Since return plenums like a mixer (multiple inlets, 1 outlet) and you aren't allowed to
use splitters, the configuration you describe can't be modeled. You can do something
like 4 zones => 2 return plenums => 1 return plenum, but there is no way to "split"
the flow in the return air path.
Fred Buhl
nina.defreyne wrote:
__._,_.___Is it really possible for return plenums to be in parallel? I'm modelling a system where the last two return plenums must be in parallel, but it gives an error: The air first goes to a splitter to 4 different zones, then the air of the 4 zones goes to a return plenum. After that the air of this return plenum has to go to 2 other return plenums (in parallel). I have done that by placing a splitter after the first return plenum and a mixer after te last two return plenums, but this doesn't seems the right way because it gives an error about the splitter and mixer inlet and outlet nodes. (I think it isn't possible to connect a return plenum with a slitter or mixer in energy plus) How is it possible to let the air split up to 2 return plenums? (and to let it come together again)? thanks, Nina. --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" <mjwitte@...> wrote:Return plenums are much more flexible and may be in parallel or in series. A return plenum can have multiple inlets and a single outlet. The temperature impacts on the plenum zones are lagged by one zone timestep for each level of plenum. The return air flow must originate in a zone which has an air loop supply inlet. This supply flow, less any exhaust from that zone, establishes the return air flow rate. A return plenum can receive one or more return flows (either directly from zones or from other return plenums) and pass the total flow through it's outlet to another plenum or to a zone mixer or to the air loop return inlet. Mike On 7 Aug 2003, at 23:57, kirbyschapman wrote:Can one zone feed to other zones? In other words, can i force theairto flow through successive zones, as in from one end of abuilding tothe other? Thanks for the help. Kirby --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" <mjwitte@g...> wrote:Only one supply plenum is allowed per air loop. Mike On 7 Aug 2003, at 20:09, kirbyschapman wrote:Hello, Folks. I'm attempting to use four separate supply plenums. Thecaveatis thatthe first plenum serves a couple of zones, plus the secondplenum. Thesecond plenum serves one zone and the third plenum. Finally,thethirdplenum serves a final zone. In doing so, I used a splitter from Plenum 1 to feed the twozones andPlenum 2. Then another splitter from Plenum 2 to a zone andplenum 3.This didn't work, and in fact the program crashed (I only ranitwiththe first two zones). Is this the correct way to tackle a situation like this? Thanks much Kirby ------------------------ Yahoo! Groups Sponsor ---------------------~--> Buy Ink Cartridges or Refill KitsforYourHP, Epson, Canon or Lexmark Printer at Myinks.com. 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