Bayswater Station – Concept Design
- Client: The Public Transport Authority of Western Australia (PTA WA)
- Project Location: North-East Perth, Western Australia
- Date: October 2019
The new Bayswater Station project will become a key METRONET precinct with the Midland Line, Forrestfield-Airport Link and Morley-Ellenbrook Line connections, giving people the option to travel to the Airport, Swan Valley tourist region, the CBD and beyond.
The key features of the project include:
- constructing a new four-platform station long enough to accommodate six-car trains on a higher rail bridge over King William-Coode streets
- Additional rail infrastructure between Bayswater and Meltham stations
- Whatley Crescent-Beechboro Road South connection under the railway
- Integrating bus services with the local road network
- Building an elevated Principal Shared Path along the Whatley Crescent side of the rail bridge
- Upgrading the pedestrian underpass at Leake Street
eTool were engaged by the PTA WA to perform a Life Cycle Assessment (LCA) at the Concept Design stage of the new Bayswater Station and surrounding railway infrastructure. The modelling helped identify key environmental impact areas for the project over its estimated 120 years lifespan.
eTool was tasked to provide LCA of the station Concept Design as part of the METRONET Sustainability Strategy 2019-2022, which requires the integration of life cycle design into the planning process of METRONET projects.
The Scope of the LCA included all works associated with:
- Entry buildings for the station, including retail tenancies and plant room
- The station platform
- Bridge works
- Rerouting of the Principal Shared Path (PSP)
- New railway infrastructure (including track, sleepers, ballast, signalling, etc.) for the station as well as a turnback facility
- Other operational energy and water
- Additional civil works including bulk earthworks, modifications to the surrounding road network and a new bus laydown area.
Low Impact Strategies in Detail
eTool Engineers suggested the following Low Impact strategies for the Bayswater station:
30% Blast furnace slag cement replacement in all major concrete elements in the superstructure
Ground Granulated Blast Furnace Slag (GGBS) is a by-product of the iron making process and is considered a greener construction method because the GGBS requires less than a fifth of the typical energy for conventional cement production, and less than a fifteenth of the carbon emissions. It also offers benefits for workability and in reduced chemical attack/degradation.
Utilising high efficiency LED lighting for all internal areas
As LED lights continue to develop they are surpassing fluorescent lighting in efficiency and provide designers with a greater array of colour and configurations. The efficiency of LED lights now allows significant savings in electricity providing they are specified appropriately.
Specifying high efficiency HVAC systems for all air-conditioned areas
By increasing the efficiency of the air-conditioners, gains in environmental performance can be made. Upgrading to high efficiency systems from an EER of 3.0 to 4.4 will have about a 20% saving in cooling energy.
Utilising LUX sensors to control lighting for all internal areas
Lighting systems that have LUX sensors are more energy efficient automatically providing a suitable amount of lighting in changing conditions. For this recommendation, eTool assumed a 10% reduction in lighting demand for internal areas with a high level of natural light access provided by glazed entry doors, curtain walling and windows.
Sourcing locally produced rail ballast
The sheer quantity and weight of ballast required for the project means that its transport to and from the site has a significant environmental impact. Sourcing ballast locally has the ability to reduce the transport distance and the overall environmental impact significantly.
Utilising high efficiency lighting for the station platform, the PSP and street lighting
As with the internal areas, utilising high efficiency LED lighting for the external lit areas in place of fluorescent lighting has the potential to offer significant savings in electricity.
The use of renewable energy generated onsite from solar PV panels
With the rising price of electricity, the economics of solar are very favourable. Using solar generated power on site results in much lower emissions associated with the building compared to using the fossil fuel powered grid. Feeding out to the grid assumes a net environmental credit as the electricity will be consumed by a neighbouring consumer therefore reducing the demand on the grid. Surplus exported energy can be thought of as an offset for the carbon associated with the materials used in constructing and maintaining the asset.
This assessment was conducted by Rob Campbell from eTool.