Netz Energy · Published
A building with efficient equipment can still consume more energy than expected if schedules, controls or operating assumptions no longer match its use. Start with evidence and a clearly defined performance problem. This guide helps UAE owners and FM teams choose between an audit, a controls investigation, recommissioning and a more detailed design study.
1. Describe the performance gap
List what has changed: consumption, operating hours, occupancy, comfort complaints or maintenance demand. Compare bills in energy units as well as cost, and confirm what the meter includes. Do not compare two buildings by area alone if their use, cooling supply or operating schedules differ.
Identify a baseline period and note exceptional conditions such as vacancies, fit-outs or plant outages. Keep raw data and the explanation of any adjustment so the comparison can be reviewed later.
2. Check how the building is actually controlled
Inspect time schedules, manual overrides, sensor readings and the sequence used to enable or stage equipment. Trends can help test whether the intended sequence occurs in practice. A controls audit is especially useful when functions exist in the BMS but their configuration or effectiveness is uncertain.
- Confirm occupancy schedules with the people using the building.
- Review persistent alarms and overrides with the operator.
- Check sensor plausibility before acting on a trend or calculated indicator.
- Record comfort, ventilation and humidity requirements alongside energy objectives.
3. Choose the investigation that fits the issue
An energy audit identifies and prioritises opportunities across the agreed scope. A BACS review focuses on automation and control functions. Commissioning tests whether systems work together against agreed requirements; for an existing building, the investigation should reflect its commissioning history and current needs. The US Department of Energy’s commissioning guidance is a useful technical reference, not a statement of UAE legal requirements.
For a proposed envelope, system or design change, simulation can compare scenarios before committing capital. Record model inputs and uncertainty. Predicted performance should not be presented as an observed result.
4. Implement changes under controlled conditions
Agree permissions, test windows, acceptance criteria and a rollback plan. Change a manageable set of variables and check the response. Do not reduce ventilation, disable safety functions or change process conditions simply to achieve an energy target. A qualified operating team must approve and supervise the work.
Document the final settings, unresolved defects and operator instructions. If a test depends on a particular season or load, assign a follow-up date and responsible person rather than marking it complete without evidence.
5. Verify and keep reviewing
Compare the result with a baseline that accounts for relevant changes in use and weather. Separate the effects of multiple measures and explain uncertainty where data is limited. A lower bill by itself does not establish the contribution of a particular project.
Give the FM team a small set of useful indicators, an exception-review routine and training on the implemented changes. The final deliverable should be a working operating practice, supported by records that survive changes of contractor or staff.