Controller for electrochromic windows.
If the temperature or the irradiation is below TClear or HClear, then
the window is in the clear state, allowing for passive heating and for view if the room is cool enough.
If the temperature and the irradition is above TDark and HDark, then
the window is in the dark state, thereby protecting the room from too much solar gain.
For each of these measured quantity, the respective control signal is a linear function, with
output limitation between 0 and 1.
The control output of this block is the product of these two control signals. Hence, there is
a continuous transition for intermediate values.
Temperature to ThermodynamicTemperature
to avoid an error in the pedantic model check in Dymola 2017 FD01 beta2.