[Bldg-sim] R: RE: TRNSYS: LIGHTING

[francesco.passerini at inwind.it]

Hello FredThank you for your message.Do you use the same geometrical model for TRNSYS and Radiance, e.g. a model created with Google SketchUp?Best RegardsFrancesco Passerini


----Messaggio originale----

Da: fbetz at aeieng.com

Data: 01/05/2012 16.27

A: "francesco.passerini at inwind.it"<francesco.passerini at inwind.it>, "bldg-sim at lists.onebuilding.org"<bldg-sim at lists.onebuilding.org>

Ogg: RE: [Bldg-sim] TRNSYS: LIGHTING




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Francesco,
 
I don’t believe TRNSYS can model daylighting, but I would email the TRNSYS list to be sure, trnsys-users at cae.wisc.edu.

 
What we do is model the daylighting using Radiance/Daysim, and then integrate those results into TRNSYS by adjusting the artificial lighting schedule.

 
In general it is difficult to model ASHRAE 90.1 system types in TRNSYS, but doable. Also, I would discourage you from modeling more than 20-30 zones as it gets
 cumbersome in TRNSYS. 
 
We typically use TRNSYS to design complex systems, and then adjust other software such as eQuest to match for compliance modeling. Sometimes an exceptional
 calculation is required when the changes are just too much for eQuest. 
 
Our experience is that model reviewers don’t understand TRNSYS as it doesn’t provide “canned” reports like TRACE or eQuest that are familiar to them.

 
Good luck.
 
Fred
 
 




Fred Betz 
PhD., LEED AP


Sustainable Systems Analyst


 


AEI |
 AFFILIATED ENGINEERS, INC.  

5802 Research Park Blvd. | Madison, WI  53719



P: 608.236.1175 | F: 608.238.2614  

fbetz at aeieng.com  | 
www.aeieng.com
  




 
 

From: francesco.passerini at inwind.it [mailto:francesco.passerini at inwind.it]


Sent: Monday, April 30, 2012 11:26 AM

To: bldg-sim at lists.onebuilding.org

Subject: [Bldg-sim] TRNSYS: LIGHTING

 
Hello. 

I attended a course about TRNSYS v.17 and probably my research group will buy it. Our idea is to use TRNSYS for simulations according to ASHRAE 90.1 annex G (LEED certification refers to
 that method).
Can TRNSYS v.17 calculate the internal illuminance? It would be useful to model lighting control systems, e.g. if the artificial lighting is switched off when solar lighting provides a
 determined level of internal illuminance (lux).
Best Regards

 








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