I am just guessing the definition in general.
'Rate' has no direction and is therefore always positive.
To: energyplus_support@xxxxxxxxxxxxxxx
From: yxue2011@xxxxxxxxx
Date: Tue, 30 Oct 2012 12:22:17 -0700
Subject: [EnergyPlus_Support] Zone Air Balance Surface Convection Rate VS Surface Inside Face Convection Heat Gain Rate
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'Rate' has no direction and is therefore always positive.
Gain from the surface to the zone, can be gain or loss, depending on the temperature difference. EPlus sometime uses sign and do not have a choice for 'loss'.
If the North wall has a lower surface temperature, the transfer would be from the zone to the surface.
TARP changes the coefficient value dependent on the transfer direction and the temperature on the other side of the wall , and may result in a small difference in value.
By looking at the values on the other walls may confirm the above statements. I have not ran your IDF yet. For this type of studies, you need to compare more surfaces in a zone. (minimum two out of three different conditions to confirm.)
Dr. Li
To: energyplus_support@xxxxxxxxxxxxxxx
From: yxue2011@xxxxxxxxx
Date: Tue, 30 Oct 2012 12:22:17 -0700
Subject: [EnergyPlus_Support] Zone Air Balance Surface Convection Rate VS Surface Inside Face Convection Heat Gain Rate
Dear All
I'm struggling with the comparison results of the variables "Zone Air Balance Surface Convection Rate" and "Surface Inside Face Convection Heat Gain Rate". According to the definition of the inputoutputreference, they both mean the heat transfer from surface to zone air. I think the sum of all surface inside convection heat gain rate should be equal to zone air balance surface convection rate, especially for a steady simulation.
Recently, I did the steady simulation for a building with 5 zones and check surface convection variables for north zone. However, the sum of "Surface Inside Face Convection Heat Gain Rate" for all North Zone surfaces equals +8125 and the "Zone Air Balance Surface Convection Rate" equals -8136. Although the absolute value of them are similar but why with different signs (one is negative and the other is positive)? Did I misunderstand something? I attached the idf file with output of the two variables, could anybody give me the answer? Thank you very much.
Yan
I'm struggling with the comparison results of the variables "Zone Air Balance Surface Convection Rate" and "Surface Inside Face Convection Heat Gain Rate". According to the definition of the inputoutputreference, they both mean the heat transfer from surface to zone air. I think the sum of all surface inside convection heat gain rate should be equal to zone air balance surface convection rate, especially for a steady simulation.
Recently, I did the steady simulation for a building with 5 zones and check surface convection variables for north zone. However, the sum of "Surface Inside Face Convection Heat Gain Rate" for all North Zone surfaces equals +8125 and the "Zone Air Balance Surface Convection Rate" equals -8136. Although the absolute value of them are similar but why with different signs (one is negative and the other is positive)? Did I misunderstand something? I attached the idf file with output of the two variables, could anybody give me the answer? Thank you very much.
Yan
__._,_.___
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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