[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[EnergyPlus_Support] Re: dynamic vs. steady state (E+ significantly under predicting energy demands)


I cannot answer, but utilization factor of heat gains has a great important in semi-steady state methods.
Try to read the following articles:
https://lirias.kuleuven.be/bitstream/123456789/204376/1/Whole+Building+IX+Comparison+of+steady-state+and+dynamic+building+energy+simulation+programs.pdf
http://www.sciencedirect.com/science/article/pii/S0378778806001861
With Regards

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, "Joe" <joebater@...> wrote:
>
> does anyone have any idea why discrepancies between E+ and simple steady state calculations, e.g. Q = U.A.dT, are so severe?  despite it being a dynamic modelling approach you'd think that in the long term (e.g. a year) the two methods would have a reasonable harmony, instead I'm often finding 25-40% under-prediction in E+ compared to steady state for some simple buildings...
> is there a recommended report for building fabric heat losses?
> best regards and thanks in advance for any advice
> j.
>



------------------------------------

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

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

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.
Yahoo! Groups Links

<*> To visit your group on the web, go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/

<*> Your email settings:
    Individual Email | Traditional

<*> To change settings online go to:
    http://groups.yahoo.com/group/EnergyPlus_Support/join
    (Yahoo! ID required)

<*> To change settings via email:
    EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    EnergyPlus_Support-fullfeatured@xxxxxxxxxxxxxxx

<*> To unsubscribe from this group, send an email to:
    EnergyPlus_Support-unsubscribe@xxxxxxxxxxxxxxx

<*> Your use of Yahoo! Groups is subject to:
    http://docs.yahoo.com/info/terms/