Issue 42 in cfast: Target temperatures fall below ambient
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Owner: cfastdev
Labels: Type-Defect Priority-Medium
New issue 42 by cfastdev: Target temperatures fall below ambient
http://code.google.com/p/cfast/issues/detail?id=42
What steps will reproduce the problem?
1. Attached test case has a target in a room without a fire locate on a
wall surface.
What is the expected output? What do you see instead?
Observed target temperature goes down below ambient temeprature before
recovering. It should never be possible for a target temperature to be
below the ambient temperature
Attachments:
Target.in 1.0 KB
mainfire.o 1.2 KB
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Status: Fixed
Comment #1 on issue 42 by cfastdev: Target temperatures fall below ambient
http://code.google.com/p/cfast/issues/detail?id=42
When target is located on a wall, back side gas radiation is not included
so in
effect, the back side is exposed to absolute zero, hence the cooling. Fix
is to add
a sigma x t_ambient^4 to backside gas radiation if target is located on a
wall.
Fixed in revision 168.