It might be explained by the plant loop capacitance model. You can control the magnitude of storage capacitance in the input field called Plant Loop Volume in the PlantLoop object.
These output variables are useful to investigate:
Plant Demand Side Inlet Lumped Capacitance Temperature
Plant Supply Side Inlet Lumped Capacitance Temperature
From: EnergyPlus_Support@xxxxxxxxxxxxxxx [mailto:EnergyPlus_Support@xxxxxxxxxxxxxxx] On Behalf Of marko.ignjatovic1980
Sent: Wednesday, December 19, 2012 5:54 AM
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Subject: [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 likel
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