This online discussion is a follow-up from the October 5, 2017 subcommittee meeting. Please provide your feedback by Wednesday, October 12, 2017.
Should the ARC UES measure assume some percentage of RTU’s go from ventilation-only mode “off” (baseline) to ventilation-only mode “on” (efficient-case)? Please explain your reasoning.
- Outdoor Air CFM (when fan running at 100% with the baseline damper setting) = Outdoor Air CFM (when fan running at 40% with efficient-case damper setting, and for full-ARC, where DCV is calling for design outdoor airflow)
- This will be studied in the research strategy
- CAT recommends adding the following specification to the measure: “The building’s decision-maker shall understand the measure installation will cause a significant increase in energy consumption if they did not otherwise intend to ventilate the building using the RTU.”
- No, where the RTU is set to operate with the ventilation-only mode “on” in the efficient-case, we should assume 0% of the RTU’s would have operated with the ventilation-only mode “off” in the baseline.
- Pick one (or more):
- The building’s decision-maker is rational so the counterfactual really is a ventilated building
- I don’t care about the counterfactual because ventilation was needed anyway
- Other: _______
- Yes, where the RTU is set to operate with the ventilation-only mode “on” in the efficient-case, we should assume __% of the RTU’s would have operated with the ventilation-only mode “off” in the baseline.
- Pick one:
- Reasoning: Even with the “building’s decision-maker understanding” measure specification above, the counterfactual will include some unventilated cases, and we shouldn’t dictate our opinion on ventilation needs of the building
- Reasoning: Pre-conditions UES measures should use the observed energy consumption prior to measure installation
- Reasoning: _____