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[EnergyPlus_Support] Re: AHU Test



Hi Fred,

I hope your vacation went well. Have you gotton a chance to take a
look at this? 

Kind regards

-Elmer

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, fred buhl <wfbuhl@...> wrote:
>
> Elmer - I'll have to take a look at this when I get back from vacation 
> (August 14). At least the
> controllers aren't fighting each other any more
> 
> Fred
> 
> Elmer Morrissey wrote:
> 
> >Hi Fred,
> >
> >I made the alteration you suggested. Thank you very much.
> >
> >Unfortunately, the conditions off-cooling-coil are not maintained 
> >100% of the time. On the 5th day, the off coil conditions creep up 
> >from the 11.5C setpoint up to 14C (This is for 100% FA in a 
> >London/UK climate). I cannot seem to resovle this issue.
> >
> >I have tried: 
> >
> >increasing the capacity of the cooling coil
> >increasing the flowrate of chilled water
> >and
> >using the WaterCooling definition of cooling coil but this seems to 
> >make my problems a little worse.
> >
> >Could you or anyone suggest anything?
> >
> >Kind regards
> >
> >-Elmer
> >
> >
> >--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, fred buhl <wfbuhl@> 
> >wrote:
> >  
> >
> >>The Controllers on the water coils operate sequentially. In this 
> >>    
> >>
> >case 
> >  
> >
> >>the cooling
> >>coil controller needs to go first, and the HW coil controller 
> >>    
> >>
> >second. So 
> >  
> >
> >>change
> >>your input:
> >>
> >>CONTROLLER LIST,
> >>    AHU1:ControlList,        !- Name
> >>    Controller:Simple,       !- Controller Type 1
> >>    HC:Controller,           !- Controller Name 1
> >>    Controller:Simple,       !- Controller Type 2
> >>    CC:Controller;           !- Controller Name 2
> >>
> >>to:
> >>
> >>CONTROLLER LIST,
> >>    AHU1:ControlList,        !- Name
> >>    Controller:Simple,       !- Controller Type 2
> >>    CC:Controller,           !- Controller Name 2
> >>    Controller:Simple,       !- Controller Type 1
> >>    HC:Controller;           !- Controller Name 1
> >>
> >>Elmer Morrissey wrote:
> >>
> >>    
> >>
> >>>Hello all,
> >>>
> >>>I am having difficulty with the controls on an AHU. The AHU 
> >>>      
> >>>
> >consists of:
> >  
> >
> >>>Fresh Air -> Cooling Coil -> Heating Coil -> Supply Fan -> Zone
> >>>
> >>>The run period takes place over the first seven days in London. 
> >>>      
> >>>
> >The
> >  
> >
> >>>AHU is a constant volume system
> >>>
> >>>The cooling coil cools the air to 11.5C
> >>>The heating coil heats the air back up to 16C
> >>>
> >>>Unfortunately, the heating coil does not engage adequately. After
> >>>numerous attempts, it seems that the heating coil does not `sense'
> >>>that the air has been cooled to 11.5C. The heating coil is only
> >>>engaged when the outside air is below 16C (it does not realise 
> >>>      
> >>>
> >that
> >  
> >
> >>>the air has been cooled by the cooling coil). 
> >>>
> >>>I have uploaded my file to the problem submittals. It is called 
> >>>      
> >>>
> >Test
> >  
> >
> >>>baseboardAHU1.idf .
> >>>
> >>>Additional Info:
> >>>
> >>>All additional heating in the zone is supplemented by a baseboard
> >>>heater system and the zone is maintained at 23C. As outlined
> >>>previously, the system is a full fresh air constant volume system.
> >>>Regardless of the outside conditions, I require the air to be 
> >>>      
> >>>
> >cooled
> >  
> >
> >>>to 11.5C and heated to 16C before it hits the supply fan. It is
> >>>supplied directly to the zone after this.
> >>>
> >>>Can anyone spot how I may fix this problem?
> >>>
> >>>Kind regards
> >>>
> >>>-Elmer Morrissey
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>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
> >
> >
> >
> > 
> >
> >
> >  
> >
> 
> 
> [Non-text portions of this message have been removed]
>







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