Hi there,
I want to model a DOAS system in E+, of which the configuration is as follows. However, we have encountered some problems when trying to implement the series desiccant wheel (the orange one in the figure) in the air loop. I tried adding a heat exchanger to the existing air loop, but E+ seems to not allow an object to be referred to twice in an air loop. I tried different heat exchanger objects but none worked. Anyone knows a workaround for this?
I am attaching the proposed air loop branch and the error message to this mail for your reference.
Much appreciated!
! - Branch
Branch,
DOAS Main Branch, !- Name
, !- Pressure Drop Curve Name
AirLoopHVAC:OutdoorAirSystem, !- Component 1 Object Type
DOAS OA System, !- Component 1 Name
DOAS Air Loop Inlet, !- Component 1 Inlet Node Name
DOAS Mixed Air Outlet, !- Component 1 Outlet Node Name
HeatExchanger:AirToAir:SensibleAndLatent, !- Component 2 Object Type
DOAS Heat Recovery, !- Component 2 Name
DOAS Mixed Air Outlet, !- Component 2 Inlet Node Name
DOAS Heat Recovery Supply Outlet, !- Component 2 Outlet Node Name
Coil:Heating:Water, !- Component 3 Object Type
DOAS Heating Coil, !- Component 3 Name
DOAS Heat Recovery Supply Outlet, !- Component 3 Inlet Node Name
DOAS Heating Coil Outlet,!- Component 3 Outlet Node Name
HeatExchanger:Desiccant:BalancedFlow, !- Component 4 Object Type
Desiccant Wheel, !- Component 4 Name
DOAS Heating Coil Outlet,!- Component 4 Inlet Node Name
Desiccant Wheel Exchanger OA Outlet, !- Component 4 Outlet Node Name
Coil:Cooling:Water, !- Component 5 Object Type
DOAS Cooling Coil, !- Component 5 Name
Desiccant Wheel Exchanger OA Outlet, !- Component 5 Inlet Node Name
DOAS Cooling Coil Outlet,!- Component 5 Outlet Node Name
HeatExchanger:Desiccant:BalancedFlow, !- Component 6 Object Type
Desiccant Wheel, !- Component 6 Name
DOAS Cooling Coil Outlet,!- Component 6 Inlet Node Name
Desiccant Wheel Exchanger Outlet, !- Component 6 Outlet Node Name
Fan:VariableVolume, !- Component 7 Object Type
DOAS Supply Fan, !- Component 7 Name
Desiccant Wheel Exchanger Outlet, !- Component 7 Inlet Node Name
DOAS Supply Fan Outlet; !- Component 7 Outlet Node Name
* Severe * Same component name and type has differing Node Names.
* ~~~ * Component: HEATEXCHANGER:DESICCANT:BALANCEDFLOW, name=CA
* ~~~ * Nodes, inlet: DOAS HEATING COIL OUTLET, outlet: CA EXCHANGER OA OUTLET
* ~~~ * & Nodes, inlet: DOAS COOLING COIL OUTLET, outlet: CA EXCHANGER OUTLET
* ~~~ * Node Types: UNDEFINED & Process Air Nodes
