Hello,
I am trying to model a single room exposed to a constant outdoor condition. For indoor heating I use an electric baseboard heater (operative temperature controlled), which allows me to specify the radiative fraction and distribute it to specific surfaces and people. I ensured that all fractions to people and surfaces sum up to unity:
Frac_people + Frac_surfaces = 1
Now: the output variables for the baseboard heating indicate the total electric consumed power, which is the same as the sum of the convective and the radiative fraction. As indicated in the input/output reference, the total heating rate should also be the sum of the two and with an efficiency of 1 equal to the electric power.
Baseboard Electricity Rate = Baseboard Total Heating Rate / Efficiency
Baseboard Total Heating Rate = Baseboard Convective Heating Rate + Baseboard Radiant Heating Rate
However, for me the output of the baseboard total heating rate is equal to the convective part only, leaving out the radiant fraction and is therefore also lower than the electric power. The result is, that the settling temperature stays below the actual scheduled set point.
I investigated the energy balance at the zone surface inside face and also here the radiative part is equal to zero, which means that no radiation seem to reach the wall.
I also tried changing the radiative fraction, which only changed the indicated radiative power, but did not have an effect on the total value. Only in the case of Frac_rad=0 the overall balance seem to add up and the target temperature was met.
Does anyone know, where I could have made a mistake? I can't find one anymore and start to believe that this is an issue in the source code of energyplus itself.
Many thanks in advance - I am happy to provide more information if needed!
Unfortunately I am new here and can not upload any files yet?! :/
