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energyplus heating and cooling load

asked 2019-03-15 04:30:09 -0500

xzb86 gravatar image

updated 2019-03-16 21:09:51 -0500

I'm working on FCU + DOAS system, I find that if I increase the outdoor air Volume., the load of FCU coil and DOAS coil will increase simultaneous (component sizing summary). the load has been doubled.

what shall I do if I want to use FCU deal with internal load, while use DOAS to deal with outdoor air load.

thank you

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Do you have an outdoor air flow rate set in your fan coil units?

mdahlhausen gravatar imagemdahlhausen ( 2019-03-15 10:41:02 -0500 )edit

yes, I add the OA flow rate in the HVACTemplate:Zone:FanCoil,, because I'm not sure how to add OA flow rate directly into the HVACTemplate:System:DedicatedOutdoorAir,.

xzb86 gravatar imagexzb86 ( 2019-03-16 10:14:09 -0500 )edit

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answered 2019-03-16 12:35:23 -0500

Set the outdoor air flow rate in your fan coil units to zero and then add a DOAS air loop with terminals serving each zone.

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ok, I have a DOAS terminal (AirTerminal:SingleDuct:VAV:NoReheat), but how can I set OA to this terminal? I find no OA setting in this air terminal.

xzb86 gravatar imagexzb86 ( 2019-03-16 18:04:09 -0500 )edit

Set the outdoor air requirement with the DesignSpecificationOutdoorAir object. Alternatively, you can use the AirTerminal:SingleDuct:Uncontrolled object and size the terminal for the outdoor air flow rate directly. Make sure the sizing criteria for the air flow is set to account for the DOAS and sized to air flow requirement.

mdahlhausen gravatar imagemdahlhausen ( 2019-03-18 10:23:57 -0500 )edit

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Asked: 2019-03-15 04:30:09 -0500

Seen: 143 times

Last updated: Mar 16