[EnergyPlus_Support] Energy consumptions of fixed sizing and autosizing with heating setpoints change

["hkllzhang@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Hi, all!

Now Iâ??m doing simulations about heating setpoints changing in DOE Post-1980 Medium Office model. VAV system is used in the model, DX two-speed electric cooling coil and gas cooling coils are installed in the central plant, and electric reheat coils are equipped at the outlet of VAV box. I tried to consider the influence of system autosizing on the energy performance. So for one set of simulations, I just change the heating setpoints, and leave system and component sizing (nominal capacity, maximum flowrate, etc.) as â??autosizeâ??in the idf file. For the other set of simulations, I fixed the sizing values as they were in the file with original setpoint, then changed the setpoints.

I thought the set with autosizing could consume less energy, but the results of these two sets are the same. At same heating setpoint, energy consumption for fixed sizing and autosizing are the same. Could anyone help me to explain it?

Best,

Kelly

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Posted by: hkllzhang@xxxxxxxxx

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