Re: [EnergyPlus_Support] Hot Water Reset Savings?

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

No, BOILER:SIMPLE does nothing more than apply the nominal efficiency and a 
part-load curve.  It does not model any jacket losses, and so it's efficiency 
is not sensitive to the supply temperature.  Also, with no piping losses in the 
simulation, that effect is not present either.  So, I would expect the same 
boiler energy consumption for these two cases.

I can't think of an easy way to model this with current capabilities.

Mike


On 1 Jun 2007 at 2:44, noelcrrl wrote:

> Dear All-
> 
> I am tying to estimate the energy savings of implementing a hot water 
> reset as a function of outside air.  The object was entered as shown 
> at the end of this message.  When I implement the hot water reset, 
> the energy consumption of the boiler does not change-no energy 
> savings.  Why is this the case?  Does the boiler:simple object take 
> into account water delivery temperature into its energy consumption 
> calculation?
> 
> SET POINT MANAGER:OUTSIDE AIR,
>     Hot Water Loop HW Temp Manager,  !- Name
>     TEMP,                    !- Control variable
>     82.2,                    !- Set point at outside low {C}
>     -6.7,                    !- Outside low {C}
>     65.6,                    !- Set point at outside high {C}
>     10,                      !- Outside high {C}
>     Hot Water Loop HW Supply Outlet;  !- Name of the set point Node 
> 
> Note, I am using the boiler simple object.  Thanks in advance.
> 
> Noel
> 
> 
> 
> 
> 
> 
> 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
> 
> 
> 
> 
> 


========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx





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