Journal of Fluid Mechanics,
Год журнала:
2023,
Номер
966
Опубликована: Июль 10, 2023
The
presence
of
thermocapillary
(Marangoni)
convection
in
microgravity
may
help
to
enhance
the
heat
transfer
rate
phase
change
materials
(PCMs)
space
applications.
We
present
a
three-dimensional
numerical
investigation
nonlinear
dynamics
melting
PCM
placed
cylindrical
container
filled
with
n-octadecane
and
surrounded
by
passive
air.
exchange
between
ambient
air
is
characterized
terms
Biot
number,
when
temperature
has
linear
profile.
effect
on
topology
front
studied
varying
applied
difference
circular
supports
through
interface.
evolution
Marangoni
during
leads
appearance
hydrothermal
instabilities.
A
new
mathematical
approach
for
analysis
emerging
waves
(HTWs)
suggested.
Being
first
time
examination
PCMs,
this
procedure
allows
us
explore
nature
coupling
HTWs
gain/loss
interface,
how
it
changes
over
time.
observe
variety
dynamics,
including
standing
travelling
waves,
determine
their
dominant
secondary
azimuthal
wavenumbers.
Coexistence
multiple
different
wavenumbers,
rotating
same
or
opposite
directions,
among
most
fascinating
observations.
Journal of Energy Storage,
Год журнала:
2023,
Номер
67, С. 107545 - 107545
Опубликована: Май 1, 2023
The
purpose
of
a
phase
change
material
(PCM)
is
to
store/release
energy
during
its
transition
from
solid
liquid
state,
being
able
count
on
range
melting/crystallization
temperatures
comparable
environmental
temperatures.
inclusion
PCM
in
mortars,
or
other
construction
elements,
guarantees
reduction
consumption
for
heating
and
cooling
buildings,
provided
that
the
corresponds
variation
This
implies
with
suitable
must
be
identified
each
climate
zone.
Two
Poly-Ethylene
Glycol
(PEG)-based
form-stable
PCMs
have
been,
then,
produced
intent
include
them
mortars
applied
buildings
located
different
climatic
zones,
i.e.
continental
Mediterranean
regions.
were
realized
starting
two
PEGs
possessing
molecular
weights,
PEG800
PEG1000,
characterized
by
ranges
included
flakes
porous
stone,
i.e.,
Lecce
Stone
(LS),
produce
PCMs,
namely:
LS/PEG800
LS/PEG800_PEG1000
(50/50
wt%).
In
present
paper,
thermal
performance
PCM-modified
was
assessed
chamber
simulate
zones
under
consideration.
effectiveness
original
mitigate
indoor
temperature
fluctuations
was,
assessed:
it
found
mortar
formulations
containing
mixed
(i.e.,
compound)
offered
best
advantage
reducing
needs
8
%
13
%,
respectively.
On
basis
these
results,
savings
heating/cooling
calculated,
corresponding
costs:
especially
those
based
hydraulic
lime,
noticeable
cost,
around
summer,
12
spring
autumn
seasons
internal
area.
time
lag
between
maximum
minimum
respect
external
(which
simulates
one)
also
evaluated:
cement-based
generally
performed
best,
regardless
zone
taken
as
reference.
Energies,
Год журнала:
2023,
Номер
16(12), С. 4806 - 4806
Опубликована: Июнь 19, 2023
The
construction
industry
is
responsible
for
high
energetic
consumption,
especially
associated
with
buildings’
heating
and
cooling
needs.
This
issue
has
attracted
the
attention
of
scientific
community,
governments
authorities
from
all
over
world,
in
European
Union,
motivated
by
recent
international
conflicts
which
forced
countries
to
rethink
their
energy
policies.
Over
years,
consumption
been
based
on
non-renewable
sources
such
as
natural
gas,
oil
coal.
Nowadays,
it
urgent
implement
solutions
that
aim
minimize
these
consumptions
act
clean
renewable
sources.
In
phase
change
materials
(PCM)
have
become
an
area
interest
development,
since
they
allow
buildings,
solar
energy,
due
thermal
storage
capacity.
main
objective
this
work
consists
a
perspective
evolution
development
application
technology
through
incorporation
PCM
sector,
focusing
last
10
years
research,
showing
most
developments
its
materials,
mortars,
concrete,
porous
aggregates,
naturally
carbon-based
boards,
blocks
systems.
