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[EnergyPlus_Support] odd autosizing results
I have some odd results using the HVAC autosizing feature for a furnace and central air conditioner system for my residence and am curious how Energy Plus is handling this situation. I am autosizing everything I can for both heating and cooling but specifying a flow/system of 700 cfm. The zone sizing output spreadsheet shows that I need 11,925 W heating and 4,049 W cooling. Yet the EIO file shows that I need 7,542 W heating with 1100 cfm and 4,802 W cooling with 590 cfm. First question is that my EIO file shows that I need lower heating (7,542 W < 11,925 W) since it calculated it with a higher flow rate (1100 cfm > 700 cfm) and similarly a higher cooling (4,802 W > 4,409 W) since it calculated it with a lower flow rate (590 cfm < 700 cfm. Is this correct.
My second question concerns how then Energy Plus sizes my equipment. The EIO file states that with a 700 cfm flow rate, I will have 9,629 W heating and 6,040 W cooling. This doesn't make sense. My heating capacity then does not meet my maximum zone load of 11,925 W and cooling capacity then is too big for my maximum zone load of 4,049 W. Where is Energy Plus calculating my equipment capacities from.
Mechanical Engineering Graduate Student
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