Designing for Resilience Green Architecture Day: Health ...
Transcript of Designing for Resilience Green Architecture Day: Health ...
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Designing for Resilience
Green Architecture Day: Health and Buildings
5th April 2014,
Sallis Benney Theatre, University of Brighton www.brightonpermaculture.org
Professor Susan Roaf Professor of Architectural Engineering at Heriot Watt University, Edinburgh,
Email: [email protected]
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What Does a Building Do?
Swiss Chalet Aborigine Home
Ghadafi’s House Hirst Castle
Keeps you Warm Keeps you Cool
Demonstrates a Style Shows How Rich You are
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How warm / cool does it have to keep you ?
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Source: Nicol & Humphreys 1972
Mechanisms to keep body temperature constant at about 37oC
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1) The physics
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2) The physiology
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3) Behaviour is also an essential component
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1 kW/m2 Short Wave
Radiation from the Sun
RADIATION
RESPIRATION
EVAPORATION
35ºC
25ºC
CONVECTION
Wet Air
Dry Air
Heat Exchange of the Body
with the Environment
Courtesy Max Fordham 8
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Picture:
Sab
Ventris
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What is the perfect temperature for tea?
What is the function of a Tea Pot?
?
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Tea Pots: The Basic Principles
? Milk in First to Keep it hotter?
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Delta T The difference between the
Tea and the Air temperatures
MIF wins
Tea Pots: The Basic Principles
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Chairs: Theory and Practice
Which Chair is most thermally comfortable ?
Which Part of Your Chair is warmest ?
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Chairs: Conduction They all have the same surface temperatures
the materials conduct the heat away from your hand at different rates
Overcoats for Chairs ?
The Rate of Heat Loss is Key
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? Which is the Best Tea Pot Material ?
What WORK does a Teapot do ?
Tea Pots: The Basic Principles
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TEA POT WORK
Moves Hot WATER from Kettle to consumer and
Allows WATER to be poured into a Cup but
Stops WATER and ENERGY from escaping and
Stores the Heat ENERGY till it is needed
M A S S
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Tea Pots: Radiation
? Xxxxxxxxxx
Xxxxxxxxxx
How do you keep the tea in these glass pots hotter for longer ?
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? Fill them up
Heat them With a candle
Remove the cold bridge
Insulate them
Tea Pots
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? How did they keep tea hot in a silver teapot hot ?
Tea Pots: The Basic Principles
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Regularly top it up From a heated
Samovar
Heat it constantly Over a flame
Place an insulating tray beneath it
Make the whole Pot heavier and
Warm the pot first
Tea Pots: The Basic Principles
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Tea Pots: Emissivity
Surface Material Emissivity Coefficient
- ε - Surface Material
Emissivity Coefficient
- ε -
Black Body Matt 1.00 Iron polished 0.14 - 0.38
Black Enamel Paint 0.80 Marble White 0.95
Cast Iron, turned and heated 0.60 - 0.70 Mild Steel 0.20 - 0.32
Concrete 0.85 Porcelain, glazed 0.92
Concrete, rough 0.94 Silver Polished 0.02 - 0.03
Concrete tiles 0.63 Stainless Steel,
polished 0.075
Copper Polished 0.023 - 0.052 Water 0.95 - 0.963
Glass smooth 0.92 - 0.94 Wood Beech, planned 0.935
Glass, pyrex 0.85 - 0.95 Wood Oak, planned 0.885
Ice rough 0.985 Wood, Pine 0.95
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http://www.ips-innovations.com/new_paints_ref.htm
Tea Pots: Emissivity
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EMISSSIVITY
New Low Emissivity Wall Paints which keep the heat in the house during winter and keep it out in summer. The right side of the wall behind this heater is painted with a low-e wall paint, which reflects part of the heat back into the room before it is lost through the wall. In the winter a low-e wall paint on an inner wall decreases heat loss. In summer on an outer wall it reflects heat back into the environment saving energy. (www.sova-online.dewww.thermalin.de
http://www.ips-innovations.com/new_paints_ref.htm
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Story - Calorific Cascades – Dynamic Environments
Abra Kadabra …….
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Complex Thermal Landscapes in Rooms
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Vedara Hotel Las Vegas 2010 London 2013The Cheese Grater
AVOID DANGEROUS BUILDINGS
Avoid Dangerous Architects
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So how do you keep tea hotter longer in a
ceramic tea pot
?
Tea Pots: The Basic Principles
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Best Form: Minimise the Surface Area
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Tea Pots: Insulation
Heat Pot first Fill it up
Insulate it Heat it
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Tea Pots: Convection
?
Cold Bridging Problems ? Maximising heat loss
From exposed surfaces ?
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Tea Pots: Buildings
Meis - Glass and Metal
Corb – suspended Concrete
Traditional – cosy - sheltered
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Different Pots for Different Climates ?
T
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Incre
asing T
ime la
g
Increasing Time lag
5o-10
oC temperature differences found in different rooms in the same house
Source: Jane Matthews
o
S N
Shade
Hot Zone
Cool Zone
Different Pots for Different Places ?
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34 The Delta T Effect
T
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Understanding Time: 24 Hour Thermal Histories of Yazdi Housewives
Sunrise on the roof
Ground floor courtyard
Basement
With
Windcatcher
Basement
Without
Windcatcher
Sunset
Up to Bed
on the
Roof
Resting
Cool room
Sleeping
Warm
blankets Seated
Cool breeze
Radiation to sky
Active
Shade
People, Buildings and Climate in
Dynamic relationships
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Palermo-Punta Raisa
19.00
20.00
21.00
22.00
23.00
24.00
25.00
26.00
27.00
28.00
29.00
30.00
01/0
6/2
002
08/0
6/2
002
15/0
6/2
002
22/0
6/2
002
29/0
6/2
002
06/0
7/2
002
13/0
7/2
002
20/0
7/2
002
27/0
7/2
002
03/0
8/2
002
10/0
8/2
002
17/0
8/2
002
24/0
8/2
002
31/0
8/2
002
07/0
9/2
002
Tem
pera
ture (
oC
)
Daily mean outdoor temperature (To)
Running mean temperature (Trm)
Comfort temperature
ISO7730 summer
prEN 15251 ASHRAE 55
Palermo-Punta Raisa
Brazil
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The snug
The Veranda Warm Sunny Kitchen
Cold Kitchen
Different choices for season, places, people and occasions?
T
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We do need to train Architects to be part of the Solutions Not be the problem …..Fit for Purpose in a Changing World
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Which is the Best Tea Pot ?
Answer = It All Depends what Work it needs to do And how many ‘Adaptive Opportunities’ are available
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Can we adapt Teapot thinking for other Uses?
YES
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BUILDING WORK
Moves HEAT or COOLTH from where it is made
to where it is needed
Stops HEAT OR COOLTH from entering or
escaping
Stores HEAT or COOLTH till it is needed
M A S S
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1st Important Decision: Solar Orientation
Winter
Heat
Engine
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Traditional Norwegian Log House
What is your Major Climatic Design Strategy?
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2nd Important Design Decision: Building Form
Hot Air Lock
Cold Air Lock
Minimum Surface To Volume Area
Warm Core Coupled to the Stove Radiator
Calorific Cascade
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3rd Important Design Decision: Envelope Choices
No West Facing Windows – reduced heat gain
Large glass windows into hot airlock only
All non-airlock windows – reasonable size
No cold bridges – even in floors
S
H
A
D
I
N
G
NW cold
Wind no
Glass in
Porch
Raincoat
Overcoat
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Radiator
Radiator
4th Selective Cooling Ventilation Strategies
Stack Ventilation In Hot Spells
Good Cross ventilation flow
Winter
Summer
Hot Spell
Hot Spell
C
O
O
L
E
D
A
I
R
F
R
O
M
G
A
R
D
E
N
C
O
O
L
E
D
A
I
R
F
R
O
M
G
A
R
D
E
N
Warm Flue
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Opening Doors and Windows in mid-winter
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What Else Does a Building Do?
Much More than a Teapot
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What sweeps through a building ? Sound Water Energy People Sight
S W E P S
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Raincoat Overcoat
Water, Energy, Sight – Move / Allow / Stop / Store
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Student Halls – Complex Iinks through walls to Ecosystems
Sound Light Energy Sight
Heat Loss Stop
View Allow Heat Loss Allow
View Stop Light Allow
Noise Stop Noise Stop
View Stop View Stop
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GOOD BUILDING
Good Adaptive Opportunity
OK BUILDING
Limited Adaptive Opportunity
BAD BUILDING
No Adaptive Opportunity
Shading
Shutters
Nat vent
Curtains Shading
Nat Vent
This Building needs a machine to function
BUILDING FUNCTIONALITY: Adaptive Opportunity – using a wide range of Materials Dynamically Diurnally and Seasonally and Occasionally
SLOW BUILDINGS …..
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30ºC
15ºC
Day Day Night
High Thermal Mass Building in Summer
Arup Research:
Embodied and In-Use CO2
Emissions from Housing Energy Storage – Dampens Peaks
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19 C. Product
Opportunities
Flock Wall Paper
Heavy Mass Chimney
Wet Plaster Finish
Light reflecting
Mirrors
Nick Nacks – mass
Screens
Ceramics - mass
Wood / Coal
Expensive Chairs
Carpets
Thanks to: Francisco Lozupone
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Inappropriate Architecture for an Energy Austere Future ?
Heavy house but heat is sucked out by draughts House solid but needs work
Most Efficient Heat Storage
Not Necessarily
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Source: Edward Arens, UC Berkeley, Windsor Conference 9-11 April 2010.
Personal Environmental Controls: PETs
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New Seoul: from the film ‘Elysium’ 2013
Guji Myeon, Dalseong County, South Korea Solar Valley, Dezhou, China
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2100 ?
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Figure 2. The extreme summer of 2003 may well occur ever second year by 2030 and by 2050 will be a cool year. This figure shows the
June-August anomalies (relative to 1961-90 mean in K) over the region shown inset. Shown are observed temperatures (black line, with
low-pass-filtered temperatures as the heavy black line), modelled temperatures for four HadCM3 simulations including both
anthropogenic and natural forcings to 2000 (red, green blue and turquoise lines), and estimated HadCM3 response to purely natural
forcings (yellow line). The observed 2003 temperature is shown as a star. Also shown (red, green and blue lines) are three simulations
(initialized in 1989) including changes in greenhouse gas and sulphur emissions according to the SRES A2 scenario to 210022. The inset
shows the observed summer 2003 temperature anomalies in K).
Nakicenovic, N. and R. Swart (2010). Special Report on Emission Scenarios, Cambridge University Press, Cambridge, UK.
The EU Heatwave 2003
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January 2014 Flooding : destroying Infra-structures
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January 2014 Flooding : destroying Lives
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BRITTLE ENERGY SUPPLY SYSTEMS
REQUIRE MORE RESILIENT BUILDINGS AND MATERIALS FOR A VERY DIFFERENT FUTURE ? YES OR NO ?
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Rapid Changes in the Building Sector
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PASSIVE HOUSES: 1990s
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http://passipedia.passiv.de/passipedia_en/_detail/picopen/gemessene_sommertemperaturen.png?id=basics%3Asummer
Passive Houses and Overheating
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Passive House: Energy Efficient Approach
• Insulation
• Good Windows
• Air Tight
• No thermal bridging
• Heat Recovery
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ENERGY- Contributes positively to the energy balance of the building
INDOOR CLIMATE - Creates a healthier and more comfortable life for the
occupants
ENVIRONMENT - Has a positive impact on the environment
The Active House, yet another green building standard, comes to North America:
ACTIVE HOUSE: 2000s
http://www.treehugger.com/green-architecture/active-house-yet-another-green-building-standard-comes-north-america.html
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Andrew Purcell, The Guardian, Thursday 21 May 2009
Zero-carbon eco home is light years ahead The dream of zero-carbon living is being realised on an estate in Denmark.
Andrew Purcell takes a tour of the world's first Active House
‘Conceived as a more comfortable and user-friendly response to the Passive House, which has set the standard for sustainable living in the last decade’
http://www.theguardian.com/environment/2009/may/21/active-house-denmark-zero-carbon
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Active House: The Environmental Approach
• Insulation
• Good Windows
• Air Tight
• No thermal bridging
• Heat Recovery
• Thermal Storage
• Natural Ventilation
• Adaptive Envelope
• Active solar systems
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Energy to Store
Energy store
THE RESILENT HOUSE
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Future-Proofing through Resilient Design www.resilientdesign.org
Meeting the Needs of a new generation of PROSUMER Clients With buildings that Generate and Consume Energy
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20th Century Buildings Poor Climatic Design – Unaffordable – Without Cheap
Energy
throwing energy away is not longer an option
Building is Not a box
The solution is Not a machine
We are connected To the climate
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LEED Platinum / BREEAM / Energy Star Excellent Driving change or Business As Usual ?
Is the Solution a LEED Building like these? NO
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21st Century Buildings
Design for People
Design with Nature
And Climate
Time Place
Architecture
Solar
Energy
WITH
Buildings run on
Renewable energy
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20thC buildings were designed in an Age when Energy was dreamed would be ‘Too Cheap to Meter’
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Not for a Future of soaring energy costs?
Global Oil Production, Consumption and Price 2001 - 2012 http://www.eia.gov/ers
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And Disappearing Middle Classes?
The US Census in 2012 evidence of the widening income gap between the rich and poor, prolonging the trend of the last 40 years http://www.eia.gov/ers
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There are lots of new Opportunities - like new ways of doing Work ……..
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New Ways of Powering Buildings and Cities
All different All appropriate
Australia USA Japan
China
Brazil
Germany
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10
20
30
40
50
2000 2010 2020 2030 2040 2050 1990
Carb
on
dio
xid
e e
mis
sio
ns
(M
tCO
2)
Draft London
Plan targets
15% 20%
25% 30%
60%
Today
(+0.7° C already)
60%
90%
New
evidence?
2025
Buildings will increasingly be driven by Targets
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And by Markets..
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And the Changing World around us
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Tea Pot Wisdom
?
Apply the underlying principles wisely
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T0C
?