Without the IDF I can only make guesses. My guess is that you were looking at the temperature of the baseboard heater when it is not in use.
The baseboard heater is a zone equipment. when the water is not flowing, it follows the temperature of the zone.
To verify, compare the value with the zone mean air temperature.
Be very careful in your measurements. EPlus is demand and schedule driven. To compare the plant or system simulated results with these measured on a real equipment, the demand must be known and kept repeated to match that of the real weather when the measurements are carried out. This is not a simple project and have many problems that is at PhD level of investigation. Many user on this forum could not find the correct procedures to tackle this type of problems.
What do you need to measure in order to define the demand of the real building and the capacity of the equipment?
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: marko.ignjatovic1980@xxxxxxxxx
Date: Wed, 19 Dec 2012 12:53:40 +0000
Subject: [EnergyPlus_Support] Baseboard heater water inlet temperature higher than central boiler outlet
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Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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The baseboard heater is a zone equipment. when the water is not flowing, it follows the temperature of the zone.
To verify, compare the value with the zone mean air temperature.
Be very careful in your measurements. EPlus is demand and schedule driven. To compare the plant or system simulated results with these measured on a real equipment, the demand must be known and kept repeated to match that of the real weather when the measurements are carried out. This is not a simple project and have many problems that is at PhD level of investigation. Many user on this forum could not find the correct procedures to tackle this type of problems.
What do you need to measure in order to define the demand of the real building and the capacity of the equipment?
Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: marko.ignjatovic1980@xxxxxxxxx
Date: Wed, 19 Dec 2012 12:53:40 +0000
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 likely part of my PhD), and just checking things before any investments are made.
Thanks in advance
Marko
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
__._,_.___
Primary EnergyPlus support is found at:
http://energyplus.helpserve.com or send a message to energyplus-support@xxxxxxxx
The primary EnergyPlus web site is found at:
http://www.energyplus.gov
The group web site is:
http://groups.yahoo.com/group/EnergyPlus_Support/
Attachments are currently allowed but be mindful that not everyone has a high speed connection. Limit attachments to small files.
EnergyPlus Documentation is searchable. Open EPlusMainMenu.pdf under the Documentation link and press the "search" button.
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