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Re: [EnergyPlus_Support] No Design Heating Load





asheaffe wrote:

>I am running a simulation where I have a compact vav system with hot 
>water reheat.  I keep getting errors saying that I have no heating 
>load for my interior zones, which makes me think that the outside air 
>controls that I have on the system are not set up right.  I have set 
>up outside air flow/person on the zone level for all zones in the 
>building.  I was under the impression that the program uses these 
>flows and max occupancy rates to determine the minimum outside 
>airflow for each zone.  Is this true?
>  
>
Yes; but zone design heating loads don't include outside air. As long as 
the user des air flow rates
are what you input, you are OK.

Fred Buhl

>The exterior zones are not returing this error (Zone 1S is an example 
>shown below), only the interior ones are (Zone 1SCore is an example 
>shown below).  Anyone see a reason why I am getting zero heating load 
>when I assume that the outside air flow/person is passed to the 
>system level in the sizing routine?
>
>Also, on the eio output, it says that the calc des air flow rate for 
>these zones is zero, while the user des air flow rates are identical 
>to the ones I entered.  
>
>Thanks,
>
>Andrew
>
>   ** Warning ** Calculated design heating load for zone=1SCORE is 
>zero.
>   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC 
>inputs.
>   ** Warning ** Calculated design heating load for zone=1NCORE is 
>zero.
>   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC 
>inputs.
>   ** Warning ** Calculated design heating load for zone=2SCORE is 
>zero.
>   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC 
>inputs.
>   ** Warning ** Calculated design heating load for zone=2NCORE is 
>zero.
>   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC 
>inputs.
>   ** Warning ** Calculated design heating load for zone=3SCORE is 
>zero.
>   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC 
>inputs.
>   ** Warning ** Calculated design heating load for zone=3NCORE is 
>zero.
>   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC 
>inputs.
>   ** Warning ** Calculated design heating load for zone=4SCORE is 
>zero.
>   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC 
>inputs.
>   ** Warning ** Calculated design heating load for zone=5NCORE is 
>zero.
>   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC 
>inputs.
>   ** Warning ** Calculated design heating load for zone=4NCORE is 
>zero.
>   **   ~~~   ** Check ZONE SIZING and ZONE CONTROL:THERMOSTATIC 
>inputs.
>   
>   
>  
>!-   ===========  ALL OBJECTS IN CLASS: COMPACT HVAC:ZONE:VAV 
>===========   
>   COMPACT HVAC:ZONE:VAV,
>    1S,                      !- Zone Name
>    VAV Sys Pat 1,           !- Air Handling System Name
>    All Zones,               !- Thermostat Name
>    autosize,                !- Zone Supply Air Max Flow Rate {m3/s}
>    0.3,                     !- Zone Supply Air Min Flow Fraction
>    flow/person,             !- Zone Outside Air Flow Type
>    1.18000014980471E-02,    !- Zone Outside Air Flow Rate {m3/s}
>    Hot Water,               !- Reheat Coil Type
>    On,                      !- Reheat Coil Availability Schedule
>    Reverse Action,          !- Zone Damper Heating Action
>    ,                        !- Zone Supply Plenum Name
>    ;                        !- Zone Return Plenum Name
>
>COMPACT HVAC:ZONE:VAV,
>    1SCore,                  !- Zone Name
>    VAV Sys Office,          !- Air Handling System Name
>    All Zones,               !- Thermostat Name
>    autosize,                !- Zone Supply Air Max Flow Rate {m3/s}
>    0.3,                     !- Zone Supply Air Min Flow Fraction
>    flow/person,             !- Zone Outside Air Flow Type
>    0.008024001018672,       !- Zone Outside Air Flow Rate {m3/s}
>    Hot Water,               !- Reheat Coil Type
>    On,                      !- Reheat Coil Availability Schedule
>    Reverse Action,          !- Zone Damper Heating Action
>    ,                        !- Zone Supply Plenum Name
>    ;                        !- Zone Return Plenum Name
>   
>   
>    
>   
>   
>   
>     ===========  ALL OBJECTS IN CLASS: COMPACT HVAC:SYSTEM:VAV 
>===========
>
>COMPACT HVAC:SYSTEM:VAV,
>    VAV Sys Pat 1,           !- Air Handling System Name
>    On,                      !- System Availability Schedule
>    autosize,                !- Supply Fan Max Flow Rate {m3/s}
>    autosize,                !- Supply Fan Min Flow Rate {m3/s}
>    0.7,                     !- Supply Fan Total Efficiency
>    600,                     !- Supply Fan Delta Pressure {Pa}
>    0.9,                     !- Supply Fan Motor Efficiency
>    1,                       !- Supply Fan Motor in Air Stream 
>Fraction
>    Chilled Water,           !- Cooling Coil Type
>    ,                        !- Cooling Coil Availability Schedule
>    ,                        !- Cooling Coil Setpoint Schedule
>    13.1,                    !- Cooling Coil Design Setpoint {C}
>    Hot Water,               !- Heating Coil Type
>    ,                        !- Heating Coil Availability Schedule
>    ,                        !- Heating Coil Setpoint Schedule
>    13,                      !- Heating Coil Design Setpoint {C}
>    0.8,                     !- Gas Heating Coil Efficiency
>    ,                        !- Gas Heating Coil Parasitic Electric 
>Load {W}
>    None,                    !- Preheat Coil Type
>    ,                        !- Preheat Coil Availability Schedule
>    ,                        !- Preheat Coil Setpoint Schedule
>    ,                        !- Preheat Coil Design Setpoint {C}
>    0.8,                     !- Gas Preheat Coil Efficiency
>    ,                        !- Gas Preheat Coil Parasitic Electric 
>Load {W}
>    autosize,                !- Maximum Outside Air Flow Rate {m3/s}
>    autosize,                !- Minimum Outside Air Flow Rate {m3/s}
>    FIXED MINIMUM,           !- Minimum Outside Air Control Type
>    ,                        !- Minimum Outside Air Schedule Name
>    Return air temperature,  !- Economizer Type
>    NO LOCKOUT,              !- Economizer Lockout
>    19,                      !- Economizer Upper Temperature Limit {C}
>    4,                       !- Economizer Lower Temperature Limit {C}
>    ,                        !- Economizer Upper Enthalpy Limit {J/kg}
>    ,                        !- Supply Plenum Name
>    ,                        !- Return Plenum Name
>    Draw Through,            !- Supply Fan Placement
>    ,                        !- Supply Fan Part-Load Power 
>Coefficients
>    Cycle On Any,            !- Night Cycle Control
>    ,                        !- Night Cycle Control Zone Name
>    ,                        !- Heat Recovery Type
>    ,                        !- Sensible Heat Recovery Effectiveness
>    ,                        !- Latent Heat Recovery Effectiveness
>    None,                    !- Cooling Coil Setpoint Reset Type
>    None;                    !- Heating Coil Setpoint Reset Type
>    
>    
>    
>    
>    
>    
>   
>   
>   
>
>
>
>
>
>
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>
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>
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>
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> 
>Yahoo! Groups Links
>
>
>
>
>
>
> 
>
>  
>


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