passive housing by serena mehta 12-4. passive housing or passivhaus “a passivhaus is a building,...
TRANSCRIPT
PASSIVE HOUSING
By Serena Mehta 12-4
Passive housing or Passivhaus “A Passivhaus is a building, for which
thermal comfort can be achieved solely by post-heating or post-cooling of the fresh air mass, which is required to achieve sufficient indoor air quality conditions – without the need for additional recirculation of air.”
...meaning the heating requirement in a Passivhaus is reduced to the point where a traditional heating system is no longer considered essential.
global
‘passivhaus’ or passive house is a energy saving household- there are currently 20,000 in the world, most in german speaking places.
The Passivhaus Standard can be applied to any climate in the world and works equally as well in warm climates as it does in more moderate climates. To date Passivhaus buildings have been designed and built in every European country, Australia, China, Japan, Canada the USA and South America. Although it was origally designed for mid and northern European climates e.g. Germany.
energy
It reduces dependency on fossil fuels as there is a low heating demand of the buildings which is <15kwh per square metre per year. This also reduces heating costs which is essential in the current climate we are in due to the recession- A passive house typically costs slightly more to construct than conventional buildings, but energy costs can be cut by up to 90%.
The buildings have been proven not to fall below 16C without heating during cold winters as they have good insulation and low air infiltration rates.
A solution to the UK’s government target to reduce carbon emissions- In the UK, the Government has pledged that all new build houses will be 'Zero Carbon' rated by 2016 - a target that passive housing could help achieve.
Only uses 10% of the energy traditional housing uses.
Passivhaus
Link to broshure:http://www.ecoframesystems.com/administration/library/Documents/Eco-Frame-Systems-Brochure.pdf
What it includes:
Advanced window technologyWindows have exceptionally high R-values and usually combine triple-pane insulated
glazing with air-seals and thermally-broken window frames. Airtight constructionAir leakage through unsealed joints is less than 0.6 x the house volume per hour. Lighting and electrical appliancesLow-energy lighting and high-efficiency electrical appliances minimise energy use. Passive solar designBuildings normally have a reduced surface area with windows facing the equator. Space heatingPassive houses use intrinsic heat from internal sources - like waste heat from lighting,
white goods and electrical devices, and people's body heat. Super insulationThermal insulation materials reduce heat transfer through walls, roof and floor. VentilationMechanical heat recovery ventilation systems (with a heat recovery rate over 80%) and
high-efficiency electronically commutated motors (ECM) maintain air quality and recover enough heat to dispense with conventional central heating.
Passive House Design in the South EastAs experts in passive house design we can provide advice on constructing your home to
Passive House standards. We are happy to offer friendly advice, if you want to have a general chat about a project you are thinking about please do give us a call.
High levels of air tightness and insulation work equally well in protecting buildings from overheating provided there is adequate solar shading.
Controlled mechanical ventilation allows options to pre cool the supply air and also to humidify or de-humidify the ambient air depending on the relative humidity.
In combination these strategies are capable of significantly buffering the daytime temperature swing. Conventional cross ventilation through open windows and night purge ventilation strategies may also be used as part of the Passivhaus cooling concept when appropriate, such as during the cooler evening of a hot day.
Passivhaus regulations
Design Component- Limiting value Walls, Roof, Floor (U-values)-≤0.15 (W/m2K) Glazing unit-≤0.8 (W/m2K) Installed glazing-≤0.85 (W/m2K) Doors-≤0.8 (W/m2K) Infiltration (ach-1)-≤0.6 @ n50
Thermal bridging (linear ψ value)-≤0.01 (W/mK) MVHR coefficient (η HR)-≥0.75 Ventilation electric limit-0.45 Wh/m3
Appliances-High efficiency recommended Lighting-High efficiency recommended On site renewables-No requirementbut SHW typical
Global
Passive houses in the UK and Italy
http://www.info4fire.com/image/image_gallery?uuid=ff969b6e-04ef-450c-b3a9-f259af2e7c5d&groupId=10606&t=1276014958059
http://1.bp.blogspot.com/-kvJaXCz67NY/TbQYgzLvzdI/AAAAAAAAAB0/oTns778jXeE/s1600/passive-house_scheme.jpg
http://farm4.static.flickr.com/3392/3489234632_7c48189ea8_o.jpg
Contact info
[email protected] or 0845 873 5552. Postal Address
Eco Frame Systems Ltd Unit 1A Woolton FarmBekesbourneCanterburyKentCT4 5EA
Phone01227 831131
Fax01227 831147
Thank you for listening
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