RE: [EnergyPlus_Support] Re: EvapCooler in exhaust stream

[RRaustad@xxxxxxxxxxxx]

If you listed the evap cooler in the AirloopHVAC branch (follow Branch
List Name input in the AirloopHVAC object to the associated objects
I've shown)

  AirLoopHVAC,
    Typical Terminal Reheat 1,  !- Name
    ,                        !- Controller List Name
    Furnace 1 Avail List,    !- Availability Manager List Name
    1.6,                     !- Design Supply Air Flow Rate {m3/s}
    Air Loop Branches,       !- Branch List Name
    ,                        !- Connector List Name
    Outdoor Air Mixer Inlet Node,  !- Supply Side Inlet Node Name
    Return Air Mixer Outlet, !- Demand Side Outlet Node Name
    Zone Equipment Inlet Node,  !- Demand Side Inlet Node Names
    Air Loop Outlet Node;    !- Supply Side Outlet Node Names

  BranchList,
    Air Loop Branches,       !- Name
    Air Loop Main Branch;    !- Branch 1 Name

  Branch,
    Air Loop Main Branch,    !- Name
    1.6,                     !- Maximum Flow Rate {m3/s}
    ,                        !- Pressure Drop Curve Name
    AirLoopHVAC:OutdoorAirSystem,  !- Component 1 Object Type
    OA Sys 1,                !- Component 1 Name
    Outdoor Air Mixer Inlet Node,  !- Component 1 Inlet Node Name
    Mixed Air Node,          !- Component 1 Outlet Node Name
    PASSIVE,                 !- Component 1 Branch Control Type
    AirLoopHVAC:Unitary:Furnace:HeatCool,  !- Component 2 Object Type
    GasHeat DXAC Furnace 1,  !- Component 2 Name
    Mixed Air Node,          !- Component 2 Inlet Node Name
    Air Loop Outlet Node,    !- Component 2 Outlet Node Name
    ACTIVE;                  !- Component 2 Branch Control Type

then yes, it did get simulated. But if you notice in this example, the
first inlet node name in this branch is "Outdoor Air Mixer Inlet Node",
which is also the Supply Side Inlet Node Name in the AirloopHVAC
object. Then, in the AirloopHVAC object, each equipments outlet node
connects to the next equipments inlet node and on until the last outlet
node is the same as the Supply Side Outlet Node Name in the AirloopHVAC
object. This syntax forms the complete supply air loop. The OA system
is formed in a similar way as I showed in the previous email (it's just
referenced here because of the 2 nodes [return and mixed] I mentioned
in my previous email, the ones that are not part of the OA system).

Now, if you correctly connected the evap cooler in the AirloopHVAC
object, it would not have been in the outdoor air system, it would have
been the first equipment in the main supply air loop. Since the OA
system connects here using the return air node, what you actually did
was connect the evap cooler to the return air node of the OA mixer. The
inlet of the evap cooler connected to the zone return nodes after the
mixer, and the outlet of the evap cooler connected to the return node
of the OA mixer.

So when you looked at the outlet air temperature of the evap cooler,
yes is was at the set point and operating "as you connected it", it was
just that you didn't connect it as you intended. You can tell if it's
operating by looking at the flow rate at the inlet/outlet node, and the
T/W at the inlet/outlet node. The evap cooler probably has dedicated
report variables you can look at also, check the rdd file.

I have now showed you how to connect a piece of equipment in both the
air loop, and the outside air system. Try drawing out your equipment
schematic as they connect to the air loop and/or outdoor air system and
try again. If you do this in word (or scan your sketch) and have
troubles, you can email the word doc so I know what your trying to do.

Good luck.




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