DVPF Canolfan Hyddgen

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DVPF Canolfan Hyddgen

• Passivhaus
• Offices
• NASEG
• March 3rd 2009

• Passivhaus Offices
• NASEG
• March 3rd 2009

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jpw Construction Ltd
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jpw Construction Ltd Sustainable
Architectural Design Passivhaus Consultancy
Construction Carbon Neutral Solutions
John P. Williamson
 

Licensed Assessors JPWC-ECO-JW13

• 6 Vane Hall Place, Hoel Pentrerhedyn
• Machynlleth, Powys, SY20 8DQ , UK
• Tel [phone]
• info_at_jpwconstruction.idps.co.uk
• www.jpwconstruction.idps.co.uk

SA-COC-0975 JPW
jpw Construction Ltd
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Contents Project Drivers Certification Passi
vhaus concept principles Design details
construction method Carbon neutrality Post
occupancy evaluation Challenges to Passivhaus
construction in Wales
 
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Dyfi Valley Path Finder (DVPF) WAG/PCC Funded
Scheme Property Rationalisation Reduce energy
consumption, fuel bills overheads Maximise
revenue through design and management Strategy
for multiple tenancy Community use Reduce
Carbon Footprint Client requirement PHI
Passivhaus BREEAM Excellent Certification (First
time In UK that both standards have been applied
simultaneously)
 
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BREEAM CSH Principles A Range of
Sustainable issues Targets Management Health
Wellbeing Energy Transport Water
Materials Waste Land Use Ecology Pollution
 
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Passivhaus Concept Principles Passive Houses
are buildings in which the space heat
requirement is reduced by means of passive
measures to the point at which there is no
longer any need for a Conventional heating
system The air supply system essentially
suffices to distribute the remaining heat
requirement Minimizing heat loss is
fundamentally more efficient than strategies
relying primarily upon passive or active solar
use The space heat demand for a house in the
cold season is the major energy consuming
service. Reduce investment through energy
efficient design
 
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Principle Energy Targets The space heat
requirement of a Passivhaus must not exceed 15
kWh/(m²a). This is less than one fifth of the
energy requirement mandated by the building
regulations currently in force in the
participating countries. Total Primary Energy
Use (Appliances, lighting, Ventilation, Pumps,
DHW) must not exceed 120 kWh/(m²a). Lower than
average consumption of European new build by
factor of 2 to 4 Maximum Heat Load 10W/m2 New
Build to UK Building Regs averages 100W/m2
 
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Energy Savings comparison German Housing Stock
Standards
 
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Basic 5 Elements First 3 are crucial to Passive
House Concept Space heating _gt 15 kWh/(m²a).
Super Insulation Exceptional thermal envelope
preventing thermal bridging and air leakage _gt
0.6 h-1(40 factor lower than EU best) Combining
efficient heat recovery with supplementary
supply air heating Optimized continuous supply
of fresh air. Excellent indoor air
quality.Supplementary air heating when required.
Subsoil preheat pipes further reduces need for
supplementary heating Passive Solar Gain Windows
dimensioned to provide adequate daylight will
provide approx 1/3 of minimized heat demand via
solar gain. Triple low emissivity glazing in
superinsulated frames produce a positive energy
balance. Enhanced by Un shaded south orientation.
 
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Air tightness DVPF n50 0.249 -1 _at_ 50Pa
(passivhaus requirement is 0.6) Q50 0.37 m3
/(h.m2 ) _at_ 50Pa (UK measurement) Air tightness
Standards Comparison for UK L2A UK Assumed air
leakage provided TER is achieved using NCM
(under 500m2) q5015 m3 /(h.m2 ) _at_ 50Pa UK
General non domestic domestic q50 10 m3
/(h.m2 ) _at_ 50Pa UK best practice for
mechanically ventilated q50 3 m3 /(h.m2 ) _at_
50Pa EST Advance Practice q50 1 m3 /(h.m2 ) _at_
50Pa
 
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Ventilation System
Auxiliary heat load to top up Solar Internal
gains at times of peak load (e.g. Mid Winter)
are calculated. This Auxiliary load is very low
and and is often only needed for 4-5 months a
year in winter. Common solutions include Gas,
LPG, Oil boiler Bio fuel - wood pellet / wood
chip boiler or stove Electric Heaters in ductwork
Compact Ventilation units The above methods are
often combined with pre heat ground pipes, heat
stores SHW systems
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Basic 5 Elements 4 5 are necessary to fully
minimize Energy Consumption and CO2
emmissions Primary Energy _gt 120 kWh/(m²a). 4.
Electrical efficiency means efficient
appliances Fit Passive Houses with, efficient
appliances, hot water connections for washing
machines dishwashers, airing cabinets, CFLs
DC motor ventilation systems. These measures
greatly reduce energy consumption without any
loss of convenience or comfort. 5. Meeting the
remaining energy demand with renewables Cost
optimized Solar thermal systems can meet approx
40-60 of low temperature demand for
DHW. Minimized remaining energy consumption (DHW,
Space Heat Electricity) can be met by cost
effective renewable sources. Outcome is
affordable autonomous carbon neutral buildings
 
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Design Detail Elements must be combined
considered in detail to produce a holistic
outcome depending upon
 
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Local Building Traditions Passive house
Construction Method in Germany 70 Masonry 15
Concrete 15 Timber Passive house Construction
Method in Austria 80 Timber Frame 20 Concrete
Masonry Successful Passive Houses adapted to
traditional regional construction practices and
vernacular styles
 
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The Specific Climatic conditions Specific PH
solutions must be adapted for each territory and
climate under consideration. Differences in
solar gain thermal mass being the main Reason.
In other regions, other energy services, like
cooling or dehumidification, could be of greater
importance than heating. Passive House solution
can be soundly applied independent of the
geographic and climatic circumstances with
careful planning.
 
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Economies of Scale Supply Chain Extra build
costs for PH Standard in Netherlands (8-12) are
higher due to fewer projects. Similar costs are
likely to be experienced initially in the UK.
Import costs and unfamiliarity tax German
Austrian experience has shown that initial 10
increase in costs reduced to 0 - 4 as supply
chain of components/materials and network of
contractors and Architects increased. Built to
PCC standard costs per m2 for a school
 
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Carbon Neutrality
 
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Carbon Neutral Passive House Kronsberg
Development - Hannover   Aims To substitute
over the annual balance the entire remaining
primary energy requirement, or the associated CO2
emissions, through a share in a wind power
facility planned nearby. Test the acceptance of
a corresponding mark-up on the purchase price of
a house, i.e Share premium To identify the
precise level of the necessary share. In
Practice the mark- up of Euro 1,278 presented no
marketing impediment at all.
 
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Reducing Primary Energy Demand Survey of 150
Households reason for choice 51 Personal
environmental convictions 16 Encouraged to do so
by Architect 12 Due to location of
development Space heating demand similar for all
occupants. House design limits use of energy
resulting CO2 However 51 who bought due to
personal convictions had a much lower primary
energy. (Energy Awareness)
 
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Reducing Primary Energy Demand Change the house,
the person energy supply? Successful design
standard of construction 88 Occupants would buy
a Passive house again High level of satisfaction
personal Comfort 33 Very good - 55 good -
9 satisfactory Only a small were able to
evaluate their levels of personal primary energy
consumption
 
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Reducing Primary Energy Demand Increase personal
energy awareness. Detailed introduction on use
of passive house visual energy
meters. Dedicated low flow DHW devices low
energy lighting appliances - but very personal
choices. Build Carbon Neutrality into the
development. Dedicated on site renewables or
local renewable share schemes.
 
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Challenges to Passive house Construction in
Wales
 
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• Planning, Construction Regulation Framework
• Planning / Bldg Regs / Conservation conflict
• Availability of building products
• Calculation methodologies existing standards
• Heating systems to meet lower heating demand
• Consumer aspirations they expect central
  heating and want fireplaces
• Previous voluntary certification schemes have
  failed.

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• References Acknowledgements
• E.Mlecnik, PHP
• PEP
• BRE
• CEPHEUS
• PassivHaus Institute Wolfgang Feist/Berthold
  Kaufmann
• David Olivier Energy Advisory associates
• AECB
• Franz Fruendorfer IZF
• Thomas Knecht
• S-House
• Optwin

Cepheus at
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