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Zone Equipment Sequence

asked 2017-04-04 08:21:20 -0500

BL's avatar

updated 2017-08-07 12:42:27 -0500

Does the sequence of zone equipment matter ? For example VAV RH box , Radiant Ceiling vs. Radiant Ceiling . VAV RH Box ?

Thank you

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answered 2017-04-04 08:32:18 -0500

Adam Hilton's avatar

updated 2017-04-04 08:36:02 -0500

ZoneHVAC:EquipmentList

Equipment is simulated in the order specified by Zone Equipment Cooling Sequence and Zone Equipment Heating or No-Load Sequence, depending on the current thermostat request. For equipment of similar type, assign sequence 1 to the first system intended to serve that type of load, assign sequence 2 to the next system, and so on. For situations where one or more equipment types has limited capacity or limited control capability, order the sequence so that the most controllable piece of equipment runs last. For example, with a dedicated outdoor air system (DOAS), the air terminal for the DOAS should be assigned Heating Sequence = 1 and Cooling Sequence = 1. Any other equipment should be assigned sequence 2 or higher so that it will see the net load after the DOAS air is added to the zone.

You generally want to put the equipment providing ventilation air first since most are neutral/cold supply when you have zone equipment that can also supply useful cooling/heating. I'm assuming the reheat coil in your vav terminal is to provide tempered air to the space, so that should go first since you want the radiant panel to see the load potentially introduced by it.

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really appreciate it, Adam !

BL's avatar BL  ( 2017-04-04 08:51:46 -0500 )edit

Here's the subjective part of choosing the order. I would have put the radiant system first so that is meets what portion of the load is expected. Then the VAV terminal would meet the remaining load and possibly at a lower air flow rate. So think through how your system should operate and then choose the order.

rraustad's avatar rraustad  ( 2017-04-04 09:25:14 -0500 )edit

I agree. Depends on the intended sequence of operations.

Adam Hilton's avatar Adam Hilton  ( 2017-04-04 09:52:13 -0500 )edit

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Asked: 2017-04-04 08:21:20 -0500

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Last updated: Apr 04 '17