I do not know why you wanted to do a step response test, and I am not sure how you are applying the values.
The weather file data is in one hour steps, and interpolated during simulation. A step applied using the weather file may not produce a step in simulation..
The indoor temperature is usually lagging the ODT because of the surface convection/conduction delay, thermo-mass calculation delay and floor ground cooling.
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: energyplus_problem@xxxxxxxxx
Date: Mon, 18 Apr 2011 09:48:04 +0000
Subject: [EnergyPlus_Support] Step response of model
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Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: energyplus_problem@xxxxxxxxx
Date: Mon, 18 Apr 2011 09:48:04 +0000
Subject: [EnergyPlus_Support] Step response of model
Hello everyone
We now have successfully modelled a two story house with basement and are now trying to get a step response out of it. What we did is we have produced a weather file that suddenly changes from 0 to a higher temperature (ground temperature as well) with all other variables equal to zero and have our building simulated with it. There is no AC in our house, but the response shows that the house will never reach the outdoor temperature, but stays steady some degrees below it. For example, if the step is from 0 to 50 degrees celsius, the mean temperature within the house stays at around 44 degrees.
Does someone have an explanation for this phenomena? Maybe because the algorithms (DOE-2 outdoors and TARP inside) are not fitted for such a theoretical problem?
Thanks, Jan
We now have successfully modelled a two story house with basement and are now trying to get a step response out of it. What we did is we have produced a weather file that suddenly changes from 0 to a higher temperature (ground temperature as well) with all other variables equal to zero and have our building simulated with it. There is no AC in our house, but the response shows that the house will never reach the outdoor temperature, but stays steady some degrees below it. For example, if the step is from 0 to 50 degrees celsius, the mean temperature within the house stays at around 44 degrees.
Does someone have an explanation for this phenomena? Maybe because the algorithms (DOE-2 outdoors and TARP inside) are not fitted for such a theoretical problem?
Thanks, Jan
__._,_.___
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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