A practical approach-based technical review on effective utilization of exhaust waste heat from combustion engines

ABSTRACT

The energy demand has increased multiple crowds in recent times, thanks to the increased transportation of goods, people, and artificial requirements. Due to this miracle, experimenters are exploring innovative results to fulfill unborn energy conditions. It is estimated that a significant proportion of the energy, roughly 30, gets dissipated through exhaust smothers, whereas a negligible chance gets absorbed by the crankshaft of the machine. The raising costs of energy and strict pollution control regulations across the globe have led to renewed interest in combustion machines. Consequently, the researchers have underscored the significance of optimizing the operation of thermal energy in machines. The current review composition examines various ways for the operation of exhaust heat analogous to the Organic Rankine Cycle (ORC) for Waste Heat Recovery (WHR) and different working fluids for thermal energy birth and heat exchangers for system recovery and performance. The quantitative studies published before infer that the operation of wasted thermal energy from machines can address the issues of archconservative energy reduction and also reduce environmental pollution. The novelty of the composition lies in optimizing the operation of the available unused heat energy through varying operating conditions, machine design, and material advancements which in turn can enhance the machine’s effectiveness and minimize the emigrations. The study concludes that waste heat can be effectively employed to induce fresh power which in turn improves the overall thermal effectiveness and effective operation of the waste heat energy through the performance of heat recovery system. Likewise, predicated on the issues from quantitative analysis, the study recommends that innovative heat exchanger designs and different parameters of the heat exchangers can significantly meliorate the energy economy of diesel machines.

KEYWORDS:

• Waste heat recovery
• combustion engines
• heat exchangers and design
• working fluids
• effective exhaust heat utilization

Highlights

• The current review focuses on different technologies used in WHR applications.

• The study provides a detailed review of the working fluids and their performance in WHR systems.

• This research also reviews the fundamental design and application of heat exchangers in WHR systems.

• The article provides a practical approach for optimizing waste heat recovery in Internal Combustion Engines (ICEs).

Abbreviations

WHR	=	Waste heat recovery
ORC	=	Organic Rankine cycle
IC	=	Internal combustion
ICE	=	Internal combustion engine
TEG	=	Thermoelectric generator
TPV	=	Thermophotovoltaic
WF	=	Working fluid
LMTD	=	Logarithmic Mean Temperature Difference
NTU	=	Number of Transfer Units
Hex	=	Heat exchanger
EGR	=	Exhaust gas recirculation
QT	=	Heat transfer rate
HEN	=	Heat Exchanger network

Acknowledgements

This work is supported and funded by the CNRST and UM6P under the APRD project titled “Design and development of exhaust heat recovery system and emission reduction technology for multi-cylinder CRDI engine.” The authors do thank LERMA Laboratory, the International University of Rabat for ensuring the availability of facilities.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Notes on contributors

Rajesh Ravi

Rajesh Ravi is a Professor in the School of the Aerospace and Automotive Engineering, International University of Rabat, Morocco.

Oumaima Douadi

Oumaima Douadi is a PhD student in the School of the Aerospace and Automotive Engineering, International University of Rabat, Morocco.

Manoranjitham Ezhilchandran

Manoranjitham Ezhilchandran is a Visiting Faculty in the School of the Aerospace and Automotive Engineering, International University of Rabat, Morocco, and Research scholar in the Mohammadia school of Engineers, Morocco.

Mustapha Faqir

Mustapha Faqir is an Academic Director and Professor in the School of the Aerospace and Automotive Engineering, International University of Rabat, Morocco.

Elhachmi Essadiqi

Elhachmi Essadiqi is a Dean and Professor in the School of the Aerospace and Automotive Engineering, International University of Rabat, Morocco.

Merouan Belkasmi

Merouan Belkasmi is a Professor in the School of the Aerospace and Automotive Engineering, International University of Rabat, Morocco.

Shivaprasad K. Vijayalakshmi

Shivaprasad K. Vijayalakshmi is a Professor in the Department of Engineering, Bearys Institute of Technology, Dakshina Kannada, Mangalore 574153, India