Hilton Plaza

Integrating systems to save thousands in energy

Hilton Plaza is a small neighborhood shopping centre located in Cowandilla, South Australia. The centre operates 7 days a week and accommodates 1 major tenant, 10 minor retailers, a café and has 228 parking spaces available for shoppers.

The common mall area air conditioning is served by two roof mounted units and parking for the site is via an enclosed parking garage with exhaust and an external open-air carpark. All plant and lighting was previously operated by stand-alone timers, adjusted seasonally.

Remote connectivity, visibility and integration were all impossible with stand-alone timers and made it extremely hard for the facilities team to make site changes and measure the performance results in real time.

Increasing energy prices put pressure on the facilities team to investigate monitoring tools and energy saving opportunities. Subsequently building controls experts, Leading Edge Automation/Alerton Australia, was engaged to carry out a detailed site audit and provide recommendations.

During the detailed site audit, there were a number of Energy Conservation Measures (ECM’s) identified:

• The operation of the underground parking exhaust fans could be better managed by implementing fan control based on the number of cars entering and exiting the car park and Carbon Monoxide (CO) levels.
• The two roof-top mounted air conditioning units servicing the mall areas could be integrated and controlled by a centralized Building Management System (BMS).
• Carpark lighting could be better managed through ambient lighting condition-based control rather than simple time clock operation. This would allow the carpark lighting to module its hours of operation as the local conditions require.

• An Optergy BMS was installed to remove the stand-alone time clocks and provide Integration, remote connectivity and time scheduling control for mall air conditioning, lighting, and parking garage fans.
• Demand based lighting level (Lux) monitoring and control for external parking and security lighting.
• Push button switches were installed in the cleaner’s room which provided adjustable time period control for after-hours mall and parking area lighting.
• Installation and programming of variable speed drives (VSDs) for the enclosed parking garage exhaust fans coupled with Carbon Monoxide (CO) monitoring and fan operational control.
• An electrical meter that records total energy use, power quality characteristics for the incoming power supply, and “time of use” details of power consumption was installed. This data and reporting can be accessed via the local control panel.
• Site work was coordinated with Hilton Plaza’s maintenance electrician to ensure no inconvenience was caused to shoppers and tenants. Work in the parking garages and other miscellaneous work was completed outside of normal business hours to ensure the mall and parking garages remained completely accessible during operating hours.

• The parking garage fan operation and energy use were logged over a period of one month prior to commencing the upgrade for project benchmarking. In the first year the project achieved a $10,000 reduction in energy costs compared to the logged benchmark. The project has delivered energy savings greater than estimated.
• Remote access to the Optergy BMS allows site maintenance staff to remotely connect to monitor, report and make simple adjustments. A reduction of over $4,000 was achieved when comparing service callout costs to the previous year.