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boundary condition of solar radiation
Posted Jun 26, 2012, 1:12 a.m. EDT Heat Transfer & Phase Change Version 4.2a 1 Reply
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hi...
I have some question about solar radiation model (external radiation source)
Applies to the wall of building, only one side of wall is applied the solar incident radiation.
I was modeling the wall as 2D (rectangle wall)
How should I set the boundary conditon of wall
1. only one side of wall ( solar incident radiation)
surface-surface radiation? or surface-ambient radiation?
2. others of wall
adiabatic? or surface-surface radiation? or surface-ambient radiation?
my geometry is in attached file
I have some question about solar radiation model (external radiation source)
Applies to the wall of building, only one side of wall is applied the solar incident radiation.
I was modeling the wall as 2D (rectangle wall)
How should I set the boundary conditon of wall
1. only one side of wall ( solar incident radiation)
surface-surface radiation? or surface-ambient radiation?
2. others of wall
adiabatic? or surface-surface radiation? or surface-ambient radiation?
my geometry is in attached file
Attachments:
1 Reply Last Post Jun 26, 2012, 2:32 a.m. EDT
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Posted:
1 decade ago
Hi
the best is to check each one, read the help and look at the equations:
Heat flux gives an incident boundary (surface) flux in W/m^2 with some options
Convective cooling corresponds to the removal of heat by air convection (not that much different from the previous, but it "bins-in" the internal variables convection part)
Surface to ambient is for radiative exchange to a large outside domain at a given temperature
Inflow heat flux mimics a virtual domain
For solar flux, if I read the new 4.3 doc correctly you must turn on the surface to surface or re radiating surface check box this will add new items in the right-click list (was probably the case in 4.2 too )
--
Good luck
Ivar
the best is to check each one, read the help and look at the equations:
Heat flux gives an incident boundary (surface) flux in W/m^2 with some options
Convective cooling corresponds to the removal of heat by air convection (not that much different from the previous, but it "bins-in" the internal variables convection part)
Surface to ambient is for radiative exchange to a large outside domain at a given temperature
Inflow heat flux mimics a virtual domain
For solar flux, if I read the new 4.3 doc correctly you must turn on the surface to surface or re radiating surface check box this will add new items in the right-click list (was probably the case in 4.2 too )
--
Good luck
Ivar