Journal of Non-Equilibrium Thermodynamics,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Oct. 5, 2024
Abstract
Combining
finite
time
thermodynamics
and
exergetic
analysis,
analogous
to
the
definition
of
ecological
efficient
power
for
heat
engines,
this
paper
proposes
a
unified
performance
indicator
various
cycles,
exergy-based
function
(
E
ɛ
)
which
is
defined
as
product
coefficient
performance,
introduces
it
into
optimization
endoreversible
simple
air
refrigerator
cycle
coupled
constant-temperature
reservoirs.
Relations
among
,
pressure
ratio
π
conductance
distribution
u
are
derived
by
using
numerical
method.
The
indicators
include
cooling
load
R
),
loss
rate
out
/
T
0
under
different
maximum
objective
criteria
compared.
Taking
optimal
variable,
taking
density
r
their
combinations
objectives,
multi-objective
optimizations,
totally
15
combinations,
performed
NASG-II
algorithm.
results
demonstrate
that,
can
better
reflect
compromise
.
Pareto
solution
sets
majorly
distributed
in
2.5–20
when
quadru-objective
optimizations
performed.
option
selected
LINMAP
decision-making
method
closer
ideal
bi-objective
carried
out.
Case Studies in Thermal Engineering,
Journal Year:
2024,
Volume and Issue:
61, P. 105031 - 105031
Published: Aug. 26, 2024
A
variable-angle
T-Y-shaped
fin
model
is
built
herein.
Constructal
design
of
the
studied
by
introducing
branched
angle
as
an
additional
variable.
Firstly,
with
goal
minimizing
maximum
dimensionless
excess
temperature
(MDET),
optimized.
Secondly,
heat
transfer
performance
further
optimized
2-degree-of-freedom
(DOF)
and
3-DOF
optimizations
including
angle.
According
to
results,
in
1-DOF
optimization,
when
reaches
17.2°,
MDET
minimum
at
value
30.78,
which
19.32
%
lower
than
that
90°.
Furthermore,
under
optimization
27.20,
28.70
result
90°,
11.63
optimization.
It
necessary
add
Moreover,
effect
2-DOF
significant,
while
not
obvious.
The
outcomes
obtained
from
this
study
may
serve
theoretical
counsels
for
dissipation
designs
fins
various
thermal
systems.
