AI-driven chiller sequencing and condenser water optimization delivered verified energy savings across a 51,034 m² premium-grade commercial tower in Sydney's CBD.
The Challenge
400 George Street is a 51,034 m² premium-grade office tower in Sydney's CBD operating a 7,480 kWr central chiller plant. The facility's existing building management system (BMS) relied on fixed set-point controls that could not adapt to dynamic load conditions, weather variations, or partial-load operation.
The result was systematic over-cooling, sub-optimal chiller staging, and condenser water temperatures that did not track ambient conditions — all driving avoidable energy spend and unnecessary carbon emissions across the portfolio.
The plant was consuming significantly more energy than required to meet the same cooling demand — a common outcome of static set-point controls in large commercial HVAC systems.
Building Profile
| Building Type | Premium-grade commercial office tower |
| Total Area | 51,034 m² |
| Location | Sydney CBD, New South Wales |
| Chiller Plant Capacity | 7,480 kWr |
| BMS Integration | March 2023 |
| M&V Period | April 2023 – March 2024 |
| Data Source | Building Data Warehouse + FM Team |
The Exergenics Approach
Exergenics deployed its AI Digital Twin platform to model the full chiller plant, identify the optimal operating envelope, and push real-time control signals directly into the existing BMS — with no hardware changes and zero operational disruption.
Exergenics built a high-fidelity AI model of the chiller plant using 12+ months of historical BMS and energy data. The model captures load profiles, ambient conditions, and equipment performance curves to establish a precise energy baseline.
Machine learning algorithms continuously compute optimal chiller staging sequences, condenser water temperature set-points, and chilled water differential pressure targets — adapting in real time to occupancy, weather, and load demand.
Control signals were written directly into the existing BMS in March 2023, enabling autonomous operation. A full 12-month IPMVP-aligned M&V period confirmed savings against the independently verified baseline, with a final report issued March 2024.
Verified Results
Following a full 12-month measurement and verification period conducted in accordance with IPMVP principles, the following savings were independently confirmed.
| Outcome | Verified Result |
|---|---|
| Annual Energy Savings | 10.4% reduction in chiller plant energy consumption |
| Carbon Reduction | 118.4 tCO₂ per annum |
| OPEX Reduction | $23,680 per annum |
| Plant Capacity | 7,480 kWr |
| M&V Baseline | April 2023 (Preliminary) — March 2024 (Final) |
| Data Sources | Building Data Warehouse, FM Team records |
| Implementation Date | March 2023 |
| Capital Expenditure | $0 — software-only deployment |
Exergenics delivers verified energy savings for commercial buildings, hospitals, airports, and industrial facilities — with no capital expenditure required.