[Equest-users] change roof construction to glass

[David S Eldridge]

Any portions of the roof that are transmitting light and solar energy will have to be defined as windows in eQuest (or most other programs).  I'm assuming when you say glass roof that you are considering basically a full-size skylight, with irregular shape?

Defining a roof surface with the properties of glass will still result in an opaque surface, although the thermal resistance and mass would be as-specified, and transmission of solar radiation would be neglected.  This won't work if you have any spaces below with daylighting controls, let alone the heat transfer from light transmission.

Suggest that you give it your best shot with child windows, depending on your daylighting needs.  Add the majority of the area, take stock of results, add a few more windows with finer detail, check results, and repeat.  Eventually adding the finer detail isn't going to provide meaningful changes to the outputs.  (As a previous poster mentioned be sure the interaction with any daylighting controls is accounted for.)

David


David S. Eldridge, Jr., P.E., LEED AP BD+C, BEMP, HBDP
Project Manager

Direct: (847) 316-9224 | Fax: (847) 328-4550
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From: equest-users-bounces at lists.onebuilding.org [mailto:equest-users-bounces at lists.onebuilding.org] On Behalf Of Lauren Rosenthal
Sent: Thursday, May 06, 2010 11:16 AM
To: equest-users at lists.onebuilding.org
Subject: [Equest-users] change roof construction to glass

All,

Does anyone know how to change an existing roof in detailed mode of the model to a glass roof? It is an irregular shape (from a polygon) and therefore creating child windows all over it will be very hard because they will not fit in the shape very easily as rectangular windows. Can I change its properties in the .inp file?

Thanks in advance,

____________________________________
Lauren Rosenthal
Mechanical Engineer

Los Angeles CA


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