Re: [EnergyPlus_Support] Re: EvapCooler in exhaust stream

This worked without a controller, not in the return path (which only handles plenum objects), but just before the Outdoor Air Equipment. I did not list it there. (what's the implication) The respective node temperatures and humidities look good. The extra win from the heat wheel is not as much as expected.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> Yes, give it a shot. The evap cooler does not have a water coil so you
> do not need a controller, just the set point manager as you show. Make
> sure to list the evap cooler in the OA system equipment list. Equipment
> should be listed in order from outdoor air node to the mixer inlet node.
>
>
> On 8/26/2011 3:43 AM, Jean marais wrote:
> >
> > 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
> > <mailto:EnergyPlus_Support%40yahoogroups.com>, 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
> > >
> >
> >
>
> --
> 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
>