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Re: [TRNSYS-users] average ambient day temperature



Nick,
  Type55 would allow you to integrate only over a certain time period (your 8am to 4pm time frame) and reset daily. Alternatively, you can get a daily sum of a function that has a value of 1 when the sun is up and a value of 0 otherwise: sunUp = GT(Ih,0) (where Ih is an output of your weather processor). That will get you the number of daylight hours each day. You'll then need to print out your hourly temperatures and do the integration in Excel after the simulation.
Best,
 David


On 4/8/2011 16:50, Nicholas LaHam wrote:
Jeff

Is it possible to create running averages based on certain criteria? For instance, could I calculate the average of the temperature each day only when radiation is present (during daytime hours) so that the average does not reflect the cold nights?

The closest solution I have found to this is to use an 8 hour running average, so that you are getting 3 averages each day: Midnight to 8am, 8am to 4pm, and 4pm to Midnight. And then using Excel to average only the 8am to 4pm data and erase everything else. The problem with this is the radiation is still present after 8am or before 4pm at certain locations and depending on the time of season.

Thanks,
Nick

On Apr 8, 2011, at 12:44 PM, Jeff Thornton wrote:

You can also use the utility model that creates a running average - in your case a running 24 hour average.  This will keep you from getting step changes at midnight.

Jeff

Jeff Thornton
President - TESS, LLC

22 North Carroll Street - Suite 370
Madison WI 53703 USA

Phone: 608-274-2577
Fax: 608-278-1475
E-mail: thornton@tess-inc.com
Web: www.tess-inc.com



----- Original Message -----
From: "Adrien JEZEQUEL - ITF" <a.jezequel@itf.biz>
Sent: Thu, April 7, 2011 9:10
Subject: Re: [TRNSYS-users] average ambient day temperature

Lana,

I think you can also use Type55, from utility library.

Best regards

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Le 07/04/2011 14:56, Arno Dentel a écrit :

Lana,

you can use Type127 to calculate an running mean value.

 

Best regards,

Arno

 
 

Von: trnsys-users-bounces@cae.wisc.edu [mailto:trnsys-users-bounces@cae.wisc.edu] Im Auftrag von Lana Saracevic
Gesendet: Donnerstag, 7. April 2011 10:04
An: trnsys-users@cae.wisc.edu
Betreff: [TRNSYS-users] average ambient day temperature

 

Dear all,

is there a Type that can calculate the average ambient day temperature of each day in the year, and where can I find it? I would like to use that to control the inlet temperature of a concrete core activation system.

 
 

Freundliche Grüße / Best Regards

 

Lana Saracevic

 

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