[EnergyPlus_Support] EvapCooler in exhaust stream

["Jean marais" <jeannieboef@xxxxxxxxx>]

Hi Group,
The current example files show these coolers working in the supply stream with ODA equipment objects and ODA controllers.

I'm trying to get this to work in the exhaust air stream and propose the following (do I need a controller object? Which would be best?)

AirLoopHVAC:ReturnPath,
  AHU Return Path,                                         !- Name
  AHU Return Air Outlet,                                   !- Return Air Path Outlet Node Name
  AirLoopHVAC:ZoneMixer,                                   !- Component Object Type
  AHUAirLoopHVAC:ZoneMixer,                                !- Controlled Component Name
  EvaporativeCooler:Direct:ResearchSpecial,                !- Component Object Type
  Direct Evap Cooler;                                      !- Controlled Component Name

AirLoopHVAC:ZoneMixer,
  AHUAirLoopHVAC:ZoneMixer,                                !- Name
  ZoneMixer Outlet Node,                                   !- Outlet Node Name  AHU Return Air Outlet
  Underground:Basement Return Outlet,                      !- Inlet Node Name
  PierW%N%E00:PierW%N%E00 Return Outlet,                   !- Inlet Node Name
  PierW%S%E00:PierW%S%E00 Return Outlet,                   !- Inlet Node Name
  PierW%W%E00:PierW%W%E00 Return Outlet,                   !- Inlet Node Name
  PierW%E0Z%E01%E02:PierW%E0Z%E01%E02 Return Outlet,       !- Inlet Node Name
  PierW%E03:PierW%E03 Return Outlet,                       !- Inlet Node Name
  Hall%E00:Hall%E00 Return Outlet,                         !- Inlet Node Name
  Hll%E0Z%E01%E02%E03%:Hll%E0Z%E01%E02%E03% Return Outlet,  !- Inlet Node Name
  PavilionN:PavilionN Return Outlet,                       !- Inlet Node Name
  PavilionS:PavilionS Return Outlet;                       !- Inlet Node Name
  
EvaporativeCooler:Direct:ResearchSpecial,
  Direct Evap Cooler,                                       !- Name
  On,                                                       !- Availability Schedule Name
  0.7,                                                      !- Cooler Effectiveness
  30.0,                                                     !- Recirculating Water Pump Power Consumption
  ZoneMixer Outlet Node,                                    !- Air Inlet Node Name
  AHU Return Air Outlet,                                    !- Air Outlet Node Name
  AHU Return Air Outlet,                                    !- Sensor Node Name
  ,                                                         !- Water Supply Storage Tank Name
  0.0,                                                      !- Drift Loss Fraction
  3;                                                        !- Blowdown Concentration Ratio
  
            SetpointManager:Scheduled,
              EvapCoolerOutletTemp_SP_Mgr, !- Name
              Temperature, !- Control Variable
              EvapCoolerOutletTemp_SP_Sch, !- Schedule Name
              AHU Return Air Outlet; !- Setpoint Node or NodeList Name  
            
            Schedule:Compact,
              EvapCoolerOutletTemp_SP_Sch,
              Any Number,
              Through: 12/31,
              For: AllDays,
              Until: 06:00,  22,
              Until: 20:00,  22,
              Until: 24:00,  22;

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> That sounds like an evaporative cooler.
> 
> On 8/25/2011 11:50 AM, Jean marais wrote:
> >
> > Hi Everyone,
> > I have one large air handler that represents many smaller ones. The 
> > current real equipment has a special feature you may find interesting.
> >
> > They humidify the exhaust air at the entry node for the exhaust air 
> > just before the thermal wheel. Because the efficiencies of heat 
> > transfer for the summer case for the thermal wheel are better for 
> > sensible heat than latent heat, the humidified air drops in drybulb 
> > temperature whilst the humidity increases.
> >
> > I would like to change the air conditions at this node from whatever 
> > it is, to 22 deg C. What's the best way to achieve this? Using EMS or 
> > Building in a humidifier lance?
> >
> > 
> 
> -- 
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL  32922-5703
> Phone:   (321) 638-1454
> Fax:     (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
> 
> UCF - From Promise to Prominence: Celebrating 40 Years
>




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