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[EnergyPlus_Support] Zone Heating Design Supply Air Temperature Difference is not respected




Iâ??m modeling a baseline system according to Annex G of ASHRAE 90.1-2007. Paragraph G3.1.2.8 states that the â??system design supply airflow rates (..) shall be based on a supply-air-to-room-air temperature difference of 11°Câ??. In the case that Iâ??m modeling there is no outdoor air ventilation. I have imposed that statement through the fields â??Zone Cooling Design Supply Air Temperature Differenceâ?? and â??Zone Heating Design Supply Air Temperature Differenceâ?? of the object Sizing:Zone, as you can see in the following picture: <https://imageshack.com/i/nf55zcj>https://imageshack.com/i/nf55zcj

Iâ??m seeing the output graphs for the design day. Here the zone temperature for the winter design day (the setpoint temperature is equal to 20°C during the diurnal hours and itâ??s met): <https://imageshack.com/i/7gb2q5j>https://imageshack.com/i/7gb2q5j

That zone is conditioned by System 6 ? Packaged VAV with Parallel Fan Powered boxes.

The supply air temperature should be equal to 20°C + 11°C = 31 °C. In the following graph the temperature of the â??Outlet Node Nameâ?? of the object AirTerminal:SingleDuct:ParallelPIU:Reheat is plotted. You can see that that temperature is less than 31°C: <https://imageshack.com/i/0k4d2dj>https://imageshack.com/i/0k4d2dj

On the other hand, the supply air temperature is too high during the summer design day.

Can I consider the model autosized correctly according to Appendix G?



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