RE: [EnergyPlus_Support] DX Fan coil - Temperature (high) out of bounds

Why don't you post your IDF.

I am sure you aare one of those who only use annual simmulation, before making sure that the IDF is in working condition.

If your problem is on day one of annual simulaation, it is a Sunday. Do you have infiltration on Sunday?

Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: isac_moh@xxxxxxxxx
Date: Thu, 16 Aug 2012 13:20:31 -0700
Subject: Re: [EnergyPlus_Support] DX Fan coil - Temperature (high) out of bounds

Thanks for the info. I removed the loads and lighting, but still the temperature is high. It's an internal zone and is not exposed to the sun. What other suggestion you would have for it?

Thanks,

Eshagh

From: Richard Raustad <RRaustad@xxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Thursday, August 16, 2012 10:36 AM
Subject: Re: [EnergyPlus_Support] DX Fan coil - Temperature (high) out of bounds

Then you either have large zone radiant loads or direct or diffuse solar on the surfaces that cause these high temps.
Usually, bringing in infiltration will reduce the surface temps, something is causing them to be high.

Since this is happening during warmup, you can't see the data in the csv file (your Output:Variables).

Add:

Output:Diagnostics,ReportDuringWarmup;

This way you can see what's happening (in the csv file) and possibly diagnose the problem.

Add report variables from the rdd file (use Output:Dictionary,IDF; to see the rdd)

On 8/16/2012 10:28 AM, Eshagh wrote:

I increased the infiltration as much as I can but still I have the same problem?
From: Richard Raustad <RRaustad@xxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Wednesday, August 15, 2012 3:43 PM
Subject: Re: [EnergyPlus_Support] DX Fan coil - Temperature (high) out of bounds
Increase the infiltration until it runs.

On 8/15/2012 3:41 PM, Eshagh wrote:
Thanks for the information. I added infiltration and it gives similar erro but this time another wall surface has high band temperature!

** Severe ** Temperature (high) out of bounds (207.10] for zone="02-05IT", for surface="6F9A75"

** ~~~ ** During Warmup, Environment=RUN, at Simulation time=01/01 13:45 - 14:00

** ~~~ ** Zone="02-05IT", Diagnostic Details:

** ~~~ ** ...Internal Heat Gain [0.000] W/m2

** ~~~ ** ...Infiltration/Ventilation [1.001E-002] m3/s

** ~~~ ** ...Mixing/Cross Mixing [0.000] m3/s

** ~~~ ** ...Zone is part of HVAC controlled system.

** Fatal ** CalcHeatBalanceInsideSurf: Program terminates due to preceding conditions.

What else would you suggest to?

Thanks,

Eshagh
From: Richard Raustad <RRaustad@xxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Wednesday, August 15, 2012 3:25 PM
Subject: Re: [EnergyPlus_Support] DX Fan coil - Temperature (high) out of bounds
Add infiltration to get it to run and then look into why the gains are high.

On 8/15/2012 3:21 PM, Eshagh wrote:

Hi,

I model a building that has a IT room with just DX coil in it with no fresh air. I used a single speed DX coil with coil heating gas and AirloopHVAC:Unitary:Furnace component. When I run the model, I have one sever error as follows:

** Severe ** Temperature (high) out of bounds (202.62] for zone="02-05IT", for surface="383F89"

** ~~~ ** During Warmup, Environment=RUN, at Simulation time=01/01 11:30 - 11:45

** ~~~ ** Zone="02-05IT", Diagnostic Details:

** ~~~ ** ...Internal Heat Gain [0.000] W/m2

** ~~~ ** ...Infiltration/Ventilation [0.000] m3/s

** ~~~ ** ...Mixing/Cross Mixing [0.000] m3/s

** ~~~ ** ...Zone is part of HVAC controlled system.

I checked the surface and it's a surface adjacent to the corridor. The corridor is not conditioned, however, I do not know why the temperature on this particular surface is so high that it stops my simulation.

Can you please let me know about any tips/tricks that I overcome this problem?

Thanks,

Eshagh
-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 40 Years
-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 40 Years

-- 
Richard A. Raustad
Senior Research Engineer
Florida Solar Energy Center
University of Central Florida
1679 Clearlake Road
Cocoa, FL  32922-5703
Phone:   (321) 638-1454
Fax:     (321) 638-1439 or 1010
Visit our web site at: http://www.fsec.ucf.edu

UCF - From Promise to Prominence: Celebrating 40 Years

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