[Equest-users] Input function with daylight factors for accurate daylighting

Kent Beason kbeason at estesmcclure.com
Wed Aug 14 17:45:16 PDT 2013


The method that Nathan describes is likely known by the IES users on your team, but I focused on the possibility that you would want to feed a schedule into eQuest as was the case in the article that I referenced. 

Would be interested in how your  issue progresses and what course is chosen of the many. 


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-------- Original message --------
From: Nathan Kegel <nathan.kegel at iesve.com> 
Date: 08/14/2013  4:42 PM  (GMT-06:00) 
To: Kent Beason <kbeason at estesmcclure.com>,"'Sami, Vikram'" <vikram.sami at zgf.com>,"'Bishop, Bill'" <bbishop at pathfinder-ea.com>,'David Griffin' <dgriffin at etcgrp.com>,"'Busman, Michael R'" <MBusman at chevron.com>,equest-users at lists.onebuilding.org 
Subject: RE: [Equest-users] Input function with daylight factors for	accurate daylighting 
Felt like a response was warranted to clarify how this works. 
There is no need to copy/paste from Vista or generate a separate schedule in IES VE.  IES have a GUI for Radiance which allows the user to place a sensor in a zone, create a control algorithm for that sensor (more accurately, create a means for how the sensor should either dim or “step” lights on/off), run an annual daylight simulation using Radiance (for which we have an algorithm that looks at various sky conditions throughout the year and relates them to the sky conditions in the climate file), then, by means of simply ticking a box, feed the results of that annual daylight simulation directly into the thermal simulation.
It is true that you can export the actual hourly illuminance levels from Vista – but (again) there is no need to do that in order to use the results in the thermal simulation within the VE.  In other words – it’s not very labor intensive to actually incorporate an annual Radiance simulation into the thermal simulation.
That’s the short version.  If anyone is interested in learning more (as I don’t wish to turn this into an IES thread), I’m sure you’ll let me know.  J

Nathan Kegel 
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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Kent Beason
Sent: Wednesday, August 14, 2013 4:20 PM
To: 'Sami, Vikram'; 'Bishop, Bill'; 'David Griffin'; 'Busman, Michael R'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Input function with daylight factors for accurate daylighting
The following article is a good read since it is related: http://www.nrel.gov/sustainable_nrel/pdfs/47522.pdf.  Some background info is given with regard to the shortfalls of DOE2 daylighting vs backward raytracing aka Radiance-based tools also, so I thought I'd post it for reference.  It also gives a good play-by-play in context of the NREL RSF case study, which incorporated the use of SPOT, an Excel-based tool which runs Radiance in the background. 
That said, IESVE currently would fit better in your process obviously since it's already being used in the project as you say.  Similarly, as is described for SPOT in the article, exporting a dimming schedule from IES is simple from its Vista module once the simulation is done, and then imported into eQuest.  Apparently lots of other schedules were created during the RSF design with software tools better suited for various analyses but the central energy model was crunched by eQuest I believe using those imported schedules.  SPOT may still be of use as it is supposed to find the optimal sensor placement, but any sensor placement will need to be consistent with actual lighting layout/circuits anyways.  Anyone familiar with SPOT might be able to contribute.
Kent Beason
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From: Sami, Vikram [mailto:vikram.sami at zgf.com] 
Sent: Tuesday, August 13, 2013 7:26 PM
To: Bishop, Bill; David Griffin; 'Busman, Michael R'; equest-users at lists.onebuilding.org
Subject: Re: [Equest-users] Input function with daylight factors for accurate daylighting
Couple of suggestions:
1.       Run the model in IES – I think they have a better daylight algorithm.
2.       Use Daysim  - you can get hourly light level readings from Daysim that you can postprocess to create a lighting schedule in eQUEST. This is probably fairly labor intensive.
Vikram Sam
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