[esp-r] Re: MZELWE Longwave Flux Messages

[Lukas Swan (Dal)]

Hi Holger,
I have seen this in simulations before as well. It means that the long wave
flux from the exterior building surfaces is greater than a typical expected
range. I added a bit of verbosity to the source code once and found that it
was always caused by my exterior surface temperature being too high. This
was caused by the choice of high exterior surface absorptivity and
emissivity values, low specific heat, and low thermal conductivity.

Take a good look at the materials you are using and how they are situated
into the construction. Adjust some of these values and the issue will likely
decrease.

Lukas Swan
Dalhousie Univ.
Canada

-----Original Message-----
From: esp-r-bounces at lists.strath.ac.uk
[mailto:esp-r-bounces at lists.strath.ac.uk] On Behalf Of Holger Bertling
Sent: October-14-08 1:34 PM
To: esp-r at lists.strath.ac.uk
Subject: [esp-r] MZELWE Longwave Flux Messages

Dear All,

during my simulations I get a lot of these messages:

Wall-6:Raum_3 @ increment 31883
 This is considered high and a correlation will be used.
 <sky =  -222.7 <buildings = -145.3 <ground = -197.0
 MZELWE: a longwave flux of   -578.9 Watts has been calculated for
Wall-6:Raum_1 @ increment 31884
 This is considered high and a correlation will be used.
 <sky =  -228.3 <buildings = -147.9 <ground = -202.8
 MZELWE: a longwave flux of   -496.6 Watts has been calculated for
Wall-6:Raum_3 @ increment 31884
 This is considered high and a correlation will be used.
 <sky =  -197.3 <buildings = -126.0 <ground = -173.3
  50 %   complete; expected finish time : Tue Oct 14 18:14:36 2008
 MZELWE: a longwave flux of   -538.3 Watts has been calculated for
Wall-6:Raum_1 @ increment 79966
 This is considered high and a correlation will be used.
 <sky =  -213.7 <buildings = -136.3 <ground = -188.3
 MZELWE: a longwave flux of   -655.9 Watts has been calculated for

Does anybody know,
what that means
and if its bad or OK?

Thanks in advance,
Holger


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