Download feature - CAT Education

This table gives some detailed information on the buildings illustrated in the powerpoint - Sustainable buildings - 5 examples
* Thermal transmittance, also known as U value, is the rate of transfer of heat (in watts) through one square metre of a structure
divided by the difference in temperature across the structure. It is expressed in watts per square metre per kelvin, or W/m²K.
The lower the U value figure the better the performance in keeping heat in.
Feature
St Lukes
WISE
U value
roof
(Unit is
W/m2K)*
U value
walls
U value
floor
Thermal
mass
0.09
0.09
lecture theatre 0.09
terrace 0.14
North 0.11
South 0.12
0.12
0.14
0.16
Type of
window
Triple glazing in timber
frame
Some double glazed doors
Coloured film on clerestory
glazing for aesthetic effect.
U value = 1.1
High performance double
glazing:
Soft low-e coating, argon fill
and insulated edge spacers
in FSC redwood/oak frames.
U value = 1.1 to 1.4
Materials
general
All timber or tree products lino and rubber flooring,
recycled carpet
matting from car tyres
natural organic paints and
oils
Cedar shingles
Local, low embodied energy
natural organic paints and
oils.
Slate from CAT site and
Blaenau.
Where possible, indigenous
materials and labour have
been used
Responsible Sourcing and the
Green Guide
Various, including 0.5mm
stainless steel
Hemp/lime, Warmcel, perlite
and cork
Internal - rammed Earth and
earth blocks,
External- 500mm hemp/lime
cast around timber frame
Aluminium
Sedum roof to north and
reused slate and PVs to South
High level
warmcel
Material
roof
Material
insulation
Material
walls
Senedd
Canolfan Hyddgen
WAG
Aberystwyth
012
High thermal mass with earth
walls (rammed and pre-made
blocks)
Recycled cellulose
High levels
UK grown Douglas Fir
cladding
Timber frame – glulam in
larger spaces
In-filled with Pre-fabricated
Exposed concrete slabs
utilised for their thermal
mass
Extensive use of slate
Concrete floors and blockwork
internal walls
Recycled masonry core
Triple low emissivity glazing in
super insulated frames
Mainly slate and glass
Yes
In structural soffits
Timber
timber panels
Douglas Fir, glulam
Cement
Glulam and solid, all FSC
Oak, cedar, larch, ash,
whitewood
From Wales and
Scandinavia
Very little, mostly lime
Daylighting
Maximised
North facing clerestory
windows
Maximised
Skylights, lots of windows,
various sizes
Lighting
Energy efficient –
automatically adjust to
ambient light
Passive
Classrooms cross-ventilated
– manual low level windows
and automatic clerestory
Natural wind flow
LED and fluorescents, some
automatic controls
Passive
solar
Carefully controlled.
Large canopy along South
facing classrooms provides
extended tchg space and
shade from summer sun
Glazing to south face of
corridor around Earth wall
lecture theatre.
Bedrooms face south.
Siting
Open site
Not ideal for solar
Ventilation
Solar water
heating
no
Water
heating
Natural, stack, controlled
Mechanical ventilation kept
to a minimum
No air conditioning
External solid timber frame –
local and FSC
Concrete slabs utilised for
their thermal mass
Concrete floors and blockwork
internal walls
The funnel, wind cowl and
lantern are key to
ventilation and lighting in
the Siambr
A lot
Lack of glare on computer
screens etc.
natural ventilation
The Siambr, Committee
Rooms and associated
public viewing galleries are
serviced by a mixed-mode
ventilation system, which
offers both natural
ventilation and airconditioning
Lighting controls
T5 fluorescent tubes
Daylight dimming
Mechanical cooling
“stack” ventilation
via the atrium
mechanical vents
at ground level
Lots of south facing glazing –
great for solar gain in the
winter – 1/3 of heat demand
Brises-soleil added
Access corridor between
south glazing and most
teaching rooms
Mid-wales is mild but solar
gain is lower than many areas
of Britain
Unshaded south orientation
70m2 evacuated tubes to
provide much of the hot
water for the ensuite study
bedrooms
Point of use instant gas
Southerly
orientation
yes
Heating
system
PVs
Underfloor
Biomass woodchip
Gas back-up
no
100kW (electrical) wood chip
combined-heat-and-power
plant
back-up gas
underfloor heating
earth heat exchangers,
coupled with heat pumps
The boiler installed has the
ability to process both wood
chip and pellets.
60m2, 6.58KW peak
7kWp
Generate 5987kWj/y – ¼ of
the building’s electricity use
Intend to add 20kW
Wind
turbine
Monitoring
Feedback
Simple cartoon guides of
how things work in every
room
Minute by minute monitoring
and feedback of energy and
water consumption
Thorough consultation
before with parents,
teachers, children and
governors
Head says ‘Children and
staff are keen to work; they
love their new learning envir
Pupil – ‘a happy building
that smiles at you’
Water use
Size /
function
Location
visual etc
Detailed record of
construction, energy and
water in use.
Electricity and heat energy
use
Monitored and can be
controlled from County Hall
Extremely positive from all
users.
Centre administrator says
stays cool on hot days in the
summer
She explains to users how the
building works
The building was warm
enough through Wales’
coldest winter for 30 years
Low flow taps and toilet
systems.
438 pupil primary school
2911m2
Efficient heat recovery system
85% reduction in space
heating
Gas
Subsoil pre-heat pipes
200 seat lecture theatre, 4
teaching rooms, 3 seminar
rooms, bar, 24 bedrooms,
restaurant extension
office space for 20,
roof terraces
Visual impact reduced by
being tucked partly into the
slate tip at CAT.
Rain water harvesting.
Water is collected primary supply for flushing
the WCs, irrigation and
maintenance. (& water
saving devices)
Waterless urinals and low
flush loos and leak detection
410m2
4 training rooms, day and
evening classes inc
computing, receptn for the
Sch, front of hse cncl servs,
free int access +
Important
Key location facing Cardiff
Bay
District biomass
system
Yes
Also policy to buy
green electricity
Rainwater
harvesting
Water efficient
fittings
ecology
Community
/public
Cost
Breeam
Sustainable Urban drainage
systems
Maximum number of trees
retained on the site
Community use in the
evening and weekends for
courses and other
Permeable paving
bat rehab
sedum
Open to day visitors to site
whenever possible
Symbolises an open
democracy and public
accessibility
BREEAM excellent
Principles –
Sustainable materials
Community involvement
Using building as a
curriculum resource
Predicted CO2 emissions of
8.8kg/m2/y
St Lukes
WISE
Senedd
Faithful and Gould’s benchmark for educational buildings is £1711/m2
Council office
Evening classes and meetings
£1784/m2
BREEAM excellent
1st public sector building
certified by the Passivhaus
Institute
Annual primary energy use of
112kWh/m2/yr – below
passivhaus target
Shut everything down at night
with mechanical timers
Annual heating bill £127
Can H
WAG Aber