I'm a student at the university of Antwerp and I'm writing a thesis on green walls.
Currently, there is no green wall in Energyplus so what I intend to do to simulate green walls is the following. - I use the class SurfaceProperty:ExteriorNaturalVentedCavity to add a baffle to an exterior wall - I use the class SurfaceProperty:HeatBalanceSourceTerm to add heat fluxes to said baffle - I use EMS to actuate a schedule which my program overwrites each timestip with a program I write
The program itself is used to calculate the shortwave and longwave radiation, convective and latent heat fluxes (in a green wall).
I always get an error saying "Inside surface heat balance did not converge" which I can't seem to fix, I already looked at other related questions similar like this one:
https://unmethours.com/question/30345/what-does-the-energyplus-warning-inside-surface-heat-balance-did-not-converge-mean/
https://unmethours.com/question/17156/eplus-unusual-warning/
but it doesn't fix it. the problems arise with the equation of the convective heat flux. When I calculate the term:
phi_conv_f = (2LAIrho_afCp/r_a)(Ta - Tc) this gives me the error.
LAI = Leaf Area Index
rho_af = air densit
Cp = specific heat of air at constant pressure
r_a = aerodynamic resistance
Ta = outdoor temperature
Tc = Baffle temperature
When I calulate the term: (2LAIrho_af*Cp/r_a) seperately it gives normal numbers and same goes for (Ta - Tc) BUT when I multiply the two terms it doesn't work which doesn't make sense to me.
Am I missing something here, can anybody help please?
