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Re: [EnergyPlus_Support] Passive Desiccant Wheel
One more thing. These warnings are simply meant to help you find node
connection errors. They do not mean that the simulation "can not" run.
Your file may be working correctly. Look at the node mass flow rates and
temperates entering and leaving the desiccant heat exchanger and see if
it is working as you expect.
Richard Raustad wrote:
> I am not sure if you can connect the
> HeatExchanger:Desiccant:BalancedFlow object directly into the outside
> air path or if it needs to be included in a
> Dehumidifier:Desiccant:System object. Look at the example file
> DesiccantDehumidifierWithCompanionCoil and search for "OA Desiccant
> System". Maybe you can make the fan power and heating coil capacity 0
> (or very near 0) to get your system to operate passively.
>
> cjm23113 wrote:
>
>> Does anyone know if it is possible to model a passive desiccant wheel?
>> What I would like to model would be:
>>
>> Process Air Stream:
>>
>> HeatExchanger:AirToAir:SensibleAndLatent -> OutdoorAir:Mixer ->
>> Fan:ConstantVolume -> Coil:Cooling:Water ->
>> HeatExchanger:Desiccant:BalancedFlow -> Coil:Heating:Water
>>
>> The regeneration air stream for the desiccant wheel would be the
>> relief air stream:
>>
>> OutdoorAir:Mixer -> HeatExchanger:Desiccant:BalancedFlow ->
>> HeatExchanger:AirToAir:SensibleAndLatent
>>
>> I have tried several configurations of the regen nodes without any
>> success. I keep crashing with node errors:
>>
>> ** Severe ** Same component name and type has differing Node Names.
>> ** ~~~ ** Component: HEATEXCHANGER:DESICCANT:BALANCEDFLOW,
>> name=DESICCANT HEAT EXCHANGER
>> ** ~~~ ** Nodes, inlet: COOLING COIL OUTLET, outlet: HX PROCESS OUTLET
>> NODE
>> ** ~~~ ** & Nodes, inlet: RELIEF AIR OUTLET, outlet: HX REGEN OUTLET NODE
>> ** ~~~ ** Node Types: UNDEFINED & Process Air Nodes
>> ** Warning ** Potential Node Connection Error for object
>> HEATEXCHANGER:DESICCANT:BALANCEDFLOW, name=DESICCANT HEAT EXCHANGER
>> ** ~~~ ** Node Types are still UNDEFINED -- See Branch/Node Details
>> file for further information
>> ** ~~~ ** Inlet Node : COOLING COIL OUTLET
>> ** ~~~ ** Outlet Node: HX PROCESS OUTLET NODE
>> ** Warning ** Node Connection Error for object
>> HEATEXCHANGER:DESICCANT:BALANCEDFLOW, name=DESICCANT HEAT EXCHANGER
>> ** ~~~ ** Process Air Nodes not on any Branch or Parent Object
>> ** ~~~ ** Inlet Node : RELIEF AIR OUTLET
>> ** ~~~ ** Outlet Node: HX REGEN OUTLET NODE
>>
>>
>>
>
>
--
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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