Re: [EnergyPlus_Support] Question on example file 5ZoneVAV-Pri-SecLoop.idf

["Michael J. Witte" <mjwitte@xxxxxxxx>]

One controls the central heating coil, and the other controls the 
central cooling coil.  In this example, they are both active at all 
times.  If the mixed air temp is below 10C, then the heating coil will 
operate to bring it to 10C (less fan heat).  If the mixed air temp is 
above 14C, then the cooling coil will operate to lower it to 14C (less 
fan heat). The heating coil setpoint is below the cooling coil setpoint 
to prevent battling of the two coils.  The central heating coil is just 
acting to preheat the supply air and the zone-level reheat coils add the 
final amount of heating to meet each zone's heating load.

Mike


zhaicq98 wrote:
> In this example file, there is a cooling and a heating supply air 
> temperature set point managers. First, I do not really understand how 
> these two set point managers work. How does the program determine 
> which one to take effect during the simulation? Second, why is the 
> heating supply air temperature 10oC, but the cooling supply air 
> temperature 14oC?
>
> ! NOTE:  Heating supply air setpoint is placed on Supply Path Inlet 
> node to allow separate heating and cooling setpoints.
> ! SET POINT MANAGER:MIXED AIR <system name> Heating Coil Air 
> Temp Manager adjusts this setpoint for fan heat and places it on the 
> Heating Coil Outlet
>  
>   SET POINT MANAGER:SCHEDULED,
>     VAV Sys 1 Heating Supply Air Temp Manager,  !- Name
>     TEMP,                    !- Control variable
>     COMPACT HVAC-ALWAYS 10.0,!- Schedule Name
>     VAV Sys 1 Supply Path Inlet;  !- Name of the set point Node or 
> Node List
>
>   SET POINT MANAGER:SCHEDULED,
>     VAV Sys 1 Cooling Supply Air Temp Manager,  !- Name
>     TEMP,                    !- Control variable
>     COMPACT HVAC-ALWAYS 14,  !- Schedule Name
>     VAV Sys 1 Supply Fan Outlet;  !- Name of the set point Node or 
> Node List
>
>
>
> 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.pdf under the Documentation link and press the "search" button.
>  
> Yahoo! Groups Links
>
>
>
>   




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