[esp-r] Re: MZELWE warnings

[Jon Hand]

ESP-r derives the sky temperature from current weather data (which is humidity sensitive) and
then uses this in the calculation of longwave radiant heat losses from surfaces in the model. Some
surfaces (especially those that are lightweight e.g. metal over insulation) at particular orientations 
can produce these warnings. It is thus a combination of: where the surface is located, what it is made 
of and the current ambient temperature and humidity.

If I saw it a dozen times over a season I would not worry.  Sometimes it helps to use shorter simulation
timesteps.  Sometimes increasing the outer layer thickness 1mm also helps.

-Jon Hand
________________________________________
From: esp-r-bounces at lists.strath.ac.uk [esp-r-bounces at lists.strath.ac.uk] on behalf of Gül Nihal Güğül [gulgugul at yahoo.com.tr]
Sent: 11 June 2014 10:18
To: esp-r at lists.strath.ac.uk
Subject: [esp-r]  pv simulation

Dear all;

I have two questions about pv.
I am working on the cellular pv example of esp-r. I added a zone to this model and changed the location of pv panel from manager_a to my zone.

When I simulate this model, its wririntg as follows many times for different zones;

"MZELWE: a longwave flux of -1276.9 W/m2 has been calculated for roof:roof( components: sky= -1230.2 (T=263), buildings=-13.8(T=362.9), ground= A correlation long wave flux value of -657.2 W/m2 will be used instead"

What does it mean? Does it mean that there is something wrong about climate?

Also I need the hourly electricity produced by pv, in order to get this information, I make result analysis and I select "electrical results". When I select "grahps" I can see the 8760 value created for whole year. But when I select tabular report to ger these values this gived me only 500 values, I can not get the 8760 value.

If anyone can helpp I will be so happy. Thank you for your time.

Best wishes

Gul