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Increased WWR = Decreased Peak Tonnage?

asked 2018-07-31 12:53:25 -0600

sgudeman

61 ●3 http://www.morrisseyen...

updated 2018-08-06 08:08:58 -0600

__AmirRoth__

4436 ●5 ●17 http://bleedinggreenna...

Generated the below Sefaira response curve for window-wall ratio versus peak cooling coil load (tons), in yellow and Annual electricity consumption (kWh) in red...

The linear increase in annual energy I get... But the weird cooling coil response curve, I’m having trouble wrapping my head around. Thoughts?

Weird Response Curve

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answered 2018-08-02 10:46:55 -0600

dradair
2478 ●7 ●20 http://google.com/

what kind of space use type & interior loads do you have in the model? If heavily interior loaded the heat can get trapped inside and the higher WWR ratio (with u-values which are worse than walls, typ) allows that heat to escape. Would/can also shift when the peak load is occurring since it could be a mix of interior/envelope loads too.

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Ooh, good point. This does have pretty significant internal loads modeled currently... 1.5 W/sf, for a total energy end use contribution on the order of 40%. I like this explanation!

sgudeman ( 2018-08-02 15:05:25 -0600 )edit

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Asked: 2018-07-31 12:53:25 -0600

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Last updated: Jul 31 '18

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Increased WWR = Decreased Peak Tonnage? edit