There is a need to be able to track a building’s designed energy model against its actual performance. Building operators need three things to be able to achieve this.
- Designed energy model by load group
- The building’s sub-meters broken down by load group; and
- Ability to track each load group against the designed energy model
Using an energy monitoring system, it should be easy to sub-meter the various pieces of plant and then aggregate together to create load groups. Then the model for each load group can be entered and tracked against. Load group types include (not limited to):
- Chiller Plant
- Air Handling
- Car park Ventilation
- Toilet and General Ventilation
- General Power
With this approach operators can see at a glance which load groups are performing as expected and which are not. From here operators know where to concentrate their efforts and can drill down to the source of a problem quickly. This is a great way for existing buildings to gain visibility and then turn the ‘tap’ down to trickle to begin their journey towards high energy performance and lower overall costs.
For new buildings this method enables a source of truth and analytics on how systems perform all the way from the design phase, to delivery and day to day operation.
In both scenarios this saves hours of time on diagnosis and highlights load groups which are consuming energy excessively, causing higher than expected utility costs. It also removes blind guess work from building tuning and optimization giving the operator direct feedback of where to focus.
There are many metering systems on the market that can provide the visibility describe. However, Optergy is a software company that does things a little differently providing unique advantages. Optergy allows integration, monitoring and control of a buildings HVAC, hydraulic and lighting systems along with sub-metering systems all on the one platform.
Optergy includes a pre-built energy management application for automated reporting. One of the many reporting options is called Progress Against Budget Reporting. This allows operators to track a buildings design energy model against actual performance.
Using the Progress Against Budget reporting, operators can analyze performance by load group and then make changes to how a buildings HVAC, hydraulic and lighting systems operate all from the same software interface and platform. If issues are found or certain load profiles are not meeting expectations, then HVAC, hydraulic and lighting systems can then be monitored and tuned through one interface, putting the power back into the building operator’s hands.
Here’s an example provided by one of Optergy’s channel partners in Australia. This buildings energy model was based on a 5.5 NABERS energy star rating. The energy model was provided by the design consultant to the contractor. The contractor then implemented a sub-metering system which divided the building up by major load group and entered in the design model to track each load group against the design. The blue bars represent actual performance with the red representing the model.