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What is frame and divider conductance?

asked 2018-10-24 11:25:09 -0500

rgow985 gravatar image

updated 2019-01-07 12:14:44 -0500

Under window property frame and divider, openstudio asks for frame and divider conductance. Is this the same as a U-value? If it is not, how can a U-value be entered instead of a conductance?

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answered 2018-10-24 11:49:54 -0500

updated 2018-10-24 11:59:04 -0500

Yes, this is essentially the same as U-value. This is the conduction heat transfer per area of window frame or divider that is projected onto the same plane as the window itself. The heat transfer equation used by EnergyPlus is:

$Q_{cond} = k*A_f * (T_{frame, inside} - T_{frame, outside})$

Where $k$ is the frame conductance input you are asking about. This equation also applies to the window divider conductance input.

You can read more about window frame and divider heat transfer calculations used by EnergyPlus here, as well as refer to this other Unmet Hours post that has a good discussion about this topic.

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Asked: 2018-10-24 11:25:09 -0500

Seen: 115 times

Last updated: Oct 24 '18