[Bldg-sim] TRNSYS: LIGHTING

[Fred Betz]

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
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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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