Twelve months of data from the metered categories is used to calibrate the computer simulation model. The M&V plan shall demonstrate the ability to identify specific problem areas if discrepancies exist between the modeled and metered data. When calibrating the as-built energy model, weather patterns must be reflected. You may be able to obtain this through the BMS. Calibration changes will also include occupancy and operational adjustments to reflect actual usage.
The calibrated energy simulation gives the owner and facility operator a true picture of savings from the ECMs instead of the predicted savings from the energy model developed during design. A simulation model developed during design makes a lot of assumptions on occupancy patterns, set points and weather. A calibrated energy model replaces those assumptions with real data while accommodating unforeseen program changes. If the actual results are greater than 10% from the predicted ones, compare the differences between the assumptions and the actual settings.
Installation of the M&V system should be fairly straightforward. Depending on the system and the experience of the subcontractors, however, specialized contractors may be needed.
The projected baseline energy use is calculated by an energy model during the design phase. All ECMs are removed from the model and this energy data becomes the baseline to determine energy savings when compared to the actual energy use. According to Option D of
Variable loads such as dimming controls can be profiled with short-term measurements that determine a load value pegged against another variable point that can be measured or accurately estimated over time. ECMs have to be metered to obtain actual savings. Variable loads like dimming controls can be measured only by metering them first at full power and then at low power. Measure and plot the power use at various dimming points at consistent time intervals.
The M&V plan should define the actions that will be taken by the facility manager to investigate the cause of any discrepancies found and correct any malfunctioning equipment. If goals are not met, or if unexpected performance occurs, the M&V systems will provide useful feedback in tracking the source of problems.
The M&V provider demonstrates through a narrative that the M&V plan will be able to verify actual energy use. For energy systems that are not addressed in the M&V plan you will need to provide a detailed reason for exclusion in the narrative.
The plan establishes who is responsible for managing the process during operations and for taking corrective action. The plan also establishes how long the monitoring will continue.
