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One FCU serving multiply zones, and with an outdoor air MAU

asked 2018-09-07 09:53:23 -0600

Westely gravatar image

updated 2018-09-08 08:22:02 -0600

Hello all: I am trying to model an FCU serving three small offices in a whole building using OpenStudio. My aim is to simulate the room temperature for every office and check if it matched the actual temperature, so I define every office as a single zone. Furthermore, there is an AHU serving the whole building, so it serves outdoor air for the three offices ( every office has one diffuser). The FCU and AHU both use heating/cooling coil.

Because the zone equipment "Four pipe fan coil" only serves a single zone, so I use AirLoopHVAC Unitary System and a fan to simulate the FCU, connect it into the three thermal zones with diffusers. but I've no idea how to add outdoor air in this case.

Another way is that I model an AHU with outdoor air serving the three thermal zone, then add zone equipment "Four pipe fan coil" for all zones. This method means I have three FCUs for every office, not one FCU serving three offices, which is different from the actual situation.

I was wondering if you have any comment in this case, and any answer is welcome! Thanks.

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EnergyPlus? Another tool? Add a tag for the software you are using.

__AmirRoth__ gravatar image __AmirRoth__  ( 2018-09-07 11:17:10 -0600 )edit

I use openstudio~sorry I tried to add the tag but failed.

Westely gravatar image Westely  ( 2018-09-07 14:21:53 -0600 )edit

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answered 2018-09-10 13:16:42 -0600

As of v8.8 (Sep 2017) EnergyPlus supports more than one airloop serving the same zone. So you can have one AirloopHVAC for the outdoor air, and another for the fan coil unit.

I don't know if OpenStudio supports this yet. If not, I would keep the AirLoopHVAC that you have for the FCU and then use one ZoneHVAC:OutdoorAirUnit per zone to supply the outdoor air to each zone.

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Asked: 2018-09-07 09:53:23 -0600

Seen: 741 times

Last updated: Sep 10 '18