[16469] Low Energy Building Design

critique 1

Adam Boney, Fraser Cassels, Marc Breslin and Nick Burns

Location

Case studiesConsidered a number of similar projectsFocused on layout, technologies and locationsFound there is no set, prescribed approach

Case studiesKingspan Lighthouse, Watford

• Zero carbon house – ‘Light on the world’s resources’• 40° mono-pitch roof accommodating solar PV panels• Passive ventilation and cooling with wind catcher•Grey water recycling•Low energy LED lighting

Case studiesPassivhaus project, Galway • Timber frame construction, 235m2

• Balanced ventilation system with heat recovery• Large amounts of rock wool insulation• Water-saving WCs

Case studiesBatavia, Unst

• Zero carbon, detached house• Timber frame construction• 2 micro wind turbines• Air-to-water heat pump• Strong links with local, national and international organisations

ClimateConsistent levels of strong wind all year

roundVariable sunshine levels – low amount in

winter, higher in the summer

Source: http://www.shetland.gov.uk/documents/SinStatsBinder1.pdf

Energy usageAverage four bedroom house consumes approx.29,000kWh of gas and 6,000kWh of

electricity

Energy use:Heating: 61%Hot water: 23%Lighting/electrical: 13%Cooking: 3%

TechnologyWind technologies:

Small micro wind turbine

• Cost: £ 500-£1,200

• Size: Range from a few watts to

a few hundred watts.

• Output: 700kWh-2,500kWh

depending upon wind speed.

• Payback period: 4-5years.

Technology

• Cost: £4,000 -£10,000

• Size: Few hundred watts to

a few hundred kilowatts.

• Output: 50,000kWh-

800,000kWh depending on

wind speed.

• Payback period: 5-6years.

Stand-alone wind turbine

Technology

4 5 6 7 8 600W 794 1354 1948 2504 29692.5kW 2473 4282 6333 8404 102516kW 6765 11622 16900 21944 2621615kW 16912 29045 42250 54860 6554180kW 51980 122560 175200 210240 245280250kW 141229 383000 547500 657000 766500

Average site wind speed in m/s

Yearly output in kWh for turbines rated at:

From our climate investigation it is apparent that the average wind speed for the location is in the region of 7 m/s.

Our site will install a 2.5kW wind turbine to satisfy the electrical needs of the building

TechnologyFrom electricity generated via wind power:

Ground-source heat pump

HVAC

• Direct heating system

Additional Technology PV cells

Rainwater harvesting

• Clean source• Effective in summer•Low maintenance• Generation 180KWh per square metre

Collected water can be used for:• Drainage• Washing (post antibacterial treatment)• Drinking (post mineralization)

Possible TechnologiesSprung floor

Possible layoutsBased on initial thoughts and findings…

• Materials• Orientation• Size

Possible layouts