Characterising the Response of Buildings to Climate Change: the - PowerPoint PPT Presentation

Characterising the Response of Buildings to Climate Change: the Issue of Overheating Tristan
Kershaw
and
David
Coley Centre
for
Energy
and
the
Environment,
 University
of
Exeter,
UK http://www.exeter.ac.uk/cee


•Given
current
climate
predictions

how do
typical
buildings
fare? •Carbon
emissions
currently
exceed
UKCIP high
emissions
scenario. •What
about
the
urban
heat
island
effect? London
is
typically
1.5ºC
warmer
than surroundings. •Is
there
a
need
for
extreme
scenarios? Adapted
from
UKCP09








 






 Morphing orphing What
happens
on
the
daily scale? Can
morph
existing
weather files
using
climatic projections
to
produce ‘future’
weather
years. Can
morph
twice
to produce
extreme
or
upper bound
reference
years. Creation
of
reference
year type
files
allows
whole building
thermal
simulation under
different
climatic conditions.

Buildings
last
a
long
time, there
is
a
need
to
know
how a
certain
design
will
fair
over the
coming
decades. Whole
building
thermal simulations
show
that
the number
of
hours
of overheating
increases significantly
with
time
and more
aggressive
climate change
projections.

•Thermal
comfort
of occupants
is
important. •What
are
the
main
driving factors
associated
with occupant
comfort. •Not
just
comfort,
also
health implications,
heat
stress. •Paris,
August
2003,
14,800 heat-related
deaths. •Buildings
need
to
not
only moderate
external temperatures
but
also
cool effectively.

Climate
change coefficient
 C T. •Allows
architects
to easily
consider
the •Linear
response
of
a viability
of
different design
to
different designs amounts
of
climate. •Only
two
simulations •Simple
metric are
needed
to characterised
by
external calculate
 C T 
rather air
temperature. than
one
for
each climate
projection
and •Robust
to
large
changes time-slice. in
weather
patterns. •The
internal •Allows
architects
to conditions
of
a
building easily
consider
the can
be
estimated
for viability
of
different any
amount
of
climate designs. change. Coley D, Kershaw T. Changes in Internal Temperatures within the Built Environment as a Response to a Changing Climate, Building and Environment (2009), doi: 10.1016/ j.buildenv.2009.05.009

New
buildings
that
overheat New
buildings
that
overheat •Outdated
reference weather
years.
Can cause
new
buildings
to overheat. •Detailed
simulations allow
exploration
of
the parameter
space
of
 C T ; what
is
the
most
effective way
to
reduce
internal temperatures
within
a building. •Able
to
make refurbishment suggestions
to
reduce overheating.

We
can
design
climate
change
ready
buildings
! We
can
design
climate
change
ready
buildings
! Design
is
climate
change proof
until
2080
under A1FI
projections. C T = 0.55 With
no
active
cooling!