[EnergyPlus_Support] Re: Modeling DHW Use

["luke_dorna" <luke.dorna@xxxxxxxxx>]

You're basically right on. 

Technically, what you would do would be to determine total flow rate of the fixtures in the room. Then, enter that into the peak flow rate of line of the wateruse:equipment element. 

Then create a schedule for the line item "flow rate fraction schedule name"

See below. 

  WaterUse:Equipment,
    DHW Cafeteria,           !- Name
    DHW Cafeteria,           !- End-Use Subcategory
    0.0007,                  !- Peak Flow Rate {m3/s}
    Cafeteria DHW,           !- Flow Rate Fraction Schedule Name
    DHW Supply Temperature,  !- Target Temperature Schedule Name
    DHW Supply Temperature,  !- Hot Water Supply Temperature Schedule Name
    DHW Mains Temperature,   !- Cold Water Supply Temperature Schedule Name
    F1:Cafe;                 !- Zone Name

  Schedule:Compact,
    Cafeteria DHW,           !- Name
    Any Number,              !- Schedule Type Limits Name
    Through: 12/31,          !- Field 1
    For: Alldays,            !- Field 2
    Until: 10:00,0,          !- Field 3
    Until: 11:00,0.2,        !- Field 5
    Until: 14:00,0.88,       !- Field 7
    Until: 15:00,0,          !- Field 9
    Until: 18:00,0.2,        !- Field 11
    Until: 24:00,0;          !- Field 13

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Ke Xu" <xukevin24@...> wrote:
>
> Dear all,
> I added a DHW loop in E+ model, so I have 2 water heaters and several outlets as "wateruse:equipment". I wasn't sure what to enter for the "Peak flow rate" for each outlet, is it related with the "Use side Design Flow Rate" as an input of class "waterheater:mixed"?
> 
> I would expect that modeling the demand side of DHW loop is kinda of similar with modeling lighting system, you would input a demand density number, such as Gal/ft2-day, then by multiplying the zone area, we get the peak flow rate, etc, and by multiplying a schedule, we get amount of DHW demand for each hour, right? 
> 
> Thanks in advance.
> 
> ---Ke
>



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