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Re: [EnergyPlus_Support] Re: saving energy with change setpoint thermostat

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: saving energy with change setpoint thermostat
From: "Michael J. Witte" <mjwitte@xxxxxxxx>
Date: Thu, 11 Sep 2003 11:42:41 -0500
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My apologies for the delayed response.  It is certainly possible to 
see a 10% change in cooling load per 1C change in setpoint.  Cooling 
season indoor/outdoor temperature differences are often less than 
10C, but the envelope conduction is only a small component of the 
cooling load which also includes solar gains and internal loads.  
Cooling loads are calulcated using a heat balance method with uses 
conduction transfer functions to determine the transient heat flow in 
the buuilding surfaces.  For more details, see the Engineering 
Reference in the documentation folder.

On 8 Sep 2003, at 15:17, Tata Yohana wrote:

> Thank you Mr. Mike,
> I have repair my model and running simulation.
> But I get a dramatic result in energy savings.
> Total electricity facility is reduced 10 % for every 1 ^C difference
> in thermostat setting. I don't know it's possible or not ? Can you
> tell me calculation method for cooling load in EnergyPlus v1.1 ? 
> 
> Tata
> 
> --- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Michael J. Witte" 
> <mjwitte@g...> wrote:
> > The warnings show that your simulation is not converging and so it 
> is 
> > not producing valid results.  There are many examples in the 
> > EnergyPlus\ExampleFiles folder of system with chilers:
> > 
> > 5ZoneWaterCooled.idf and VAVSingleDuctReheat.idf - variable volume
> > single duct system
> > 
> > DDAutoSize.idf - constant volume dual duct system
> > 
> > Mike
> > 
> > 
> > On 4 Sep 2003, at 16:49, Tata Yohana wrote:
> > 
> > > Dear All,
> > > 
> > > I am using EnergyPlus for calculate energy consumption of the
> > > building. My model just for cooling load operation, and the 
> building
> > > using chiller for cooling loop. In setpoint thermostat using 
> single
> > > cooling setpoint with control type 2. I have running the 
> simulation
> > > for setpoint thermostat 22 C during occupied hours (from hour 5-
> 18)  
> > > and 27 C otherwise, and I have get total electricity facility 
> (J). But
> > > when I reduce cooling setpoint from 22 C to 24 C during occupied
> > > hours, total electricity facility not change. I can't get saving
> > > energy from reduce setpoint thermostat.
> > > 
> > > After running simulation, I get this warning :
> > > ---------------------------------------------------------------
> > >   ************* Testing Individual Branch Integrity
> > >    ************* All Branches passed integrity testing
> > >    ************* Testing Individual Supply Air Path Integrity
> > >    ************* All Supply Air Paths passed integrity testing
> > >    ************* Testing Individual Return Air Path Integrity
> > >    ************* All Return Air Paths passed integrity testing **
> > >    Warning ** tp12c0:  not converged in 8 CoolCoilErrs ** Warning
> > >    ** tp12c0:  not converged in 8 CoolCoilErrs ** Warning **
> > >    tp12c0:  not converged in 8 CoolCoilErrs ** Warning ** tp12c0: 
> > >    not converged in 8 CoolCoilErrs ** Warning ** tp12c0:  not
> > >    converged in 8 CoolCoilErrs ** Warning ** SimHVAC: Maximum
> > >    iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 04:15 - 04:30
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 04:30 - 04:45
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 04:45 - 05:00
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 05:00 - 05:15
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 05:15 - 05:30
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 05:30 - 05:45
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 05:45 - 06:00
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 06:00 - 06:15
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 06:15 - 06:30
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 06:30 - 06:45
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 06:45 - 07:00
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 07:00 - 07:15
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 07:15 - 07:30
> > >    ** Warning ** SimHVAC: Maximum iterations exceeded for all HVAC
> > > loops, SRJY, 07/21 07:15 - 07:17
> > >    ** Warning ** SimHVAC: Exceeding max iterations continues...50
> > > 
> > > ----------------------------------------------------------------- 
> Can
> > > any one help me for this problem? And can I get some example for
> > > simulation like this?
> > > 
> > > I do hope for a reply in the future. Thank you very much for your
> > > concern 
> > > 
> > > Tata
> > > 
> > > 
> > > 
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> > 
> > 
> > ========================================================
> > Michael J. Witte, GARD Analytics, Inc.
> > EnergyPlus Testing and Support      
> > EnergyPlus-Support@g...
> 
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========================================================
Michael J. Witte, GARD Analytics, Inc.
EnergyPlus Testing and Support      
EnergyPlus-Support@xxxxxxxx


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References:
- Re: [EnergyPlus_Support] saving energy with change setpoint thermostat
  - From: Michael J. Witte
- [EnergyPlus_Support] Re: saving energy with change setpoint thermostat
  - From: Tata Yohana

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