Carbon Trends,
Год журнала:
2023,
Номер
13, С. 100294 - 100294
Опубликована: Сен. 9, 2023
The
present
work
evaluates
the
proportional
ratio
of
multi-walled
carbon
nanotubes
(MWCNT)
for
improving
thermal
conductivity
(k)
paraffin
wax
(PW)
and
polymeric-paraffin
with
high-density
polyethylene
(PW/HDPE).
k
value
is
assessed
at
40
°C,
60
°C
120
different
MWCNT
content
(0–10
wt%
MWCNT).
measurement
indicates
varies
significantly
temperatures.
study
suggests
that
ideal
limited
to
6
wt%.
justification
based
on
suitable
average
PW
(0.532–0.625
W·m-1·K-1)
PW/HDPE
(0.595–0.641
W·m-1·K-1).
Active
storage
(ATS)
evaluation
shows
significant
improvement
in
rating
performance
PCM
MWCNT.
charge
cycle
increases
by
39%
a
peak
power
49.8
Watts
PW.
Unfortunately,
melting
intensification
240
h
causes
degradation
due
precipitation
which
disturbs
dispersed
particle
within
In
contrast,
composite
maintains
unsubstantial
change
after
intensification,
where
obtained
40.6
40.1
before
intensification.
Eastern-European Journal of Enterprise Technologies,
Год журнала:
2024,
Номер
2(6 (128)), С. 31 - 38
Опубликована: Апрель 30, 2024
Heat
storage
technology
has
a
critical
role
for
number
of
applications
involving
renewable
thermal
energy
(such
as
solar
water
heater).
The
application
wax
(n-octacosane/OCT)
medium
storing
heat
brings
many
positive
influences
the
system.
However,
operational
curve
is
undesirable
OCT-based
storage,
which
makes
it
necessary
to
use
binding
material.
present
work
employed
LD-class
polymer
(LDPE)
and
linear-LDPE
materials
OCT.
mixture
prepared
through
mechanical
hot
stirring,
comes
into
two
categories:
SOCT1
(OCT/LD)
SOCT2
(OCT/LLD).
assessment
calorimetry
method
shows
an
increment
in
transition
temperature
SOCT
with
value
2.1
°C
5.5
°C.
This
contributes
variation
fusion
solid-liquid
change
both
materials,
amounted
132.05
J/g
(SOCT1)
113.4
(SOCT2).
Another
related
its
chemical
structural
phase
demonstrates
that
identical
structure
OCT,
indicating
mixed
physically.
At
level,
more
optimal
than
OCT
according
indicator
charge
discharge
duration
exchange.
short
plateau
line
indication
steady
between
65.4–67.9
°C,
while
indicates
average
heating
rate,
higher
single
releasing
varies
at
lower
1.92
°C/min
0.77
°C/min,
lowest
variation,
only
0.17
°C/min.
Moreover,
self-insulation
0.3
evaluation
analysis
from
this
show
reliable
increase
can
be
implemented
systems
Materials Science,
Год журнала:
2024,
Номер
unknown
Опубликована: Июль 1, 2024
The
operational
aspect
of
a
latent
thermal
energy
storage
(LTES)
system
is
highly
dependent
on
the
performance
its
heat
material
(LHSM).
In
this
work,
evaluation
LHSM
conducted
using
low-density
polyethylene
(LDPE)
and
linear
LDPE.
As
an
initial
assessment,
three
different
organic
LHSMs
are
used
for
evaluation.
assessment
indicates
that
fusion
varies
between
142.45
J/g
198.8
J/g.
Thermal
decomposition
demonstrates
suitable
operating
power
under
100
°C.
addition
polymer
clearly
influences
charge/discharge
rate
each
LHSM.
For
example,
it
has
positive
influence
paraffin
wax,
which
increases
charge
up
to
54.4
%.
A
outcome
also
observed
palmitic
acid,
highest
at
around
4.4
°C/min.
Interestingly,
stearic
acid
decreased
by
presence
polymer.
It
implies
melting/solidification
can
be
decreased,
may
advantageous
passive
systems.
general,
LDPE/LLDPE
alters
makes
taken
as
stabilizer
Eurasian Physical Technical Journal,
Год журнала:
2024,
Номер
21(2(48)), С. 14 - 21
Опубликована: Июнь 26, 2024
The
rating
charge
characteristic
is
crucial
for
the
heat
energy
storage,
particularly
low-temperature
system
which
uses
paraffin
wax.
influence
of
different
causes
severe
temperature
fluctuation,
undesirable
system.
It
affected
by
unstable
phase
transformation,
reducing
distribution
and
makes
average
insufficient.
In
this
work,
fluctuation
can
be
minimized
adding
polyethylene
plastic
as
stabilizer
added
ratio
weight
15%
from
total
mass
134
grams.
Each
material
mixed
in
liquid
state,
stirred
molded
into
apparatus.
transition
evaluation
performed,
showing
mixture
indicates
an
additional
peak
after
principal
ranging
between
15.26
°C
–
19.34
(melting)
11.98
9.45
(freezing).
steady
operation
lowest
variation
only
0.3
°C/min,
obtained
wax
polyethylene.
same
charge,
has
2.9
signifying
effect
unsteady
melting
transition.
clearly
demonstrates
addition
promotes
a
better
transformation
under
various
maintaining
effective
storage.
Journal of Asian Energy Studies,
Год журнала:
2024,
Номер
8, С. 85 - 94
Опубликована: Июль 30, 2024
Direct
drying
for
seaweed
is
preferable
local
farmers
since
it
costs
no
additional
processing.
However,
the
degradation
of
dried
product
causes
economic
drawbacks,
which
means
further
methods
can
be
developed
to
solve
problem.
In
this
work,
improvement
made
by
using
a
closed
method
products
and
combined
with
solar
collector
as
an
air
heater.
The
high
evaporation
increases
humidity
within
chamber,
improves
up
17.8%.
contrast,
supplied
dry
from
reduces
becomes
lower
(4.4%)
than
ambient.
indicates
maximum
temperature
48.6°C
53.7°C
(with
collector),
while
ambient
only
36.8°C.
It
makes
receive
more
energy,
resulting
in
water
87.5%
compared
direct
(70.8%).
provides
simple
low-cost
approach
that
maximize
harvested
energy
process.
suitable
supporting
maintaining
sustainability
through
renewable
energy.
Revue des composites et des matériaux avancés,
Год журнала:
2024,
Номер
34(4), С. 409 - 415
Опубликована: Авг. 27, 2024
The
present
work
assesses
the
manufacturing
method
for
producing
ceramic-based
solid
oxide
fuel
cells
(SOFC)
using
compaction
and
sintering
methods,
which
are
combined
by
adding
pore
former
to
improve
porosity
of
produced
anode.The
ratio
varies
between
5%,
10%
15%.The
base
cermet
material
in
this
is
NiO-YSZ
(Nickle
Oxide/Yttria
Stabilized
Zirconia),
suitable
high-temperature
SOFC.The
mixed
with
at
given
ratio,
followed
ultrasonic
cleaning.This
uses
polyethylene
glycol
(PEG,
10%)
as
binder
material.The
slurry
then
dried
electric
oven,
continued
process
a
pressure
135MPa
sintered
4
hours
1200℃.The
addition
leads
significant
improvement
level,
highest
value
16.67%.It
contributes
excellent
performance
anode,
particularly
permeability
value.The
15%
has
average
0.37
m
2
.Moreover,
detailed
profile
shows
baseline
5%
10%,
experiences
variation
level
value.
Carbon Trends,
Год журнала:
2023,
Номер
13, С. 100294 - 100294
Опубликована: Сен. 9, 2023
The
present
work
evaluates
the
proportional
ratio
of
multi-walled
carbon
nanotubes
(MWCNT)
for
improving
thermal
conductivity
(k)
paraffin
wax
(PW)
and
polymeric-paraffin
with
high-density
polyethylene
(PW/HDPE).
k
value
is
assessed
at
40
°C,
60
°C
120
different
MWCNT
content
(0–10
wt%
MWCNT).
measurement
indicates
varies
significantly
temperatures.
study
suggests
that
ideal
limited
to
6
wt%.
justification
based
on
suitable
average
PW
(0.532–0.625
W·m-1·K-1)
PW/HDPE
(0.595–0.641
W·m-1·K-1).
Active
storage
(ATS)
evaluation
shows
significant
improvement
in
rating
performance
PCM
MWCNT.
charge
cycle
increases
by
39%
a
peak
power
49.8
Watts
PW.
Unfortunately,
melting
intensification
240
h
causes
degradation
due
precipitation
which
disturbs
dispersed
particle
within
In
contrast,
composite
maintains
unsubstantial
change
after
intensification,
where
obtained
40.6
40.1
before
intensification.
