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ZoneHVAC:FourPipeFanCoil serving 2 different Zones!!

asked 2017-07-17 05:26:41 -0500

Ali Raad's avatar

updated 2017-07-17 07:30:13 -0500

Hello everyone,

Is there anyway to model a ZoneHVAC:FourPipeFanCoil serving 2 different Zones in the same time. In my model I have 2 zones that are served by the same Fan Coil unit but I can not make them as one zone since one has a floor radiant while the other one does not. I would appreciate any ideas regarding this matter.

Thank you,

Yours Sincerely,


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answered 2017-07-17 08:28:38 -0500

Hi @Ali Raad

You can simply model two separate identical autosized fan coil units serving each of the two zones. Make sure that the heating/cooling sequence of the radiant floor and the FCU is correctly modelled for the zone with both these components in "ZoneHVAC:EquipmentList".

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Hello @rsunnam

Thank you for your reply, I can not use auto-sizing in my model I need to use the exact manufacture spec. Do you think there is another way to do it apart of the auto-sizing. Also may I know what is your idea about heating/cooling sequence for a Zone that is served by VAV, Fan Coil and Radiant. What is the best heating/cooling sequence in you opinion?

Thank you,

Yours Sincerely, Ali

Ali Raad's avatar Ali Raad  ( 2017-07-18 05:26:51 -0500 )edit

Hi @Ali Raad , There are two ways you can solve this: 1. If radiant floor is the only reason you zoned them separately, you can probably zone them together and draw a sub-surface for the radiant floor (instead of the whole floor) and then you can model one FCU with manufacturer specs 2. If you want to model two FCUs as I had mentioned, you can model both the FCU components according to manufacturer specs. If you know the max air flowrates to each zone, you can hardsize them and use zero pressure drop for one of the fans to avoid double counting fan energy

rsunnam's avatar rsunnam  ( 2017-07-18 08:36:14 -0500 )edit

Regarding your question about the heating/cooling sequence - it would totally depend on the system sequence of operations developed by the mechanical designer. It is usually included in the controls submittal.

rsunnam's avatar rsunnam  ( 2017-07-18 08:38:02 -0500 )edit

@rsunnam Thank you very much for your help, and have a great day.

Ali Raad's avatar Ali Raad  ( 2017-07-18 08:45:36 -0500 )edit

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Asked: 2017-07-17 05:26:41 -0500

Seen: 2,104 times

Last updated: Jul 17 '17