Closed GoogleCodeExporter closed 9 years ago
What's your initial height for the detector? Depending on the relative
position of the fire and detector, I can see this happening since the detector
is just doing a heat transfer calculation from all elements of the surroundings
to the detector. If the relative contribution to the heating of the detector
by fire radiation goes up, the detection time can be expected to decrease. If,
on the other hand, the detector is located in the ceiling jet initially and
then lowered out of the ceiling jet while not coming that much closer to the
fire, the detection time should increase since the convective contribution to
detector heating would go down.
I suspect this is an artifact of how CFAST does the heating calculation for
this test case. If you have an input file, we can examine it further.
Original comment by cfastdev@gmail.com
on 25 Jun 2014 at 7:27
What's your initial height for the detector? Depending on the relative
position of the fire and detector, I can see this happening since the detector
is just doing a heat transfer calculation from all elements of the surroundings
to the detector. If the relative contribution to the heating of the detector
by fire radiation goes up, the detection time can be expected to decrease. If,
on the other hand, the detector is located in the ceiling jet initially and
then lowered out of the ceiling jet while not coming that much closer to the
fire, the detection time should increase since the convective contribution to
detector heating would go down.
I suspect this is an artifact of how CFAST does the heating calculation for
this test case. If you have an input file, we can examine it further.
Original comment by cfastdev@gmail.com
on 25 Jun 2014 at 7:30
With no response for six months, we'll close this for now. You can post a new
issue if you have additional information.
Original comment by cfastdev@gmail.com
on 30 Dec 2014 at 3:21
Original issue reported on code.google.com by
fok.laur...@gmail.com
on 11 Jun 2014 at 1:27