Re: [EnergyPlus_Support] VAV system without reheat coils

["Richard J. Liesen" <r-liesen@xxxxxxxx>]

Hello,

Here is the example that I have working for myself starting with the
example "VAVSingleDuctReheat.idf".  For the Zone 1 VAV box
you can see what lines  were changed to a null input and I commented
out the Reheat Coil.  The 2nd zone remains with a Reheat Coil and
you should see the differences betrween the objects.  Also make sure
that you have the new version 1.0.3 EnergyPlus executable which allows
for this scenario and does not produce the error message.


  SINGLE DUCT:VAV:REHEAT,
    Zone 1 VAV System,  !- Name of System
    FanAndCoilAvailSched,  !- Availability schedule
for VAV System
    Zone 1 Reheat Air Outlet Node,  !- Damper Outlet
Node
    Zone 1 Damper Inlet Node,  !- Damper Inlet
Node
    0.47,  !- Maximum air flow rate {m3/s}
    0.8,  !- Min air flow
    ,  !- Control node
    ,  !- Reheat Component Object
    ,  !- Name of Reheat Component
    ,  !- Max Reheat Water Flow {m3/s}
    ,  !- Min Reheat Water Flow {m3/s}
    Zone 1 Reheat Air Outlet Node,  !- Reheat Air
Outlet Node
    ;  !- Convergence Tolerance
 
  SINGLE DUCT:VAV:REHEAT,
    Zone 2 VAV System,  !- Name of System
    FanAndCoilAvailSched,  !- Availability schedule
for VAV System
    Zone 2 Reheat Air Inlet Node,  !- Damper Outlet
Node
    Zone 2 Damper Inlet Node,  !- Damper Inlet
Node
    0.36,  !- Maximum air flow rate {m3/s}
    0.3,  !- Min air flow
    Zone 2 Reheat Water Inlet Node,  !- Control
node
    COIL:Water:SimpleHeating,  !- Reheat Component
Object
    Reheat Coil Zone 2,  !- Name of Reheat
Component
    0.0013,  !- Max Reheat Water Flow {m3/s}
    0.0,  !- Min Reheat Water Flow {m3/s}
    Zone 2 Reheat Air Outlet Node,  !- Reheat Air
Outlet Node
    0.001;  !- Convergence Tolerance
 
 
 ! COIL:Water:SimpleHeating,
 !   Reheat Coil Zone 1,  !- Coil Name
 !   FanAndCoilAvailSched,  !- Available
Schedule
 !   400.0,  !- UA of the Coil {W/K}
 !   0.0013,  !- Max Water Flow Rate of Coil
{m3/s}
 !   Zone 1 Reheat Water Inlet Node,  !-
Coil_Water_Inlet_Node
 !   Zone 1 Reheat Water Outlet Node,  !-
Coil_Water_Outlet_Node
 !   Zone 1 Reheat Air Inlet Node,  !-
Coil_Air_Inlet_Node
 !   Zone 1 Reheat Air Outlet Node;  !-
Coil_Air_Outlet_Node
 
  COIL:Water:SimpleHeating,
    Reheat Coil Zone 2,  !- Coil Name
    FanAndCoilAvailSched,  !- Available 
Schedule
    400.0,  !- UA of the Coil {W/K}
    0.0013,  !- Max Water Flow Rate of Coil
{m3/s}
    Zone 2 Reheat Water Inlet Node,  !-
Coil_Water_Inlet_Node
    Zone 2 Reheat Water Outlet Node,  !-
Coil_Water_Outlet_Node
    Zone 2 Reheat Air Inlet Node,  !-
Coil_Air_Inlet_Node
    Zone 2 Reheat Air Outlet Node;  !-
Coil_Air_Outlet_Node

Thanks
Dr. Richard Liesen
Associate Director, Building Systems Laboratory
Department of Mechanical and Industrial Engineering
University of Illinois at Urbana-Champaign
www.bso.uiuc.edu


At 11:03 PM 12/5/2002, HSIEH Chun-Ming wrote:

Hello:

Thank you for adding the possibility to simulate a VAV system without
reheat coils.
I started from the example "VAVSingleDuctReheat.idf",
and left some fields to be blank according to the input-output reference
(P433-434).
But I got the severe messages as follows:

   ** Severe  ** During Single Duct:VAV:Reheat Input, Invalid Component
Type input=
   **   ~~~   ** Component name=
   **   ~~~   ** In Single Duct:VAV:Reheat=ZONE 1 VAV SYSTEM
   **  Fatal  ** Errors found in getting Sys input

Do I forgot to do something else,
for example: to delect the Coil:Water:SimpleHeating, the branch of
heating system or something like that?
What I want is to simualte a VAV cooling system(only with cooling coil,
but without reheat and heating coil).
Is there any example?

Thank you very much.

Chunming

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