Hill End Ecohouse: Solar power

Monday, May 10, 2010

Solar power

According to our solar power installer, Mark Wright of Stand Alone Power Supplies, the house has now been generating an average of 13.5kWh/day. September, October and November are the best months for the 20 degree roof pitch so the panels will generate more power and increase the daily average.

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About the Project

Welcome to the journey of sustainable construction. The Hill End Ecohouse will be a landmark sustainable home for inner Brisbane using design features, materials and products which have undergone rigorous assessment of their environmental, social and economic sustainability credentials.

The Site
The 10m wide site runs north south (not ideal for passive solar design) with a total area of 638sqm. 200 sqm of the site is riparian zone to protect the river's edge with no construction allowed in this zone.
Total floor areas are:
261 sqm - internal spaces
52 sqm - covered outdoor living
73 sqm - plant, storage and car/bike/kayak garage

Water
Appliances and tapware fittings minimise water waste. 71,000L of rainwater storage will supply parts of the house and garden. The main supply of water to the house is filtered rain water with mains water backup

Greywater will be treated and recirculated to toilets in the house (optional to washing machine) and to the front garden for irrigation and cleaning bicycles, gardening tools and if there must be one.. a car.

Energy
Natural daylight is maximised through building and window design to reduce need for artificial lighting. Light-coloured finishes will maximise reflection of daylight. External and internal lights use LED and compact fluorescent lamps for optimum efficiency. Appliances are selected for their energy efficiency.
Solar power will be captured to provide hot water and grid- connected electricity to supply the whole house's needs

Material selection
Criteria for material selection are a balance of:
- Recycled content
- Embodied energy
- Local supply
- Durability
- Low/no toxicity

Landscape
Lush plantings will provide shade, cooling of breezes, food and privacy, irrigated by treated greywater and rainwater.

Subtropical Design
Through the process of energy-efficient design which responds to the local climate and through selection of materials, infrastructure and garden plantings, the principles of subtropical design have been addressed.

Achieving 6 stars

In Queensland currently houses are only assessed on their energy-efficiency. In other states, the standard house ratings also takes into account energy use for the running of the building, water efficiency or waste. We may test the building against these systems along the way, despite them not being used in Queensland. Here is how the building achieves its energy rating:

ROOF INSULATION- R3.0 recycled polyester bulk insulation to roof cavities, and a sarking of sisalation bonded with closed cell foam. Ventilated roof cavity. Light-coloured roof finish

WALL INSULATION - R2.0 recycled polyester bulk insulation with sisalation of reflective "bubble-wrap and ventilated wall cavity

FLOOR INSULATION - R2.0 recycled polyester bulk insulation with mini orb below, beneath elevated timber floors.

GLAZING - Timber frames reduce heat transfer (compared to aluminium) and large expanses of glass to the Living, Dining and Best Bedroom use solar control, low-E glass. Where heat gain/loss is an issue to lower ventilation louvres, these were changed to insulating timber.

SUNSHADING - Eaves and awnings are generous to provide sun and rain protection. A drop down blind to the River Terrace provides shaded summer morning outdoor living and prevents indoor spaces from overheating. A trellis with deciduous creepers shades the north(street)-facing balcony.

NATURAL VENTILATION
Cross ventilation is provided wherever possible
- low-level louvres for cooling breezes over beds and sitting areas
- high level louvres to release hot air
- fanlights/louvres over doors for additional airflow
- battened vestibule to front door captures breezes securely
- floor vents under the fridge and to the main living level, draw cool air from below

MECHANICAL VENTILATION - ceiling fans to bedrooms and living areas

THERMAL MASS - concrete floor slabs and internal block walls to act as heat sinks

Publications about the Ecohouse

"Environmental Technologies and Services - Riddel Architecture" (A4 brochure), Queensland Government
Better Homes and Gardens magazine, August 2010, #186
Domus, China
Future Maison (France), June July 2010, # 24
Grand Designs magazine (UK)
Green Builder (USA), May 2010
Green magazine (Taiwan), June 2010 #05
Homes Magazine (UK), June 2010
Houses magazine (Australia), June 2010 #74
Metropolis Magazine (USA), July August
Metropolis Magazine (USA), July August
Monument magazine (Australia), June 2010
Plan magazine (Ireland) June 2010
Rum magazine (Sweden)
Sanctuary Magazine, Australia, May 2010
Style International magazine,

Hill End Ecohouse

Monday, May 10, 2010

Solar power

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