EnergyPlus V8.2.0 Release
Posted by Michael J. Witte on 01 October 2014 12:00 AM

The U.S. Department of Energy (DOE) has released EnergyPlus V8.2.0, the first release of EnergyPlus built on C++ source code.  New feature highlights are listed below.  For more information about EnergyPlus, please visit

Installers and source code for V8.2.0 are available at

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Update on EnergyPlus Releases
Posted by Michael J. Witte on 23 April 2014 05:16 PM

For the past several years there have been two annual releases of DOE’s energy simulation engine EnergyPlus, in April and October. In 2014, we are skipping the April release. EnergyPlus has recently been translated from FORTRAN to C++ (see announcement at, and additional time was needed to complete the

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EnergyPlus 8.1 Updated
Posted by Edwin Lee on 24 January 2014 04:22 PM

EnergyPlus Helpdesk Subscribers:

The EnergyPlus Development Team has released an updated version of EnergyPlus 8.1.  The new build (009) features bug fixes that were addressed in the period following the original October 2013 release of 8.1.  If you are using EP-Launch, the tool should also inform you of the available update shortly.  The download is available at the EnergyPlus home page (


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ASHRAE Design Conditions posted on EnergyPlus helpdesk
Posted by Linda Lawrie on 27 November 2012 03:24 PM

EnergyPlus SizingPeriod:Designday object definitions have been posted on the EnergyPlus helpdesk.

The ASHRAE Handbook of Fundamentals specifies design conditions for 5500+ locations.  These zip files have "macro defined" sets for each in EnergyPlus V7.1 (and later) format. Included in the articles are the "keys" to finding the location in the larger .imf files.

Climatic Design Conditions are discussed in the ASHRAE Handbook of Fundamentals, Chapter 14, 2009

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Important Weather Converter files missing from install
Posted by Linda Lawrie on 09 June 2012 04:32 PM

Two important files missing from the install for the weather converter program.  Without them, the full set of statistics will not be produced.

Download and instructions:


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Multiple version update programs posted for all platforms.
Posted by Linda Lawrie on 05 June 2012 11:32 PM

Attachments to three knowledgebase articles allow you to download the multiple version programs to convert your older IDFs to current release (or any release in between).

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