Materials,
Год журнала:
2025,
Номер
18(7), С. 1512 - 1512
Опубликована: Март 27, 2025
Passive
radiation
cooling
technology,
as
a
new
zero-energy
refrigeration
technology
method,
has
received
widespread
attention
in
recent
years.
However,
due
to
differences
the
testing
devices
used
by
different
teams,
it
becomes
difficult
directly
compare
performance
of
respective
prepared
materials.
This
study
combines
experimental
and
theoretical
methods
explore
impact
equipment
sample
size
on
results
radiative
capacity
evaluation.
The
research
show
that
when
evaluating
materials
thermal
insulation
chambers,
if
diameter
is
equal
or
larger
than
10
cm,
at
≥
cm
insulated
stabilizes
~25
°C
(daytime)
~28
(nighttime),
with
<2%
variation
across
sizes.
evaluation
not
affected
structure
test
material.
variations
placement
depth
will
always
have
significant
results,
so
uniform
needs
be
specified.
In
addition,
using
an
open
device
evaluate
materials,
greater
foam
pad
thickness
8
reduces
interference
89%,
enabling
consistent
evaluations.
measured
value
also
material
device.
provides
basis
for
standardization
radiant
testing,
thereby
promoting
practical
application
technology.
Nanophotonics,
Год журнала:
2023,
Номер
13(5), С. 583 - 591
Опубликована: Окт. 18, 2023
Passive
radiative
cooling
is
an
energy-free
method
by
exchanging
thermal
radiation
with
the
cold
universe
through
transparent
atmospheric
window.
Spectrum
tailoring
of
cooler
key
to
daytime
in
previously
reported
works.
In
addition,
coolers
large-scale
fabrication
and
self-cleaning
characteristics
should
be
further
developed
improve
their
industrial
applicability.
Herein,
we
propose
a
bilayer
coating
superhydrophobic
property
scalable
process,
covering
TiO
Advanced Functional Materials,
Год журнала:
2024,
Номер
unknown
Опубликована: Сен. 2, 2024
Abstract
Solar‐induced
thermal
challenges
in
buildings,
cold
chain
logistics,
and
spacecrafts
may
be
overcome
by
integrating
passive
radiative
cooling
(PRC)
with
aerogels
having
insulation
(TI).
Herein,
a
universal
silica
aerogel
(UCSA)
is
prepared
through
the
simple
regeneration
freeze‐drying
of
commercial
quartz
fiber
membranes.
The
optically
engineered
UCSA
hybrid
structure
(silica
nanofibers/microbeads)
achieves
remarkable
solar
reflectance
(
R
S.E.
=
98.1%)
atmospheric
transparency
window
emittance
ε
ATW
92.1%)
under
Earth
conditions,
theoretical
daytime
power
103.3
W
m
−2
.
In
harsh
space
environment,
it
exhibits
ultrahigh
average
99.1%)
broadband
mid‐infrared
MIR
90%),
achieving
354.1
Compared
to
single‐functional
approaches,
synergistically
integrates
PRC
TI
performance
for
excellent
management
capability.
Moreover,
this
ceramic
can
resist
temperatures
up
830
°C,
safeguarding
building
occupants
spacecraft
electronics.
Furthermore,
passes
environmental
aging
vacuum
outgassing
tests
long‐term
viability
both
on
space.
Finally,
USCA‐covered
box
an
sub‐ambient
18.6
°C
when
exposed
sunlight.
summary,
opens
path
energy‐efficient
sustainable
strategy
applications.
Physics Open,
Год журнала:
2024,
Номер
19, С. 100216 - 100216
Опубликована: Апрель 4, 2024
A
theoretical
and
numerical
study
is
conducted
on
nonlinear,
steady-state
thermal
convection
boundary
layer
flow
of
a
magnetized
incompressible
Tangent
Hyperbolic
non-Newtonian
fluid
from
rotating
cone
to
non-Darcy
porous
medium.
Power-law
variation
in
temperature
the
surface
considered
radiation
heat
transfer
also
present.
The
Brinkman-Darcy-Forchheimer
model
deployed
for
motivated
by
rotational
(spin)
coating
with
new
emerging
magnetic
rheological
polymers,
process
which
often
utilizes
filtration
media
high
temperatures.
transformed
non-dimensional
conservation
equations
are
solved
numerically
subject
physically
appropriate
conditions
using
second-order
accurate
implicit
finite-difference
Keller
Box
technique.
code
validated
previous
studies.
Extensive
visualization
axial,
tangential
velocity
components
distributions
key
parameters
including
Rosseland
radiative
number,
Darcy
Forchheimer
number
(non-Darcy
inertial
parameter),
interaction
parameter,
tangent-hyperbolic
power-law
index
Weissenberg
(non-Newtonian)
included.
Additionally,
axial
(circumferential)
skin
friction
Nusselt
values
tabulated
control
parameters.
With
increasing
depleted
near
surface,
suppressed
throughout
regime
strongly
enhanced.
Axial
decelerated
further
there
significant
depletion
(swirl)
velocity.
Temperature
however
boosted
transverse
rise
index.
Both
increment
parameter
whereas
thickness
larger
(i.e.
greater
permeability),
increased
no
tangible
modification
cone;
However
consistently
elevated
depleted.
An
increase
substantially
damps
both
it
elevates
temperature.
Increasing
flux
energizes
polymer
but
suppresses
velocities.
elevation
non-isothermal
wall
exponent,
at
vertex.
Further
along
similar
response
observed
reduction
magnitudes
friction.
Biomacromolecules,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 23, 2025
Herein,
an
eco-friendly
and
degradable
poly(lactic
acid)
aerogel
was
prepared
by
combining
a
poly(ethylene
glycol)
template
material
with
thermally
induced
phase
separation.
Due
to
the
tailored
pore
size
introduced
material,
exhibits
high
solar
reflectance
(92.0%),
excellent
thermal
emittance
(90.5%),
low
conductivity
(52.0
mW
m-1
K-1),
compressive
strength
(0.15
MPa).
Cooling
tests
demonstrate
that
can
achieve
temperature
drops
of
3.7
°C
during
day
6.2
at
night.
Furthermore,
simulations
building
cooling
energy
systems
reveal
reduce
consumption
2.2
10.2
MJ
m-2
per
year
in
various
cities,
achieving
savings
ranging
from
8.2
24.3%.
Meanwhile,
cooler
demonstrates
self-cleaning
performance
(WCA
=
149.1°)
cyclic
compression
performance.
This
research
will
promote
field
passive
radiative
toward
greener
more
sustainable
direction.
