[EnergyPlus_Support] Re: PTHP Cycling

["Jean marais" <jeannieboef@xxxxxxxxx>]

To add to Richards comments, the operating mode schedule changes the fan mode from Continuous to Cycling. A cycling fan cycles on and off to meet the loads.

Make sure the fan is scheduled always on and think about a setback temperature for your thermostat during unoccupied times.

Then use the control mode schedule to change the control mode (0=continuous, 1=cycling...I think) of the fan. You could possibly reference the same schedule here as your occupancy schedule because eplus accepts zeros as zeros and nonzero fractions as 1, when it expects a 0/1 input.

This approach is the alternative to the nightmanager.

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Richard Raustad <RRaustad@...> wrote:
>
> Use the fan operating mode schedule to change modes from day to night.
> 
>  From the PackagedTerminalHeatPump.idf example file.
> 
>    ZoneHVAC:PackagedTerminalHeatPump,
>      Zone1PTHP,               !- Name
>      SupplyFanSch;          !- Supply Air Fan Operating Mode Schedule Name
> 
>    Schedule:Compact,
>      SupplyFanSch,           !- Name
>      Fraction,                !- Schedule Type Limits Name
>      Through: 12/31,          !- Field 1
>      For: AllDays,            !- Field 2
>      Until: 7:00,1.0,        !- Field 3
>      Until: 17:00,0.0,        !- Field 3
>      Until: 24:00,1.0;        !- Field 3
> 
> 
> 
> On 7/21/2011 4:33 PM, riccianop6 wrote:
> >
> > Hi All,
> >
> > I need satisfy the section G3.1.2.4 of Ashrae Standard 90.1-2007.
> >
> > "Supply and return fans shall operate continuously whenever spaces are 
> > occupied and shall be cycled to meet heating and cooling loads during 
> > unoccupied hours".
> >
> > So, I'm using PTHP system in the building.
> >
> > How can I simulate it if I have no night cycle in this kind of HVAC?
> >
> > Thanks!
> >
> > 
> 
> -- 
> Richard A. Raustad
> Senior Research Engineer
> Florida Solar Energy Center
> University of Central Florida
> 1679 Clearlake Road
> Cocoa, FL  32922-5703
> Phone:   (321) 638-1454
> Fax:     (321) 638-1439 or 1010
> Visit our web site at: http://www.fsec.ucf.edu
> 
> UCF - From Promise to Prominence: Celebrating 40 Years
>




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