The thermal source may be modelled as a dynamic heat exchanger, which means that the properties of the cooled fluid change throughout time. Just like in the fixed heat exchanger modelling, these parameters are fixed:
Heat transfer coefficient, W/(K*m2)
Surface area, m2
Flow direction (parallel, countercurrent)
However the fluid inlet and outlet temperatures are dependent upon time. The same methods of time and temperature values in a table apply just as in previous cases Dynamic outlet temperature source. It is important to note that the temperatures in every time moment must meet this condition Tin>Tout, as the heat is taken away from the modelled fluid.
