Re: [EnergyPlus_Support] Supply and Return Plenums, Splitters and Mixers

["jeannieboef@xxxxxxxxx" <jeannieboef@xxxxxxxxx>]

Fred is right. On the supply side, think of tree branching...as soon as two branches come together again, that is not allowed. So multiple outlets from a zonesplitter (badly named supply duct splitter) can't thereafter feed into a common plenumn. A plenumn is also a splitter and can feed multiple zones. Two plenums can't feed the same zone.

On the return side, it's the same but backwards like stream tributeries feeding into a river.

Mit freundlichen GrüÃ?en- Sent from my iPhone (excuse the brevity)

i. A.

Jean Marais

b.i.g. bechtold

Tel.   +49 30 6706662-23

On 15.01.2014, at 22:06, Walter Buhl <wfbuhl@xxxxxxxxx> wrote:

 

Karen,

You need an initial zone splitter (Zone Splitter 0?) to split the air between Zone Splitter 1, Supply Plenum 1, and Supply Plenum 2. Supply Plenum 2 Zone Splitter isn't needed; Supply Plenum 2 can do the "splitting". Try to keep the levels of spitting (by plenums or splitters) to a minimum since the updating is lagged 1 HVAC time step per level. There are no rules on the supply side other than the topology must look like a tree: once split, it can't be recombined.

The return side has more stringent rules, but I can't remember what they are. Something like one level of mixers and plenums followed by a final mixer.

Fred

On Wed, Jan 15, 2014 at 12:34 PM, Karen Walkerman <kwalkerman@xxxxxxxxx> wrote:

 

I am trying to figure out how supply and return plenums can be used in EnergyPlus, especially in conjunction with ZoneSplitters and ZoneMixers.

The example file "5ZoneSupRetPlenRAB.idf" uses a supply plenum.  There is only one plenum outlet node, and the plenum outlet node is the inlet node for a ZoneSplitter.  The example file "5ZoneSupRetPlenVSATU.idf" is a similar file, but there is no ZoneSplitter.  The SupplyPlenum is the only object appearing on the AirLoopHVAC:SupplyPath list.

What combinations of plenums and zone splitters/mixers are allowed?  I'm not trying to simulate anything specific at the moment, just trying to establish some general rules.

I'm attaching an image that shows an airloop with three different distribution types:

1.  Zone Splitter and Zone Mixer

2.  Supply and Return Plenums

3.  Supply Plenum serving ZoneSplitter, return through a Zone Mixer and Return Plenum.

For this image, the AirLoopHVAC:SupplyPath object would look something like this:

AirLoopHVAC:SupplyPath,

AirLoop 1 Supply Path,

AirLoop 1 Supply Path Inlet Node,

AirLoopHVAC:ZoneSplitter,

Zone Splitter 1,

AirLoopHVAC:SupplyPlenum,

Supply Plenum 1,

AirLoopHVAC:SupplyPlenum,

Supply Plenum 2,

AirLoopHVAC:ZoneSplitter,

Supply Plenum 2 Zone Splitter;

Is this allowed?

Thanks,

--

Karen

<image.png>

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