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How to use a Heating Coil to condition Outdoor Air before the Air Mixer?

asked 2019-06-17 18:09:26 -0600

mldichter gravatar image

I want to use a heating coil to heat the outdoor air prior to the outdoor air mixing with the airloop return air in the mixing box. The heating coil would be more efficient since the outdoor air is colder than the mixed outdoor air and airloop return air. However, I can't figure out how to place the heating coil since I only know how to place a heating coil in the airloop, not between the outdoor air node and outdoor air mixer. Any idea on how to do this?

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answered 2019-06-19 12:35:12 -0600

updated 2019-06-20 07:50:32 -0600

You would place the heating coil in the outdoor air system equipment list. Not all coil types are allowed. For example, a DX coil would need to be wrapped in a CoilSystem object. Coils in the outdoor air system are always set point based control, meaning that a set point manager is used to place a temperature set point at the coil outlet node.

AirLoopHVAC:OutdoorAirSystem,
  OA Sys 1,                !- Name
  OA Sys 1 Controllers,    !- Controller List Name
  OA Sys 1 Equipment,      !- Outdoor Air Equipment List Name
  VAV Sys 1 Avail List;    !- Availability Manager List Name

AirLoopHVAC:OutdoorAirSystem:EquipmentList,
  OA Sys 1 Equipment,      !- Name
  Coil:Heating:Electric,   !- Component 1 Object Type
  My OA Heating Coil,      !- Component 1 Name
  OutdoorAir:Mixer,        !- Component 2 Object Type
  OA Mixing Box 1;         !- Component 2 Name

Valid coil types in the outdoor air system:

Coil:Heating:Electric
Coil:Heating:Fuel
Coil:Heating:Steam
Coil:Heating:Water
Coil:Cooling:Water
Coil:Cooling:Water:DetailedGeometry
CoilSystem:Cooling:Water:HeatexchangerAssisted
CoilSystem:Cooling:DX
CoilSystem:Heating:DX
CoilSystem:UserDefined

Valid non-coil types in the outdoor air system:

OutdoorAir:Mixer
Fan:SystemModel
Fan:ComponentModel
Fan:VariableVolume (scheduled for deprication after V9.2)
Fan:ConstantVolume (scheduled for deprication after V9.2)
AirLoopHVAC:UnitarySystem
HeatExchanger:AirToAir:FlatPlate
HeatExchanger:AirToAir:SensibleAndLatent
HeatExchanger:Desiccant:BalancedFlow
Dehumidifier:Desiccant:NoFans
Humidifier:Steam:Electric
SolarCollector:UnglazedTranspired
SolarCollector:FlatPlate:PhotovoltaicThermal
EvaporativeCooler:Direct:CelDekPad
EvaporativeCooler:Indirect:CelDekPad
EvaporativeCooler:Indirect:WetCoil
EvaporativeCooler:Indirect:ResearchSpecial
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Asked: 2019-06-17 18:09:26 -0600

Seen: 176 times

Last updated: Jun 20 '19