[EnergyPlus_Support] Re: EvapCooler in exhaust stream

["Jean marais" <jeannieboef@xxxxxxxxx>]

Thanks Richard, then my first connection (as intended in the return airstream) was successful. But you showed me how to move it about in the ODA system if the equipment possition were somewhere else. Since I have a DOAS, return and exhaust airstreams are sort of the same and I connected it as simply as possible to avoid my then confusion of the ODA System. Thanks again.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, RRaustad@... wrote:
>
> 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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