[esp-r] Re: MZELWE

[Geissler Achim]

Dear Paul,
really? Wow. So in the simulation the approx. 500 W/m2 are truncated to something fairly arbitrary and probably in the range of 100 - 250 W/m2 (not-to-much wind and DT of 20 to 30 K)? The sky temperature is then discounted? Seems a bit out of line for ESP-r to substitute by something that discounts the physical process ... hmm.
We have also had that message off and on, so next time we will need to take a closer look, it seems ... I had assumed the program substitutes a reasonable estimate (comparable to the "solar exceeds extraterrestrial constant" thing).
Regards,
Achim


> -----Original Message-----
> From: esp-r-bounces at lists.strath.ac.uk [mailto:esp-r-
> bounces at lists.strath.ac.uk] On Behalf Of paul strachan
> Sent: Friday, November 23, 2007 12:17 PM
> To: esp-r at lists.strath.ac.uk
> Subject: [esp-r] Re: MZELWE
> 
> Dear Felipe,
> 
> It means the calculated external longwave flux exceeds a preset value at
> the indicated timestep during the simulation. At present this limit is
> set at 495W/m2 (the warning message units should read W/m2, not W). The
> correlation used in such circumstances is that the longwave flux is a
> function of windspeed and surface-to-air temperature difference:  ( 3.0
> +1.7 V) * (delta-T).
> 
> The warning message is commonly generated at times where there is a
> combination of unusually high external surface temperature, high surface
> emissivity and low calculated sky temperature.
> 
> Regards
> Paul
> 
> 
> > Dear all,
> >
> > I have ran a simulation and a message has been given: "MZELWE:
> > a longwave flux of   -503.3 Watts has been calculated for
> > Surf-5:zona_sur @ increment   227 This is considered high and a
> > correlation will be used."
> > What does it means?.  I am attaching the whole message.
> >
> > Thank you very much
> >
> > Felipe Duran
> 
> --
> ***************************************************************
> Dr P A Strachan                   email: paul at esru.strath.ac.uk
> ESRU, Dept. of Mechanical Eng.          phone: +44 141 548 2041
> University of Strathclyde                 fax: +44 141 552 5105
> Glasgow G1 1XJ, UK                 http://www.esru.strath.ac.uk
> ***************************************************************
> 
> 
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