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Re: [EnergyPlus_Support] Re: EvapCooler in exhaust stream





"...just before the Outdoor Air Equipment"

I do not know what you mean by that. If it's working, then is must not be in the Outdoor Air System, which is where I thought you wanted it. I say this because you say the evap cooler is working, yet it is not listed in the outdoor air system equipment list.

Why would you put it in the return path? Where exactly is your HX and evap cooler. Be specific.

On 8/26/2011 12:27 PM, Jean marais wrote:
 

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
>


-- 
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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