Hello, Lee
I suggest this trick.
Before Warm-up, call ProgramCallingmanager
EnergyManagementSystem:ProgramCallingManager,
myCalc3, !- Name
BeginNewEnvironment, !- EnergyPlus Model Calling Point
calc_warmup; !- Program Name 1
Set “flag=1” at the end of warm-up
EnergyManagementSystem:Program,
calc_warmup, !- Name
set flag=1; !- Program Line 1
After warmup call ProgramCallingmanager
EnergyManagementSystem:ProgramCallingManager,
myCalc4, !- Name
AfterNewEnvironmentWarmUpIsComplete, !- EnergyPlus Model Calling Point
calc_after_warmup; !- Program Name 1
Set “flag=0” at the beginning of warm-up
EnergyManagementSystem:Program,
calc_after_warmup, !- Name
set flag=0; !- Program Line 1
Finally, using flag mark and EMS if logic,
you can control the zone temperature for warm-up period and for run-period separately (see below example)
this example shows that a room temperature is fixed at 22 during warm-up but changed according to the control logic during run-period
EnergyManagementSystem:Program,
calc_bulb_controller, !- Name
if flag ==0, !- Program Line 1
if hour>=0 && hour <1, !- Program Line 2
if Minute >= 10 && Minute <= 50, !- A4
set my_switch=1, !- A5
set my_setpoint=50, !- A6
else, !- A7
set my_switch=0, !- A8
endif, !- A9
else, !- A10
set my_switch=0, !- A11
endif, !- A12
else, !- A13
set my_switch=1, !- A14
set my_setpoint=22, !- A15
endif; !- A16
I hope this help.
Best Regards,
Deuk-Woo, Kim
----------------------------------------------------------------------------------------
Ph.D. Student
Department of Architectural Engineering, College of Engineering, SungKyunKwan University,
Suwon, 440-746, South Korea
* Tel: +82-31-299-4774
* E-mail: deukwookim@xxxxxxxx
* Homepage: http://bs.skku.ac.kr/
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Linda Lawrie
Sent: Tuesday, January 18, 2011 1:55 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: Re: [EnergyPlus_Support] Re: starting zone temperature
No, and it wouldn't work because EnergyPlus wants to iterate on the load/temperature balance until it reaches a steady state of the heat balance of surfaces.
Is this an uncontrolled zone? If so, it will be more difficult to match temperatures, but you can run a day and see what comes out -- then fine tune the parameters in the Building object to reach a finer resolution.
Likewise, if it is a controlled zone, you may need to fine tune those to make sure it reaches setpoint temperatures.
You may need to add infiltration amounts or carefully select internal heat gains to help you.
At 09:50 AM 1/17/2011, cleef_lee wrote:
Thanks for the reply.
In fact, what I am trying to do is to compare some simulation data with some real data,temperature wise and I want to ensure that the starting point for the simulation temperature matches the one in the real data.
So I was hoping to be able to define the initial temperature of my zone. Is that possible?
Thanks
Lee
--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "James V Dirkes II, PE" <jim@...> wrote:
>
> Dear Lee,
>
>
>
> I��m not quite sure what you mean�
>
&g>>
>
> If you presume that your building is starting from a non-controlled temperature and that you must define it, don�t worry. E+ goes through a warmup process to stabilizee energy transfer and then begins the annual simulation.
>
>
>
> Once the simulation begins, it keeps track of energy loss and gain for periods when the HVAC may be turned off so that the inside temperature is correct as HVAC starts again to bring the space to the desired setpoint.
>
>
>
> I hope that helps�.
>
>
>
>
&>
>
>
> The Building Performance Team
> James V. Dirkes II, P.E., LEED AP
> 1631 Acacia Drive NW
> Grand Rapids, MI 49504
> 616 450 8653
>
>
>
> From: EnergyPlus_Support@xxxxxxxxxxxxxxx [ mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of Lee Cleef
> Sent: Monday, January 17, 2011 7:56 AM
> To: EnergyPlus_Support@xxxxxxxxxxxxxxx
> Subject: [EnergyPlus_Support] starting zone temperature
>
>
>
>
>
> Hi,
>
>
>
> Could anyone help me understand how I could define the starting temperature of a zone?
>
>
>
> Thank you very much!!
>
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