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[EnergyPlus_Support] Baseboard heater water inlet temperature higher than central boiler outlet

Dear All,

I am modelling real building with hydronic heating system (radiators) using baseboardheater:water:convective objects. I followed the steps from engineering reference and entered manufacturer data where existed in the model. I also put control on the boiler in order to follow outdoor conditions.
When I double checked variables in output I found that from 7 AM until app. 3 PM baseboard water inlet temperature is higher that the supply temperature (this is the case also when the heating system stops from 11 PM to 7 AM but it doesn't mater since there is no flow). After this period until 11 PM is lower. All pipes in the model were adiabatic. 

Where does this increase come from? 

If anyone needs clarifications I can e-mail *.IDF (although some names are in my native language).

I am asking this because I want to calibrate this model to real measurements (most likely part of my PhD), and just checking things before any investments are made.

Thanks in advance

Marko




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