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

• rphing

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.

Whole
building
thermal simulations
show
that
the number
of
hours
of

• verheating
increases

significantly
with
time
and more
aggressive
climate change
projections. Buildings
last
a
long
time, there
is
a
need
to
know
how a
certain
design
will
fair
over the
coming
decades.

• Thermal
comfort
of
• ccupants
is
important.
• What
are
the
main
driving

factors
associated
with

• ccupant
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.

• Allows
architects
to

easily
consider
the viability
of
different designs

• Only
two
simulations

are
needed
to calculate
CT
rather than
one
for
each climate
projection
and time-slice.

• The
internal

conditions
of
a
building can
be
estimated
for any
amount
of
climate change. Climate
change coefficient
CT.

• Linear
response
of
a

design
to
different amounts
of
climate.

• Simple
metric

characterised
by
external air
temperature.

• Robust
to
large
changes

in
weather
patterns.

• Allows
architects
to

easily
consider
the viability
of
different designs.

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• Outdated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

• verheat.
• Detailed
simulations

allow
exploration
of
the parameter
space
of
CT; what
is
the
most
effective way
to
reduce
internal temperatures
within
a building.

• Able
to
make

refurbishment suggestions
to
reduce

• verheating.

We
can
design
climate
change
ready
buildings
! We
can
design
climate
change
ready
buildings
!

Design
is
climate
change proof
until
2080
under A1FI
projections. CT = 0.55 With
no
active
cooling!