Re: [EnergyPlus_Support] Re: Hot Water Reset Savings?

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

No.  Higher chilled water supply temperatures should reduce chiller power 
consumption for the same load.  This assumes that the chiller EIR as a function 
of temperature curve is valid.  One would also expect the load to fall because 
the latent cooling at the coils should fall with higher water temperatures.

Mike


On 5 Jun 2007 at 22:26, noelcrrl wrote:

> Hi Mike...thanks for the response...
> 
> I am having the same issue with chilled water reset...is this to be 
> expected?
> 
> Noel
> 
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
> <mjwitte@...> wrote:
> >
> > 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@...
> >
> 
> 
> 
> 
> 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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