The Sociable Weaver Display Off-grid Home, proposed for Dollar, VIC has undergone a life cycle design process. The Sociable Weaver is a design and building company committed to reinventing our built environment in a way that enhances individual well-being, strengthens communities and promotes environmental sustainability.
The results of the Life Cycle Assessment demonstrated a 69% savings when compared to business as usual, code compliant practices. Environmental design initiatives in the project are summarised in the table below.
- Client: Sociable Weaver
- Location: Dollar, Victoria
- Date: January 2020
The key result of the whole of building Life Cycle Assessment is a figure of -2869 kg CO2-e per year per occupant. Please note LCA measures impact so a negative number is the ‘beneficial’ side of carbon performance, meaning the design will provide a carbon improvement over its life – Carbon Positive.
It is observed through the LCA modelling that the following areas have the greatest impact to the overall environmental footprint of the building:
This assessment is based on an estimated building life of 100 years of which an estimated 70 years will be completely off-grid. Off-grid was achieved by a combination of energy generation system water and energy storage system in combination with behavioural changes that will ensure off-grid systems will satisfy occupants energy and water demand over the period of time assessed in this LCA.
The current occupants do not intend to be using a generator but will instead further reduce consumption by closely monitoring energy use and by embracing behavioural change. Furthermore, monitoring technologies, energy and water consumption reduction recommendations have also been adopted to incentivise reduction of consumptions and track energy and water used. Additionally, the current occupants are planning on installing a wind turbine to subside the absence of a diesel generator.
On site renewable electricity generation and storage
For electricity generation, a 5kW Solar PV is employed. It is estimated the rooftop 5kW Solar PV system will get replaced three times over the period of assessment and a total of 4 times over the life of the building. For electricity storage, a 21kWh lithium battery bank is employed to store electricity produced by PV system when in excess, and to provide energy during hours of lover energy generation, the battery pack will also provide 3 days of electricity should the PV system fail. Solar PV size, battery pack size and energy utilisation have all been carefully assessed to provide enough electricity all year round. Additionally, heat pump was set up to act as an additional energy storage unit for excess PV electricity, heat pump will utilise timbers or relay switches to only activate when the PV is generating power, and ideally have higher thermostat set points to store more heat.
This assessment was conducted by Leonardo Poli and certified by Fei Ngeow from eTool.