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<h1><img src="favicon.png" alt="EnergyPlus Logo" width="98" height="98"> EnergyPlus</h1>
<p>
Version 9.3.0<br>
31 March 2020<br>
<em>EnergyPlus is a trademark of the US Department of Energy.</em>
</p>
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<div class="col-md-8 text-center">
EnergyPlus is a simulation program designed for modeling buildings with all their associated
heating, cooling, lighting, ventilating, and other energy flows. EnergyPlus is a stand-alone simulation engine
without a ‘user friendly’ graphical interface. EnergyPlus reads input and writes output as text files...
<hr>
...<b>although</b>, as of 9.3, EnergyPlus is starting to become a library.
</div>
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</div>
<div class="container">
<div class="row">
<div class="col-md-12" style="text-align:center;">
<a class="btn btn-primary margin-bottom-6" href="https://energyplus.net" role="button">
<span class="fa fa-external-link"></span> Go to the EnergyPlus Website
</a>
</div>
</div>
<div class="row">
<div class="col-md-12" style="text-align:center;">
<a class="btn btn-primary margin-bottom-6" href="https://energyplus.net/quickstart" role="button">
<span class="fa fa-external-link"></span> Go to the EnergyPlus Quick-Start Guide
</a>
</div>
</div>
<h2>Using EnergyPlus</h2>
<p>
Utilities and tools for creating, editing, and running input files that come with EnergyPlus include IDF Editor
and
EP-Launch. Many graphical user interfaces for EnergyPlus are available or under development. For the latest
tools,
please see
<a href="https://www.buildingenergysoftwaretools.com/?capabilities=Whole-building+Energy+Simulation&keywords=EnergyPlus">
this website for third party interfaces</a>. A completely new cross-platform version of EP-Launch has been
developed
and is available separate from the EnergyPlus install; see the <a
href="https://ep-launch.readthedocs.io/en/latest/intro.html#ep-launch">documentation</a> for more
information.
Some tools may produce out of date IDF files; you can then use the IDFVersionUpdater program to convert older
files to current EnergyPlus version (you may need to use the Multiple Version Conversions set – see below).
</p>
<h2><a id="Whats_going_on"></a>What’s going on in V9.3?</h2>
<div class="row">
<div class="col-md-12">
<a class="btn btn-primary margin-bottom-6" data-toggle="collapse" href="#cDifferent" role="button"
aria-expanded="false"
aria-controls="cDifferent">
Is 9.3 different from 9.2? (Wait, did you say EnergyPlus is a library?)
</a>
<div class="collapse" id="cDifferent">
<div class="card card-body">
<h5 class="card-title">Yes... and no.</h5>
<p class="card-text">
Put a pin in that library question for a moment. For a majority of users, EnergyPlus is still
basically the same tool, but with some great new features, bug fixes, and runtime performance
improvements. Running EnergyPlus can still be accomplished the same way, by creating an input
file in IDF or EpJSON syntax, running the EnergyPlus(.exe) binary, and gathering results of
interest. All this power is still available. 👍 <br>
However, for advanced usage, there are two significant changes that should be noted. The first
is that user-defined EMS scripts can now be written as Python "plugins" that are executed by
EnergyPlus at runtime. The second is that EnergyPlus can now be treated as a library, where a
client can make function calls to setup and execute a simulation, as well as interact with
simulation results <b>during</b> a simulation. 👍 👍 👍<br>
Details of these major changes along with other significant features for this version (hint:
there are a bunch!) are listed below in this readme. Also, see the full
<a href="https://github.com/NREL/EnergyPlus/releases/latest" class="card-link">ChangeLog</a>
for a complete list of new features added in this and previous versions.
</p>
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<a class="btn btn-primary margin-bottom-6" data-toggle="collapse" href="#collapseIDDIDF" role="button"
aria-expanded="false"
aria-controls="collapseIDDIDF">
Are 9.3 and 9.2 IDD and IDF files the same?
</a>
<div class="collapse" id="collapseIDDIDF">
<div class="card card-body">
<h5 class="card-title">No, they are different</h5>
<p class="card-text">There are a few key changes in the V9.3 IDD. For best results, use the transition program to
transfer from the earlier V9.2 files. Use the IDFVersionUpdater program for best results.</p>
</div>
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</div>
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<a class="btn btn-primary margin-bottom-6" data-toggle="collapse" href="#collapseCompatible" role="button"
aria-expanded="false"
aria-controls="collapseCompatible">
Is version 9.3 backward compatible? Can I run v9.2 file in v9.3?
</a>
<div class="collapse" id="collapseCompatible">
<div class="card card-body">
<h5 class="card-title">Some objects require transition</h5>
There have been changes in the following objects which require conversion. Either read and follow
the Rules document or use the IDFVersionUpdater utility. The “Rules” document contains information on
exact object changes that you can do by hand. The updater program is described more fully in the Auxiliary
Programs document. For the v9.3 release, the following objects require conversion (from V9.2):
<ul class="list-group">
<li class="list-group-item transition-object-name">AirConditioner:VariableRefrigerantFlow</li>
<li class="list-group-item transition-object-name">AirTerminal:SingleDuct:Uncontrolled <i>(spoiler...it's gone!)</i></li>
<li class="list-group-item transition-object-name">Boiler:HotWater</li>
<li class="list-group-item transition-object-name">Boiler:Steam</li>
<li class="list-group-item transition-object-name">Chiller:EngineDriven</li>
<li class="list-group-item transition-object-name">Chiller:CombustionTurbine</li>
<li class="list-group-item transition-object-name">ChillerHeater:Absorption:DirectFired</li>
<li class="list-group-item transition-object-name">Coil:Cooling:DX:MultiSpeed</li>
<li class="list-group-item transition-object-name">Coil:Heating:Fuel</li>
<li class="list-group-item transition-object-name">Coil:Heating:DX:MultiSpeed</li>
<li class="list-group-item transition-object-name">EnergyManagementSystem:Program</li>
<li class="list-group-item transition-object-name">EnergyManagementSystem:Subroutine</li>
<li class="list-group-item transition-object-name">EnergyManagementSystem:MeteredOutputVariable</li>
<li class="list-group-item transition-object-name">Exterior:FuelEquipment</li>
<li class="list-group-item transition-object-name">FuelFactors</li>
<li class="list-group-item transition-object-name">Generator:CombustionTurbine</li>
<li class="list-group-item transition-object-name">Generator:InternalCombustionEngine</li>
<li class="list-group-item transition-object-name">Generator:MicroTurbine</li>
<li class="list-group-item transition-object-name">GlobalGeometryRules</li>
<li class="list-group-item transition-object-name">HeatPump:WaterToWater:EIR:Heating</li>
<li class="list-group-item transition-object-name">HeatPump:WaterToWater:EIR:Cooling</li>
<li class="list-group-item transition-object-name">HVACTemplate:System:VRF</li>
<li class="list-group-item transition-object-name">HVACTemplate:Plant:Boiler</li>
<li class="list-group-item transition-object-name">LifeCycleCost:UsePriceEscalation</li>
<li class="list-group-item transition-object-name">LifeCycleCost:UseAdjustment</li>
<li class="list-group-item transition-object-name">OtherEquipment</li>
<li class="list-group-item transition-object-name">Output:Table:SummaryReports</li>
<li class="list-group-item transition-object-name">ShadowCalculation</li>
<li class="list-group-item transition-object-name">WaterHeater:Mixed</li>
<li class="list-group-item transition-object-name">WaterHeater:Stratified</li>
<li class="list-group-item transition-object-name">ZoneHVAC:HybridUnitaryHVAC</li>
</ul>
</div>
</div>
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<a class="btn btn-primary margin-bottom-6" data-toggle="collapse" href="#collapseInputCheck" role="button"
aria-expanded="false"
aria-controls="collapseInputCheck">
Will my updated file definitely work?
</a>
<div class="collapse" id="collapseInputCheck">
<div class="card card-body">
<h5 class="card-title">No, not definitely</h5>
With every EnergyPlus release, there are new checks on user input. Even if your file ran in an
earlier version, it may not run in the newer version after conversion due to newer checks on the
validity of input.
</div>
</div>
</div>
</div>
<h2><a id="Multiple_Version_Conversions_51"></a>Multiple Version Conversions</h2>
<p>
The install includes the IDFVersionUpdater program and the necessary programs to convert from the previous
version (including .rvi and .mvi files) to the current version. The install also includes the necessary programs
to convert from older versions back to v7.2.0. For versions older than v7.2.0, you will need to visit the
helpdesk and download the multiple conversion set of programs. The helpdesk downloads area:
<a href="http://energyplus.helpserve.com/Knowledgebase/List/Index/46/converting-older-version-files">
Converting Older Files</a>
will contain the necessary readmes and zip/tar files of programs to convert IDFs from V1.0 to
the current version.
</p>
<h2><a id="Documentation_55"></a>Documentation</h2>
<p>
The EnergyPlus documentation is included in pdf form in the installer. The pdfs are also available <a
href="https://energyplus.net/documentation">online</a>. For <strong>new users</strong> of EnergyPlus, a
guide called the EnergyPlus Essentials was developed and is available with the installed pdf documentation.
Big Ladder Software is also hosting html versions of the
EnergyPlus Documentation <a href="http://bigladdersoftware.com/epx/docs/">online</a>.
</p>
<p>There are some other documents of interest available on the EnergyPlus web site including:</p>
<div class="list-group">
<a href="https://energyplus.net/quickstart" class="list-group-item list-group-item-action">An EnergyPlus
QuickStart Guide</a>
<a href="https://energyplus.net/testing" class="list-group-item list-group-item-action">Testing and Validation
Reports</a>
</div>
<h2><a id="Weather_Data_63"></a>Weather Data</h2>
<p>A small subset of weather files that are available on the web site are also installed in the WeatherData folder.
EnergyPlus uses these files directly for annual simulations. The Weather Converter program that is part of
EnergyPlus can read these weather files and provide .csv (comma separated variable) as well as statistics
reports
about the included (or other) files. Weather data for more than 2100 locations in more than 100 countries can be
downloaded on the <a href="https://energyplus.net/weather">EnergyPlus Weather Page</a>.</p>
<h2>Important Changes (OK, back to this library thing...)</h2>
<p>There are three changes in this release of EnergyPlus which rely on different software dependencies.</p>
<dl>
<dt>C/Python API</dt>
<dd>
A significant change to this release is the ability to call EnergyPlus as a library. Up until now, the way almost all
users interacted with EnergyPlus has always been to setup an input file, and call the EnergyPlus(.exe) binary to run
the file, then gather results as needed from output files. (ExternalInterface being one exception).
While this traditional method is still available, a new approach has been
added. The simulation code has been refactored to allow a C API to be created, exposing functions that enable users
to register callback functions, call functional methods and interact with the simulation state. Through this C API,
a user may create a small C program that includes a callback function registered for each time step. Then at each
time step, this callback function then evaluates fluid property methods also via the API. The function can also
get access to instantaneous variable and meter data in the running simulation, and modify subsequent time steps
by actuating controls and other aspects. This unlocks the door for a whole new set of possible workflows.
To link against this API, just point builds to the EnergyPlus install directory, which has a new "includes"
directory with headers, and the EnergyPlus DLL right in the install root.
Then, on top of the C API, a matching Python API was built that will allow this same functionality, but through
Python scripts, further reducing the burden needed to create a workflow on top of EnergyPlus. The functional
API that exposes fluid property methods will be expanded over time to allow more and more access to internal
calculations in EnergyPlus. To link against this API, just point scripts into the EnergyPlus install directory
and access API files from the pyenergyplus package in there. More information about the API will be provided in
a supplemental documentation source -- initially a PDF -- posted on the release page on GitHub.
<b>Note that the API is in a preliminary state and is subject to break for the next release. Subsequent
releases will be more stable.</b>
</dd>
<dt>Python Plugins (Python EMS)</dt>
<dd>
The next change is the ability to use Python to write EMS scripts. These scripts are currently nicknamed
"plugins", as they are actually quite similar to the design of plugins for other software tools. In these
scripts, the user will write custom Python classes that override a predefined EnergyPlusPlugin base class.
The user will then declare the plugin in their input file, along with some other plugin-related inputs
(variables that can be shared between plugins, custom output variables, etc.).
Based on which functions the user overrides, the functions will be called at specific points during a
simulation. The calling points are the same as those exposed for regular EMS functions.
Once inside the called function, the plugin can then leverage the Python API discussed in the
previous paragraph to read data, write actuators, and evaluate fluid/refrigerant properties. In order to
execute Python scripts at runtime, this EnergyPlus version includes a Python library with it, which can be seen
if the install package is inspected. Users should not need to mess around with this; this note is merely a tip
for power users or people who do unusual things with the install package, that they need to watch this closer.
Details about this new Python Plugin approach are found in the EMSApplicationGuide, InputOutputReference, and
in the example files named PythonPlugin*.idf.
</dd>
<dt>GPU Calculations</dt>
<dd>
Another high impact change with this release is the ability to leverage GPU calculations to improve runtime
performance of the simulation. The documentation contains plenty of information to let users take
advantage of this new feature, which has the potential to drastically speed up simulation runtime, however,
a few notes provide high level tips for this new capability:
<ul class="list-group">
<li class="list-group-item">
There is a performance overhead associated with passing calculations between the GPU and the CPU, with the
GPU becoming noticeably more efficient in models with more than around 200 shadow-casting surfaces. The
actual number where the GPU becomes more efficient will depend on the specs of the respective hardware.
</li>
<li class="list-group-item">
Some machines (mostly server machines) do not have GPU hardware or the required graphics drivers to utilize
this capability. If this scenario is detected on a computer, EnergyPlus will issue a warning and proceed
with the simulation using the calculations on the CPU.
</li>
<li class="list-group-item">
Some computers have multiple GPUs. In this case, the highest performance GPU is not always used by default.
You may want to select which GPU is used when running EnergyPlus by setting the graphics performance
preferences on your computer.
</li>
</ul>
</dd>
</dl>
<h2>Highlights of this release (V9.3.0)</h2>
<h3><a id="Highlights_of_this_release"></a>New Features</h3>
<table class="table table-striped table-bordered">
<tr>
<th>PR #</th>
<th>Description</th>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7489">7489</a></td>
<td>Extend EIR WWHP to Air-source</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7562">7562</a></td>
<td>Add Three Alternative Models for Clear Sky Emissivity Calculation</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7603">7603</a></td>
<td>Input file conversion utility IDF->epJSON and reverse</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7605">7605</a></td>
<td>Allow ZoneHVAC:TerminalUnit:VariableRefrigerantFlow to connect to AirloopHVAC and AirLoopHVAC:OutdoorAirSystem:EquipmentList</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7643">7643</a></td>
<td>New Schedule for Minimum Airflow for VAV Boxes</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7776">7776</a></td>
<td>C API, Python API, and Python Plugins</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7792">7792</a></td>
<td>DX Cooling Coil Refactor</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7834">7834</a></td>
<td>Scheduling min air flow for vav boxes follow up</td>
</tr>
</table>
<h3><a id="PerformanceFeatures"></a>Runtime Performance Enhancing Developments</h3>
<table class="table table-striped table-bordered">
<tr>
<th>PR #</th>
<th>Description</th>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7302">7302</a></td>
<td>Allow GPU-based shading calculations</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7534">7534</a></td>
<td>Implement Carroll method for Interior Radiant Heat Exchange</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7567">7567</a></td>
<td>Sizing speed up related to reducing the number of warmup days for design days</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7574">7574</a></td>
<td>A new algorithm for polygon clipping in solar calculations for rectangular surfaces</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7761">7761</a></td>
<td>Add Performance Overrides and Reporting</td>
</tr>
</table>
<h3><a id="RefactoringEfforts"></a>Targeted Refactoring Efforts</h3>
<table class="table table-striped table-bordered">
<tr>
<th>PR #</th>
<th>Description</th>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7479">7479</a></td>
<td>Simplify the moist air specific heat capacity psychrometric function</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7668">7668</a></td>
<td>Begin removing objexx gio (a total of 5 different PRs)</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7734">7734</a></td>
<td>Make HeatPump:* Output Variable Names Consistent</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7772">7772</a></td>
<td>Redefine Trim* and Round* functions in terms of {fmt}</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7813">7813</a></td>
<td>Reduce use of Array1S objects</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7825">7825</a></td>
<td>Make EnergyPlus suitable as a cmake subproject</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7840">7840</a></td>
<td>Eliminating Reference variables</td>
</tr>
<tr>
<td><a href="https://github.com/NREL/EnergyPlus/pull/7841">7841</a></td>
<td>Reduce Array1A and Array1 usage</td>
</tr>
<tr>
<td></td>
<td>(~30 different PRs) Refactoring plant models into a uniform PlantComponent interface base class</td>
</tr>
</table>
<div class="row">
<div class="col-md-2"></div>
<div class="col-md-8">
<blockquote class="blockquote text-center">
<p class="mb-0">
<b>A complete list of addressed issues may be found in the installed <a href="changelog.html" >changelog</a>.</b>
</p>
</blockquote>
</div>
<div class="col-md-2"></div>
</div>
<h2><a id="Platforms_90"></a>Platforms</h2>
<ul class="list-group">
<li class="list-group-item">Windows 7, 8 & 10</li>
<li class="list-group-item">Linux (Ubuntu 18.04 and compatible) 64 bit versions</li>
<li class="list-group-item">Mac OSX 10.13 64 bit versions</li>
<li class="list-group-item">EnergyPlus V9.3 has been tested on all of these platforms</li>
<li class="list-group-item"><em>EnergyPlus does intensive computations, and based on configuration, can write
massive amounts of data to
disk. For best performance, computers should have a substantial amount of memory and high speed hard
drives.</em>
</li>
</ul>
<h2><a id="Installation_contents_100"></a>Installation contents</h2>
<p>The installation creates a program folder with icons/shortcuts for the programs/files in EnergyPlus that can be
accessed from Windows menus, including removing EnergyPlus from your system. In Windows OS, these will be
available from the “Programs” area in the Start Menu. Note that only a few of the programs will store anything
in your Windows\System directory (IDFEditor, EPLaunch, WeatherConverter).</p>
<h2><a id="Known_problems_104"></a>Known problems</h2>
<p>While every effort has been made to clean up all the “defects” that have occurred during our testing, quite a few
known (and even more unknown) probably remain. Specifics on the remaining known problems can be found on the
GitHub repository <a href="https://github.com/NREL/EnergyPlus/issues">issues page</a>. If you are interested in
what has been addressed, the issues resolved in this release are installed similarly in the
<a href="changelog.html">changelog</a>.
</p>
<h2>Additional steps you may want to consider:</h2>
<ol>
<li>
<p>Download additional <a href="https://energyplus.net/weather">Weather Data</a> for use in running example
files or your files.</p>
</li>
<li>
<p>The <a href="https://unmethours.com/questions/">UnmetHours</a> forum allows users to search for answers,
ask new questions about
their building simulation models to other users, and generally get quick feedback. Members of the
EnergyPlus
development team are also on the forum answering when possible.
</p>
</li>
<li>
<p>The EnergyPlus helpdesk (<a href="http://energyplus.helpserve.com">energyplus.helpserve.com</a>)
requires a login via self-registration or via sending a problem/question to the
email address
<a href="mailto:[email protected]">[email protected]</a>. In addition to having
support tickets and responses from helpdesk personnel, there are knowledgebase articles and a download area.</p>
</li> <li>
<p>BLDG-SIM: A free e-mail list for all building energy simulation program users to ask general building simulation questions to other
users and to post announcements (for events, training, job postings, etc.).
See <a href="http://lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org">lists.onebuilding.org/listinfo.cgi/bldg-sim-onebuilding.org</a>
for information on joining this email list.</p>
</li>
<li>
<p>Open-Source License (or distribution license): Licenses for the source code and distribution are
available
from the website: <a href="https://energyplus.net/licensing">Licensing Info</a></p>
</li>
</ol>
<p>If you have any other questions, contact <a href="mailto:[email protected]">EnergyPlus Support</a>.</p>
<hr>
<div class="row">
<div class="col-md-2"></div>
<div class="col-md-8">
<blockquote class="blockquote text-center">
<p class="mb-0">
Thanks for downloading EnergyPlus.
Special thanks to our beta testers for this release.
If you did not download the previous version, we welcome you.
If you are a returning customer, we hope you find the latest release exceeding your expectations.
We look forward to serving you!
</p>
<footer class="blockquote-footer">EnergyPlus Development, Testing, and Support Team</footer>
</blockquote>
</div>
<div class="col-md-2"></div>
</div>
<hr>
<footer>
<p>Copyright © 1996-2020 The Board of Trustees of the University of Illinois, The Regents of the University of
California through Ernest Orlando Lawrence Berkeley National Laboratory, Oak Ridge National Laboratory,
managed
by
UT-Battelle, Alliance for Sustainable Energy, LLC, and other contributors. All rights reserved.</p>
<p>Other Notices and Acknowledgments are found in the <a
href="Documentation/Acknowledgments.pdf">Acknowledgments</a>
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