I have several questions relative to this credit as it relates to new building construction. Question #1: Does the requirement to install continuous metering equipment for the 10 end-uses also necessitate that the 10 end-uses be continuously metered/monitored at the BMS? Question #2: To what level of rigor and/or accuracy must end-uses be metered or be capable of being metered? For example, the project employs the following energy conservation measures relative to lighting and lighting controls: high efficiency lights, dimming controls, occupancy sensors and daylighting controls. If Option B were to be pursued, would individual lighting circuits and dimming panels be required to be metered in order to determine lighting usage patterns and power consumption relative to each lighting ECM since no stipulations are allowed? Is this level of sub-metering also required for Baseline calibration if Option D were to be pursued? Question #3: Under Option B, must all strategies that have the potential to conserve energy relative to a Code-developed Baseline be analyzed in order to comply with this credit, or can the client chose to focus only on specific ECMs of their choosing? Question #4: Since Option B does not permit any stipulations, does a building that uses operable windows and a range of control interfaces with HVAC equipment ranging from none to end-switches preclude Option B and necessitate Option D whereby some level of stipulation relative to window opening and its affect on terminal unit conditioning can be applied?
1. The intent of the M&V effort is for the project to actually undertake the monitoring described in the M&V Plan. As stated in the Reference Guide, this should include identification of those parties who will provide the monitoring, the tools in place to allow it and the analytical methods that will be used to perform the work. Review previous ruling (6/2/2002). 2. Per Table 1 (section 3.4 page 22) Volume 1 March 2002 revision of the 2001 IPMVP temporary metering is consistent with the Option B approach. In the case of constant loads (such as high efficiency lights), typical load values (kW, BTUH, etc) and operating schedules (hrs / wk, etc) should be established to confirm that the design intent is being achieved. 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. These can then be used for input to either methodology. For Option D, review previous (9/20/02) Ruling 3. It is assumed that all strategies to save energy would be analyzed as part of the design development process and thus an M&V methodology for each could be described. For Option B, the strategies to be focused on should be those that involve the 10 required loads. We would therefore expect to see the M&V Plan focus on the "intersection" between project-specific ECM\'s and LEED required loads. As noted in 2 above, Option D would require that end use elements affecting whole building usage would be monitored and used to calibrate the model. 4. One of the largest challenges in new construction evaluation is to have an adequately described expected energy usage for the given measure. This can be achieved by subtracting energy savings from an expected baseline, but those values must be ECM and, often, system specific. This challenge applies to all methodologies, as even with Option D the intent is to be as load specific as possible with measurement. Applicable internationally.