PV*SOL Expert 6.0 - Manual - Valentin Software

4.4.2 Dynamic temperature model
Solution for the thermal balance equation
In order to take into account the thermal inertia, each simulation time step (1 hour) must
be divided into multiple small time steps dt, in which the following differential equation is
solved using the dTModule. In order to find the solution even under extreme conditions (e.g. a
jump in the radiation from 0 to 1000 W / m²), dt is set for each calculation set and may be
as small as a few minutes.
With
The following sizes are may be used:
mModule : Module dimensions
AModule : Module area
CModule : Heat capacity of the module
TModule : Module temperature
QG : Absorbed power
QK : Convection
QS : Radiated thermal output
lchar : Characteristic overcurrent length
α : Absorption coefficient
ε : Emission coefficient
vw : Wind speed
Ta : Ambient temperature
Pel : Electric power output
t : Time
σ : Stefan-Boltzmann constant
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