There are several reasons. One of them is below:
The output variable may give an averaged value of the preceding hourly period as the output listing.
==============
Four your epw case:
When you simulate in time steps of more than 1, and list in timesteps, the ODT value at the hour is normally not changed significantly. ( epw ODT has only one decimal place.)
If you simulate in time steps of more than one and then list in hourly steps, the listed hourly value is averaged, and is the averaged value of the two adjacent values in the hourly epw data.
===============
The averaging can happen on other output variables as well.
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: lisa.ng@xxxxxxxx
Date: Thu, 7 Apr 2011 13:52:02 +0000
Subject: [EnergyPlus_Support] EPW values different than E+ output of weather data
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Primary EnergyPlus support is found at:
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The primary EnergyPlus web site is found at:
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Dr. Li
To: EnergyPlus_Support@xxxxxxxxxxxxxxx
From: lisa.ng@xxxxxxxx
Date: Thu, 7 Apr 2011 13:52:02 +0000
Subject: [EnergyPlus_Support] EPW values different than E+ output of weather data
Hello everyone,
I've opened the EPW file and the E+ output:variables CSV file to compare. I've noticed that the temperatures, wind speed, etc. (outdoor data) are different. Can someone tell me why? THANKS!
Lisa
I've opened the EPW file and the E+ output:variables CSV file to compare. I've noticed that the temperatures, wind speed, etc. (outdoor data) are different. Can someone tell me why? THANKS!
Lisa
__._,_.___
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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