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

["Jeremiah Crossett jcrossett@xxxxxxxxxx [EnergyPlus_Support]" <EnergyPlus_Support@xxxxxxxxxxxxxxx>]

Yes, temperature changes as a function of speicific heat, denisity, thickness and conductivity. The mass absorbs and releases heat as a sum of the thickness, denisity and speicific heat at a rate of time relative to conductivity.

On Wed, Jan 11, 2017 at 10:45 PM Amrita Ghosh amritaghosh1986@xxxxxxxxx [EnergyPlus_Support] <EnergyPlus_Support@xxxxxxxxxxxxxxx> 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

__._,_.___

---

Posted by: Jeremiah Crossett <jcrossett@xxxxxxxxxx>

---

EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx

The EnergyPlus web site is found at:
http://www.energyplus.net/

The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/

Attachments are currently allowed but be mindful that not everyone has a high speed connection.  Limit attachments to small files.

EnergyPlus Documentation is searchable.  Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.

Visit Your Group

• New Members 2

• Privacy • Unsubscribe • Terms of Use

__,_._,___