TITLE:
The Application of Thermomechanical Dynamics (TMD) to Thermoelectric Energy Generation by Employing a Low Temperature Stirling Engine
AUTHORS:
Hiroshi Uechi, Lisa Uechi, Schun T. Uechi
KEYWORDS:
Thermoelectric Generation Stirling Engine (TEG-Stirling Engine), Thermomechanical Dynamics (TMD), Time-Dependent Nonequilibrium Temperature, Stability of Heat Engines in a Thermal State, Optimal Fuel-Injection and Combustion Timings
JOURNAL NAME:
Journal of Applied Mathematics and Physics,
Vol.12 No.9,
September
27,
2024
ABSTRACT: A thermoelectric generation Stirling engine (TEG-Stirling engine) is discussed by employing a low temperature Stirling engine and the dissipative equation of motion derived from the method of thermomechanical dynamics (TMD). The results and mechanism of axial flux electromagnetic induction (AF-EMI) are applied to a low temperature Stirling engine, resulting in a TEG-Stirling engine. The method of TMD produced thermodynamically consistent and time-dependent physical quantities for the first time, such as internal energy
ℰ(
t
)
, thermodynamic work
W
th
(
t
)
, the total entropy (heat dissipation)
Q
d
(
t
)
and measure or temperature of a nonequilibrium state
T
˜
(
t
)
. The TMD analysis produced a lightweight mechanical system of TEG-Stirling engine which derives electric power from waste heat of temperature (
40˚C<T<100˚C
) by a thermoelectric conversion method. An optimal low rotational speed about
30<
θ
′
(
t
)/
(
2π
)
<60
(rpm) is found, applicable to devices for sustainable, clean energy technologies. The stability of a thermal state and angular rotations of TEG-Stirling engine are specifically shown by employing properties of nonequilibrium temperature
T
˜
(
t
)
, which is also applied to study optimal fuel-injection and combustion timings of heat engines.