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[EnergyPlus_Support] Re: EvapCooler in exhaust stream
Thanks Richard, I'll try and shift the evap cooler into the ODA system on the exhaust side so that the program will call (simulate) it.
I had the evap cooler as the first item on my Main Airloop Branch, before the second componant (the ODA System).
I'm just wondering how my exhaust stream air got roughly to the specified (Setpoint Manager) temperature 22deg from the evap cooler equipment inlet node temperature which was 26deg. Could it be that the equipment got simulated anyway? How can I see if it's turning on or off? Should I monitor motor power consuption?
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> There are 4 air streams on an OA mixer ... the outdoor, exhaust, return,
> and mixed air. The return is connected to the combined zone air mixer
> outlet. The mixed air is connected to the air loop supply going to the
> zones. These 2 air steams are not considered part of the outdoor air
> system.
>
> The other 2 air streams, the outdoor and exhaust, and any equipment in
> one or both air streams, makes up the outdoor air system. Yes, the OA
> mixer is part of this outdoor air system too. So if your HX and evap
> cooler air in the outdoor air and/or exhaust air streams, then they are
> part of the OA system and should be listed in the outdoor air system
> equipment list.
>
> Here's an example from TermRhGenericOAHeatRecPreheat.idf. I told you
> before you don't need a controller, but I was referring to a water coil
> controller, not the OA controller. For your application, the evap cooler
> would replace the electric heating coil and be connected in the exhaust
> air stream. I don't really think it matters, in your case, if you list
> the evap cooler before the HX or after. But practice is to list in order
> from outdoor air node (in the example below, the air entering the
> heating coil) to the OA mixing boxes OA inlet (i.e., the Outdoor Air
> Stream Node Name input in the OutdoorAir:Mixer object). So the equipment
> list order in the example below is ... heater, HX, OA mixer)
>
> What you see here is the "Outdoor Air System". And notice that the
> equipment listed in AirLoopHVAC:OutdoorAirSystem:EquipmentList make up
> the entire OA system. If equipment is not listed here, it will not be
> called (simulated) by the program.
>
> AirLoopHVAC:OutdoorAirSystem,
> OA Sys 1, !- Name
> OA Sys 1 Controllers, !- Controller List Name
> OA Sys 1 Equipment, !- Outdoor Air Equipment List Name
> Reheat System 1 Avail List; !- Availability Manager List Name
>
> OutdoorAir:Mixer,
> OA Mixing Box 1, !- Name
> Mixed Air Node, !- Mixed Air Node Name
> Heat Recovery Outlet Node, !- Outdoor Air Stream Node Name
> Relief Air Outlet Node, !- Relief Air Stream Node Name
> Air Loop Inlet Node; !- Return Air Stream Node Name
>
> AirLoopHVAC:ControllerList,
> OA Sys 1 Controllers, !- Name
> Controller:OutdoorAir, !- Controller 1 Object Type
> OA Controller 1; !- Controller 1 Name
>
> AirLoopHVAC:OutdoorAirSystem:EquipmentList,
> OA Sys 1 Equipment, !- Name
> Coil:Heating:Electric, !- Component 1 Object Type
> Outdoor Air Preheat Coil,!- Component 1 Name
> HeatExchanger:AirToAir:SensibleAndLatent, !- Component 2 Object Type
> OA Heat Recovery 1, !- Component 2 Name
> OutdoorAir:Mixer, !- Component 3 Object Type
> OA Mixing Box 1; !- Component 3 Name
>
> Controller:OutdoorAir,
> OA Controller 1, !- Name
> Relief Air Outlet Node, !- Relief Air Outlet Node Name
> Air Loop Inlet Node, !- Return Air Node Name
> Mixed Air Node, !- Mixed Air Node Name
> Outside Air Inlet Node, !- Actuator Node Name
> 0.4333, !- Minimum Outdoor Air Flow Rate {m3/s}
> 1.3, !- Maximum Outdoor Air Flow Rate {m3/s}
> NoEconomizer, !- Economizer Control Type
> ModulateFlow, !- Economizer Control Action Type
> 19., !- Economizer Maximum Limit Dry-Bulb
> Temperature {C}
> , !- Economizer Maximum Limit Enthalpy {J/kg}
> , !- Economizer Maximum Limit Dewpoint
> Temperature {C}
> , !- Electronic Enthalpy Limit Curve Name
> 4., !- Economizer Minimum Limit Dry-Bulb
> Temperature {C}
> NoLockout, !- Lockout Type
> FixedMinimum; !- Minimum Limit Type
>
> Coil:Heating:Electric,
> Outdoor Air Preheat Coil,!- Name
> FanAndCoilAvailSched, !- Availability Schedule Name
> 1.0, !- Efficiency
> 2000, !- Nominal Capacity {W}
> Outside Air Inlet Node, !- Air Inlet Node Name
> Outside Air Inlet Node Preheated, !- Air Outlet Node Name
> Outside Air Inlet Node Preheated; !- Temperature Setpoint Node Name
>
> HeatExchanger:AirToAir:SensibleAndLatent,
> OA Heat Recovery 1, !- Name
> FanAndCoilAvailSched, !- Availability Schedule Name
> 0.4333, !- Nominal Supply Air Flow Rate {m3/s}
> .76, !- Sensible Effectiveness at 100% Heating
> Air Flow {dimensionless}
> .68, !- Latent Effectiveness at 100% Heating
> Air Flow {dimensionless}
> .81, !- Sensible Effectiveness at 75% Heating
> Air Flow {dimensionless}
> .73, !- Latent Effectiveness at 75% Heating Air
> Flow {dimensionless}
> .76, !- Sensible Effectiveness at 100% Cooling
> Air Flow {dimensionless}
> .68, !- Latent Effectiveness at 100% Cooling
> Air Flow {dimensionless}
> .81, !- Sensible Effectiveness at 75% Cooling
> Air Flow {dimensionless}
> .73, !- Latent Effectiveness at 75% Cooling Air
> Flow {dimensionless}
> Outside Air Inlet Node Preheated, !- Supply Air Inlet Node Name
> Heat Recovery Outlet Node, !- Supply Air Outlet Node Name
> Relief Air Outlet Node, !- Exhaust Air Inlet Node Name
> Heat Recovery Secondary Outlet Node, !- Exhaust Air Outlet Node Name
> 200.0, !- Nominal Electric Power {W}
> No, !- Supply Air Outlet Temperature Control
> Plate, !- Heat Exchanger Type
> None; !- Frost Control Type
>
>
>
> On 8/26/2011 1:09 PM, Jean marais wrote:
> >
> > Bear in mind I have a 100% ODA system. The mixing box (ODA system) is
> > not doing much. My evaporator is before the ODA equipment, not in it.
> > That means the exhaust air is cooled down before reaching the HX, so
> > that I over-cool the already cool room exhaust air. This has a greater
> > exchange rate at the HX (in the ODA system with the other ODA
> > equipment) with the incoming ODA.
> >
> > --- In EnergyPlus_Support@xxxxxxxxxxxxxxx
> > <mailto:EnergyPlus_Support%40yahoogroups.com>, Richard Raustad
> > <RRaustad@> wrote:
> > >
> > > "...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
> > <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > <mailto:EnergyPlus_Support%40yahoogroups.com>, 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>
> > > > <mailto:EnergyPlus_Support%40yahoogroups.com>
> > > > > > <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
> > >
> >
> >
>
> --
> 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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