[BLDG-SIM] strange behavior in simulating the solar radiation
Steven.Moller at csiro.au
Steven.Moller at csiro.au
Mon Apr 18 17:52:44 PDT 2005
Danni,
Do you see the spikes before resolving the solar beam onto the wall? If
so, you may need to test the solar altitude angle is greater than 1 or 2
degrees above the horizon AND/OR test for sunrise/sunset times.
If the unresolved data looks OK, check for angle of incidence onto the
wall. I haven't checked the location, but you must be very close to
glancing incidence at these times.
HTH
Steve.
<><><><><><><><><><><><><><><><><><><><><><><>
Mr. Steven Moller
Building Thermal Analyst
CSIRO Manufacturing & Infrastructure Technology
PO Box 56, Highett. Vic. 3190, Australia
(Street address: Graham Rd, Highett, Vic. 3190)
Phone: +61 3 9252 6000 (Switchboard) 9252 6337 (Direct)
Fax: +61 3 9252 6586
Email: Steven.Moller at csiro.au
Web : http://www.cmit.csiro.au
<><><><><><><><><><><><><><><><><><><><><><><>
> -----Original Message-----
> From: postman at gard.com [mailto:postman at gard.com] On Behalf
> Of Danni Wang
> Sent: Tuesday, 19 April 2005 10:13 AM
> To: BLDG-SIM at GARD.COM
> Subject: [BLDG-SIM] strange behavior in simulating the solar
> radiation
>
>
> I used the formula from ASHRAE Fundamentals 2001,
> Chapter 30 Fenestration, Section Determining Incident
> Solar Flux, Equation 10~24, to simulate the direct,
> diffuse, and reflect solar radiation on a south wall
> in Sacramento in June.
>
> The result seems close to, or at an acceptable scale
> of, the measured solar data (as recorded in nrel.gov
> website) for 5~19:00 hr of a day. But there are sharp
> spikes before 4:00 and after 20:00. The maximal value
> of the spikes for direct radiation gets to 5000w/m2,
> for diffuse radiation gets to 1200w/m2. This is
> unexpected to me. I tried someone else's code and
> result was very similar. May there be an explanation
> for this?
>
>
> Thank you very much.
>
> -- Danni
>
>
>
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