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Re: [EnergyPlus_Support] Passive Desiccant Wheel
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
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