Table of Contents
Technology Analysis of Advanced Exhaust Heat Recovery Systems in Passenger Cars : Thermoelectric Generator and Turbogenerator Success Expected after 2020
Exhaust heat recovery (EHR) is a promising approach to reducing fuel consumption of future vehicles powered by internal combustion engines. Besides reducing exhaust emissions, EHR concepts focus on improving the use of primary energy. Irrespective of displacement, contemporary internal combustion engines convert less than 40% of the fuel energy used into mechanical energy. In low-load urban driving cycles, efficiency can fall below 20%. This study provides a strategic overview of EHR technologies in the passenger vehicle market in Europe and North America, including key R&D trends, market drivers and restraints, and adoption goals. Other objectives include analysing disruptive technology alerts and market direction by OEM from 2015 to 2022.
Executive Summary—Key Findings
Fuel economy, cost of technology, ease of integration/packaging, and durability/reliability goals have not been met, and the thermoelectric generator (TEG) and Rankine cycle exhaust heat recovery system (EHRS) technologies need significant development. Thus, OEMs expect the commercial implementation of these two technologies beyond 2020.
TEG is favoured as a more viable solution due to technological improvements, low technology cost, less packaging space/integration effort, and a better durability/reliability in comparison to Rankine cycle. OEMs are of the opinion that the Rankine cycle is less suitable for passenger car applications.
Rankine Engine Outlook & Challenges:
Rankine cycle cost, weight, and reliability are the major challenges for Rankine cycle recovery systems, which are unlikely to be commercialized before 2020. Honda is targeting Rankine cycle for hybrid application.
Exhaust Heat Recovery (Ehr) Technologies—Adoption Detterents:
High cost, complexity of integration, and low energy recovery potential of current generation of EHR technologies are a major deterrent for TEG and turbogenerator adoption.
Key Questions this Study will Answer
- What are the advantages and considerations (e.g., cost of system, integration issues, CO2 emission levels, and efficiency gain) that OEMs weigh before adopting EHR systems?
- What is the systems introduction strategy for key OEMs in Europe and North America and what are their preferred technologies?
- How will these technologies penetrate different segments in key global OEM line-ups for Europe and North America?
- What are the pertinent indices to measure the performance of these systems? How will these systems evolve over the coming years to match the market demands?
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