kg−1·K−1

T :

temperature/K

ΔT min :

the minimum temperature difference/K

V ref :

reference value

V est :

estimate value

W :

power/kW

y :

the exergy destruction ratio/%

y * :

the exergy rate of fuel with the total exergy

y * :

destruction/%

HT:

high-temperature

HTC:

high-temperature condenser

HTE:

high-temperature evaporator

HTP:

high-temperature pump

HTT:

high-temperature turbine

ICE:

Internal Combustion Engines

LT:

low-temperature

LTC:

low-temperature condenser

LTE:

low-temperature evaporator

LTP:

low -temperature pump

LTT:

low-temperature turbine

ORC:

Organic Rankine cycle

WHR:

waste heat recovery

ε :

exergy efficiency/%

η :

efficiency/%

0:

ambient condition

ch:

chemical

D:

destroyed

F:

fuel

g:

gas

in:

input

K :

Kth component

min:

minimum

out:

output

P:

production

ph:

phsical

t:

turbine

w:

water

AV:

avoidable

EN:

endogenous

EX:

exogenous

real:

real conditions

UN:

unavoidable

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Acknowledgments

This work was supported by the Science and Technology Major Project of Tibet of China (Grant No. XZ201801-GA-03) and the Natural Science Foundation of Hunan Province, China (Grant No. 2018JJ2399).

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Authors and Affiliations

  1. Institute of Mechanical Engineering, Xiang Tan University, Xiangtan, 411105, China

    Zhiqi Wang, Yanhua Hu & Xiaoxia Xia

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  1. Zhiqi Wang
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  2. Yanhua Hu
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  3. Xiaoxia Xia
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Correspondence to Xiaoxia Xia.

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Wang, Z., Hu, Y. & Xia, X. Comparison of Conventional and Advanced Exergy Analysis for Dual-Loop Organic Rankine Cycle used in Engine Waste Heat Recovery. J. Therm. Sci. 30, 177–190 (2021). https://doi.org/10.1007/s11630-020-1299-x

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  • DOI: https://doi.org/10.1007/s11630-020-1299-x

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