Re: [EnergyPlus_Support] Re: Invalid air loop component

[Don Shirey <shirey@xxxxxxxxxxxx>]

There may be other ways to do this, but here is my suggestion:

Use DXSystem:AirLoop for the cooling coil and fan, with a Single 
Duct:VAV:Reheat air distribution unit that uses COIL:Water:SimpleHeating 
as the reheat component object.

See example file = 5ZoneAutoDXVAV.idf which is similar to what you are 
looking for, but that example file uses gas reheat coils instead of hot 
water reheat coils.

JV Dirkes II wrote:
> Dear Don,
>
> Following up on your suggestion, I have uncovered a couple more questions:
> The Unitary System or Furnace system are geared toward single zone
> applications (they require a controlling zone"), so they are less
> applicable to my multi-zone requirement.  
> I want to model a Terminal reheat system (ASHRAE 90.1 Baseline system
> #5) with a DX coil and hot water coil which maintain a constant
> discharge air temperature. The DXsystem: object lacks a heating coil,
> though, and I'm now trying to figure out how to add that into the air
> loop.
> It occurs to me that I could let E+ autosize a (relatively) monster
> reheat coil, but I'd rather get it to emulate the real system.  Any
> guidance for adding that heating coil to the air loop?
>
> Thanks!
>
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Don Shirey <shirey@...> wrote:
>   
>> In an air loop, this DX cooling coil must be included as part of
>>     
> another 
>   
>> "compound component" that controls how the DX coil operates.
>>
>> For example, the DX cooling coil could be part of   DXSystem:AirLoop  
>> or  UnitarySystem:HeatCool
>>
>> JV Dirkes II wrote:
>>     
>>> Dear E+ Forum,
>>>
>>> I'm getting an error which tells me that my coil is an invalid
>>> component.  I doubt that this is really the cause of the error.  Can
>>> someone give a suggestion regarding the cause?  Thanks!
>>>
>>>    ** Severe  ** Invalid Air Loop Component
>>> Type="COIL:DX:COOLINGBYPASSFACTOREMPIRICAL".
>>>    **   ~~~   ** ..Air Loop Component Name="CLGCOIL_AH1".
>>>    **   ~~~   ** ..Air Primary Loop=AIRLOOP_AH1
>>>    **   ~~~   ** ..Air Primary Loop Branch=BRANCH_AIRLOOP_AH1
>>>    **  Fatal  ** Errors found getting Air Primary Loop


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