Journal of Thermal Analysis and Calorimetry,
Год журнала:
2024,
Номер
149(19), С. 10851 - 10863
Опубликована: Фев. 24, 2024
Abstract
Passive
cooling
techniques
have
gained
widespread
use
in
everyday
life
and
various
industries
by
utilizing
sunlight
reflection
to
cool
objects
without
requiring
additional
energy
input.
Porous
polymer
materials
possess
the
unique
ability
provide
both
thermal
insulation
solar
due
their
inherent
multiphase
structure.
In
this
study,
we
developed
a
porous
polypropylene
(PP)
with
hierarchically
structured
surface
layer
using
simple
efficient
solvent
treatment
method
based
on
recrystallization.
As
result,
structure
significantly
increase
reflectance
from
11
86%.
We
found
that
manipulating
recrystallization
process
reflective
additives,
reflectivity
can
be
further
improved.
With
of
TiO
2
BaSO
4
90%
was
achieved,
while
93%
achieved
nucleating
agents.
practical
terms,
these
improvements
result
significant
temperature
reductions
performance
tests
compared
extruded
PP
sheets:
17,
19,
22
°C
for
PP,
PP/TiO
or
PP/BaSO
,
nucleated
respectively.
The
modification
introduced
could
help
offer
new
possibilities
developing
low-cost
chemically
resistant
thermally
insulating
layers
management
applications.
Renewable and Sustainable Energy Reviews,
Год журнала:
2023,
Номер
186, С. 113650 - 113650
Опубликована: Авг. 24, 2023
The
building
sector
accounts
for
over
one-third
of
global
energy
consumption
and
a
significant
share
carbon
emissions.
Improving
efficiency,
particularly
in
the
tropics,
where
most
future
development
is
foreseen,
thus
crucial.
One
main
factors
that
determine
performance
envelope.
This
paper
presents
comprehensive
review
impact
several
envelope
design
variables,
such
as
thermal,
optical,
physical,
geometrical,
on
buildings
tropics.
A
correlational
analysis
elaborates
effectiveness
each
these
measures
discussed
detail.
findings
indicate
insulation,
glazing
properties,
Window-to-wall
ratio
(WWR)
are
promising
solutions
improving
efficiency
tropical
buildings.
Among
these,
insulating
has
savings.
variables
orientation
thermal
mass
materials
have
least
influence
total
consumption.
latter
exhibits
complex
effects
regions
characterized
by
hot-humid
climates.
An
optimized
cooling-dominated
climates
should
large
aspect
ratio,
higher
WWR
north
south
facades,
an
ideal
shading
system.
With
all
combined
appropriate
ventilation,
can
save
35%
annual
up
to
60%
some
cases.
study
further
reveals
available
research
effect
shape
context
surrounding
built
environment
remains
limited.
Energy and Buildings,
Год журнала:
2023,
Номер
291, С. 113111 - 113111
Опубликована: Апрель 27, 2023
The
rise
in
greenhouse
gas
emissions
cities
and
the
excessive
consumption
of
fossil
energy
resources
has
made
development
green
spaces,
such
as
roofs,
an
increasingly
important
focus
urban
areas.
This
study
proposes
a
novel
smart
energy-comfort
system
for
roofs
housing
estates
that
utilises
integrated
machine
learning
(ML),
DesignBuilder
(DB)
software
Taguchi
design
computations
optimising
roof
operation
buildings.
optimisation
process
maximises
conservation
thermal
comfort
buildings
effective
parameters
including
Leaf
Area
Index
(P1),
leaf
reflectivity
(P2),
emissivity
(P3),
stomatal
resistance
(P4).
optimal
solutions
can
result
12.8%
increase
hours
14%
reduction
compared
to
base
case.
ML
analysis
revealed
adaptive
network-based
fuzzy
inference
is
most
appropriate
method
predicting
Energy-Comfort
functions
based
on
parameters,
with
correlation
coefficient
greater
than
97%.
framework
offers
innovative
approach
achieving
Energy and Buildings,
Год журнала:
2024,
Номер
312, С. 114164 - 114164
Опубликована: Апрель 16, 2024
Phase
Change
Materials
(PCMs)
present
cutting-edge
technology
with
substantial
promise
for
advancing
sustainable
and
energy-efficient
cooling
in
buildings.
These
materials
can
absorb
release
latent
heat
during
phase
transitions,
facilitating
thermal
energy
storage
temperature
regulation.
This
comprehensive
literature
review
explores
various
strategies
methods
implementing
passive
PCMs
The
integration
of
enhances
multiple
approaches,
including
solar
control,
ground
cooling,
ventilation-based
dissipation,
radiative
mass-based
modulation.
analysis
delves
into
PCM
classifications,
encapsulation
techniques,
melting
enthalpies,
diverse
building
envelopes,
performance
across
different
climates.
findings
from
this
indicated
that
walls
introduce
a
2-hour
delay
transfer
mitigate
external
fluctuations.
Windows
equipped
panels
reduce
by
66
%.
Combining
nocturnal
leads
to
interior
surface
reductions
exceeding
13
°C.
Natural
ventilation
results
notable
savings
up
90
%
hot
combination
free
reduces
charging
times
35
while
enhancing
transfer.
Simulations
performed
the
open
suggested
strategic
placement
lightweight
flux
overall
consumption.
Despite
facing
challenges
related
scalability,
compatibility,
reliability,
recycling,
solutions
demonstrate
robust
potential.
When
integrated
thoughtfully
design,
significantly
improve
efficiency.
Experimental
validations
confirm
ranging
14
%,
underscoring
adaptability
techniques
leveraging
capabilities
Energy and Buildings,
Год журнала:
2024,
Номер
312, С. 114125 - 114125
Опубликована: Апрель 26, 2024
Standardized
replicable
buildings
can
cause
discomfort
and
increased
air
conditioning
usage.
Besides,
super
cool
coatings
are
effective
passive
solutions.
Therefore,
this
study
evaluates
thermal
comfort
in
a
standardized
Brazilian
public
school
8
climates,
verifies
suitable
identifies
optimal
additional
techniques
to
meet
regulatory
requirements
without
active
conditioning,
topic
worthy
of
investigation.
Methods
include
pilot
simulations
with
DesignBuilder,
analysis
considering
ASHRAE
55
adaptive
model;
JEA
Algorithm
optimization
simulations;
identification
most
influential
strategies
by
sensitivity
analyses;
evaluation
the
ideal
opaque
envelope
through
heat
balance.
Results
showed
that
current
model
do
not
normative.
Thus,
different
recommended:
thermochromic
for
heating-dominated;
spectrally
selective
cooling-dominated
dry
high
broadband
emissivity
extreme-cooling-dominated
humid
zones.
Regarding
envelope,
mass
flat
roofs
insulated
walls
advised.
In
7
roof
was
followed
natural
ventilation.
Optimal
combinations
window
shading
ventilation
24
hours
days
week
95
%
free-aperture
zones;
roofs,
medium
reflectivity
5
cooling-dominated;
dark
during
occupancy
heating-dominated.
