Hi,
I was wondering if any can help me with an issue I am
experiencing in EnergyPlus.
Initially when we looked at the User Design Airflow column
under Zone Cooling Loads in the output I saw that the supply air-to-room air
temperature was much less than 20F even though the room setpoint was at 75 and
supply temperature was 55F. (Following ASHRAE 90.1 2007 Appendix G requirements
for Baseline model). We corrected this by adjusting the design outside air at
the zone level sizing parameter however now the undercooled hours are about
1000 (much more than allowed). This tells that without taking the outside air
into account for zone sizing, there isnâ??t enough airflow to cool the space
during the year. The outside air zone sizing parameter isnâ??t used for
calculating the cooling capacity, only the airflow, which is what I think is
causing difference in temperature differences in the zone. However how do we
meet the supply air-to-room air temperature delta T requirement and have less
than 300 unmet load hours as also required?
I have attached the Baseline idf and output for your review.
Thank you for your time on this. Any help is greatly
appreciated.
Celia