Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Some unmet hours is to be expected. BEopt autosizes HVAC systems based on ACCA Manual J, which uses 1%/99% design temperatures. In other words, the HVAC is intentionally sized not to meet 1% of all hours of the year, or 87.6 hours. Since the Manual J calculation is a simplification relative to an hourly energy simulation, the actual hours not met will vary somewhat from that. If you look at the hourly output for temperatures in the living space, you'll probably find that the temperature deviates very little from the setpoint during these 50-100 hours.
