[Bldg-sim] TRNSYS: LIGHTING

[David BRADLEY]

Francesco and Fred,
   Fred is correct that TRNSYS does not have any built in daylighting 
computation and that importing available daylight schedules from 
Radiance or Daysim would be the best approach. I have used some other 
simplified approaches in TRNSYS but neither was for a LEED model.

   Having managed to navigate the LEED process with about 15 TRNSYS 
models over the years, I would contend that the nature of the building 
and its systems should drive the decision as to whether to use TRNSYS 
for the modeling or whether to opt for another tool. We've worked on 
some projects that relied on more conventional energy efficiency 
measures and felt that TRNSYS was not the right tool to be using. We've 
also worked on LEED projects that had such a highly sophisticated 
proposed HVAC system that there was probably not another tool out there 
that could have been used. I'd be happy to talk more with you offline 
about it but my advice would be to try and let the project choose the 
simulation software.

Best,
  David


On 5/1/2012 09:27, Fred Betz wrote:
>
> 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 <mailto:fbetz at aeieng.com>  | *www.aeieng.com 
> <http://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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-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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