Re: [EnergyPlus_Support] saving energy with change setpoint thermostat

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

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@xxxxxxxx


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