Heat Transfer,
Journal Year:
2025,
Volume and Issue:
unknown
Published: April 8, 2025
ABSTRACT
Solar
stills
are
highly
effective
tools
that
assist
the
transformation
of
saline
brine
water
into
potable
freshwater,
thereby
focusing
on
critical
issues
related
to
scarcity
and
quality.
The
elaborate
heat
transfer
process
occurs
inside
these
is
fundamentally
driven
by
solar
irradiance,
which
operates
as
a
renewable
energy
source,
allowing
efficient
harnessing
thermal
from
sun.
To
meaningfully
improve
overall
productivity
efficiency
still
devices,
pioneering
enhancement
in
evaporative
mechanism
applied
through
strategic
incorporation
paraffin
wax
positioned
beneath
surface
basin,
functions
storage
medium.
In
present
work,
an
analytical
solution
done
study
performance
hemispherical
with
addition
phase
change
material
(PCM),
aid
COMSOL
Multiphysics
6.2
software.
Five
values
PCM
masses
were
used:
1,
5,
10,
20,
30
kg.
Results
show
increase
both
efficiency.
case
(1
kg)
shows
better
123%
for
productivity.
was
shown
working
hours
after
sunset.
Materials,
Journal Year:
2025,
Volume and Issue:
18(7), P. 1503 - 1503
Published: March 27, 2025
With
the
rapid
development
of
urban
rail
transit,
floating
slab
vibration
isolation
system
has
become
widely
used
in
field
due
to
its
effective
reduction
and
capabilities.
Traditional
vibration-isolation
systems
mainly
focus
on
blocking
transmission,
neglecting
energy
harvesting.
This
paper
proposes
a
magnetic-coupled
double-wing
negative
stiffness
harvester
for
slabs.
A
single-wing
piezoelectric
beam
model
finite
element
module
are
established.
The
modal
output
characteristics
analyzed.
Furthermore,
force
magnetically
coupled
results
show
that
contribution
width
frequency
gradually
decreases
with
an
increase
length
beam.
thickness
significantly
influences
characteristic
frequency,
load
is
exponentially
related
power.
At
optimal
beam,
decrease
width.
peak
value
magnetic
gap.
remanent
strength
indicates
initial
state
ring
more
easily
affected
by
external
conditions.
change
axial
becomes
significant
increased
displacement.
research
enriches
theoretical
harvesting
technology
mechanism
while
providing
important
support
subsequent
experimental
research,
design,
practical
applications.
