Enabling Technology Project

Waste-Heat Recovery Technology

Outline of the area

Kenji Taniguchi
Specially Appointed Professor,
Osaka University

Focusing on large amounts of waste heat, our goal in this ALCA Enabling Technology Project is to surpass the conventional technologies by innovating technologies for waste-heat reduction, recovery, and storage. We especially focus on low-temperature waste heat that is produced massively but is difficult to be converted into electricity.
Using waste heat, we develop a highly efficient steam engine operated at less than 100°C and a thermoacoustic engine operated at less than 300°C. In the latter, we not only examine power generation but also the refrigerating machine.


Thermoacoustic System for Waste Heat Regeneration with 60% Carnot Efficiency

Shinya Hasegawa
Associate professor, Tokai universty

Thermoacoustic system for waste heat regeneration with 60% Carnot efficiency.

In industries and vehicles, more than 60% thermal energy is thrown away as the waste heat. Moreover, these are dissipated in several places and it is very difficult to recover these wastes.Research works are conducted to reuse these waste heat using the thermoacoustic systems.


Development of Trilateral Steam Cycle for Waste Heat Recovery

Naoki Shikazono
Professor, IIS, The University of Tokyo

Development of Trilateral Steam Cycle for Waste Heat Recovery
Testing apparatus for Trilateral Cycles

Trilateral cycle is a heat engine which can achieve the highest exergy recovery efficiency from heat sources of finite heat capacity. It extracts work during adiabatic gas-liquid two phase expansion, which must be investigated intensively. In the present study, a novel vibration-free reciprocating expander is under development. Finally, optimal operation and control of the cycle will be examined to demonstrate the feasibility of the system.

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