Buildings,
Год журнала:
2024,
Номер
14(8), С. 2257 - 2257
Опубликована: Июль 23, 2024
Cool
roofs
are
roofing
systems
designed
to
reflect
significant
solar
radiation,
reducing
heat
absorption
and
subsequent
cooling
energy
demands
in
buildings.
This
paper
provides
a
comprehensive
review
of
cool
roof
technologies,
covering
performance
standards,
material
options,
energy-saving
potential,
hygrothermal
considerations.
The
examines
provisions
current
codes
which
specify
minimum
requirements
for
reflectance,
thermal
emittance,
reflectance
index
(SRI)
values.
These
criteria
often
vary
based
on
factors
like
slope,
climate
zone,
building
type.
Different
materials
explored,
including
reflective
paints
coatings
that
can
be
applied
existing
as
cost-effective
solutions.
Several
studies
have
demonstrated
the
benefits
roofs,
showing
reductions
loads,
indoor
air
temperatures,
peak
demand,
overall
consumption
compared
traditional
roofs.
However,
must
evaluated,
especially
cold
climates,
optimize
insulation
levels
avoid
moisture
accumulation
risks,
reduced
alter
migration
patterns
within
envelope.
While
provide
substantial
savings
hot
further
research
is
needed
validate
modeling
approaches
against
real-world
studies,
investigate
impact
seasonality
green
spaces
efficacy
urban
island
mitigation,
explore
control,
condensation
risks
humid
environments.
Buildings,
Год журнала:
2024,
Номер
14(6), С. 1582 - 1582
Опубликована: Май 30, 2024
The
use
of
phase
change
materials
(PCMs)
has
become
an
increasingly
common
way
to
reduce
a
building’s
energy
usage
when
added
the
building
envelope.
This
developing
technology
demonstrated
improvements
in
thermal
comfort
and
efficiency,
making
it
viable
solution.
current
study
intends
provide
comprehensive
review
published
studies
on
utilization
PCMs
various
constructions
energy-efficient
roofs,
walls,
ceilings.
research
question
holds
massive
potential
unlock
pioneering
solutions
for
maximizing
usefulness
reducing
cooling
demands,
especially
challenging
high-temperature
environments.
Several
issues
with
have
been
revealed,
most
significant
which
is
their
reduced
effectiveness
during
day
due
high
summer
temperatures,
preventing
them
from
crystallizing
at
night.
However,
this
investigates
how
can
delay
peak
temperature
time,
number
hours
indoor
exceeds
range.
Additionally,
improve
efficiency
by
mitigating
need
systems
hours.
Thus,
selecting
right
PCM
temperatures
both
critical
challenging.
Insulation
density,
specific
heat,
conductivity
all
play
role
heat
transfer
under
extreme
conditions.
introduces
several
quantification
techniques
paves
future
advancements
accommodate
practical
technical
related
materials.
