How to calculate EnergyPlus 'Time setpoint not met during occupied heating/cooling'?
Hi all,
I'm using EnergyPlus 23.1 and did a simulation for New York using the web-released Residential Prototype Model. I want to know the time setpoint unmet hour during occupied hours, so I looked into the 'Comfort and Setpoint not met summary.' Currently, I got the values below.
- Time setpoint not met during occupied heating: 130.83
- Time setpoint not met during occupied cooling: 112.83
- Time Not Comfortable Based on Simple ASHRAE 55-2004: 1153.00
However, I calculated this manually based on the definition from the InputOutput reference, the values are much higher than the EP calculated results.
- InputOutput reference definition: Time Setpoint is Not Met table shows how many hours the space is more than 0.2C from the setpoint during heating and during cooling.
calculated values are:
- Time setpoint not met during occupied heating: 518
- Time setpoint not met during occupied cooling: 652
I used the Zone people occupant count, the Zone thermostat heating setpoint temperature, the Zone thermostat cooling setpoint temperature, and the Zone mean air temperature for the calculation. For the occupancy status, the people count was divided by 3, which is the maximum number of occupants, and below 0.5 was considered as unoccupied status. The unoccupied periods were excluded from the unmet hour calculation.
I think the manually calculated unmet hour and EP calculated unmet hour should be the same or should have small differences. Could you let me know how EP calculates the time setpoint not met during occupied heating/cooling?
