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Re: [EnergyPlus_Support] EarthTube
Hard to tell, but let's try:
It could be a result of the time step management in E+. Make sure you are reporting E+ at every time step, not just every hour. If the earth tube is just on for a few minutes at the beginning of an hour, E+ will average this over the entire hour and report some small value. Could this be the problem?
Edwin
----- Original Message ----
From: y <fly_bird@xxxxxxxxxxxxxxx>
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
Sent: Monday, December 24, 2007 9:10:34 AM
Subject: [EnergyPlus_Support] EarthTube
Dear Sir or Madamï¼?
I have a question when I used EnergyPlus: EarthTube model. As I
know, the EarthTubeFlowRate calculation equation is
E*F*(A+B*(delta T)+C(Windspeed) +D(Windspeed^ 2)),
where F depends on the setting in Schedule. I simulated one case of
one year (8760 hrs) with Earthtube model and set some values that are
equal zero in the Schedule by using Schedule:File: Comma. When I check
the output file, I thought the output of EarthTube-Volume should be
zero when the values in the schedule (F=0) are set to be zero.
Although the equation tells us F=0, then FlowRate=0, but the output
results didn't show that way. It becomes that F values are equal to
zero and the EarthTube-Volume has certain values, which are not
necessarily equal to zero. I am very confused about this setting.
I would appreciate some comments on this setting that causes
difference from what we expected and why it shows this kind of
outputs. Thank you.
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