Re: [EnergyPlus_Support] Re: Full Fresh Air system with heat recovery and NO heating or cooling coils in loop

[fred buhl <wfbuhl@xxxxxxx>]

Not sure what your system looks like. Your Controller:Outside Air object 
looks
fine. What you should note is that all all central air systems in 
EnergyPlus are loops.
That is, they are configured for recirculated air even if there is none. 
The air loop
does not need heating or cooling coil or any kind of controller. All it nees
is at least 1 component. The Controller:Outside Air
can not be assigned to the Air Primary Loop in the controller list. It 
should be part
of the Outside Air System, named in its controller list.

Fred

Elmer Morrissey wrote:

>Hi Fred,
>
>I've set my OA controller to the following..
>
>CONTROLLER:OUTSIDE AIR,
>    AHU1 OA Controller,      !- Name
>    NO ECONOMIZER,           !- EconomizerChoice
>    NO RETURN AIR TEMP LIMIT,!- ReturnAirTempLimit
>    NO RETURN AIR ENTHALPY LIMIT,  !- ReturnAirEnthalpyLimit
>    NO LOCKOUT,              !- Lockout
>    PROPORTIONAL MINIMUM,    !- MinimumLimit
>    AHU1 Supply Fan Inlet Node,  !- Control_Node
>    AHU1 OA Inlet Node,      !- Actuated_Node
>    0.21,                     !- minimum outside air flow rate {m3/s}
>    0.21,                    !- maximum outside air flow rate {m3/s}
>    19,                      !- temperature limit {C}
>    4,                       !- temperature lower limit {C}
>    0,                       !- enthalpy limit {J/kg}
>    AHU1 MB Relief Air  Outlet Node,  !- Relief_Air_Outlet_Node
>    AHU1 Extract Fan Outlet Node;  !- Return_Air_Node
>
>Do I need an econmizer for what I am proposing to do? 
>
>What would be the correct course of action in order to remove my 
>error for the fatal error described below that seems to insist on a 
>Controller:Simple even though I do not have a heating coil or a 
>cooling coil? Do I need to insert a fake cooling coil with dummy 
>controls?
>
>Kind regards
>
>-Elmer
>
>--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, fred buhl <wfbuhl@l...> 
>wrote:
>  
>
>>You'll need to pretend that the system is a recirc system with 
>>    
>>
>outside 
>  
>
>>air - ie a normal
>>VAV system. You will need to set the minimum OA to the total flow 
>>    
>>
>rate. 
>  
>
>>The heat recovery
>>unit will be in the OA system. Probably need to set MinimumLimit 
>>    
>>
>to 
>  
>
>>Proportional Minimum
>>in the controller:outside air.
>>
>>Fred Buhl
>>
>>Elmer Morrissey wrote:
>>
>>    
>>
>>>Hello all,
>>>
>>>Has anyone modelled a Single Duct VAV system that takes full 
>>>      
>>>
>fresh 
>  
>
>>>air which moderates all zonal loads through a heat recovery unit 
>>>only?
>>>
>>>I received this fatal error...
>>>
>>>  **  Fatal  ** ManageControllers: Invalid controller=AHU1 OA 
>>>CONTROLLER. The only valid controller type for an Air Primary 
>>>      
>>>
>Loop 
>  
>
>>>is CONTROLLER:SIMPLE.
>>>  ************* Fatal error -- final processing.  More error 
>>>messages may appear.
>>>
>>>I don't have a CONTROLLER:SIMPLE because my AHU does NOT contain 
>>>      
>>>
>a 
>  
>
>>>cooling coil or a heating coil. The facility's system designers 
>>>expect the rotary wheel will moderate all sensible and latent 
>>>      
>>>
>loads 
>  
>
>>>in their entirety. 
>>>
>>>Does anyone have any ideas how I could emulate such a system?
>>>
>>>Does anyone have an example file of a FULL fresh air system with 
>>>      
>>>
>NO 
>  
>
>>>recirc air?
>>>
>>>Kind regards
>>>
>>>-Elmer
>>>
>>>
>>>
>>>
>>>
>>>
>>>The primary EnergyPlus web site is found at:
>>>http://www.energyplus.gov
>>>
>>>The group web site is:
>>>http://groups.yahoo.com/group/EnergyPlus_Support/
>>>
>>>Attachments are not allowed -- please post any files to the 
>>>      
>>>
>appropriate folder in the Files area of the Support Web Site.
>  
>
>>>EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf 
>>>      
>>>
>and press the "search" button.
>  
>
>>>Yahoo! Groups Links
>>>
>>>
>>>
>>>
>>>
>>>
>>> 
>>>
>>>      
>>>
>
>
>
>
>
>
>
>The primary EnergyPlus web site is found at:
>http://www.energyplus.gov
>
>The group web site is:
>http://groups.yahoo.com/group/EnergyPlus_Support/
>
>Attachments are not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.
>
>EnergyPlus Documentation is searchable.  Open EPlusMainMenu.idf and press the "search" button.
> 
>Yahoo! Groups Links
>
>
>
> 
>
>
>  
>


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