CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > FLUENT

Solar Heat Flux

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Display Modes
Old   March 31, 2004, 15:49
Default Solar Heat Flux
  #1
JoHn@
Guest
 
Posts: n/a
Hello all; How can i model the solar heat flux falling on a wall?I've tried to use heat flux boundary condition with a value say 100w/m2, however, results are totally unphysical, i got temperatures in the range of 600 to 700k. Is it the heat flux that i should modify?suggestions please. Thanks.
  Reply With Quote

Old   March 31, 2004, 21:58
Default Re: Solar Heat Flux
  #2
co2
Guest
 
Posts: n/a
you will need to refer to a basic solar engineering book. modeling solar heat flux is not trivial. 100 W/m2 is not a bad guess for about 2 PM time period. But again this varies from place to place, time of year, cloud cover so on and so forth .. let me know what exactly you are looking to do with solar heat flux
  Reply With Quote

Old   April 1, 2004, 08:02
Default Re: Solar Heat Flux
  #3
JoHn
Guest
 
Posts: n/a
Okey. I have no problem with getting the values of the solar heat flux.The problem is the boundary condition i should use with my problem.I have a 25cm thick concrete wall.The use of a heat flux is giving me crazy temperature values, in the range of 600K inside the wall! This is surely unphysical...its like i am having an isolated system where i keep adding heat to it and the temperature rises infinitely...What BC should i use? Thanks.
  Reply With Quote

Old   April 1, 2004, 10:53
Default Re: Solar Heat Flux
  #4
co2
Guest
 
Posts: n/a
you will need to write a UDF to release equivalent amount of heat in your wall.

heatflux (W/m2) * area of cell exposed / cell volume.

that will give u good results
  Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Sign of Heat Flux at wall Kyung FLUENT 2 February 26, 2016 17:25
Variable name for heat flux peterle CFX 4 February 13, 2014 03:21
Heat Flux at wall in a conjugate heat transfer problem Chander CFX 2 July 9, 2011 22:22
Heat Flux Wall Boundary Confusion. Joee FLUENT 1 August 21, 2010 12:20
solar heat flux through roof Tim FLUENT 1 January 17, 2007 17:01


All times are GMT -4. The time now is 09:58.