[EnergyPlus_Support] Re: Does U-value change with temperature?

["Amrita Ghosh amritaghosh1986@xxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Thank you everyone. So it seems the rated U-Value does not help much as the actual U-value changes every time with the ambient condition. 

On Thursday, 12 January 2017 12:12 PM, Amrita Ghosh <amritaghosh1986@xxxxxxxxx> wrote:

Hi,

Can anyone tell me if U-value of a material changes with temperature? 

While evaluating the U-value, if the convective heat transfer coefficients (h) change, the U-value changes. But does it also change when the temperature, indoor or outdoor, changes? Since the equation states: U=Q/(A. deltaT)

where deltaT= temperature difference between indoor and outdoor.

Thank you,

Amrita

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Posted by: Amrita Ghosh <amritaghosh1986@xxxxxxxxx>

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