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.
HardwareX,
Год журнала:
2023,
Номер
16, С. e00496 - e00496
Опубликована: Дек. 1, 2023
Estimating
the
total
thermal
capacity
for
phase
change
material
(PCM)
as
heat
storage
is
extremely
important
to
set
proper
operational
parameter
of
latent
tank
(LST)
unit.
However,
estimating
solid–liquid
PCM
relatively
complex
due
temperature-dependent
properties
each
phase.
Thus,
predicting
state
charge
(SoC)
indicator
LST
unit
technically
complex.
The
common
approach
taken
by
fusion
during
melting
process
and
monitoring
working
fluid
temperature,
which
makes
SoC
estimation
less
accurate.
present
project
proposes
a
reliable
method
with
an
affordable
apparatus
estimate
simultaneously
based
on
temperature
low-temperature
PCM.
Moreover,
sensible
heating
transition
also
estimated
precisely
energy
balance
at
given
temperature.
developed
employs
widely
available
components
cost
possible
further
customization.
Validation
characterization
are
done
comprehensibly
comparing
measurement
from
differential
scanning
calorimetry
previous
studies.
results
indicate
suitable
capacity,
including
partial
fusion.
Case Studies in Chemical and Environmental Engineering,
Год журнала:
2024,
Номер
9, С. 100751 - 100751
Опубликована: Май 6, 2024
This
work
proposes
new
approach
for
recycling
plastic
to
form
stabilized-hexadecanoic
acid
(SHA)
as
material
thermal
storage
technology
(TST).
Surface
profile
of
SHA
shows
the
is
embedded
effectively,
maintaining
chemical
and
phase
structural
remains
identic
with
HA.
The
synthesized
indicates
a
lower
supercooling
(2.2
°C)
high
latent
heat
capacity
above
135
J/g.
Also,
has
higher
specific
rating
charge
around
61.35%
than
finding
demonstrates
feasible
consideration
recycle
energy
material,
which
can
be
used
fundamental
basis
designing
specialized
TST
system
production
method
SHA.
International Journal of Thermofluids,
Год журнала:
2024,
Номер
23, С. 100732 - 100732
Опубликована: Июнь 13, 2024
This
study
proposes
a
new
model
operation
for
an
intermediate
thermal
storage
(ITS)
tank
solar
water
heater
system.
It
combines
passive-charge
active-discharge
(PCAD)
in
single
tank,
potentially
reducing
the
number
of
components
system
and
improving
net
energy
balance.
The
charge
process
is
done
by
heating
material
using
electric
heater,
which
also
suitable
direct
photovoltaic
heating.
temperature
profile
stabilized
this
stage
shows
close
plateau
line
solid-liquid
transition,
indicating
steady
phase
transition
takes
place.
minimizes
deviation
between
solid/liquid
region,
advantageous
determining
protocol.
For
discharge
process,
working
fluid
circulates
from
mantle
side
continues
to
inner
resulting
two-consecutive
allows
harness
stored
heat
up
72.8%.
achieved
material,
has
better
solidification
mechanism.
Thus,
proposed
PCAD
able
meet
criteria
ITS
requires
exchange
during
charge/discharge
stage.
finding
demonstrates
that
simplification
achievable.
implication
can
be
used
as
fundamental
basis
developing
systems,
including
photovoltaic-heating
systems
where
taken
alternative
instead
electricity.
EUREKA Physics and Engineering,
Год журнала:
2024,
Номер
4, С. 90 - 100
Опубликована: Июль 19, 2024
The
application
of
solar
dryer
through
greenhouse
(GH)
model
as
drying
method
for
crops-based
product
is
extremely
important
in
industrial
scale
agriculture,
especially
developed
country.
considered
environmentally
friendly
since
it
utilizes
power
the
main
energy.
However,
fundamental
operational
aspect
basic
GH
less
discussed
according
to
mechanism
dried
product.
In
this
work,
three
small-scale
are
evaluated:
open
(OD),
natural
convection
(NCGH),
and
forced
(FCGH).
potato,
which
can
be
taken
an
essential
agricultural
modern
world.
OD
has
lowest
mass
loss
rate
than
50
%
water
from
evaporated.
operation
both
satisfactory,
resulting
more
60
moisture
evaporation.
characteristic
indicates
two-step
failing
makes
fluctuation
process.
highest
observed
during
constant
period
around
21
FCGH
18
NCGH.
addition,
detailed
analysis
on
effect
each
process
work.
For
example,
presence
hair-like
structure
movement
pith
potato
Also,
a
higher
NCGH
initiate
gelatinization
compartmentalization,
substantial
evaporation
It
confirms
correlation
diffusion
finding
study
vital
reference
improving
IOP Conference Series Earth and Environmental Science,
Год журнала:
2024,
Номер
1388(1), С. 012057 - 012057
Опубликована: Сен. 1, 2024
Abstract
Hydropower,
as
a
renewable
energy
source,
holds
significant
potential
for
electricity
generation.
However,
optimizing
the
design
of
hydropower
penstocks
to
ensure
efficient
conversion
remains
complex
challenge.
This
study
aims
address
this
gap
by
investigating
optimal
hydraulic
calculations
designing
penstock
system
in
Lampung,
Indonesia,
thereby
contributing
understanding
micro
engineering.
The
research
adopts
an
explanatory
methodology,
utilizing
case
approach
Bukit
Kemuning,
Indonesia.
Design
data
collection
at
site
and
relevant
indicators
from
literature
serve
foundation
conducting
comprehensive
calculations.
focuses
on
key
parameters
such
dimensions,
power
generation
capacity,
loss
assessments
inform
process.
analysis
reveals
flow
rate
11
m
3
/s
velocity
2.43
m/s,
resulting
targeted
output
3234
Kilowatts.
findings
underscore
critical
role
elevation
considerations
Detailed
elucidate
determination
evaluation
losses,
consideration
surge
pressure
resilience.
To
withstand
high
water
pressure,
advocates
pipes
with
specific
dimensions:
two
pipes,
each
116
length,
diameter
2.4
cross-sectional
area
4.52
2
requiring
thickness
10
mm.
identifies
reduction
factors,
including
head
due
friction
(0.169
m),
losses
(0.1635
hammer
reaching
bar
acceleration
88.03
m/s
.
net
after
turbulent
is
determined
be
30
m.
highlights
importance
tailored
strategies
effectively
harnessing
resources,
offering
valuable
insights
projects
globally.
