heat balance of hollow sphere

[okimoin]

I am trying to make a program to calculate heat balance of a hollow black sphere which is under sun. So I have to add direct solar radiation, diffuse solar radiation, longwave sky radiation and longwave radiation from surrounding surfaces as radiation input on the sphere and radiation out would be heat removed by air flow and radiation hear loss of the sphere itself. I have understood other parameters except calculation of direct solar radiation and heat loss by air flow. If someone can explain me these two it would be a great help or refer me some books or programs. Thanks

 

[IRstuff]

Is there some reason this is separate from your other thread:
thread391-156309

TTFN

 

[ko99]

okimion,

Solar heating is tough to nail down -- solar intensity is very sensitive to a number of factors and of course it's also a transient problem due to the constantly changing angle of the sun's rays.

Standards have been developed by ASHRAE. You may also want to check out Bellcore Spec GR-487-CORE.

Also, here's an article summarizing how one product was simulated, designed and tested for solar heating:

http://www.flomerics.com/flotherm/technical_papers/t258.pdf

ko (

http://www.ecooling.biz)