Proceedings of the Institution of Mechanical Engineers Part A Journal of Power and Energy,
Год журнала:
2024,
Номер
unknown
Опубликована: Дек. 21, 2024
This
study
focuses
on
investigating
a
PCM
based
TES
unit,
which
plays
crucial
role
in
temporarily
storing
thermal
energy
to
mitigate
the
mismatch
between
supply
and
demand.
Visual
inspection
confirmed
addition
of
rGO,
with
significant
increase
conductivity
(∼62%)
PW.
The
examined
effects
rGO
concentration
(0.25-1.00
vol%)
HTF
flow
rate
TC
TDC
TES.
Higher
reduced
both
time
due
enhanced
heat
transfer.
Increasing
from
0.375
1.5
L/min
decreased
overall
charging
time,
improved
efficiency
(∼24).
results
show
direct
correlation
TC,
TDC,
efficiency,
process
parameters
(rGO
rate),
experimental
predicted
values
demonstrating
satisfactory
agreement
(±12%,
±12%,
±2%,
respectively).
provides
practical
application
valuable
predictive
tool
for
estimating
known
rates
concentrations
wax-based
PCMs,
suggesting
as
an
effective
additive.
Engineering Research Express,
Год журнала:
2024,
Номер
6(3), С. 035514 - 035514
Опубликована: Июль 17, 2024
Abstract
Examining
the
thermal
behavior
of
specific
working
fluids,
namely
Syltherm800
and
TherminolVP-1,
in
parabolic
trough
collectors
(PTCs)
is
imperative
for
enhancing
power
generation.
This
study
addresses
a
crucial
gap
by
conducting
computational
fluid
dynamics
simulations
through
COMSOL
Multiphysics
software
experimental
tests
to
explore
advantages
utilizing
oils
over
water
as
PTCs.
Experimental
were
performed
on
water-based
PTC
Iraq
validate
numerical
model,
considering
various
operating
conditions
such
input
temperature
(323.15–423.15
K)
mass
flow
rates
(0.00926–0.0556
kg/s).
Key
parameters
including
output
temperature,
efficiency,
useful
heat,
total
heat
losses
evaluated.
The
model
was
validated
against
data,
showing
good
agreement
with
an
overall
discrepancy
1.7%
current
experiments
3.18%
literature
results.
results
indicated
that
Syltherm800,
particularly
high
rate,
outperformed
TherminolVP-1
terms
performance.
optimal
efficiency
achieved
July
rate
0.0556
kg/s
348.15
K.
range
four
months
between
50%
70%.
endorsement
PTCs
supported
their
low
vapor
pressure,
superior
stability,
extended
lifespan.
Applied Sciences,
Год журнала:
2025,
Номер
15(4), С. 1951 - 1951
Опубликована: Фев. 13, 2025
This
work
investigates
the
potential
of
a
sorption-based
thermal
energy
storage
(TES)
system
for
enhancing
integration
renewable
and
waste
heat
recovery
in
key
sectors—industry,
transport,
buildings.
Sorption-based
TES
systems,
which
utilize
reversible
sorbent–sorbate
reactions
to
store
release
energy,
offer
long-term
capabilities
with
minimal
losses.
In
particular,
aim
study
is
evaluate
efficiency
an
adsorption
various
working
pairs
under
different
operating
conditions,
by
means
thermodynamic
model
(supported
experimental
data).
Key
findings
demonstrate
that
water-based
solutions
(e.g.,
zeolite
silica
gel
composites)
perform
well
residential
transport
applications,
while
methanol-based
solutions,
such
as
LiCl-silica/methanol,
maintain
higher
industrial
contexts.
Short-term
shows
efficiencies
compared
choice
significantly
influences
performance.
Industrial
applications
face
unique
challenges
due
extreme
limiting
viable
pairs.
research
highlights
capability
systems
reduce
greenhouse
gas
emissions,
improve
efficiency,
facilitate
transition
sustainable
practices.
The
contribute
developing
cost-effective
reliable
applications.
ABSTRACT
Mixed
heat
transfer,
commonly
encountered
in
engineering
applications,
has
led
to
a
strong
focus
on
maximizing
transmission
rates.
This
study
explores
transfer
enhancement
within
magnetohydrodynamic
(MHD)
double
lid‐driven
octagonal
cavity.
The
cavity
is
filled
with
porous
media
and
loaded
nano‐encapsulated
phase
change
material
(NE‐PCM),
subjected
uniform
magnetic
field.
Galerkin
finite
element
method
(GFEM)
employed
solve
the
governing
equations.
Key
factors
investigated
include
lid
speed
(Reynolds
number,
Re
=
1–500),
wall
movement
directions,
field
intensity
(Hartmann
Ha
0–100),
porosity
(Darcy
Da
10
−5
–10
−2
)
their
effects
numerical
was
validated
by
comparing
results
well‐documented
data
from
literature.
findings
reveal
that
higher
values
significantly
enhance
rates,
while
reduce
Specifically,
at
highest
Re,
increasing
enhanced
averaged
Nusselt
number
(
Nu
165%,
0
100
decreased
it
16%.
Additionally,
moving
both
walls
same
direction
improved
average
350%
compared
opposing
movement.
also
found
NE‐PCM
concentration
had
minimal
impact
efficiency,
reducing
chamber
permeability
hindered
suspension
movement,
thereby
between
hot
cold
surfaces.
