[EnergyPlus_Support] Re: Question about sky temperature and Horizontal Infrared Radiation?

["yhleifei" <yhleifei@xxxxxxxxxxxx>]

I had some field data of some wuhan building energy consumption. I 
want use e+ to calculate wuhan building, to compare .
The first step is check the weather file .epw . CHN_Wuhan_CSWD.epw 
was created from the "China Standard Weather Data for Analyzing 
Building Thermal Conditions April 2005" (China Meteorological Bureau-
Climate Information Center-Climate Data Office and Tsinghua 
University-Department of Building Science and Technology). I had the 
data CD of "China Standard Weather Data for Analyzing Building 
Thermal Conditions April 2005" . Compareing .epw with the data CD, 
except the element "Horizontal Infrared Radiation Intensity from Sky 
{Wh/m2}" , other elements are equal. 
In the data CD , there is a element "sky temperature". I guess 
that  "Horizontal Infrared Radiation Intensity from Sky {Wh/m2}" data 
could be calculated from the "sky temperature" , according equation 
at InputOutputReference Page57 . (sky temperature=(Horizontal 
IR/sigma)**0.25-273.15 )
But the calculate result is not same with the CHN_Wuhan_CSWD.epw . 
For example,
in the data CD , The first line of wuhan ,the  "sky temperature" is 
259.21 K .  "Horizontal Infrared Radiation Intensity from Sky 
{Wh/m2}" calculated by the equation is 256.2 . but in 
CHN_Wuhan_CSWD.epw, the Horizontal IR is 323. 
How the data  "Horizontal Infrared Radiation Intensity from Sky 
{Wh/m2}" of CHN_Wuhan_CSWD.epw  be created ?
Thank you for help again.
Lei Fei

--- In EnergyPlus_Support@xxxxxxxxxxxxxxx, Linda Lawrie <linda@...> 
wrote:
>
> If you put in "missing" values (I think it is 9999 but check the 
> documentation in Auxiliary Programs), then the program will 
> recalculate the Horizontal IR from sky as well as the sky 
temperature.
> 
> What led you to put in those values for Hor IR from sky?
> 
> Linda
> 
> At 08:32 AM 5/14/2008, yhleifei wrote:
> >I had modifyed a .epw file (CHN_Wuhan_CSWD.epw) ,set the data
> >of "Horizontal Infrared Radiation Intensity from Sky {Wh/m2}" in
> >weather file as 0,10,100,200,300.
> >And i output the "sky temperature ". When i run a case 
(case600.idf),
> >the "Environment:Sky Temperature [C](Hourly)" is -1,-98,-101,-43,-
13.
> >What wrong ?
> 
> 
> [Non-text portions of this message have been removed]
>



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

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 not allowed -- please post any files to the appropriate folder in the Files area of the Support Web Site.

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:
    mailto:EnergyPlus_Support-digest@xxxxxxxxxxxxxxx 
    mailto: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/