RE: [EnergyPlus_Support] Inserting Exhaust Fan - Severe ** AirflowNetwork:MultiZone:Component:Zon

If the error is severe and not fatal, leave it for a while.

It may become clearer when you make some other changes.

For example, add an open window instead of a crack. Change the damper position of the inlet air, etc.

'ReferenceCrackConditions' may be a problem as well. How do you install an exhaust fan in a crack?

I have not used the AFN myself, but have noticed the correct use of these References are important.

Why do you need AFN to install an exhaust fan to a WC zone?

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: jeannieboef@xxxxxxxxx
Date: Fri, 12 Aug 2011 08:23:21 +0000
Subject: [EnergyPlus_Support] Inserting Exhaust Fan - Severe ** AirflowNetwork:MultiZone:Component:Zon

Please HELP

Severe ** AirflowNetwork:MultiZone:Component:ZoneExhaustFan = 118204 XFAN1 WC is defined and never used.

ZoneHVAC:EquipmentConnections,
118403, !- Zone Name
118403Equipment, !- Zone Conditioning Equipment List Name
118403 Zone Equip Inlet, !- Zone Air Inlet Node or NodeList Name
118403 WC Exhaust Air Nodes List, !- Zone Air Exhaust Node or NodeList Name
118403 Zone Air Node, !- Zone Air Node Name
118403 Return Outlet; !- Zone Return Air Node Name

NodeList,
118403 WC Exhaust Air Nodes List,
118403 WC Exhaust Air Node1; !- Node ID

AirflowNetwork:MultiZone:Surface,
R_118403_5_0_0, !- Surface Name
118403 WC, !- Leakage Component Name
118403 Horizontal, !- External Node Name
1.0; !- Window/Door Opening Factor, or Crack Factor {dimensionless}

!Node Required per Surface
AirflowNetwork:MultiZone:ExternalNode,
118403 Horizontal,!- Name
5.00, !- External Node Height {m}
HorizontalWPC;!- Wind Pressure Coefficient Values Object Name

AirflowNetwork:MultiZone:Surface:EffectiveLeakageArea,
118403 WC, !- Name
0.002, !- Effective Leakage Area {m2}
1.0, !- Discharge Coefficient {dimensionless}
4.0, !- Reference Pressure Difference {Pa}
0.667; !- Air Mass Flow Exponent {dimensionless}

AirflowNetwork:MultiZone:Component:ZoneExhaustFan,
118403 XFan1 WC, !- Name
0.01, !- Air Mass Flow Coefficient When the Zone Exhaust Fan is Off at Reference Conditions {kg/s}
0.667; !- Air Mass Flow Exponent When the Zone Exhaust Fan is Off{dimensionless}
ReferenceCrackConditions; !- Reference Crack Conditions

ZoneHVAC:EquipmentList,
118403Equipment, !- Name
AirTerminal:SingleDuct:Uncontrolled, !- Zone Equipment 1 Object Type
118403AirTerminal:SingleDuct:Uncontrolled, !- Zone Equipment 1 Name
1, !- Zone Equipment 1 Cooling Sequence
1, !- Zone Equipment 2 Heating or No-Load Sequence
Fan:ZoneExhaust, !- Zone Equipment 2 Object Type
118403 XFan1 WC, !- Zone Equipment 2 Name
2, !- Zone Equipment 2 Cooling Sequence
2;

!!!!!!!!!!!!!!!Exhaust Fan WC Start

Fan:ZoneExhaust,
118403 XFan1 WC, !- Name WC Exhaust Fan
HVACTemplate-Always 1, !- Availability Schedule Name
0.7, !- Fan Efficiency
142, !- Pressure Rise {Pa}
0.0166666, !- Mech ventilation (m3/s) 60 m³/h
118403 WC Exhaust Air Node1, !- Air Inlet Node Name
118403 WC Outside Node1, !- Air Outlet Node Name
WC Exhaust; !- End-Use Subcategory
!!!!!!!!!!!!!!!Exhaust Fan WC End

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