LEBD - CRIT ONEZero-Carbon Rural Home Development

Mark Horgan – SAE Mark Lewis – SAE Grant MacGregor – SAE Darren Tannock - SAE Etienne Hentzen - ME

GROUP MEMBERS

ZERO-CARBON RURAL HOUSE

• The Rural Development was chosen.

More freedoms of geometry

More challenging design owing to restrictions

ANALYSIS OF BRIEF

Information from brief:– family home for 4 (adults + children)– 4 bedrooms– home office (adults work from home)– 2 bathroom/toilet– net zero-energy home– Electric vehicle required– No gas grid access– Max grid demand 20kW

REQUIREMENT BREAKDOWN

Factors for making a net-zero home: Building and room Geometry - Darren Lighting and Ventilation - Etienne Energy Systems - Mark Demand Reduction – Other Mark Renewable Energy Systems – Grant

DATA ANALYSIS

To help define the requirements of the building, environmental factors of the surrounding area were researched.

These environmental factors include: Average daylight hours Average wind speed & direction Average temperature Average rainfall

SITE LOCATION

Location on peak of small crest.

Landscape generally slopes downwards towards coastline to the WSW.

CLIMATE DATA OVER PERIOD 1971-2000, TAKEN AT AUCHENCRUIVE, 19KM SOUTH OF SITE.

WIND (HTTP://WWW.METOFFICE.GOV.UK/CLIMATE/UK/WS/PRINT.HTML)

Average wind data taken at Prestwick Airport shows predominant wind direction is WSW, ranging generally between WNW and S. This is consistent with the location of the site relative to the Ayrshire coastline where the predominant Gulfstream blows in from.

GEOMETRY

Main Bathroom

Bedroom 2

Bedroom 3

Bedroom 4

W/C Master Bedroom

OfficeKitchen / Living Area

Design of the house was predicated on these factors: North & South orientation for maximum sunlight Longer East & West than North & South Bungalow design for disabled access and in keeping with

surrounding farm houses Split into ‘working zone’ and ‘living zone’

GEOMETRY South wall predominately glazed for maximum sunlight Open plan living area and subtle design for better

ventilation purposes Generous room sizes Roof structure – mono-pitch? Other adaptations?

LIGHTING AND VENTILATION

Ventilation standards required for: Air quality (A,B,C) Ventilation rate for Comfort (l/s) Ventilation requirement for Health (l/s)

• Local Exhaust Ventilation (LEV) required for: Bathrooms Kitchen

LIGHTING AND VENTILATION

Artificial lighting should supplement natural lighting

Lighting Standards for Illumination requirement for each room

Possible lighting systems: LED’s Compact fluorescent lighting

MATERIALS

Consideration given to: Embodied Energy/ Carbon Thermal properties Conformity with building design Secondary consideration - cost.

Structural

Cladding

TIMBER SOURCING

Both Scots Pine and European Larch sourceable within Central Scotland

ROOFINGHTTP://WWW.GREENBUILDINGPRESS.CO.UK/ARCHIVE/SUSTAINABLE_ROOFING.PHP

STRAW-BALE INSULATION

Locally-sourced Readily available (rural) Negligible EE/EC U-value= 0.2 W/m2K

based on 350mm depth Relatively simple to

construct Lime plaster coating

TRIPLE GLAZING

Requirement to minimiseglazing heat-loss

0.8 W/m2K U-value iswithin PassivHaus maxstandards value

Approx 70% sunlighttransmission

Noise reduction notconsidered due to location

ENERGY SYSTEMS

Estimated annual electrical demand? 2700 kWh or 7-8 kWh per day. However if electricity is also used to

provide hot water, 11-12 kWh. Energy for space heating is by far the

biggest demand. For a desired reduction in CO2, reducing

the energy demand for space heating is necessary.

SOURCE (https://www.gov.uk/government/uploads/system/uploads/attachment_data/file/48195/3224-great-britains-housing-energy-fact-file-2011.pdf)

• Of the total energy used in a family home, appliances use up to 12%.

• The average annual growth in appliances energy use was nearly 3% a year, although the annual rise appears to be slowing.

RENEWABLE ENERGY SYSTEMS

Renewable Energy Systems can help supplement energy demand, reducing or eliminating draw from the grid.

Some systems researched: Wind Power Solar Power &

thermal collectors Ground Source

Heat Pumps Efficient water use

within the home

THANK YOU FOR LISTENING – ANY

QUESTIONS?