You can not have two AirloopHVAC objects serving the same zone since only 1 return node is allowed per zone. And placing the heat pumps in series in a single AirloopHVAC object will probably not satisfy your needs, although you could try it.
You can also have 2 systems in the same zone by using the ZoneHVAC object. See the WindowAC or WSHP_DOAS example files.
On 2/4/2011 8:06 AM, Richard Raustad wrote:
This probably means that you did not list the heat pump in the AirloopHVAC branch list. Follow the "Branch List Name" in the AirloopHVAC object to find what is defined for that air loop.
AirLoopHVAC,
Air Loop Branches, !- Branch List Name
BranchList,
Air Loop Branches, !- Name
Air Loop Main Branch; !- Branch 1 Name
Branch,
Air Loop Main Branch, !- Name
1.7, !- Maximum Flow Rate {m3/s}
, !- Pressure Drop Curve Name
AirLoopHVAC:OutdoorAirSystem, !- Component 1 Object Type
OA Sys 1, !- Component 1 Name
Outdoor Air Mixer Inlet Node, !- Component 1 Inlet Node Name
Mixed Air Node, !- Component 1 Outlet Node Name
PASSIVE, !- Component 1 Branch Control Type
AirLoopHVAC:UnitaryHeatPump:AirToAir, !- Component 2 Object Type
DXAC Heat Pump 1, !- Component 2 Name
Mixed Air Node, !- Component 2 Inlet Node Name
Air Loop Outlet Node, !- Component 2 Outlet Node Name
ACTIVE; !- Component 2 Branch Control Type
On 2/4/2011 5:41 AM, Takashi_Toi wrote:I want to model 2 UnitaryHeatPump:AirToAir in one zone.
I set ZoneHVAC:EquipmentList, ZoneEquipment1 for first UnitaryHeatPump, ZoneEquipment2 for second UnitaryHeatPump.
But I had a severe error
" ** Severe ** AirLoopHVAC:UnitaryHeatPump:AirToAir = 1-HEAT_PUMP
** Severe ** Did not find correct AirLoopHVAC."
I model a UnitaryHeatPump:AirToAir and a FanCoil in one zone. But I had no Error.
-- 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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