[Bldg-sim] Parking lot lighting (UNCLASSIFIED)

[Nick Caton]

Hey John!

Take a few minutes to play around with the slider bars on this web-learning-thingy:  http://astro.unl.edu/classaction/animations/coordsmotion/daylighthoursexplorer.html

This taught me that (unintuitively!) the "yearly average" in hours per night is actually a constant - 12!  Some places near the poles get long periods with no daylight, but those same locations get equally long periods with no nighttime... it all kinda evens out =).

This should help simplify your approximation approach - sorry I can't offer any Trace-specific advice due to my inexperience with the software.  Hopefully there's some quick way of defining "photocell" controls, but if not and you need such annual variations worked into your model I suppose you could define a latitude-specific schedule for the load manually... I might personally sooner explore whether an eQuest model is time-feasible =).

NICK CATON, P.E.
SENIOR ENGINEER

Smith & Boucher Engineers
25501 west valley parkway, suite 200
olathe, ks 66061
direct 913.344.0036
fax 913.345.0617
www.smithboucher.com 

-----Original Message-----
From: bldg-sim-bounces at lists.onebuilding.org [mailto:bldg-sim-bounces at lists.onebuilding.org] On Behalf Of Eurek, John S NWO
Sent: Wednesday, February 22, 2012 4:47 PM
To: bldg-sim at lists.onebuilding.org
Subject: [Bldg-sim] Parking lot lighting (UNCLASSIFIED)

Classification: UNCLASSIFIED
Caveats: NONE

I am putting the parking lot lighting into the energy model using Trane Trace 700.

Sunrise and sunset change every day.  What is the best/easiest way to model the parking lot lighting.  

I know the weather file has the sunrise/sunset information, but I'm not sure if there is a way to tie this to the parking lot lighting.

As of now, I plan to figure out the length of 'night time' during the equinox at my location and assume that it is the same every day.  This should give a very close approximation.



Classification: UNCLASSIFIED
Caveats: NONE


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