Energy and water saving retrofit

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					   Energy and water saving retrofit

§ Energy saving retrofit informed by GBS
experience of the Passivhaus standard
and methodology
§ Water saving retrofit informed by GBS
experience and water saving products

Nell Griffiths
Services Department Manager


   www.greenbuildingstore.co.uk
  Energy and water saving retrofit

§ Passivhaus    why and what?

§ Passivhaus and retrofit

§ Retrofitting for water saving

§ Resources and information
  Energy and water saving retrofit

Solutions must be:

§ Cost-effective

§ Sustainable

§ Robust, tried and tested

§ A real solution    no greenwash or bling
Passivhaus low energy
 Climate change is for real. We have just a small
window of opportunity and it is closing rather rapidly.
There is not a moment to lose.

Rajendra Pachauri,
Chair IPCC 2005


   . we are now close to a point where if we don't
begin to reduce the emissions rapidly then we're going
to have to figure out some way to suck the CO2 out of
the atmosphere I think, this decade really is our last
chance.

James Hansen
NASA 2011
 and

Buildings in construction and use
are responsible for around 50% of
all UK carbon emissions.
         UK CO2 emissions mt*




               *excluding flying
               Source: AECB
     Energy - principles
§ Fabric first
It is more cost-effective and a more robust and reliable
solution to ensure that the fabric of the building effectively
retains heat. All other measures are secondary.


or putting it another way

§ Negawatts not megawatts
 Energy efficiency is the great new energy resource of our
future and a vital key to a sustainable environment."
Amory Lovins 1989
Rocky Mountain Institute
So to achieve low energy, low carbon buildings our
priority is


1. Low energy building fabric
..and Passivhaus is the most effective approach

Only after this should we consider


2. Low carbon energy input
Micro-renewables such as solar, wind if they can be
    shown to be effective
   Why Passivhaus?
 I was working as a physicist. I read that
the construction industry had
experimented with adding insulation to
new buildings and that energy
consumption had failed to reduce. This
offended me it was counter to the basic
laws of physics. I knew that they must be
doing something wrong. So I made it my
mission to find out what, and to establish
what was needed to do it right.

Professor Wolfgang Feist
Founder Passivhaus Institut, Germany           PASSIV
                                              HAUS
                                             INSTITUT
                                             Dr Wolfgang Feist
The first Passivhaus, Darmstadt, Germany, 1991
        Passivhaus a comfort standard
        and an energy standard
§ No draughts
§ No cold radiant
§ No summer overheating
§ Fresh air always
§ Whole house warm - no
  hypothermia
§ Fuel Poverty eliminated

- all by simply improving the
   build quality
Passivhaus a comfort and
energy standard
                                  Comfort
Air-tightness   0.6ach @ 50Pa
Surface temp    >17degC           Comfort
(windows)
Summer          Max 10%
                                  Comfort
overheating     >25degC
Vent            ~30m3/hr.person   Comfort
Heating         15kWh/m2a
Primary Energy 120kWh/m2a
                                   Energy

                                   Energy
 Why is Passivhaus important?
§ Need for urgent and effective action
§ Timescale for action is too short to reinvent
  the wheel
§ Cost-effective
§ Fully developed methodology
§ Proven to work in practice
§ Long track record over 20,000 Passivhaus
  buildings worldwide
§ Extensive monitoring...it works!
    ...because it works!

Do they really deliver?

                       PHPP calculated
                       results
 What does it deliver?

§ Around 90% reduction in
energy use compared with
average German or UK
building stock
§ Around 75% reduction
compared with 2006
Building Regulations
       And not just houses....
§   Factories
§   Laboratories
§   Offices
§   Schools
§   Training centres
The Denby Dale Passivhaus
www.denbydalepassivhaus.co.uk
 Passivhaus retrofit
Same principles can be applied
§ Super insulation
§ Optimisation of passive solar gain
§ Minimising thermal bridging
§ Stringent airtightness measures
§ Mechanical ventilation with heat
  recovery (MVHR)
 Passivhaus EnerPHit standard
§ EnerPHit standard for domestic refurbs in
pipeline, with potential to extend to non-
domestic refurbishments

§ Space heating demand and airtightness
requirements relaxed slightly to reflect
difficulties in retrofitting

§Potential 80% energy reduction
Lena Gardens
The UK s first certified Passivhaus retrofit




 Low energy buildings database - www.retrofitforthefuture.org
Grove Cottage, Hereford
Low energy buildings database - www.retrofitforthefuture.org
 Guidelines
§ Use PHPP software to design beware of
  imitation
§ Whole building strategy
§ Passivhaus components needed
§ External/ internal wall insulation usually
  needed
§ Tea cosy effect of minimising thermal
  bridging look at junction detailing
  Passivhaus resources

§ www.retrofitforthefuture.org

§ www.greenbuildingstore.co.uk

§ www.passivhaustrust.org.uk
Water saving
   Why low-flush WCs?
§Painless
  §but only if
     §The pan is cleared
     §The drain doesn t block
     §The mechanism is robust
    ES4: the features
§Ecofil valve - 4 litres means 4 litres
§Pan design for perfect clearance
§High after-flush volume
§Robust siphon flush
Testing a toilet for leaks
     Leaking toilets
 How can I fix my leaking toilet?
My cistern is a modern push-button flush model.
It dribbles down the back of the pan, at varying
rates, all the time. Even when the loo has just
been flushed. I have several friends with the
same problem. Is it a design fault or can it be
fixed?
Desperate of Emsworth.

                            Jeffers - August 2007
Why use a siphon?
AirFlush® urinals
   AirFlush® urinals
§Innovative technology
§No consumables
§Minimal running costs
§No odour
Bus stations
Bus stations

§Green Building Store s water saving range
installed at 3 Metro bus stations in West
Yorkshire with more in the pipeline

§Water use cut by up to 40%

§Huddersfield bus station saves £7.5K a year
(£6.5K through water saving and £1K in
washroom maintenance savings)
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Dec-07
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                                    Series2
                                              Series1
   Tap regulators
§How is the hot water supplied ?
§Do you need a basin or a bucket?
In-line regulation
   Washroom range




www.watersavingwashrooms.co.uk
  Funding support
Carbon Trust loans
funding for products (including
  insulation)
www.energyefficiencyfinancing.co.uk


Enhance capital allowances
 Water Technology list
 Energy Technology list
  Thank you.

Nell Griffiths
nell@greenbuildingstore.co.uk
Tel: 01484 461705

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posted:9/27/2011
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