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visitor experience

Chris Parsons

on 22 February 2015

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Transcript of wimbish

What is Passivhaus ?
an energy and comfort standard
primary energy demand
space heating and
cooling demand
heating load
Elements of
a passivhaus

high levels of
air leakage to below 0.6
air changes per hour
The avoidance of thermal bridging
The use of MVHR to provide constant fresh filtered air
The use of passive solar
and occupancy gains
Passivhaus in Practice

The principle is that the house retains all of the heat from occupancy, activity, passive solar gain and the like, and requires very small amounts of additional heating as necessary.

Fresh air is provided 24/7 by mechanical ventilation, (with heat recovery so as not to lose any heat)

Windows and doors are highly insulated and all internal surfaces are warm to the touch, including the glass, (generally around 17º)

Temperature is generally controlled by passive shading and window opening when necessary.

Air tightness reduces uncontrolled heat loss.
and nothing else
John Lefever
Regional Head of Development
Rural Housing Provider

Working in close partnership with Parish and District Council

Same principles applied as most rural Hastoe schemes
Differences for Passivhaus

Raising awareness through consultation – manageable target audience

Early nominations - Resident education

Buy in from residents – continuous support
2.5 year monitoring project sponsored by Technology Strategy Board

On site with a second project of fourteen homes in South Norfolk - 6% uplift, CSH4

Considering more schemes in future

Lessons learned will improve the sustainability of all our new homes
Taking it Forward

Innovation and how to communicate it
Detailed drawing package
Complete design before construction
Architect retained by client
Toolbox talks and site training
Emphasise and understand sensitivities
On Site
quality control procedures
procurement – no substitutes
reduced tolerances
breaking the ‘complacency’ chain
Air Tightness
Site champion with regular testing/inspection
Awareness and Understanding
increase through education
training and understanding
sequencing and timescales
build contracts
quality and quality control
Challenges for Construction
Passivhaus at

What is Passivhaus

Passivhaus in Practice

Passivhaus at Wimbish

Construction Issues

Challenges for the UK
Construction Issues
Challenges for the UK
Jane Keiller
Sustainability Manager
Now for the science bit…

Walls 0.090 W/m2/k
Floor 0.07 W/m2/k
Roof 0.0782 W/m2/k
Windows 0.79 W/m2/k

MVHR – 92% efficiency

0.46 Air changes per hour [n50]

Heating strategy:

Small individual gas boiler and solar thermal to provide heating coil in air inlet and rad/towel rail in bathroom, Large thermal store to avoid cycling and provide DHW

Walls 0.24 W/m2/k
Floor 0.16 W/m2/k
Roof 0.1 W/m2/k
Windows 1.4W/m2/k
Projected annual gas cost:

Houses 2478 kWh - £101

Flats 1390 kWh - £57
Addressing Climate Change
Rise of the Green agenda
UK target to reduce GHG emissions by 80% by 2050
In 2010, UK carbon emissions rose for first time since 2003
Code for Sustainable Homes
Government’s 2016 new build ‘route to zero carbon’ legislation
Escalating fuel prices and security of supply
Tackling Rural Fuel Poverty
In 2000, government set target to eradicate fuel poverty by 2016
Hills Report March 2012: new ‘reasonable cost’ definition plus measure of extent and depth of fuel poverty
Rural, off-gas, oil/solid fuel, solid walls = 50% of fuel poverty gap
Rural LIHC household have average fuel poverty gap of £622 vs £362 for urban households
Rural and off-gas have greatest fuel gap of all
4-fold increase in fuel costs predicted by 2020
Fuel poverty links with ill-health.
Sustainability and Innovation
Carbon assessments 2010
Retrofit focus
Green Homes Standard
Switching to gas and insulation
Retrofit exemplar learning: heat pumps, PV, solar thermal
Incentives: FITS/RHPP/Green Deal
Next Passivhaus development at Ditchingham
Construction with straw bales
Sustainable Homes Ltd
SHIFT Silver accreditation
Why Passivhaus
Low carbon building standard – combined with CSH
Low tech ‘passive’ measures with little intervention from residents
High energy efficiency
Low energy bills and high comfort for residents
Drive down build costs, replicable across sector
Chris Parsons
Building Consultants
Passivhaus Consultants
CSH Assessors
Energy Assessors
Thermal Modelling
Planning Consultants
Full transcript