[esp-r] Convection coefficients problem

[Michael Lucchi]

Hello ESP-r users,

I’m trying to model a ventilated façade characterized by a forced
convection regime using Esp-r (version 12.0 for Windows 7) for my thesis.
The model is composed by one single room, and the external facades are
ventilated opaque walls. The ventilated façade is composed by three thermal
zones, with the aim to obtain the vertical temperature distribution. In
order to reach reasonable results, I tried to impose the Fisher and
Pedersen correlation for mechanically driven flows both in the room and in
the ventilated façades. However, when I run the simulation, a numerical
error stops any module. The following text is the error displayed by the
simulator:

*mzsad 1: numerical error after 93 time-steps.*

*(Hour 10 on year day 189).*

*e(iconst,n)    = -17999998.000000*

*a1      = -18000000.0000*

I am still  a novice user of the software and any help is much appreciated.

Kind regards.

Michael Lucchi
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