Re: [EnergyPlus_Support] heat flux

[Jeremiah Crossett <jcrossett@xxxxxxxxxxxxxxx>]

You can use:

Key Value Exterior Wall

Variable Name Surface Inside Face Temperature

Reporting Frequency Hourly

Schedule Name Measurement period

• For schedule value you will want to use the period of time your measurements are for.  It is important that Energy Plus can go through warm up before the calibration period where you expect it to align with the data, so you want to have your measured data start at a point in the simulation where after the model has warmed up. If by some chance your measured data starts on Jan 1st, than you will want to set a run period that provides a warmup before the measured data starts by setting the model to repeat the run. 
• The challenge(s) are that your sensor may not align with with the model time frequency. For this you may have to average your data. When averaging your data I have noticed that Energy Plus averages the total sum of the previous hour at the point of the hour mark, so 11:00 is the sum of 10:00 to 11:00.  Also you will want to have more than one sensor so that you can take an average of the two. 

There may also be some use in the finite difference model so that you can use some of the more advanced surface level output variables such as:

Key Value Exterior Wall

Variable Name Surface Average Face Conduction Heat Gain Rate

Reporting Frequency Hourly

Schedule Name

Key Value Exterior Wall

Variable Name Surface Average Face Conduction Heat Loss Rate

Reporting Frequency Hourly

Schedule Name

Jeremiah D. Crossett  | Senior Analyst  |  Phase Change Energy Solutions

120 E. Pritchard St.  | Asheboro, NC 27203  | Mobile 503-688-8951

www.phasechange.com 

  

On Mon, Jun 24, 2013 at 8:38 AM, arch.tecnica <arch.tecnica@xxxxxxxx> wrote:

 

I used a heat flux probe/sensor on a real wall and I'm wondering which output should I choose now on my model on energy plus to obtain the same physical characteristics to compare with.
Thank you in advance

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