Re: [EnergyPlus_Support] define schedule compact for infiltration to reach convergence results

On Wed, Mar 14, 2012 at 3:28 AM, Mohammad Kheradmand <mohammadkheradmand@xxxxxxxxx> wrote:

Hello Dr. Li,
Thanks again for wide spread information,
In my case,we did experimental tests that in detail:
A test cell which created a wall inside it we put sensors in two parts(north and south ambient part of cell) for measuring temperate changes and i try to simulate it by E+(attached pictures). when i put infiltration such as .idf file i can obtain good results in simulation,but i am not sure that is correct or not ...because infiltration can be exist in real. could you please put comment for me? how can i evaluate my simulation.
regards

From: YuanLu Li <yli006@xxxxxxxxxxx>
To: EnergyPlus_Support <energyplus_support@xxxxxxxxxxxxxxx>
Sent: Tuesday, March 13, 2012 11:47 PM
Subject: RE: [EnergyPlus_Support] define schedule compact for infiltration to reach convergence results

There is no problem with your IDF, except that you do not have DesignDay sizing.

The air infiltration rates to the zones were very high, 0.5 to 3.5 ACH.

You can add the followings to display them.
============================

Output:Variable,*,Zone Mean Air Temperature,Timestep;

Output:Variable,*,Outdoor dry bulb,Timestep;

Output:Variable,*,Schedule Value,Timestep;

Output:Variable,*,Zone Infiltration Air Change Rate,Timestep;

==============================

Output:Table:TimeBins,
*, !- Key Value
Zone Mean Air Temperature, !- Variable Name
, !- Interval Start
, !- Interval Size
20, !- Interval Count
, !- Schedule Name
Temperature; !- Variable Type
============================
I do not know what this is for and was not simulated.
Dr. Li

To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: mohammadkheradmand@xxxxxxxxx
Date: Tue, 13 Mar 2012 10:31:59 -0700
Subject: [EnergyPlus_Support] define schedule compact for infiltration to reach convergence results

Hello,
Could you please explain to me this point in
schedule compact:

Field: Value
Finally, the value field is the schedule value for the specified time interval.

what is meaningful of it? and is it true that i did in .idf file till now?

regards,

From: saleh saadi <salehsnjsaadi404@xxxxxxxxx>
To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Thursday, March 8, 2012 7:33 PM
Subject: Re: [EnergyPlus_Support] what can i do for convergence the result ?

Does the simulation underestimate or overestimate your experimental results?

You might need to consider the infiltration in your model. try to use simple convective heat transfer coefficient algorithm.

Use real weather data measured at site.

what is the uncertainty in your measurements equipment. ? your results need to be within 1 deg difference. (3-4) degree difference is large.

regards,

From: Mohammad Kheradmand <mohammadkheradmand@xxxxxxxxx>
To: "EnergyPlus_Support@xxxxxxxxxxxxxxx" <EnergyPlus_Support@xxxxxxxxxxxxxxx>
Sent: Thursday, March 8, 2012 11:06 AM
Subject: [EnergyPlus_Support] what can i do for convergence the result ?

I simulate my model for coldest and hottest a day of August, for comparing results between experimental and simulation results, i got reasonable result for hottest day(almost 4-5 degree differences ), but for coldest day i have difference almost 10-12 degree ...what is my problem?

regards

Jeremiah D. Crossett

CleanTech Analytics

503-688-8951

www.cleantechanalytics.com

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